Claims
- 1. A stable, one-package, substantially anhydrous and substantially acid-free, room temperature vulcanizable organopolysiloxane compositions stable under ambient conditions in the substantial absence of moisture over an extended period of time and convertible to a tack-free elastomer comprising: (1) an organopolysiloxane wherein the silicon atom at each polymer chain end is terminated with at least 2 alkoxy radicals; (2) an effective amount of a condensation catalyst; (3) a stabilizing amount of silane scavenger for hydroxy functional groups having the formula ##STR37## where R is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) aralkyl radical, R.sup.1 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, Y is a ##STR38## radical, where R.sup.2 and R.sup.3 are selected from the group consisting of hydrogen, a C.sub.(1-12) alkyl, alkenyl, alkylester, alkylether, aryl, alkaryl and a aralkyl radical, n is a whole number that varies from 2 to 4 and 6, 7, 8, c is a whole number equal to 0 to 3 inclusive, f is an integer equal to 1 to 4 inclusive and the sum of c+f is equal to 1 to 4 inclusive.
- 2. The composition of claim 1, wherein the silane has the formula ##STR39## where R is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) aralkyl radical, R.sup.1 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, Y is a ##STR40## radical where R.sup.2 and R.sup.3 are selected from the group consisting of hydrogen, a C.sub.(1-12) alkyl, alkenyl, alkylester, alkylether, aryl, alkaryl and aralkyl radical, n is a whole number that varies from 2 to 4 and 6, 7, 8, and a is an integer equal to 1 to 2 inclusive, b is a whole number equal to 0 to 1 inclusive, and the sum of b+a is equal to 1 to 2 inclusive and the silane is both the silane scavenger for hydroxy functional groups and a polyalkoxysilane cross-linking agent for terminating the silicon atom at each organopolysiloxane chain end with at least two alkoxy radicals.
- 3. 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 tack-free elastomer comprising: (1) an organopolysiloxane wherein the silicon atom at each polymer chain end is terminated with at least 2 alkoxy radicals; (2) an effective amount of a condensation catalyst; (3) a stabilizing amount of silane scavenger for hydroxy functional groups having the formula ##STR41## where R is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone, and alkylcyano radicals, or a C.sub.(7-13) aralkyl radical, R.sup.1 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, Y is a ##STR42## radical where R.sup.2 and R.sup.3 are selected from the group consisting of hydrogen, a C.sub.(1-12) alkyl, alkenyl, alkylester, alkylether, aryl, alkaryl and a aralkyl radical, n is a whole number that varies from 2 to 4 and 6, 7, 8, c is a whole number equal to 0 to 3 inclusive, f is an integer equal to 1 to 4 inclusive and the sum of c+f is equal to 1 to 4 inclusive; and (4) an effective amount of a curing accelerator selected from the group consisting of substituted quanidines, amines and mixtures thereof.
- 4. A one-package, room temperature vulcanizable polyalkoxy-terminated organopolysiloxane composition in accordance with claim 1, where the polyalkoxy-terminated organopolysiloxane has the formula ##STR43## where R.sup.4 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, R is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) aralkyl radical, R.sup.1 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, Y is a ##STR44## radical where R.sup.2 and R.sup.3 are selected from the group consisting of hydrogen, a C.sub.(1-12) alkyl, alkenyl, alkylester, alkylether, aryl, alkaryl and an aralkyl radical, n is a whole number that varies from 2 to 4, 6, 7, 8, and b is a whole number equal to 0 or 1, e is a whole number equal to 0 or 1 inclusive and the sum of b+e is equal to 0 or 1 inclusive, and s is an integer having a value of from about 50 to about 2500 inclusive.
- 5. A room temperature vulcanizable composition in accordance with claim 1, having an effective amount of a cross-linking silane of the formula ##STR45## where R.sup.1 is C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) aralkyl radical, R.sup.1 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, and b is a whole number equal to 0 or 1.
- 6. A room temperature vulcanizable composition in accordance with claim 1, where the silane scavenger is methyldimethoxy-2-pyrrolidonosilane.
- 7. A room temperature vulcanizable composition in accordance with claim 1, which contains a tin compound as the condensation catalyst.
- 8. A room temperature vulcanizable composition in accordance with claim 4, where R.sup.4, R and R.sup.1 are methyl and which has a tin compound as a condensation catalyst.
- 9. A stable, one-package, substantially anhydrous and substantially acid-free, room temperature vulcanizable composition comprising a polymethoxy-terminated polydimethylsiloxane, an effective amount of a tin containing condensation catalyst, and an effective amount of a polymethoxy-2-pyrrolidonosilane scavenger.
- 10. A stable, one-package, substantially anhydrous and substantially acid-free, room temperature vulcanizable composition comprising a polymethoxy-terminated polydimethylsiloxane, an effective amount of a tin containing condensation catalyst, an effective amount of trimethoxysilylpropyltetramethylguanidine curing accelerator and an effective amount of a polymethoxy-2-pyrrolidonosilane scavenger.
- 11. A room temperature vulcanizable composition in accordance with claim 9, containing dibutyltindiacetate.
- 12. A room temperature vulcanizable composition in accordance with claim 9, containing a polymethoxysilane cross-linking agent.
- 13. A stable and substantially acid-free one-package room temperature vulcanizable polyalkoxy-terminated organopolysiloxane composition curable under ambient conditions to a tack-free elastomer over an extended period of time comprising on a weight basis,
- (i) 100 parts of a substantially silanol-free polyalkoxysiloxydiorganopolysiloxane of the formula ##STR46## (ii) 0 to 10 parts of a cross-linking polyalkoxysilane of the formula ##STR47## (iii) an effective amount of a condensation catalyst, and (iv) a stabilizing amount of a silane scavenger for hydroxy functional groups having the formula ##STR48## where R.sup.4 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, R is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone, and alkylcyano radicals, or a C.sub.(7-13) aralkyl radical, R.sup.1 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, Y is a ##STR49## radical where R.sup.2 and R.sup.3 are selected from the group consisting of hydrogen, a C.sub.(1-12) alkyl, alkenyl, alkylester, alkylether, aryl, alkaryl and a aralkyl radical, n is a whole number that varies from 2 to 4 and 6, 7, 8, b is a whole number equal to 0 or 1, e is a whole number equal to 0 to 1 inclusive, and the sum of b+e is equal to 0 or 1 inclusive, and s is an integer having a value of from about 50 to about 2500 inclusive, c is a whole number equal to 0 to 3 inclusive, f is an integer equal to 1 to 4 inclusive and the sum of c+f is equal to 1 to 4 inclusive.
- 14. A room temperature vulcanizable polyalkoxy-terminated organopolysiloxane composition in accordance with claim 13, containing an effective amount of a curing accelerator selected from the group consisting of substituted quanidines, amines, and mixtures thereof.
- 15. A one-package room temperatature vulcanizable composition in accordance with claim 13, where R.sup.4, R and R.sup.1 are methyl.
- 16. A one-package room temperature vulcanizable composition in accordance with claim 13, where the condensation catalyst is a tin compound.
- 17. A stable and substantially acid-free, one-package, room temperature vulcanizable composition comprising a polymethoxy-terminated polydimethylsiloxane, a polymethoxysilane, an effective amount of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof, an effective amount of a tin compound condensation catalyst, and a stabilizing amount of a silane scavenger for hydroxy functional groups having at least one hydrolyzable leaving group having the formula ##STR50## where Y is a ##STR51## radical, R.sup.2 and R.sup.3 are selected from the group consisting of hydrogen, C.sub.(1-12) alkyl, alkenyl, alkylester, alkylether, aryl, alkaryl and an aralkyl radical, and n is a whole number that varies from 2 to 4 and 6, 7, 8.
- 18. A one-package room temperature vulcanizable composition in accordance with claim 17, where the polymethoxysilane is methyltrimethoxysilane.
- 19. A one-package RTV in accordance with claim 17, where the substituted guanidine is butyltetramethylguanidine.
- 20. A one-package RTV in accordance with claim 17, where the organic amine is a dialkylamine.
- 21. A substantially acid-free room temperature vulcanizable composition comprising methyldimethoxysiloxy terminated polydimethylsiloxane, a reinforcing amount of octamethylcyclotetrasiloxane treated silica filler, an effective amount of dibutyltindiacetate condensation catalyst, a cure accelerating amount of trimethoxysilylpropyltetramethylguanidine and an excess of up to 3% by weight, based on the weight of the polydimethylsiloxane of methyldimethoxy-2-pyrrolidonosilane.
- 22. A room temperature vulcanizable composition in accordance with claim 21, having up to 10 parts of methyltrimethoxysilane per 100 parts of the polydimethylsiloxane.
- 23. A method of making a one-package 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.degree. C. to 180.degree. 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 ##STR52## (b) a stabilizing amount of a silane scavenger for hydroxy functional groups of the formula ##STR53## (c) 0 to 10 parts of cross-linking silane of the formula ##STR54## (d) an effective amount of a condensation catalyst, and (e) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted quanidines, amines and mixtures thereof; and
- (ii) a mixture comprising
- (a) 100 parts of a polyalkoxy-terminated polydiorganosiloxane of the formula ##STR55## (b) 0 to 10 parts of a cross-linking silane of the formula ##STR56## (c) an effective amount of a condensation catalyst, (d) a stabilizing amount of a silane scavenger for hydroxy functional groups having the formula ##STR57## and, (e) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof;
- where R.sup.4 is selected from C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radicals, R is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) alkaryl radical, R.sup.1 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, y is a ##STR58## radical where R.sup.2, R.sup.3 are selected from the class consisting of hydrogen, C.sub.(1-12) alkyl, alkenyl, alkylester, alkylether, aryl, alkaryl and an aralkyl radical, n is a whole number that varies from 2 to 4 and 6, 7, 8 and, a is an integer equal to 1 or 2, b is a whole number equal to 0 or 1, and the sum of a+b is equal to 1 or 2, e is a whole number equal to 0 or 1 and the sum of b+e is equal to 0 to 1, s is an integer having a value of from about 50 to about 2500 inclusive, c is a whole number equal to 0 to 3 inclusive, f is an integer equal to 1 to 4 inclusive and the sum of c+f is equal to 1 to 4 inclusive.
- 24. A method in accordance with claim 23, where R.sup.4, R and R.sup.1 are methyl.
- 25. A method in accordance with claim 23, where the curing accelerator is selected from the group consisting of silylated guanidine and alkyl guanidine.
- 26. A method in accordance with claim 23, where the scavenging silane is a polymethoxy-2-pyrrolidone.
- 27. A method in accordance with claim 23, where the cross-linking silane is methyltrimethoxysilane.
- 28. A method in accordance with claim 23, where the condensation catalyst is a tin compound.
- 29. A mixture comprising
- (a) 100 parts of a silanol-terminated polydiorganosiloxane consisting essentially of chemically combined units of the formula ##STR59## (b) a stabilizing amount of a silane scavenger for hydroxy functional groups of the formula ##STR60## (c) 0 to 10 parts of cross-linking silane of the formula ##STR61## (d) an effective amount of a condensation catalyst, and (e) 0 to 5 parts of a curing accelerator selected from the group consisting of substituted guanidines, amines and mixtures thereof;
- where R.sup.4 is selected from C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radicals, R is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) aralkyl radical, R.sup.1 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, Y is a ##STR62## radical where R.sup.2 and R.sup.3 are selected from the group consisting of hydrogen, a C.sub.(1-12) alkyl, alkenyl, alkylester, alkylether, aryl, alkaryl and an aralkyl radical, n is a whole number that varies from 2 to 4 and 6, 7, 8, and a is an integer equal to 1 or 2, b is a whole number equal to 0 or 1, and the sum of a+b is equal to 1 or 2.
- 30. In the method of making a substantially acid-free room temperature vulcanizable organopolysiloxane composition under substantially anhydrous conditions utilizing an effective amount of a condensation catalyst with a silanol-terminated organopolysiloxane and a polyalkoxysilane cross-linking agent, the improvement which comprises adding to the silanol-terminated organopolysiloxane a stabilizing amount of a polyalkoxysilane which is both a scavenger for hydroxy functional groups and a cross-linking agent of the formula ##STR63## where R is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) aralkyl radical, R.sup.1 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, Y is a ##STR64## radical, where R.sup.2 and R.sup.3 are selected from the group consisting of hydrogen, a C.sub.(1-12) alkyl, alkenyl, alkylester, alkylether, aryl, alkaryl and an aralkyl radical, and n is a whole number that varies from 2 to 4 and 6, 7, 8, a is an integer equal to 1 or 2, b is an integer equal to 0 or 1, and the sum of a+b is equal to 1 or 2, and thereafter adding an effective amount of a condensation catalyst, whereby improved stability is achieved in the resulting room temperature vulcanizable organopolysiloxane composition.
- 31. A method in accordance with claim 30, where the silane scavenger is methyldimethoxy-2-pyrrolidonosilane.
- 32. A method in accordance with claim 30, using an effective amount of dibutyltindiacetate as the condensation catalyst.
- 33. In the method of making a substantially acid-free room temperature vulcanizable organopolysiloxane composition under substantially anhydrous conditions utilizing an effective amount of a condensation catalyst with an organopolysiloxane wherein the silicon atom at each polymer chain end is terminated with at least two alkoxy radicals, the improvement which comprises adding to said polyalkoxy-terminated organopolysiloxane (1) a stabilizing amount of a silane scavenger for hydroxy functional groups of the formula ##STR65## where R is a C.sub.(1-8) aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano radicals, or a C.sub.(7-13) aralkyl radical, R.sup.1 is a C.sub.(1-13) monovalent substituted or unsubstituted hydrocarbon radical, Y is a ##STR66## radical where R.sup.2 and R.sup.3 are selected from the group consisting of hydrogen, a C.sub.(1-12) alkyl, alkenyl, alkylester, alkylether, aryl, alkaryl and an aralkyl radical, and n is a whole number that varies from 2-4 and 6, 7, 8, and c is a whole number equal to 0 to 3 inclusive, f is an integer equal to 1 to 4 inclusive, and the sum of c+f is equal to 1 to 4 inclusive, and (2) an effective amount of a condensation catalyst, whereby improved stability is achieved in the resulting room temperature vulcanizable organopolysiloxane composition.
- 34. A method in accordance with claim 33, where the silane scavenger is methyldimethoxy-2-pyrrolidonosilane.
- 35. A method in accordance with claim 33, utilizing a stabilizing amount of methyldimethoxy-2-pyrrolidonosilane and an effective amount of methyltrimethoxysilane.
- 36. A method in accordance with claim 33, using an effective amount of dibutyltindiacetate as the condensation catalyst.
Parent Case Info
This application is a division, of application Ser. No. 338,518, filed Jan. 11, 1982, now U.S. Pat. No. 4,424,157.
US Referenced Citations (3)
Divisions (1)
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Number |
Date |
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Parent |
338518 |
Jan 1982 |
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