Claims
- 1. 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:
- (A) an organopolysiloxane wherein the silicon atom at each polymer chain end is terminated with at least two alkoxy radicals;
- (B) an effective amount of condensation catalyst; and
- (C) a stabilizing amount of scavenger for hydroxy functional groups selected from the group consisting of: ##STR20## divinyltetramethoxydisilazane, 1-Methyl-3-ethyl-1,1,3,3-tetramethoxydisilazane,
- 1,3-Diethyl-1,1,3,3-tetramethoxydisilazane,
- 1-Methyl-3-propyl-1,1,3,3-tetramethoxydisilazane,
- 1-Ethyl-3-propyl-1,1,3,3-tetramethoxydisilazane,
- 1,3-Dipropyl-1,1,3,3-tetramethoxydisilazane,
- 1,1,3-Trimethyl-1,3,3-trimethoxydisilazane,
- 1,1-Dimethyl-3-ethyl-1,3,3-trimethoxydisilazane,
- 1,1-Dimethyl-3-propyl-1,3,3-trimethoxydisilazane,
- 1,1-Dimethyl-3-butyl-1,3,3-trimethoxydisilazane,
- 1,1-Diethyl-3-methyl-1,3,3-trimethoxydisilazane,
- 1,1-Dipropyl-3-methyl-1,3,3-trimethoxydisilazane,
- 1,1-Dibutyl-3-methyl-1,3,3-trimethoxydisilazane,
- 1,1,3-Trimethyl-1,3,3-trimethoxydisilazane,
- 1,1,3-Triethyl-1,3,3-trimethoxydisilazane,
- 1,1,3-Tripropyl-1,3,3-Trimethoxydisilazane,
- 1,1-Dimethyl-1,3,3,3-Tetramethoxydisilazane,
- 1,1-Diethyl-1,3,3,3-Tetramethoxydisilazane,
- 1,1-Dipropyl-1,3,3,3-Tetramethoxydisilazane,
- 1. 3-Dimethyl-1-ethoxyl -1,3,3-trimethoxydisilazane,
- 1,3-Diethyl-1-ethoxy-1,3,3-trimethoxydisilazane,
- and cyclic silazane scavengers having at least one or all of the units of the formula: ##STR21## and the rest of the units, if any, having the formula: ##STR22## where h is 0 or 1, R.sup.12 is a C.sub.1-8 aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone, alkyl cyano, and aryl and R.sup.13 and R.sup.14 is a C.sub.1-8 monovalent substituted or unsubstituted hydrocarbon radical.
- 2. 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:
- (A) an organopolysiloxane wherein the silicon atom at each polymer chain end is terminated with at least two alkoxy radicals;
- (B) an effective amount of condensation catalyst; and
- (C) a stabilizing amount of scavenger for hydroxy functional groups selected from the group consisting of: ##STR23## divinyltetramethoxydisilazane, 1-Methyl-3-ethyl-1,1,3,3-tetramethoxydisilazane,
- 1,3-Diethyl-1,1,3,3-tetramethoxydisilazane,
- 1-Methyl-3-propyl-1,1,3,3-tetramethoxydisilazane,
- 1-Ethyl-3-propyl-1,1,3,3-tetramethoxydisilazane,
- 1,3-Dipropyl-1,1,3,3-tetramethoxydisilazane,
- 1,1,3-Trimethyl-1,3,3-trimethoxydisilazane,
- 1,1-Dimethyl-3-ethyl-1,3,3-trimethoxydisilazane,
- 1,1-Dimethyl-3-propyl-1,3,3-trimethoxydisilazane,
- 1,1-Dimethyl-3-butyl-1,3,3-trimethoxydisilazane,
- 1,1-Diethyl-3-methyl-1,3,3-trimethoxydisilazane,
- 1,1-Dipropyl-3-methyl-1,3,3-trimethoxydisilazane,
- 1,1-Dibutyl-3-methyl-1,3,3-trimethoxydisilazane,
- 1,1,3-Trimethyl-1,3,3,-trimethoxydisilazane,
- 1,1,3-Triethyl-1,3,3-trimethoxydisilazane,
- 1,1,3-Tripropyl-1,3,3-Trimethoxydisilazane,
- 1,1-Dimethyl-1,3,3,3-Tetramethoxydisilazane,
- 1,1-Diethyl-1,3,3,3-Tetramethoxydisilazane,
- 1,1-Dipropyl-1,3,3,3-Tetramethoxydisilazane,
- 1,3-Dimethyl-1-ethoxyl -1,3,3-trimethoxydisilazane,
- 1,3-Diethyl-1-ethoxy-1,3,3-trimethoxydisilazane,
- and cyclic silazane scavengers having at least one or all of the units of the formula: ##STR24## and the rest of the units, if any, having the formula: ##STR25## where h is 0 or 1, R.sup.12 is a C.sub.1-8 aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone, alkyl cyano, and aryl and R.sup.13 and R.sup.14 is a C.sub.1-8 monovalent substituted or unsubstituted hydrocarbon radical and
- (D) an effective amount of a curing accelerator consisting of an amine or mixture of amine.
- 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:
- (A) 100 parts of substantially silanol-free polyalkoxysiloxydiorganopolysiloxane of the formula: ##STR26## wherein R is selected from C.sub.1-13 monovalent hydrocarbon radicals, halogenated hydrocarbon radicals or cyanoalkyl radicals; R.sup.1 is selected from C.sub.1-8 alkyl radicals or C.sub.7-13 aralkyl radicals; R.sup.2 is selected from methyl, phenyl or vinyl; X is a silazane leaving group; e is 0 or 1 and b+e is 0 or 1,
- (B) 0 to 10 parts of a cross-linking polyalkoxy silane of the formula: ##STR27## where R.sup.1 and R.sup.2 are defined above and b is 0 or 1, (C) an effective amount of a condensation catalyst,
- (D) a stabilizing amount of scavenger for hydroxy functional groups selected from the group consisting of: ##STR28## and cyclic silazanes scavengers having at least one or all of the units of the formula: ##STR29## and the rest of the units, if any, having the formula: ##STR30## where h is 0 or 1, R.sup.12 is a C.sub.1-8 aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone, alkyl cyano, and aryl and R.sup.13 and R.sup.14 is a C.sub.1-8 monovalent substituted or unsubstituted hydrocarbon radical; and
- (E) 0.1 to 5 parts of a curing accelerator consisting of an amine or mixture of amines.
- 4. 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:
- (A) an organopolysiloxane wherein the silicon atom at each polymer chain end is terminated with at least two alkoxy radicals;
- (B) an effective amount of condensation catalyst; and
- (C) a stabilizing amount of scavenger for hydroxy functional groups having the general formula: ##STR31## wherein R.sup.10 is a C.sub.1-8 aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano or aryl; R.sup.11 is a C.sub.1-8 monovalent substituted or unsubstituted hydrocarbon radical; Q is selected from hydrogen, C.sub.1-8 monovalent substituted hydrocarbon radicals or radicals of the formula: ##STR32## where R.sup.10 and R.sup.11 are as previously defined; a varies from 0 to 2; f varies from 0 to 3; s is a whole number that varies from 1 to 25; d is a whole number that varies from 1 to 25; R.sup.22 is selected from hydrogen or C.sub.1-8 monovalent hydrocarbon radicals; R.sup.23 is independently selected from C.sub.1-8 hydrocarbon or hydrocarbonoxy radicals; A is a radical of the formula: ##STR33## where R.sup.10 and R.sup.11 are as previously defined; g varies from 0 to 3; and in the above scavengers there is at least one hydrocarbonoxy group in the molecule.
- 5. 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:
- (A) an organopolysiloxane wherein the silicon atom at each polymer chain end is terminated with at least two alkoxy radicals;
- (B) an effective amount of condensation catalyst; and
- (C) a stablizing amount of scavenger for hydroxy functional groups having the general formula: ##STR34## where R.sup.10 is a C.sub.1-8 aliphatic organic radical selected from the group consisting of alkyl, alkylether, alkylester, alkylketone and alkylcyano or aryl; R.sup.11 is a C.sub.1-8 monovalent substituted or unsubstituted hydrocarbon radical; Q is a radical of the formula: ##STR35## where R.sup.10 and R.sup.11 are as previously defined; a varies from 0 to 2; f varies from 0 to 3; s is a whole number that varies from 1 to 25; d is a whole number that varies from 1 to 25; R.sup.22 is selected from hydrogen or C.sub.1-8 monovalent hydrocarbon radicals; R.sup.23 is independently selected from C.sub.1-8 hydrocarbon or hydrocarbonoxy radicals; A is selected from the group consisting of hydrogen, C.sub.1-8 monovalent substituted hydrocarbon radicals, C.sub.1-8 monovalent unsubstituted hydrocarbon radicals and radicals of the formula: ##STR36## where R.sup.10 and R.sup.11 are as previously defined; g varies from 0 to 3; and in the above scavengers there is at least one hydrocarbonoxy group in the molecule.
- 6. The composition of claim 1 wherein the scavenger is a cyclic silazane where R.sup.12, R.sup.13, and R.sup.14 are methyl.
- 7. The composition of claim 2 wherein the scavenger is a cyclic silazane where R.sup.12, R.sup.13, and R.sup.14 are methyl.
- 8. A one-package, room temperature vulcanizable organopolysiloxane composition in accordance with claim 1, where the polyalkoxy-terminated organopolysiloxane has the formula, ##STR37## where R is a C.sub.1-13 monovalent substituted or unsubstituted hydrocarbon radical, R.sup.1 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.2 is a C.sub.1-13 monovalent substituted or unsubstituted hydrocarbon radical, X is a silazane hydrolyzable leaving group, and b is a whole number equal to 0 or 1, e is a whole number equal to 1 or 1 inclusive, and the sum of b+e is equal to 0 or 1 inclusive, and n is an integer having a value of from about 50 to about 2500, inclusive.
- 9. A room temperature vulcanizable composition in accordance with claim 1 having an effective amount of a cross-linking silane of the formula, ##STR38## where R.sup.1 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.2 is a C.sub.1-13 monovalent substituted or unsubstituted hydrocarbon radical, and b is a whole number equal to 0 or 1.
- 10. A room temperature vulcanizable composition in accordance with claim 1, which contains a tin compound as the condensation catalyst.
- 11. A room temperature vulcanizable composition in accordance with claim 8, where R, R.sup.1 and R.sup.2 are methyl and which has a tin compound as a condensation catalyst.
- 12. An RTV composition in accordance with claim 2 wherein the condensation catalyst is dibutyltindiacetate.
- 13. An RTV composition in accordance with claim 2 further comprising a polymethoxysilane cross-linking agent.
- 14. The composition of claim 3 wherein the scavenger is a cyclic silazane where R.sup.12, R.sup.13, and R.sup.14 are methyl.
- 15. A one-package room temperaure vulcanizable composition in accordance with claim 3 wherein R, R.sup.1 and R.sup.2 are methyl.
- 16. A one-package room temperature vulcanizable composition in accordance with claim 3 wherein the condensation catalyst is a tin compound.
- 17. A one-package room temperature vulcanizable composition in accordance with claim 3 where the polyalkoxysilane is methyltrimethoxysilane.
- 18. A one-package RTV composition in accordance with claim 3 where the amine is butyltetramethylguanidine.
- 19. A composition in accordance with claim 3 where the condensation catalyst is dibutyltindiacetate.
- 20. A room temperature vulcanizable composition in accordance with claim 18 having an effective amount of di-n-hexylamine curing accelerator.
Parent Case Info
This application is a division of application Ser. No. 912,641, filed 09/25/86, now U.S. Pat. No. 4,720,531, which is a continuation of Ser. No. 428,038, filed 09/29/82, now abandoned.
US Referenced Citations (14)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1581856 |
Dec 1980 |
GB2 |
Non-Patent Literature Citations (2)
Entry |
Chemistry of Organic Compounds Relevant to the meaning of guanidine, Carl R. Noller 3rd Edition 1965. |
An Introduction to the Chemistry Relevant to the meaning of silazane, of the Silicones E. R. Rochow 2nd Edition (date unavailable). |
Divisions (1)
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Number |
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Parent |
912641 |
Sep 1986 |
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Continuations (1)
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428038 |
Sep 1982 |
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