JP2002097334A - Resin composition, lighting fixture for vehicle using the same and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin for lamp bodies for lighting fixture vehicle, capable of improving threading phenomenon of the resin constituting a lamp body caused when producing lighting fixture by joining the lamp body to lamp lens by a melting method by a hot plate and gloss of vacuum metallizing surface. SOLUTION: This thermoplastic resin composition is obtained by compounding a rubber-reinforced styrene-based resin consisting essentially of a graft copolymer of a specific rubber having a small particle diameter with a polycarbonate resin or a saturated polyester resin or further compounding the above compound with an antistatic agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition for molding a vehicle lamp, a lamp body formed by molding the same, a vehicle lamp such as a reflector, and a method of fusing these lamps and a lamp lens by hot plate fusion or vibration fusion. The present invention relates to a joined lamp case and the like and a method of manufacturing the same.

[0002]

2. Description of the Related Art As a method for joining a lamp body made of a synthetic resin and a lamp lens, there is also a method of fixing the both with an adhesive, but a hot plate is pressed against a lamp body made of a thermoplastic resin and melted. Later, the so-called hot plate fusion method, in which the molten portion is pressed against a lamp lens made of methyl methacrylate resin or the like, has been increasingly adopted from the viewpoint of cost reduction and improvement of the working environment by not using a solvent at all. . However, in such a hot plate fusion method, after the thermoplastic resin constituting the lamp body is melted by the hot plate, when the hot plate is separated, the molten resin is stretched in a thread shape (hereinafter, this phenomenon is referred to as " This phenomenon is referred to as a "stringing" phenomenon.) When this adheres to the surface of a molded article of a vehicle lamp, such as a lamp lens or a lamp pod, there is a case where a defect such as poor appearance occurs. As a method for improving the stringing phenomenon in the hot plate fusion method, for example, Japanese Patent Application Laid-Open No. 9-12 / 1990
Japanese Patent Publication No. 902 proposes a method of adding a fluororesin such as polytetrafluoroethylene to a thermoplastic resin such as a polycarbonate resin or an ABS resin and molding the resultant into a lamp such as a lamp body.

[0003] In addition, the inner surface of a molded lamp body of a vehicle lamp and the reflector reflecting surface are subjected to processing such as vapor deposition or sputtering. The surface of the processed molded article is for reflecting the illuminance of the lamp and is required to have high gloss. In general, in order to obtain the above performance, first, a molded article is coated with an undercoat called an undercoat, and then processed such as vapor deposition or sputtering.

[0004] Generally, an undercoating process is performed before the vapor deposition or sputtering process to assist the processability. Recently, there has been a demand to omit this undercoating step and reduce the so-called undercoating for the purpose of cost reduction of products. Currently, 100%
The vehicle lamp body made of polycarbonate resin etc. meets the above gloss standards, but to reduce product cost, improve impact strength, and improve moldability,
When a rubber-reinforced styrene-based resin was introduced, the gloss of the vapor-deposited surface was lowered, which was not satisfactory. JP-A-10-287802 describes that a resin composition comprising a vinyl copolymer containing an aromatic polycarbonate and an acrylate rubber polymer is excellent in processability of vapor deposition and sputtering, but it does not require undercoating. Are not obtained.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the present inventors have constructed a lamp body for manufacturing a vehicle lamp by joining a lamp body to a lamp lens by a hot plate fusion method. Resin stringing is suppressed, and when an inner surface of a molded article of a vehicle lamp lamp body is subjected to a process such as vapor deposition or sputtering, even if the undercoating step is omitted, it is possible to reduce
The present invention has found a molding material and a molding method which exhibit the same surface gloss as a vehicle lamp lamp body obtained by molding a 00% polycarbonate resin and do not cause a decrease in workability of vapor deposition or sputtering.

[0006]

Means for Solving the Problems As a result of intensive studies to achieve the above object, the present inventors have found that a rubber-reinforced styrene-based resin containing a specific small-particle-diameter rubber-containing graft copolymer as an essential component and polycarbonate A resin composition comprising a resin or a saturated polyester resin, or a resin composition in which an antistatic agent is present in a specific ratio with respect to the resin composition is used to join the lamp body and the lamp lens by a hot plate fusion method. Significantly improved threading in the manufacture of vehicular lamps, and when vapor-depositing or sputtering the surface of the lamp body molded product, even if the undercoating step was omitted,
The inventors have found that a vapor-deposited surface satisfying high surface gloss can be obtained, and have reached the present invention.

That is, the present invention relates to (A). (a1) A monomer mixture comprising a total of 100% by weight of 30 to 90% by weight of an aromatic vinyl compound, 10 to 40% by weight of a vinyl cyanide compound, and 0 to 30% by weight of a monomer copolymerizable therewith. 0 to 98 parts by weight of a styrene copolymer having a reduced viscosity (30 ° C., in an N, N-dimethylformamide solution) of 0.3 to 1.2 dl / g, which is obtained by polymerization of methyl ethyl ketone soluble component; ) A diene rubber polymer, an acrylic rubber polymer, a silicone rubber polymer, and at least one rubber polymer selected from olefin rubber polymers having a volume average particle diameter of 60 to 250 nm. A rubber polymer (R
a) Aromatic vinyl compound 10 in the presence of 5 to 90 parts by weight
To 90% by weight, at least one compound of a (meth) acrylate compound and a vinyl cyanide compound
0 to 30% by weight of a total of 100% by weight of a monomer mixture of 10 to 95%
100 to 2 parts by weight of a graft copolymer obtained by polymerizing parts by weight and (a3) at least one selected from a diene rubber polymer, an acrylic rubber polymer, a silicone rubber polymer and an olefin rubber polymer. One kind of rubber polymer having a volume average particle size of 260 to 1000 nm (R
b) Aromatic vinyl compound 1 in the presence of 15 to 90 parts by weight
0-90% by weight, (meth) acrylate compound,
At least one compound of vinyl cyanide compounds
A monomer mixture of 10 to 8 consisting of 90% by weight and a total of 100% by weight of 0 to 30% by weight of monomers copolymerizable therewith;
5 to 30 parts by weight of a graft copolymer obtained by polymerizing 5 parts by weight [100 parts by weight in total of (a1), (a2) and (a3)], and a rubber polymer content of 5 to 30% by weight. 10 to 90 parts by weight of a rubber-reinforced styrene resin, and (B). A volume average of the resin composition for molding vehicle lighting (Claim 1), comprising 90 to 10 parts by weight of a polycarbonate resin or a saturated polyester resin [100 parts by weight in total of (A) and (B)], and a graft copolymer (2). The resin composition according to claim 1, which has a particle diameter of 60 to 150 nm (claim 2), and 0.1 to 5 parts by weight of an antistatic agent per 100 parts by weight of the resin composition according to claim 1. The antistatic resin composition for molding a vehicle (Claim 3), wherein the antistatic agent is an alkane sulfonate, an alkylbenzene sulfonate, a polyalkylene glycol, a polyalkylene glycol-based copolymer or a polyetheresteramide. The antistatic resin composition according to claim 3 (claim 4), and the resin composition according to claim 1 (claim 5), wherein the vehicle lamp is a lamp body. A vehicle lamp formed by molding a product (claim 6), a lamp body formed by molding the resin composition according to claim 1 (claim 7), and a reflector formed by molding the resin composition according to claim 1 (Claim 8) An automobile headlamp case, a turn signal case, a back lamp case or a stop lamp case using the lamp body according to claim 7 (claim 9).
A method for manufacturing a vehicular lamp, characterized in that a heated hot plate is pressed against the lamp body to melt the lamp body, and then the fused part is pressed against a lamp lens to join the lamp body and the lamp lens. 10), hot plate 250-500
The method for manufacturing a vehicle lighting device according to claim 10, wherein the method is performed by heating to a temperature of ° C (claim 11), and the method for manufacturing a vehicle lighting device according to claim 10 or 11, wherein a lens made of methyl methacrylate resin is used as a lamp lens. (12) A vehicular lamp in which a heated hot plate is pressed against the lamp body according to claim 7 to melt it, and then the fused portion is pressed against a lamp lens to join the lamp body and the lamp lens. 13) The vehicle lamp according to claim 13, wherein a lens made of methyl methacrylate resin is used as the lamp lens.
Regarding 4).

[0008]

DETAILED DESCRIPTION OF THE INVENTION Particularly important in the present invention is a specific small particle size rubber-containing graft copolymer (a2) to be added to a resin composition used for molding a vehicle lighting device. The resin composition of the present invention comprises a rubber-reinforced styrene-based resin (A) containing this small-particle-diameter rubber-containing graft copolymer and a polycarbonate resin or a saturated polyester resin (B). Has good workability when performing processing such as vapor deposition or sputtering, has a high gloss on the processed surface, and is a resin that forms the lamp body when manufacturing the lamp case by joining the lamp body to the lamp lens by hot plate fusion. The improvement in the threading property of the product is remarkable. The resin composition of the present invention,
(A). (a1) A monomer mixture comprising a total of 100% by weight of 30 to 90% by weight of an aromatic vinyl compound, 10 to 40% by weight of a vinyl cyanide compound, and 0 to 30% by weight of a monomer copolymerizable therewith. 0 to 98 parts by weight of a styrene copolymer having a reduced viscosity (30 ° C., in an N, N-dimethylformamide solution) of 0.3 to 1.2 dl / g, obtained by polymerization, ) A diene rubber polymer, an acrylic rubber polymer, a silicone rubber polymer, and at least one rubber polymer selected from olefin rubber polymers having a volume average particle diameter of 60 to 250 nm. A rubber polymer (R
a) Aromatic vinyl compound 10 in the presence of 5 to 90 parts by weight
To 90% by weight, at least one compound of a (meth) acrylate compound and a vinyl cyanide compound
0 to 30% by weight of a total of 100% by weight of a monomer mixture of 10 to 95%
100 to 2 parts by weight of a graft copolymer obtained by polymerizing parts by weight and (a3) at least one selected from a diene rubber polymer, an acrylic rubber polymer, a silicone rubber polymer and an olefin rubber polymer. One kind of rubber polymer having a volume average particle size of 260 to 1000 nm (R
b) Aromatic vinyl compound 1 in the presence of 15 to 90 parts by weight
0-90% by weight, (meth) acrylate compound,
At least one compound of vinyl cyanide compounds
A monomer mixture of 10 to 8 consisting of 90% by weight and a total of 100% by weight of 0 to 30% by weight of monomers copolymerizable therewith;
5 to 30 parts by weight of a graft copolymer obtained by polymerizing 5 parts by weight [100 parts by weight in total of (a1), (a2) and (a3)], and a rubber polymer content of 5 to 30% by weight. 10 to 90 parts by weight of a rubber-reinforced styrene resin, and (B). It is composed of 90 to 10 parts by weight of a polycarbonate resin or a saturated polyester resin [100 parts by weight in total of (A) and (B)].

The styrenic copolymer (a1) comprises 10 to 40% by weight of a vinyl cyanide compound and 3
0 to 90% by weight and a monomer copolymerizable therewith
It is obtained by polymerizing 30% by weight of a total of 100% by weight of a monomer, more preferably a vinyl cyanide compound 15 to
37% by weight, 40 to 90% by weight of an aromatic vinyl compound, and 0 to 15% by weight of a monomer copolymerizable therewith.

Examples of the vinyl cyanide compound include acrylonitrile and methacrylonitrile. These can be used alone or in combination of two or more.

The aromatic vinyl compound includes styrene, α-methylstyrene, p-methylstyrene, p-isopropylstyrene, chlorostyrene, bromostyrene and the like.

Examples of the copolymerizable monomer include maleimide, N-methylmaleimide, N-ethylmaleimide, and N-ethylmaleimide.
Maleimide compounds such as -propylmaleimide, N-butylmaleimide, N-phenylmaleimide and N- (p-methylphenyl) maleimide; At least one acrylate having an alkyl group having 1 to 18 carbon atoms such as at least one methacrylate having an alkyl group of 18 to 18, such as methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate and stearyl acrylate; , (Meth) acrylic acid, glycidyl (meth) acrylate, and other (meth) acrylic acid derivatives other than (meth) acrylic acid esters. These are used alone or in combination of two or more.

The reduced viscosity (30 ° C., in N, N-dimethylformamide solution) of the methyl ethyl ketone soluble portion of the styrenic copolymer (a1) is 0.3 to 1.2 dl / g.
More preferably, it is 0.4 to 0.9 dl / g. The volume average particle diameter of the rubber polymer (Ra) in the small particle diameter rubber-containing graft copolymer (a2) is from 60 to 250 nm.
0 nm. If the volume average particle size is less than 60 nm, the impact strength is greatly reduced, and if it exceeds 250 nm, the gloss of the deposition surface is reduced.

The above-mentioned rubber-containing graft copolymer having a medium particle size (a
The volume average particle size of the rubber polymer (Rb) in 3) is 260
It is preferable that the graft copolymer (a3) is not used from the viewpoint of glossiness of the deposition surface. However, to improve the impact, it can be used up to 30 parts by weight,
The amount is preferably 0 to 15 parts by weight from the viewpoint of glossiness of the deposition surface.

The rubber polymers (Ra) and (Rb) include diene rubber polymers such as butadiene rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, butyl acrylate rubber, butadiene-butyl acrylate rubber, and acrylic acid. Acrylic rubber polymers such as 2-ethylhexyl-butyl acrylate rubber, 2-ethylhexyl methacrylate-butyl acrylate rubber, stearyl acrylate-butyl acrylate rubber, dimethylsiloxane-butyl acrylate rubber, silicone / butyl acrylate composite rubber, and ethylene Olefin rubber polymers such as propylene rubber and ethylene-propylene-diene rubber; and silicon rubber polymers such as polydimethylsiloxane rubber. These may be used alone or in combination of two or more.

The monomer mixture in the graft copolymers (a2) and (a3) comprises 10 to 90% by weight of an aromatic vinyl compound, at least one compound of a (meth) acrylate ester and a vinyl cyanide compound. To 90% by weight and 0 to 30% by weight of monomers copolymerizable therewith.

As the aromatic vinyl compound, styrene,
α-methylstyrene, p-methylstyrene, p-isopropylstyrene, chlorostyrene, bromostyrene and the like.

Examples of the vinyl cyanide compound include acrylonitrile and methacrylonitrile. Examples of the (meth) acrylate compound include methacrylate having an alkyl group having 1 to 18 carbon atoms, such as methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, and stearyl methacrylate, methyl acrylate, ethyl acrylate, and butyl acrylate. , 2-ethylhexyl acrylate, stearyl acrylate, etc.
An acrylate having 18 alkyl groups is exemplified.

Other copolymerizable monomers include:
(Meth) acrylic acid derivatives other than (meth) acrylic acid esters such as (meth) acrylic acid and glycidyl (meth) acrylate, and maleimide compounds such as maleimide and N-phenylmaleimide. They are,
One or more kinds may be used.

The rubber-reinforced styrene resin of the present invention has a rubber polymer (Ra) or a total content of (Ra) and (Rb) of 5 to 30% by weight, preferably 5 to 30% by weight in the rubber reinforced styrene resin (A). 25% by weight.

The polycarbonate resin used in the present invention comprises:
Aromatic polycarbonate, aliphatic polycarbonate, aliphatic-aromatic polycarbonate and the like can be mentioned. Generally, 2,2-bis (4-oxyphenyl) alkane, bis (4-oxyphenyl) ether, bis (4-oxyphenyl) sulfone, bis (4-oxyphenyl) sulfide or bis (4-oxy) It is a polymer or copolymer composed of bisphenols such as phenyl) sulfoxide, and also includes a halogen-substituted bisphenol-based polymer as required.

The saturated polyester resin used in the present invention is:
Polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene-1,2-bis (phenoxy) ethane-4,4 "-dicarboxylate, etc., as well as polyethylene isophthalate / terephthalate, poly Copolymerized polyesters such as butylene phthalate / isophthalate, polybutylene terephthalate / decane dicarboxylate, etc. Of these, polyethylene terephthalate and polybutylene terephthalate can be preferably used. More than one kind of resin can be used in combination, and the amount of blending may be appropriately determined in order to obtain desired physical properties. Sulfonate-based resin a large amount of polycarbonate resin is, the chemical resistance improvement purposes, blends of abundant saturated polyester resin, saturated polyester resin is preferable.

The resin composition for molding a vehicle lamp according to the present invention comprises the rubber-reinforced styrene resin (A) 10 to 90 as described above.
Parts by weight, more preferably 20 to 80 parts by weight, 90 to 10 parts by weight of one or two kinds of resins (B) selected from polycarbonate resins and saturated polyester resins, more preferably 80 to 20 parts by weight [(A ) And (B) in total 100 parts by weight]
And a thermoplastic resin composition comprising: If the blending ratio of each copolymer is out of the above range, the effect of improving the stringing at the time of hot plate fusion is small, and the surface gloss of the molded article when deposited or sputtered without undercoating is reduced.

As long as the composition within the range of the present invention is obtained, the rubber-reinforced styrenic resin may be produced by any polymerization method. For example, a known bulk polymerization method, a solution polymerization method, a suspension polymerization method, an emulsion-suspension polymerization method, an emulsion-bulk polymerization method, and the like, as long as the composition can be controlled within the scope of the present invention, any one produced by any polymerization method can be used. Good. Further, within the scope of the present invention, the rubber-reinforced styrene-based resin may be one produced using any initiator, chain transfer agent, or emulsifier.
Examples of the initiator include a thermal decomposition initiator such as potassium persulfate;
Known initiators such as a redox initiator such as e-reducing agent-organic peroxide can be used. Known chain transfer agents such as t-dodecyl mercaptan, n-dodecyl mercaptan, α-methylstyrene dimer and terpinolene can be used. Examples of the emulsifier include fatty acid metal salt-based emulsifiers such as sodium oleate, sodium palmitate, and sodium rosinate; metal sulfonic acid salts such as sodium dodecylbenzenesulfonate, sodium alkylsulfonate having 12 to 20 carbon atoms, and sodium dioctylsulfosuccinate. A known emulsifier such as an emulsifier can be used. When producing the small particle rubber-containing graft copolymer (a2) and the medium particle rubber-containing graft copolymer (a3), in the presence of the rubber mixture of the monomer mixture, in an aqueous medium, a radical initiator May be polymerized. that time,
The monomer mixture to be graft-polymerized may be used as a mixture or, if necessary, dividedly.
Further, the method for adding the monomer mixture is not particularly limited, and the entire amount may be charged at once or may be added sequentially.

The rubber-reinforced styrene resin of the present invention varies depending on the production method. For example, it can be produced by mixing these in the form of a polymer latex, slurry, solution, powder, pellets, or a combination thereof. When recovering the polymer powder from the latex, the usual method, for example, calcium chloride, magnesium chloride in the latex,
The latex was coagulated by adding an alkaline earth metal salt such as magnesium sulfate, an alkali metal salt such as sodium chloride and sodium sulfate, and an inorganic acid and an organic acid such as hydrochloric acid, sulfuric acid, acetic acid, and phosphoric acid. Thereafter, it can be carried out by a method of dehydrating and drying. Also, a spray drying method can be used. Further, a part of the amount of the stabilizer used may be added to a latex or slurry of these resins in the form of a dispersion.

The method of blending the rubber-reinforced styrenic resin (A), which is the resin composition for vehicle lighting of the present invention, with the polycarbonate resin or the saturated polyester resin (B) can be performed, for example, by using a hen-shell mixer or a ribbon blender. Using a blender of the desired stabilizer, antioxidant,
UV absorbers, antistatic agents, lubricants, pigments, and inorganic fillers can be used as needed. In particular, the antistatic agent is effective for improving the prevention of stringing at the time of hot plate fusion. As the antistatic agent, a commonly used antistatic agent can be used. Among them, alkane sulfonates, alkylbenzene sulfonates, polyalkylene glycols, polyalkylene glycol-based copolymers or polyetheresteramides are excellent in the effect of preventing and improving the stringing phenomenon at the time of hot plate fusion.

Also, phenol-based, sulfur-based, phosphorus-based or hindered-amine-based stabilizers, benzophenone-based or benzotriazole-based ultraviolet absorbers, and organopolysiloxanes, ethylenebisstearic amides, aliphatic hydrocarbons and higher fatty acids Lubricants such as esters of higher alcohols and the like can be used as molding resins for higher performance. These stabilizers and lubricants can be used alone or in combination of two or more.

In the present invention, a heated hot plate is pressed against a lamp body molded from the thermoplastic resin composition as described above to melt it, and then the molten portion is pressed against a lamp lens to form a lamp body and a lamp lens. To manufacture a vehicular lamp. The temperature of the hot plate in the above case is 250 to 500
It is preferred to carry out by heating to ° C. If the temperature is lower than 250 ° C., the adhesive strength is insufficient. Further, as the lamp lens to be joined to the lamp body, it is preferable to use a lens obtained by molding a methyl methacrylate resin from the viewpoint that transparency and strong adhesive strength of the lens can be obtained.

[0029]

The present invention will be described below in more detail with reference to examples, but these examples do not limit the present invention in any way. In the description of the examples, unless otherwise specified.
“Parts” represents parts by weight, and “%” represents weight%. The abbreviations being implemented have the following meanings.

AN: acrylonitrile St: styrene MMA: methyl methacrylate PMI: phenylmaleimide CHP: cumene hydroperoxide tDM: t-dotecilmercaptan αMSt: α-methylstyrene (1) Production of styrene copolymer (a1) The following substances were charged into a reactor equipped with a stirrer, a reflux condenser, a nitrogen inlet, a monomer inlet, and a thermometer. Pure water 250 parts Sodium laurate 3 parts Sodium formaldehyde sulfoxylate 0.4 parts Ferrous sulfate 0.0025 parts Disodium ethylenediaminetetraacetate 0.01 parts Heating to 60 ° C under a nitrogen stream while stirring the reactor I let it. After the temperature reached 60 ° C., the monomers (I) shown in Table 1 were charged. After sufficient emulsification, the monomers (I
I) was continuously added dropwise over a period of 6 hours.
Stirring was continued at 1 ° C. for 1 hour to complete the polymerization. A11, a12, a13
And a14 were obtained.

[0031]

[Table 1] (2) Production of small particle size rubber-containing graft copolymer (a2) and medium particle size rubber-containing graft copolymer (a3) The following rubbery latex was obtained by a known method. Incidentally, the volume average particle diameter of the latex was determined by taking a transmission electron micrograph by an osmium tetroxide staining method or the like, measuring the particle diameter of 500 to 1000 rubber-like dispersed particles, and calculating the average particle diameter. When the particles are elliptical, the average value of the major axis a and the minor axis b, that is, (a + b) / 2 was defined as the particle diameter. PBd-1: polybutadiene average particle diameter: 100 nm PBd-2: polybutadiene average particle diameter: 470 nm SBR: styrene-butadiene rubber (styrene / butadiene weight ratio: 25/75) average particle diameter: 100 nm PBA: acrylic rubber (butyl acrylate / Allyl methacrylate weight ratio: 99/1) Average particle size: 150 nm The following substances were charged into a reactor equipped with a stirrer, a reflux condenser, a nitrogen inlet, a monomer inlet, and a thermometer. Pure water 250 parts Rubbery polymer Type and amount described in Table 2 Sodium formaldehyde sulfoxylate 0.3 parts Ferrous sulfate 0.0025 parts Disodium ethylenediaminetetraacetate 0.01 parts Nitrogen stream while stirring the reactor The temperature was raised to 60 ° C. below. After the temperature reached 60 ° C., the monomer mixture shown in Table 2 was continuously added dropwise over 5 hours.
The polymerization is terminated by continuing stirring for a time, and a21, a22, a23 and a31
I got

[0032]

[Table 2] (3) Production of rubber-reinforced styrenic resin (A) The copolymers produced in the above (1) and (2) were mixed in a latex state at the ratio (solid content) shown in Table 3, and this mixed latex was mixed. An antioxidant was added to the mixture, and the mixture was coagulated with calcium chloride, and then heated, dehydrated, washed with water and dried to obtain rubber-reinforced styrene resins (powder) A1 to A8.

[0033]

[Table 3] (4) Production of Resin Composition for Molding Vehicle Lights Teflon A2200 manufactured by Idemitsu Chemical Co., Ltd. was used as an aromatic polycarbonate resin (PC), and commercially available polybutylene terephthalate (PB) was used as a saturated polyester resin.
T, viscosity average molecular weight: 31000), and 0.3 part of phenolic antioxidant (AO-20: manufactured by Asahi Denka Kogyo Co., Ltd.) and phosphorus-based to 100 parts of the resin composition shown in Table 4. 0.3 parts of stabilizer (PEP-24G: manufactured by Asahi Denka Kogyo Co., Ltd.) is blended as a common additive and pelletized at an extruder (40 mmφ single screw extruder manufactured by Osaka Seiki Co., Ltd.) at a temperature of 250 ° C. I got 150 pellets obtained
Using an injection molding machine (manufactured by FANUC), an ASTM No. 1 dumbbell and a lamp body product shown in FIG. 1 were molded at a temperature of 250 ° C., and the stringing property and vacuum deposition were evaluated using the same. (A) Evaluation of threading property using dumbbell test piece ASTM No. 1 dumbbell obtained by injection molding was applied to an aluminum flat plate heated to 350 ° C. at 10 kgf / cm.
After pressing for 10 seconds at a pressure of ² , this dumbbell is
The length [cm] of the yarn generated on the melted surface when pulled up at a speed of 0 mm / min was measured. (B) Evaluation of stringiness using lamp body product The lamp body product shown in FIG. 1 obtained by injection molding was fused at 350 ° C. and 10 kg / cm using a hot plate fusion machine.
After pressing against a hot plate made of aluminum at a pressure of ² for 10 seconds, it was determined whether or not stringing occurred on the fused surface when pulled up at a speed of 50 mm / min. Table 4 shows the results.
In addition, the evaluation of stringiness by a lamp body product was based on the following criteria.

○: No stringing (0.5 cm or less) △: Slight stringing (0.5 to 1.0 cm) ×: Stringing (1.0 cm or more) (c) Using a lamp body product Vacuum evaporation evaluation The lamp body product shown in Fig. 1 obtained by injection molding was mounted on a vacuum evaporation machine, a predetermined amount of aluminum was put into a crucible of the evaporation apparatus, the evaporation machine was sealed, and the vacuum pump was operated to activate the aluminum. Was deposited so as to have a thickness of 0.1 μm. As a comparison of vapor deposition properties, aromatic pocarbonate (P
C) A lamp body product was prepared using a resin (Teflon A2200: manufactured by Idemitsu Petrochemical Co., Ltd.), and vacuum-deposited similarly. The evaluation was based on the following criteria.

◎: Very excellent gloss ○: Excellent gloss △: Good gloss ×: Poor gloss

[0036]

[Table 4] As is clear from the results in Table 4, according to the present invention, the stringing and the vacuum in the hot plate fusion method were compared with the case where the lamp body made of the resin composition of the comparative example conventionally used was used. The deposition surface gloss is greatly improved.

[0037]

According to the present invention, one or two resins selected from a rubber-reinforced styrene-based resin, a polycarbonate resin and a saturated polyester resin containing a graft copolymer of a specific small particle diameter rubber as an essential component. By using a thermoplastic resin composition containing a resin or a thermoplastic resin composition further containing a specific antistatic agent, a general thermoplastic resin conventionally used as a material for a lamp body is used. Compared to the case of using, when a hot plate heated to the lamp body is pressed and melted, the fused portion is pressed against a lamp lens, and the lamp body and the lamp lens are joined to produce a vehicular lamp. It significantly improves the stringiness of the resin that makes up the lamp body, and can also significantly improve the gloss of the vacuum-deposited surface, especially for headlamps, turn signals, and stop runs. Useful in the manufacture of vehicular lamp, such as.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a lamp body product used for evaluation of stringiness and vacuum deposition.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lamp body 2 Lamp 3 Fusing surface 4 Lamp lens 5 Deposition surface

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C08L 69/00 C08L 69/00 // B29L 31:30 B29L 31:30 F term (reference) 4F211 AD05 AH73 TA01 TC13 TC14 TD11 TN07 TQ01 4J002 BC06W BN06X BN06Y BN12X BN12Y BN16X BN16Y BN17X BN17Y CG01Z CG02Z CH025 CL085 EV256 FD105 FD106 4J026 AA11 AA45 AA67 AA68 AB44 BA05 BA27 BA31 DB04 GA01 GA08

Claims (14)

[Claims] (A). (a1) Aromatic vinyl compound 30-9
0% by weight, 10 to 40% by weight of a vinyl cyanide compound, and 0 to 30% by weight of a monomer copolymerizable therewith.
A monomer mixture consisting of 00% by weight is polymerized, and the reduced viscosity (30 ° C., in N, N-dimethylformamide solution) of the methyl ethyl ketone soluble component is 0.3 to 1.2 dl / g.
(A2) at least one selected from the group consisting of a diene rubber polymer, an acrylic rubber polymer, a silicone rubber polymer, and an olefin rubber polymer. Rubber polymer (R) having a volume average particle size of 60 to 250 nm
a) Aromatic vinyl compound 10 in the presence of 5 to 90 parts by weight
To 90% by weight, at least one compound of a (meth) acrylate compound and a vinyl cyanide compound
100 to 2 parts by weight of a graft copolymer obtained by polymerizing 10 to 95 parts by weight of a monomer mixture consisting of 0% by weight and 0 to 30% by weight of a monomer copolymerizable therewith; a3) a diene-based rubber polymer, an acrylic-based rubber polymer, a silicone-based rubber polymer, and at least one rubber polymer selected from olefin-based rubber polymers having a volume average particle diameter of 260 to 1000 nm; A rubber polymer (R
b) Aromatic vinyl compound 1 in the presence of 15 to 90 parts by weight
0-90% by weight, (meth) acrylate compound,
At least one compound of vinyl cyanide compounds
A monomer mixture of 10 to 8 consisting of 90% by weight and a total of 100% by weight of 0 to 30% by weight of monomers copolymerizable therewith;
5 to 30 parts by weight of a graft copolymer obtained by polymerizing 5 parts by weight [100 parts by weight in total of (a1), (a2) and (a3)], and a rubber polymer content of 5 to 30% by weight. 10 to 90 parts by weight of a rubber-reinforced styrene resin, and (B). A resin composition for molding vehicle lighting, comprising 90 to 10 parts by weight of a polycarbonate resin or a saturated polyester resin [100 parts by weight in total of (A) and (B)]. 2. The resin composition according to claim 1, wherein the volume average particle size of the graft copolymer (2) is 60 to 150 nm. 3. An antistatic resin composition for molding a vehicle, comprising 0.1 to 5 parts by weight of an antistatic agent with respect to 100 parts by weight of the resin composition according to claim 1. 4. The method according to claim 1, wherein the antistatic agent is an alkane sulfonate,
The antistatic resin composition according to claim 3, which is an alkylbenzene sulfonate, a polyalkylene glycol, a polyalkylene glycol-based copolymer or a polyetheresteramide. 5. The resin composition according to claim 1, wherein the vehicle lamp is a lamp body. 6. A vehicle lamp formed by molding the resin composition according to claim 1. 7. A lamp body obtained by molding the resin composition according to claim 1. 8. A reflector obtained by molding the resin composition according to claim 1. 9. A head lamp case, a turn signal case, a back lamp case or a stop lamp case for a vehicle using the lamp body according to claim 7. 10. A vehicle characterized in that a heated hot plate is pressed against the lamp body according to claim 7 and melted, and then the fused portion is pressed against a lamp lens to join the lamp body and the lamp lens. Of manufacturing lighting fixtures. 11. The method for manufacturing a vehicular lamp according to claim 10, wherein the hot plate is heated to 250 to 500 ° C. 12. The method for manufacturing a vehicular lamp according to claim 10, wherein a lens made of methyl methacrylate resin is used as the lamp lens. 13. A vehicular lamp comprising a lamp body according to claim 7, wherein a heated hot plate is pressed against the lamp body to melt it, and then the fused portion is pressed against a lamp lens to join the lamp body and the lamp lens. 14. The vehicular lamp according to claim 13, wherein a lens made of a methyl methacrylate resin is used as the lamp lens.