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WO1999063003A1 - Composition de silicones a faible degazage se vulcanisant a basse temperature - Google Patents

Composition de silicones a faible degazage se vulcanisant a basse temperature Download PDF

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Publication number
WO1999063003A1
WO1999063003A1 PCT/US1999/011885 US9911885W WO9963003A1 WO 1999063003 A1 WO1999063003 A1 WO 1999063003A1 US 9911885 W US9911885 W US 9911885W WO 9963003 A1 WO9963003 A1 WO 9963003A1
Authority
WO
WIPO (PCT)
Prior art keywords
pbw
composition according
aminopropyldimethoxysilyl
polydimethylsiloxane
hydrophobic silica
Prior art date
Application number
PCT/US1999/011885
Other languages
English (en)
Inventor
Alfred A. Decato
Original Assignee
Loctite Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Loctite Corporation filed Critical Loctite Corporation
Priority to AU42173/99A priority Critical patent/AU4217399A/en
Publication of WO1999063003A1 publication Critical patent/WO1999063003A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica

Definitions

  • the present invention relates to Low-Outgassing
  • RTV Room Temperature Vulcanizing
  • One-part, moisture cure silicone sealants are used for many applications including preventing of water intrusion into electrical, mechanical and optical assemblies, such as transportation lights like automobile headlamps .
  • silicone sealants for prevention of water intrusion often contain a trialkoxy-terminated polydimethylsiloxane, a catalyst (such as a tin soap) , a non-reactive silicone plasticizer oil, silica and filler .
  • a catalyst such as a tin soap
  • a non-reactive silicone plasticizer oil such as silica and filler .
  • the outgassed material lost from these sealants includes lower molecular weight materials, such as methanol condensate from the curing reaction.
  • lower molecular weight materials have too low a molecular weight to recondense on surfaces distant from the sealant.
  • a fraction of the lower molecular weight materials yields non- volatile residues. Condensation of non-volatile residues on surfaces is particularly troublesome in optical assemblies, such as transportation lamps, that require beam definition. Too much residue condensation, irrespective of its transmissivity, on the inside surface of the lens of such an optical assembly will cause the beam to degrade and become more diffused. In addition, residue condensation on a reflective surface of the lens assembly will decrease luminosity.
  • silicone compositions which are moisture curable and are non- slump solids at ambient temperature but can be heated to a flowable liquid state and applied as such to substrates.
  • These compositions include a hydroxyl- functional organopolysiloxane resin (which is soluble in the composition and ordinarily is solid at room temperature, but softens when heated) a diorganopolysiloxane polymer, and optionally, a hydrolyzable silane and catalyst. See U.S. Patent No. 5,302,671 (Cifuentes) . Accordingly, and notwithstanding the state-of -the- technology, it would be desirable for silicone sealants to be low outgassing so as to avoid the drawbacks to which reference was made above .
  • the invention relates to a low-outgassing, RTV silicone composition, which includes the product of combining ⁇ , co-di (aminoalkoxysilyl) polysiloxane and insoluble hydrophobic silica.
  • the invention also relates to a process of sealing transportation headlamp assemblies with such a silicone composition, a step of which includes sealing a headlamp assembly with such a silicone composition.
  • the invention relates to headlamp assemblies produced using such a composition in such a process.
  • compositions of this invention are prepared from fewer different components, than known compositions to perform their intended function. As such, raw materials and processing time (and costs associated therewith) may be reduced as compared to conventional compositions, all else being equal.
  • the compositions of this invention autocatalyze in the absence of a separate catalyst component, and even exudate of the reactive fluid component of the compositions may tend to polymerize prior to evaporating and condensing.
  • the inventive compositions may further include a catalyst .
  • the invention is directed to low-outgassing RTV silicone compositions, which are particularly attractive as sealants.
  • the reactive fluid, ⁇ , ⁇ - di (aminoalkoxysilyl)polysiloxane is the reaction product of an aminoalkoxysilane, and a silanol-terminated polydimethylsiloxane or polydimethyldiphenylsiloxane .
  • These fluids may be prepared by reacting two moles of a silane such as 3-aminopropyltrimethoxysilane with one mole of a silanol-terminatedpolydimethylsiloxane to yield ⁇ , ⁇ -di(3- aminopropyldimethoxysilyl) polydimethylsiloxane reactive fluid and two moles of methanol as condensate. Synthesis details for this class of compounds may be found in U.S. Patent Nos. 5,300,608, 5,302,671 and 5,534,610, the disclosures of each of which are hereby expressly incorporated herein by reference.
  • the silanol-terminated fluid should be silanol- terminated polydimethylsiloxane, although silanol-terminated polydimethyldiphenylsiloxane may be used, particularly in the event when enhanced low temperature performance is desired.
  • the desirable viscosity of sealant grade silanol fluids should be in the range of about 700 to about 175,000 cPs, such as about 3,500 cPs .
  • the aminoalkoxysilane precursor should have an alkoxy functionality of at least two.
  • Examples of such aminoalkoxysilanes include 3-aminopropyltrimethoxysilane, 3- aminopropyltriethoxysilane, 4-aminobutyltriethoxysilane, (aminoethylaminomethyl)phenethyltrimethoxysilane, N- (2- aminoethyl) -3-aminopropyltrimethoxysilane, N- (6- aminohexyl) aminopropyltrimethoxysilane, 3- (m- aminophenoxy) propyltrimethoxysilane, m- aminophenyltrimethoxysilane, p-aminophenyltrimethoxysilane, 3- (1-aminopropoxy) -3 , 3 -dimethyl -1-propenyltrimethoxysilane, 3-aminopropyltris (methoxyethoxye
  • aminoalkoxysilane precursors should yield reactive fluids with the following respective terminal groups: 3- aminopropyldimethoxysilyl, 3-aminopropyldiethoxysilyl, 4- aminobutyldiethoxysilyl , (aminoethyaminomethyl) phenethyldimethoxysilyl, N- (2- aminoethyl) -3-aminopropyldimethoxysilyl, N- (6- aminohexyl ) aminopropyldimethoxysilyl , 3 - (m- aminophenoxy) propy1dimethoxysily1 , m- aminophenyldimethoxysilyl, p-aminophenyldimethoxysilyl, 3- (1-aminopropoxy) -3, 3 -dimethyl -1-propenyldimethoxysilyl, 3- aminopropylbis (methoxyethoxyethoxy) silyl
  • This reactive fluid may then be mixed with an . insoluble hydrophobic silica for reinforcement purposes.
  • the insoluble hydrophobic silica should be a high surface area silica, such as fumed, colloidal and precipitated silicas. Most of the hydroxyl groups on these silicas have been capped by materials such as siloxane fluids, octyltrimethoxysilane, methyldimethoxysilane and the like, to prevent the pendant hydroxyl from inducing premature gelation and to improve compatibility, and hence, ease of incorporation of the silicas into the ⁇ , ⁇ - di (aminoalkoxysilyl) polysiloxane .
  • Desirable treated silicas are hexamethyldisilazane (“HMDS”) treated and polydimethylsiloxane (“PDMS”) treated silicas .
  • HMDS hexamethyldisilazane
  • PDMS polydimethylsiloxane
  • a particularly desirable HMDS-treated silica is R-
  • HMDS-treated silicas include Tellenox 500, commercially available from Tulco. Inc. and HDK 2000, commercially available from Wacker-Chemie.
  • a particularly desirable PDMS-treated silica is Cab-O-Sil N70-TS (commercially available from the Cabot
  • TMS trimethylsilyl
  • AEROSIL R202 commercially available from Degussa, is believed to be a comparable treated silica product.
  • treated silicas suitable for use in the inventive compositions are those treated with trialkoxy alkyl silanes, an example of which is AEROSIL R805 (commercially available from Degussa) , which is a trimethoxyoctylsilane-treated silica having a surface area of 150 m 2 /gm.
  • AEROSIL R805 commercially available from Degussa
  • dimethyldichlorosilane-treated silicas include AEROSIL R972, AEROSIL R974 and AEROSIL R976, each of which are commercially available from Degussa.
  • the optional catalyst may be chosen from a raft of commercial materials available, such as titanates like tetraisopropoxy titanate, tetrabutyl titanate, titanate chelates, carboxylic acid salts of tin like dibutyltindilaurate, dibutyl tin diacetate, tin octanoate, dibutyltindihydroxide, carboxylic acid salts of zinc like zinc octanoate, carboxylic acid salts of iron and mixtures thereof.
  • the catalyst may be included at levels of up to about 5% w/w.
  • the optional filler may be chosen from any filler material known to those persons of ordinary skill in the art.
  • An example of a desirable filler is calcium carbonate.
  • the filler may be included at levels of up to about 70% w/w.
  • the crosslinker should be of the condensation type and, as described above, should be employed when the ⁇ , ⁇ - di (aminoalkoxysilane) polysiloxane functionality is two.
  • examples of the crosslinker include vinyltrimethoxysilane, 1, 3-dimethyltetramethoxydisiloxane, tetraethoxysilane, tetramethoxysilane, tetra n-propoxysilane, methytrimethoxysilane, methyltriethoxysilane and mixtures thereof.
  • the crosslinker should be selected with care so that the leaving groups thereon do not contribute to nonvolatile residue or interfere with the cure of the ⁇ , ⁇ - di (aminoalkoxysilyl) olysiloxane. Accordingly, vinyltrimethoxysilane is a desirable choice. When used, the crosslinker should be included at levels of up to about 30% w/w.
  • the reactive fluid described above has a functionality of 4; if the silane precursor had been 3- aminopropyldimethoxymethylsilane, the functionality of the resulting fluid would be two and crosslinker would be required in order to form a thermoset . Therefore, crosslinker should be included when the alkoxy functionality of the ⁇ , ⁇ -di (aminoalkoxysilyl) polysiloxane is two. While alkoxy leaving groups are desirable, the reaction product of an amino functional silane having at least two hydrolyzable groups generally and a silanol terminated polysiloxane is also an embodiment of the invention. Alternative hydrolyzable groups include ketoximes and the like.
  • Additional additives include colorants such as carbon black, biocides, adhesion promoters, such functionalized silane, titanate and zirconate coupling agents, desiccants, such as molecular sieves and the like, and are typically present at levels of up to about 20% w/w.
  • colorants such as carbon black, biocides, adhesion promoters, such functionalized silane, titanate and zirconate coupling agents, desiccants, such as molecular sieves and the like, and are typically present at levels of up to about 20% w/w.
  • EXAMPLE 2 A moisture cure one-part silicone sealant was prepared by combining the following ingredients: 348 grams (58 pbw) of ⁇ , ⁇ -di(3- aminopropyldimethoxysilyl) polydimethylsiloxane as prepared in Example 1, 48 grams (8 pbw) of insoluble hydrophobic silica (R-812S) , 18 grams (3 pbw) of vinyltrimethoxysilane, 180 grams (30 pbw) of calcium carbonate filler and 3.3 grams (0.5 pbw) of a tin soap catalyst (Fomrez UL-2, commercially available Witco Corp., Greenwich, CT) .
  • a tin soap catalyst Femrez UL-2, commercially available Witco Corp., Greenwich, CT
  • ⁇ , ⁇ -di(3- aminopropyldimethoxysilyl) polydimethylsiloxane was charged to a mixer and vinyltrimethoxysilane was added and mixed under a vacuum for a period of time of about 15 minutes. Vacuum was broken with nitrogen, and insoluble hydrophobic silica was added and mixed under a vacuum with high shear for a period of time of about 20 minutes. Vacuum was again broken with nitrogen, and calcium carbonate was added and mixed under vacuum with medium shear for 30 minutes, keeping the temperature below about 100°F. Vacuum was broken with nitrogen, and the mixer was scraped down under nitrogen sparge . Then catalyst was added and mixed under vacuum for a period of time of about 15 minutes, while the mixture cooled to room temperature .
  • EXAMPLE 3 A moisture cure one-part silicone sealant was prepared using the process described in Example 2 by combining the following ingredients: 348 grams (52 pbw) ⁇ , co-di (3 -aminopropyldimethoxysilyl) polydimethylsiloxane as prepared in Example 1, 60 grams (9 pbw) insoluble hydrophobic silica (R-812S) , 18 grams (3 pbw) vinyltrimethoxysilane, 240 grams (36 pbw) calcium carbonate filler and 3.3 grams (0.5 pbw) tin soap catalyst (Fomrez UL- 2) .
  • EXAMPLE 4 A moisture cure one-part silicone sealant was prepared using the process described in Example 2 by combining the following ingredients: 348 grams (52 pbw) ⁇ , co-di (3 -aminopropyldimethoxysilyl) polydimethylsiloxane as prepared in Example 1, 60 grams (9 pbw) insoluble hydrophobic
  • a moisture cure one-part silicone sealant was prepared using the process described in Example 2 by combining the following ingredients: 416 grams (52 pbw) ⁇ , ⁇ -di (3 -aminopropyldimethoxysilyl) polydimethylsiloxane as prepared in Example 1, 72 grams (9 pbw) insoluble hydrophobic silica (R-812S) , 21.6 grams (3 pbw) vinyltrimethoxysilane, 286 grams (36 pbw) calcium carbonate filler, 4 grams (0.5 pbw) tin soap catalyst (Fomrez UL-2) and 0.16 grams (0.02 pbw) carbon black.
  • a moisture cure one-part silicone sealant was prepared using the process described in Example 2 by combining the following ingredients: 316 grams (53 pbw) ⁇ , ⁇ -di (3 -aminopropyldimethoxysilyl) polydimethylsiloxane as prepared in Example 1, 54 grams (9 pbw) insoluble hydrophobic silica (R-812S) , 12 grams (2 pbw) vinyltrimethoxysilane, 215g (36 pbw) calcium carbonate filler, 4 grams (0.5 pbw) dibutytin bis-neodecanoate catalyst and 0.12 grams (0.02 pbw) carbon black.
  • EXAMPLE 6 A moisture cure one-part silicone sealant was using the process described in Example 4 prepared and by combining the following ingredients: 11.6 Kg ⁇ , ⁇ -di (3- aminopropyldimethoxysilyl) polydimethylsiloxane as prepared in Example 1, 1.42 Kg insoluble hydrophobic silica (R-812S) , 0.495 Kg vinyltrimethoxysilane, 5.4 Kg calcium carbonate filler, 0.003 Kg carbon black and 0.075 Kg tin soap catalyst (Fomrez UL-2) .
  • the sealant produced had the following properties: a durometer of 44 Shore A, an elongation to failure of 187+4%, a skin-over time of 45 minutes, tear strength, Die B of 38 ⁇ 3 psi, boeing sag @ 2 minutes of 1.3 inches and the following extrusion rates @ 90 psi, 1/8" orifice: Day 1, 130 gpm; Day 2, 114 gpm; Day 3, 160 gpm; Day 6, 196 gpm; Day 10, 150 gpm; Day 13, 159 gpm; Day 15, 154 gpm; Day 17, 156 gpm; Day 20, 212 gpm.
  • the sealant also possessed a tensile strength of 360 ⁇ 5 (psi) , and a modulus @ 50% of 158 ⁇ 8 and a modulus @ 100% 257 ⁇ 8.
  • a moisture cure one-part silicone sealant was prepared using the process described in Example 4 and by combining the following ingredients: 3.3 Kg (50.68 phr) ⁇ , ⁇ -di (3 -aminopropyldimethoxysilyl) polydimethylsiloxane as prepared in Example 1, 0.618 Kg (9.5 phr) insoluble hydrophobic silica (R-812S) , 0.215 Kg (3.3 phr) vinyltrimethoxysilane, 2.44 Kg (36 phr) calcium carbonate filler, 0.0013 Kg (0.02 phr) carbon black and 0.0033 Kg (0.5 phr) tin soap catalyst (Fomrez UL-2) .
  • the sealant produced had the following properties : a durometer of 44 Shore A, an elongation to failure of 148 ⁇ 20%, a skin-over time of 28 minutes and the following extrusion rates @ 90 psi, 1/8" orifice: Day 1, 100 gpm; Day 2, 73 gpm; Day 5, 65 gpm; Day 6, 196 gpm; Day 9, 70 gpm; Day 12, 59 gpm; Day 14, 60 gpm; Day 16, 56 gpm; Day 19, 52 gpm; Day 32, 53 gpm; Day 73, 47 gpm.
  • the sealant also possessed a tensile strength of 438 ⁇ 8 (psi) , and a modulus @ 50% of 246 ⁇ 12 and a modulus @ 100% of 366 ⁇ 18.
  • a moisture cure one-part silicone sealant was prepared by combining the following ingredients : 7.93 Kg (52.88 phr) ⁇ , ⁇ -di (3- aminopropyldimethoxysilyl) polydimethylsiloxane as prepared in Example 1, 1.28 Kg (8.5 phr) insoluble hydrophobic silica (R-812S) , 510 Kg (3.4 phr) vinyltrimethoxysilane, 5.25 Kg (35 phr) calcium carbonate filler, 0.003 Kg (0.02 phr) carbon black and 0.030 Kg (0.2 phr) tin soap catalyst (Fomrez UL-2) .
  • vinyltrimethoxysilane was added to ⁇ , ⁇ -di (3 -aminopropyldimethoxysilyl) polydimethylsiloxane (as prepared in Example 1) in a Myers mixer under nitroged, and mixed at slow speed for a period of time of about 5 minutes.
  • the treated fumed silica was then added, and mixing at high shear was allowed to continue for a period of time of about 10 minutes.
  • the calcium carbonate filler, and carbon black were next added, and mixing with high shear under nitrogen for a period of time of about 20 minutes, while maintaining the temperature at less than about 105°F.
  • the sealant produced had the following properties: a durometer of 50 Shore A, an elongation to failure of 148+20%, a skin-over time of 12 minutes, a tear strength (Die B) of 56 ⁇ 9 psi (62, 46, 61, and 46 nicked, 61 and 62 without nicking), a weight per gallon of 11.08 pounds, a boeing sag @ 2 minutes of 0.75 inches, an elongation to failure of 178 ⁇ 6% and the following extrusion rate @ 90 psi, 1/8" orifice: Day 1, 100 gpm; Day 2, 50 gpm; Day 5, 55 gpm; Day 8, 57 gpm; Day 13, 84 gpm; Day 17, 89 gpm; Day 34, 65 gpm; Day 58, 116 gpm.
  • the sealant also possessed
  • Example 9 The sealant prepared in Example 2 was applied to the sealing channel of an automotive foglamp. This assembly includes two parts: a plastic housing and a polycarbonate lens. After applying the sealant, the parts were mated and conditioned at a temperature of about 25°C and 50% RH for a period of time of about 5 days, allowing the material to fully cure.
  • Halogen lamps were placed in the assemblies and lit by a 12V DC power supply for a period of time of about 2 hours.
  • all of the lamps with the exception of the assembly prepared with the sealant of Example 2 , exhibited a fogging of the reflective surface inside the housing.
  • the fogging was observed visually to be as fine, white particulates that appear as a haze or diffuse coating.
  • the metallized surface remained clear and very reflective.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

L'invention porte sur une composition de silicones à faible dégazage se vulcanisant à basse température et comprenant le produit de la combinaison de α, φ-di(aminoalkoxysilyl)polysiloxane et de silice hydrophobe insoluble. L'invention porte également sur un procédé d'étanchéification des phares de véhicules à l'aide de ladite composition dont une étape a trait à son application sur le phare, et sur les phares produits à l'aide d'une telle composition et d'un tel procédé.
PCT/US1999/011885 1998-06-04 1999-05-28 Composition de silicones a faible degazage se vulcanisant a basse temperature WO1999063003A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU42173/99A AU4217399A (en) 1998-06-04 1999-05-28 Low-outgassing, room temperature vulcanizing silicone compositions

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US8813398P 1998-06-04 1998-06-04
US60/088,133 1998-06-04

Publications (1)

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WO1999063003A1 true WO1999063003A1 (fr) 1999-12-09

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008034806A1 (fr) * 2006-09-18 2008-03-27 Dow Corning Corporation Charges, pigments et poudres minérales traités par des organopolysiloxanes
CN105950099A (zh) * 2016-04-27 2016-09-21 宁波高新区夏远科技有限公司 一种单组分脱醇型室温硫化硅橡胶及其制备方法、应用
US20210277238A1 (en) * 2020-03-09 2021-09-09 Wolfgang Hechtl Preparation for producing a polymer crosslinkable by condensation reaction, polymer composition crosslinkable by condensation reaction, process for producing a silicone elastomer and silicone elastomer
US20230096128A1 (en) * 2017-10-06 2023-03-30 Shin-Etsu Chemical Co., Ltd. Method for manufacturing room-temperature-curable organopolysiloxane composition, room-temperature-curable organopolysiloxane composition, and article

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4483973A (en) * 1982-02-17 1984-11-20 General Electric Company Adhesion promoters for one-component RTV silicone compositions
US5175057A (en) * 1991-06-25 1992-12-29 General Electric Company Adhesion promoters for room temperature vulcanizable silicone compositions
US5302671A (en) * 1993-06-11 1994-04-12 Dow Corning Corporation Moisture-curable compositions containing aminoalkoxy-functional silicone
US5688840A (en) * 1994-10-04 1997-11-18 Toshiba Silicone Co., Ltd. Process for preparing room temperature-curable organopolysiloxane composition

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4483973A (en) * 1982-02-17 1984-11-20 General Electric Company Adhesion promoters for one-component RTV silicone compositions
US5175057A (en) * 1991-06-25 1992-12-29 General Electric Company Adhesion promoters for room temperature vulcanizable silicone compositions
US5302671A (en) * 1993-06-11 1994-04-12 Dow Corning Corporation Moisture-curable compositions containing aminoalkoxy-functional silicone
US5688840A (en) * 1994-10-04 1997-11-18 Toshiba Silicone Co., Ltd. Process for preparing room temperature-curable organopolysiloxane composition

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008034806A1 (fr) * 2006-09-18 2008-03-27 Dow Corning Corporation Charges, pigments et poudres minérales traités par des organopolysiloxanes
US9115285B2 (en) 2006-09-18 2015-08-25 Dow Corning Corporation Fillers, pigments and mineral powders treated with organopolysiloxanes
CN105950099A (zh) * 2016-04-27 2016-09-21 宁波高新区夏远科技有限公司 一种单组分脱醇型室温硫化硅橡胶及其制备方法、应用
CN105950099B (zh) * 2016-04-27 2018-12-07 深圳市利群通电子科技有限公司 一种单组分脱醇型室温硫化硅橡胶及其制备方法、应用
US20230096128A1 (en) * 2017-10-06 2023-03-30 Shin-Etsu Chemical Co., Ltd. Method for manufacturing room-temperature-curable organopolysiloxane composition, room-temperature-curable organopolysiloxane composition, and article
US12098279B2 (en) * 2017-10-06 2024-09-24 Shin-Etsu Chemical Co., Ltd. Method for manufacturing room-temperature-curable organopolysiloxane composition, room-temperature-curable organopolysiloxane composition, and article
US20210277238A1 (en) * 2020-03-09 2021-09-09 Wolfgang Hechtl Preparation for producing a polymer crosslinkable by condensation reaction, polymer composition crosslinkable by condensation reaction, process for producing a silicone elastomer and silicone elastomer
US12018151B2 (en) * 2020-03-09 2024-06-25 Wolfgang Hechtl Preparation for producing a polymer crosslinkable by condensation reaction, polymer composition crosslinkable by condensation reaction, process for producing a silicone elastomer and silicone elastomer

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