Patent EP0395428A2 successfully refreshed from Google Patents.
US4137249A
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Silicon-tin compounds
Assignee: Wacker Chemie AG
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Filing: 1976-05-27
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Granted: 1979-01-30
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Expires: 1996-05-27
Abstract
Abstract Silicon-tin compounds of the formula R.sub.a Si(OSnR.sup.1 R.sup.2 OOCR.sup.3).sub.4-a in which R represents an alkyl or phenyl radical, R 1 , R 2 and R 3 are alkyl radicals and a is 0 or 1 and their use as condensation catalysts in the preparation of organopolysiloxane elastomers.
Inventors
- 👤 Ernst Wohlfarth
- 👤 Wolfgang Hechtl
- 👤 Paul Hittmair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:42
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/08; C07; C07F; C07F7/00; C07F7/02; C07F7/04; C07F7/08; C07F7/0834; C07F7/0836; C07F7/22; C07F7/2224; C08K; C08K5/00; C08K5/56; C08K5/57
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
91 words
A crystalline compound of the general formula R.sub.a Si(OSnR.sup.1 R.sup.2 OOCR.sup.3).sub.4-a which is obtained from the reaction of a silane having the formula R.sub.a Si(OR.sup.4).sub.4-a with a dialkyltin salt of the formula R.sup.1 R.sup.2 Sn(OOCR.sup.3).sub.2, in a mol ratio of (4-a) mols of dialkyltin salt per mol of silane, R is an alkyl radical having up to 4 carbon atoms, R 1 , R 2 and R 3 , each represent an alkyl radical, R 4 is a monovalent hydrocarbon radical having up to 4 carbon atoms and a is 1.
Claim 2
Dependent Claim
91 words
A crystalline compound of the general formula R.sub.a Si(OSnR.sup.1 R.sup.2 OOCR.sup.3).sub.4-a which is obtained from the reaction of a silane having the formula R.sub.a Si(OR.sup.4).sub.4-a with a dialkyltin salt of the formula R.sup.1 R.sup.2 Sn(OOCR.sup.3).sub.2, in a mol ratio of (4-a) mols of dialkyltin salt per mol of silane, R is an alkyl radical having up to 4 carbon atoms, R 1 , R 2 and R 3 , each represent an alkyl radical, R 4 is a monovalent hydrocarbon radical having up to 4 carbon atoms and a is 1.
Claim 3
Dependent Claim
11 words
The compound of claim 1, wherein R is a methyl radical.
Claim 4
Dependent Claim
29 words
The compound of claim 1, wherein each radical represented by R 1 and each radical represented by R 2 is an alkyl radical having up to 18 carbon atoms.
Claim 5
Dependent Claim
32 words
The compound of claim 1, wherein each radical represented by R 1 and each radical represented by R 2 is selected from the group consisting of methyl, n-butyl, n-octyl and 2-ethylhexyl radicals.
Claim 6
Dependent Claim
14 words
The compound of claim 1, wherein R 1 and R 2 represent identical radicals.
Claim 7
Dependent Claim
22 words
The compound of claim 1, wherein each radical represented by R 3 is an alkyl radical having up to 4 carbon atoms.
Claim 8
Dependent Claim
16 words
The compound of claim 1, wherein each radical represented by R 3 is a methyl radical.
Claim 9
Dependent Claim
18 words
A compound of the formula CH 3 Si[OSn(n-C 4 H 9 ) 2 OOCCH 3 ] 3 .
Claim 10
Dependent Claim
18 words
A compound of the formula CH 3 Si[OSn(n-C 4 H 9 ) 2 OOCCH 3 ] 3 .
Claim 11
Dependent Claim
20 words
A compound of the formula C 6 H 5 Si[OSn(n-C 4 H 9 ) 2 OOCCH 3 ] 3 .
Claim 12
Dependent Claim
20 words
A compound of the formula C 6 H 5 Si[OSn(n-C 4 H 9 ) 2 OOCCH 3 ] 3 .
Claim 13
Dependent Claim
36 words
A mixture containing at least two compounds of claim 1, in which at least 90 percent of each of the radicals represented by R, R 1 , R 2 , and R 3 respectively are identical.
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) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |