US4495330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crosslinkers for RTV compositions
Assignee: General Electric Co
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Filing: 1983-05-25
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Granted: 1985-01-22
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Expires: 2003-05-25
Abstract
Abstract Stable, substantially acid free, one package organopolysiloxane compositions are provided which have a base polymer, a condensation catalyst, a silane scavenger for hydroxy functional groups having cycloaliphatic enoxy functionality, and a curing accelerator, said compositions being curable upon exposure to atmospheric moisture to translucent and colorless tack-free elastomers.
Inventors
- 👤 Rack H. Chung, deceased
- 👤 executrix by Betsy A. Chung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:10
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/54; C08K5/541; C08K5/5435; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/16; C08G77/18; Y; Y10; Y10S; Y10S528/00; Y10S528/901
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
171 words
A stable, one package, substantially anhydrous and substantially acid-free, room temperature vulcanizable organopolysiloxane composition stable under ambient conditions in the substantial absence of moisture over an extended period of time and convertible to a translucent and colorless tack-free elastomer comprising: (A) a polydiorganosiloxane base polymer wherein the silicon atom at each chain end is terminated with at least two alkoxy radicals; (B) an effective amount of condensation catalyst; (C) a stabilizing amount of silane scavenger for hydroxy functional groups having the formula: ##STR12## where R 1 is a C.sub.(1-8) aliphatic organic radical selected from alkyl, alkylether, alkylester, alkylketone and alkylcyano or a C.sub.(7-13) aralkyl radical, R 2 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, X is a cycloaliphatic enoxy radical, a is a whole number equal to 1 to 4, b is a whole number equal to 0 to 3, and the sum of a+b equals 1 to 4; and (D) an effective amount of curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.
Claim 2
Dependent Claim
171 words
A stable, one package, substantially anhydrous and substantially acid-free, room temperature vulcanizable organopolysiloxane composition stable under ambient conditions in the substantial absence of moisture over an extended period of time and convertible to a translucent and colorless tack-free elastomer comprising: (A) a polydiorganosiloxane base polymer wherein the silicon atom at each chain end is terminated with at least two alkoxy radicals; (B) an effective amount of condensation catalyst; (C) a stabilizing amount of silane scavenger for hydroxy functional groups having the formula: ##STR12## where R 1 is a C.sub.(1-8) aliphatic organic radical selected from alkyl, alkylether, alkylester, alkylketone and alkylcyano or a C.sub.(7-13) aralkyl radical, R 2 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, X is a cycloaliphatic enoxy radical, a is a whole number equal to 1 to 4, b is a whole number equal to 0 to 3, and the sum of a+b equals 1 to 4; and (D) an effective amount of curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof.
Claim 3
Dependent Claim
62 words
The composition of claim 1 further comprising an effective amount of crosslinking silane of the formula: ##STR13## where R 1 is a (C 1-8 ) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano or a C.sub.(7-13) aralkyl radical, R 2 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical and e equals 0 or 1.
Claim 4
Dependent Claim
29 words
The composition of claim 1 wherein R 2 of the silane scavenger for hydroxy functional groups is selected from the group consisting of methyl, ethyl, propyl, vinyl and phenyl.
Claim 5
Dependent Claim
21 words
The composition of claim 1 wherein R 1 and R 2 of the silane scavenger for hydroxy functional groups is methyl.
Claim 6
Dependent Claim
24 words
The composition of claim 1 wherein the cycloaliphatic enoxy radical of the silane scavenger has from 5 to 8 carbon atoms in the ring.
Claim 7
Dependent Claim
23 words
The composition of claim 1 wherein the cycloaliphatic enoxy radical of the silane scavenger has 5 or 6 carbon atoms in the ring.
Claim 8
Dependent Claim
21 words
The composition of claim 1 wherein the silane scavenger is selected from the group consisting of methyldimethoxycyclohexenoxysilane, methyldimethoxycyclopentenoxysilane and methyldimethoxy (3,3,5-trimethyl-1,5-cyclohexadiene-1-oxy)silane.
Claim 9
Dependent Claim
15 words
The composition of claim 1 further comprising up to about 700 parts by weight filler.
Claim 10
Dependent Claim
39 words
The composition of claim 8 wherein the filler is selected from the group consisting of titanium dioxide, zirconium silicate, silica aerogel, iron oxide, diatomaceous earth, fumed silica, carbon black, precipitated silica, glass fibers, polyvinylchloride, ground quartz and calcium carbonate.
Claim 11
Dependent Claim
13 words
The composition of claim 1 further comprising an effective amount of adhesion promoter.
Claim 12
Dependent Claim
14 words
The composition of claim 1 further comprising an effective amount of sag control agent.
Claim 13
Dependent Claim
12 words
The composition of claim 1 further comprising an effective amount of plasticizer.
Claim 14
Dependent Claim
13 words
The composition of claim 1 wherein the condensation catalyst is a tin compound.
Claim 15
Dependent Claim
11 words
The composition of claim 13 wherein the tin compound is dibutyltindiacetate.
Claim 16
Independent Claim
297 words
A method for making a one package, substantially anhydrous and substantially acid-free room temperature vulcanizable composition curable to the solid elastomeric state, which method comprises agitating under substantially anhydrous conditions at a temperature in the range of from 0° C. to 180° C., a room temperature vulcanizable material selected from: (i) a mixture comprising: (a) 100 parts of a silanol terminated polydiorganosiloxane consisting essentially of chemically combined units of the formula ##STR14## (b) an effective amount of a condensation catalyst, (c) a stabilizing amount of a silane scavenger for hydroxy functional groups of the formula ##STR15## (d) 0-10 parts of a crosslinking silane of the formula ##STR16## (e) 0.1-5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof; and (ii) a mixture comprising: (a) 100 parts of a polydiorganosiloxane base polymer wherein the silicon atom at each chain end is terminated with at least two alkoxy radicals; (b) an effective amount of a condensation catalyst; (c) a stabilizing amount of a silane scavenger for hydroxy functional groups having the formula ##STR17## (d) 0-10 parts of a crosslinking silane of the formula ##STR18## (e) 0.1-5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof; where R is selected from C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radicals, R 1 is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano, or a C.sub.(7-13) aralky radical, R 2 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, X is a cycloaliphatic enoxy radical, a is a whole number equal to 1 to 4, b is a whole number equal to 0 to 3, the sum of a+b equals 1 to 4, and e equals 0 or 1.
Claim 17
Independent Claim
297 words
A method for making a one package, substantially anhydrous and substantially acid-free room temperature vulcanizable composition curable to the solid elastomeric state, which method comprises agitating under substantially anhydrous conditions at a temperature in the range of from 0° C. to 180° C., a room temperature vulcanizable material selected from: (i) a mixture comprising: (a) 100 parts of a silanol terminated polydiorganosiloxane consisting essentially of chemically combined units of the formula ##STR14## (b) an effective amount of a condensation catalyst, (c) a stabilizing amount of a silane scavenger for hydroxy functional groups of the formula ##STR15## (d) 0-10 parts of a crosslinking silane of the formula ##STR16## (e) 0.1-5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof; and (ii) a mixture comprising: (a) 100 parts of a polydiorganosiloxane base polymer wherein the silicon atom at each chain end is terminated with at least two alkoxy radicals; (b) an effective amount of a condensation catalyst; (c) a stabilizing amount of a silane scavenger for hydroxy functional groups having the formula ##STR17## (d) 0-10 parts of a crosslinking silane of the formula ##STR18## (e) 0.1-5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof; where R is selected from C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radicals, R 1 is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano, or a C.sub.(7-13) aralky radical, R 2 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, X is a cycloaliphatic enoxy radical, a is a whole number equal to 1 to 4, b is a whole number equal to 0 to 3, the sum of a+b equals 1 to 4, and e equals 0 or 1.
Claim 18
Dependent Claim
13 words
The method of claim 15 wherein the condensation catalyst is a tin compound.
Claim 19
Dependent Claim
11 words
The method of claim 16 wherein the tin compound is dibutyltindiacetate.
Claim 20
Dependent Claim
29 words
The method of claim 15 wherein R 2 of the silane scavenger for hydroxy functional groups is selected from the group consisting of methyl, ethyl, propyl, vinyl and phenyl.
Claim 21
Dependent Claim
21 words
The method of claim 15 wherein R 1 and R 2 of the silane scavenger for hydroxy functional groups is methyl.
Claim 22
Dependent Claim
24 words
The method of claim 15 wherein the cycloaliphatic enoxy radical of the silane scavenger has from 5 to 8 carbon atoms in the ring.
Claim 23
Dependent Claim
23 words
The method of claim 15 wherein the cycloaliphatic enoxy radical of the silane scavenger has 5 or 6 carbon atoms in the ring.
Claim 24
Dependent Claim
21 words
The method of claim 15 wherein the silane scavenger is selected from the group consisting of methyldimethoxycyclopentenoxysilane, and methyldimethoxy (3,3,5-trimethyl-1,5-cyclohexadiene-1-oxy) silane.
Claim 25
Dependent Claim
15 words
The method of claim 15 further comprising up to about 700 parts by weight filler.
Claim 26
Dependent Claim
40 words
The method of claim 23 wherein the filler is selected from the group consisting of titanium dioxide, zirconium silicate, silica aerogel, iron oxide, diatomaceous earth, fumed silica, carbon black, precipitated silica, glass fibers, polyvinyl chloride, ground quartz, and calcium carbonate.
Claim 27
Dependent Claim
13 words
The method of claim 15 further comprising an effective amount of adhesion promoter.
Claim 28
Dependent Claim
14 words
The method of claim 15 further comprising an effective amount of sag control agent.
Claim 29
Dependent Claim
12 words
The method of claim 15 further comprising an effective amount of plasticizer.
Claim 30
Dependent Claim
144 words
A stable, one package, substantially anhydrous and substantially acid-free, room temperature vulcanizable organopolysiloxane composition stable under ambient conditions in the substantial absence of moisture over an extended period of time and convertible to a translucent and colorless tack-free elastomer, comprising: (A) a silanol endstopped polydiorganosiloxane base polymer; (B) an effective amount of condensation catalyst; (C) a stabilizing amount of silane scavenger for hydroxy functional groups having the formula ##STR19## where R 1 is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano or a C.sub.(7-13) aralkyl radical, R 2 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, X is a cycloaliphatic enoxy radical, and the silane is both the scavenger for hydroxy functional groups and a polyalkoxysilane crosslinking agent for terminating the silicon atom at each polydiorganosiloxane chain end with at least two alkoxy radicals.
Claim 31
Dependent Claim
144 words
A stable, one package, substantially anhydrous and substantially acid-free, room temperature vulcanizable organopolysiloxane composition stable under ambient conditions in the substantial absence of moisture over an extended period of time and convertible to a translucent and colorless tack-free elastomer, comprising: (A) a silanol endstopped polydiorganosiloxane base polymer; (B) an effective amount of condensation catalyst; (C) a stabilizing amount of silane scavenger for hydroxy functional groups having the formula ##STR19## where R 1 is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano or a C.sub.(7-13) aralkyl radical, R 2 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, X is a cycloaliphatic enoxy radical, and the silane is both the scavenger for hydroxy functional groups and a polyalkoxysilane crosslinking agent for terminating the silicon atom at each polydiorganosiloxane chain end with at least two alkoxy radicals.
Claim 32
Dependent Claim
61 words
The composition of claim 28, further comprising an effective amount of a crosslinking silane of the formula: ##STR20## where R 1 is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano or a C.sub.(7-13) aralkyl radical, R 2 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, and e equals 0 or 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |