US4788170A
Expired / Lapsed
US
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Method for preparing tin complex curing catalyst
Assignee: General Electric Co
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Filing: 1987-07-06
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Granted: 1988-11-29
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Expires: 2007-07-06
Abstract
Abstract Catalysts containing tin complexes such as dibutyltin bis(acetylacetonate), useful as curing catalysts for room temperature vulcanizable compositions, are prepared by the reaction of a dialkyltin oxide with a dione and a polyalkoxysilane at a temperature in the range of about 20°-80° C. At least 2 moles of dione and preferably at least 2 moles of polyalkoxysilane are employed per gram-atom of tin. The polyalkoxysilane removes water of reaction, driving the reaction to completion.
Inventors
- 👤 Jeffrey H. Wengrovius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:12
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/16; B01J31/22; B01J31/2204; B01J31/2208; B01J31/2226; B01J31/223; B01J31/2234; B01J31/02; B01J31/12; B01J31/122; C; C07; C07F; C07F7/00; C07F7/22; C07F7/2224; B01J2531/00; B01J2531/40; B01J2531/42
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
131 words
A method for preparing a tin complex condensation catalyst which comprises effecting reaction, at a temperature in the range of about 20°-120° C., between the constitutents of a mixture comprising: (A) at least one dialkyltin oxide; (B) at least 2 moles, per gram-atom of tin in reagent A, of a diene of the formula ##STR6## wherein each of R 1 , R 2 and R 3 is independently hydrogen, R 4 , Si(R 4 ) 3 , acyl or nitrile and R 4 is a hydrocarbon radical containing from 1 to about 18 carbon atoms, and (C) at least 1 mole, per gram-atom of tin in reagent A, of at least one polyalkoxysilane; whereby water formed in the reaction between reagents A and B is removed by reaction with reagent C.
Claim 2
Independent Claim
131 words
A method for preparing a tin complex condensation catalyst which comprises effecting reaction, at a temperature in the range of about 20°-120° C., between the constitutents of a mixture comprising: (A) at least one dialkyltin oxide; (B) at least 2 moles, per gram-atom of tin in reagent A, of a diene of the formula ##STR6## wherein each of R 1 , R 2 and R 3 is independently hydrogen, R 4 , Si(R 4 ) 3 , acyl or nitrile and R 4 is a hydrocarbon radical containing from 1 to about 18 carbon atoms, and (C) at least 1 mole, per gram-atom of tin in reagent A, of at least one polyalkoxysilane; whereby water formed in the reaction between reagents A and B is removed by reaction with reagent C.
Claim 3
Dependent Claim
24 words
A method according to claim 1 wherein at least about 2 moles of reagent C is present per gram-atom of tin in reagent A.
Claim 4
Dependent Claim
19 words
A method according to claim 2 wherein R 1 and R 3 are alkyl and R 2 is hydrogen.
Claim 5
Dependent Claim
26 words
A method according to claim 3 wherein the ratio of moles of reagent B to gram-atoms of tin in reagent A is up to about 6:1.
Claim 6
Dependent Claim
26 words
A method according to claim 4 wherein the ratio of moles of reagent C to gram-atoms of tin in reagent A is up to about 10:1.
Claim 7
Dependent Claim
11 words
A method according to claim 5 wherein reagent B is acetylacetone.
Claim 8
Dependent Claim
11 words
A method according to claim 6 wherein reagent C is methyltrimethoxysilane.
Claim 9
Dependent Claim
24 words
A method according to claim 7 wherein the ratio of moles of reagent B to gram-atoms of tin in reagent A is about 3-5.5:1.
Claim 10
Dependent Claim
24 words
A method according to claim 8 wherein the ratio of moles of reagent C to gram-atoms of tin in reagent A is about 7-8.5:1.
Claim 11
Dependent Claim
12 words
A method according to claim 9 wherein reagent A is di-n-butyltin oxide.
Claim 12
Dependent Claim
12 words
A method according to claim 9 wherein reagent A is di-n-octyltin oxide.
Claim 13
Dependent Claim
18 words
A method according to claim 9 wherein the reaction temperature is in the range of about 60°-110° C.
References Cited (Backward Citations)
US4517337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |