Claims
- 1. A method for improving adhesion to a substrate of a room temperature vulcanizable composition comprising a polyalkoxy-terminated polydioganosiloxane and a catalytic amount of a curing catalyst, said method comprising incorporating therein an adhesion improving amount of a cyclic aminoalkysilane having the formula ##STR8## wherein R.sup.1 is C.sub.1-8 alkyl, each R.sup.2 is independently hydrogen or C.sub.1-4 primary or secondary alkyl, R.sup.3 is methyl or ethyl and n is 2 or 3.
- 2. A method according to claim 1 wherein the substrate is aluminum or steel.
- 3. A method according to claim 2 wherein about 0.1-5.0 parts by weight of said compound is employed per 100 parts of said polydiorganosiloxane.
- 4. A method according to claim 3 wherein R.sup.1 is methyl, R.sup.2 is hydrogen, R.sup.3 is methyl and n is 3.
- 5. A room temperature vulcanizable composition comprising (A) at least one polyalkoxy-terminated polydiorganosiloxane, (B) a catalytic amount of a curing catalyst, and (C) an amount of effective to enhance adhesion to a substrate of a cyclic aminoalkylsilane having the formula ##STR9## wherein R.sup.1 is C.sub.1-8 alkyl, each R.sup.2 is independently hydrogen or C.sub.1-4 primary of secondary alkyl, R.sup.3 is methyl or ethyl and n is 2 or 3.
- 6. A composition according to claim 5 wherein component B is an aluminum, titanium or tin compound and is employed in the amount of about 0.1-10.0 parts by weight per 100 parts of component A.
- 7. A composition according to claim 6 wherein component B is an organotin complex of the formula ##STR10## wherein R.sup.7 is an unsubstituted or substituted hydrocarbon radical containing from 1 to about 18 carbon atoms and each of R.sup.8, R.sup.9 and R .sup.10 is independently hydrogen, R.sup.7, Si(R.sup.7).sub.3, acyl or nitrile.
- 8. A composition according to claim 7 wherein about 0.1-10.0 parts of component B and about 0.1-5.0 parts of component C are employed per 100 parts of component A.
- 9. A composition according to claim 8 which also comprises at least one of the following, all proportions being per 100 parts of component A:
- (E) about 0.05-5.0 parts of a diketone of the formula ##STR11## (F) about 0.01-10.0 parts of at least one polyalkoxysilane of the formula
- . .(R.sup.4).sub.a Si(OR.sup.5).!. (.Iadd.R.sup.4).sub.a Si(OR.sup.5).sub.4-a .Iaddend. (VII)
- wherein R.sup.4 is an unsubstituted or substituted hydrocarbon radical containing from 1 to about 13 carbon atoms, R.sup.5 is an alkyl, alkoxyalkyl, acylalkyl, acyloxyalkyl or cyanoalkyl radical containing from 1 to about 8 carbon atoms or an aralkyl radical containing from . .1.!. .Iadd.7 .Iaddend.to about 14 carbon atoms, and a is 0 or 1;
- (G) about 1-50 parts of a plasticizer;
- (H) about 5-700 parts of at least one filler; and
- (J) about 0.1-5.0 parts of an amine or guanidine as a curing accelerator.
- 10. A composition according to claim 9 wherein R.sup.4, R.sup.5 and R.sup.6 are each methyl.
- 11. A composition according to claim 10 which also comprises (D) a cyanoalkyltrialkoxysilane in the amount of about 0.1-5.0 parts per 100 pans of component A.
- 12. A composition according to claim 11 wherein R.sup.7 is butyl, R.sup.8 and R 10 are each methyl and R.sup.9 is hydrogen.
- 13. A composition according to claim 12 which also comprises components E, F and G, wherein component G is at least one trialkylsilyl-terminated polydiorganosiloxane of the formula ##STR12## wherein R.sup.6 is an unsubstituted or substituted hydrocarbon radical containing about 1-13 carbon atoms.
- 14. A composition according to claim 6 wherein component A is represented by the formula ##STR13## wherein R.sup.4 is an unsubstituted or substituted hydrocarbon radical containing from 1 to about 13 carbon atoms, R.sup.5 is an alkyl, alkoxyalkyl, acylalkyl, acyloxyalkyl or cyanoalkyl radical from 1 to about 8 carbon atoms or an arylalkyl radical containing from . .1.!. .Iadd.7 .Iaddend. to about 14 carbon atoms, each R.sup.6 is independently an unsubstituted or substituted hydrocarbon radical containing about 1-13 carbon atoms, a is 0 or 1 and m is in the range of about 5-5000.
Parent Case Info
This application is a division of application Ser. No. 070,009, filed Jul. 6, 1987, now U.S. Pat. No. 4,794,192.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4358575 |
Lampe et al. |
Nov 1982 |
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4503179 |
Yoshimura et al. |
Mar 1985 |
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4794192 |
Stein |
Dec 1988 |
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Divisions (1)
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Number |
Date |
Country |
Parent |
70009 |
Jul 1987 |
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Reissues (1)
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Number |
Date |
Country |
Parent |
234730 |
Aug 1988 |
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