US4873305A
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Tin monochelate catalysis of organopolysiloxane compositions
Assignee: Rhodia Chimie SAS
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Filing: 1988-06-27
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Granted: 1989-10-10
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Expires: 2008-06-27
Abstract
Abstract Organopolysiloxane compositions curable into elastomeric state, whether in single- or two-component form, comprise an α,ω-dihydroxypolydiorganopolysiloxane oil, a crosslinking agent therefor, optionally, inorganic fillers and an adhesion promoter, and a catalytically effective amount of a pentacoordinated tin monochelate produced by reacting a tin oxide with a β-dicarbonyl compound and a carboxylic acid.
Inventors
- 👤 Jacques Cavezzan
- 👤 Jean-Marc Frances
- 👤 Claude Millet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:09
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/56; C08K5/57; C07; C07F; C07F7/00; C07F7/22; C07F7/2224; Y; Y10; Y10S; Y10S528/00; Y10S528/901
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
199 words
An organopolysiloxane composition of matter curable into elastomeric state, comprising (1) a curable organopolysiloxane base including an organopolysiloxane polymer and a crosslinking agent therefor, and (2) a catalytically effective amount of a monochelate of pentacoordinated tin of valency IV having the formula: ##STR4## in which: the symbols R 1 and R 2 , which may be identical or different, are each an optionally substituted, monovalent C 1 -C 8 hydrocarbon radical; the symbols R 3 and R 5 , which may be identical or different, are each a radical R 1 or R 2 , a hydrogen atom, a C 1 -C 5 alkoxy radical or a silyl radical Si(R 1 ) 3 ; the symbol R 4 is hydrogen atom, or an optionally halogented C 1 -C 8 hydrocarbon radical, with the proviso that R 4 and R 5 may together form, with the carbon atoms from which they depend, a divalent C 5 -Clhd 12 cyclic hydrocarbon radical or a substituted such radical bearing at least one chlorine, nitro and/or cyano substituent; and the symbol X is a monocarboxylate radical of the formula R 6 COO wherein R 6 has the same definition as R 1 above
Claim 2
Dependent Claim
199 words
An organopolysiloxane composition of matter curable into elastomeric state, comprising (1) a curable organopolysiloxane base including an organopolysiloxane polymer and a crosslinking agent therefor, and (2) a catalytically effective amount of a monochelate of pentacoordinated tin of valency IV having the formula: ##STR4## in which: the symbols R 1 and R 2 , which may be identical or different, are each an optionally substituted, monovalent C 1 -C 8 hydrocarbon radical; the symbols R 3 and R 5 , which may be identical or different, are each a radical R 1 or R 2 , a hydrogen atom, a C 1 -C 5 alkoxy radical or a silyl radical Si(R 1 ) 3 ; the symbol R 4 is hydrogen atom, or an optionally halogented C 1 -C 8 hydrocarbon radical, with the proviso that R 4 and R 5 may together form, with the carbon atoms from which they depend, a divalent C 5 -Clhd 12 cyclic hydrocarbon radical or a substituted such radical bearing at least one chlorine, nitro and/or cyano substituent; and the symbol X is a monocarboxylate radical of the formula R 6 COO wherein R 6 has the same definition as R 1 above
Claim 3
Dependent Claim
89 words
An organopolysiloxane composition of matter curable into elastomeric state, comprising (1) a curable organopolysiloxane base including an organopolysiloxane polymer and a crosslinking agent therefor, and (2) a catalytically effective amount of the product of a process for the preparation of a tin monochelate of the formula (1) as defined by claim 1, comprising reacting a tin oxide of the formula: R.sub.1 R.sub.2 SnO (2) with a β-dicarbonyl compound of the formula: ##STR5## and with an organic carboxylic acid of the formula: XH (4) and removing the water of reaction.
Claim 4
Dependent Claim
123 words
The organopolysiloxane composition as defined by claims 1 or 2 wherein said curable organopolysiloxane base comprises: (A) 100 parts by weight of an α,ω-dihydroxypolydiorganosiloxane polymer having a viscosity of 500 to 1,000,000 mFa.s and which comprises recurring units of the formula (R 2 )SiO where the symbols R, which may be identical or different, are hydrocarbon radicals containing from 1 to 10 carbon atoms, optionally substituted by at least one halogen atom or cyano radical; (B) 0.5 to 20 parts by weight of an organosilicon compound crosslinking agent containing more than two hydrolyzable groups bonded to silicon atoms, per molecule; (C) 0 to 250 parts by weight of inorganic filler material; and (D) 0 to 20 parts by weight of an adhesion promoter.
Claim 5
Dependent Claim
56 words
The organopolysiloxane composition as defined by claim 3, comprising a silane crosslinking agent (B) of the formula: R.sub.a Si(Z).sub.4-a ( 6) in which R is a hydrocarbon radical containing from 1 to 10 carbon atoms and Z is N-substituted amino, N-substituted amido, N,N-disubstituted aminoxy, ketiminoxy, aloxy, aloxyalkylenoxy, enoxy or acyloxy, and a is 0 to 1.
Claim 6
Dependent Claim
14 words
The organopolysiloxane composition as defined by claims 1 or 2, in a single-component form.
Claim 7
Dependent Claim
13 words
The organopolysiloxane composition as defined by claims 1 or 2, in two-component form.
References Cited (Backward Citations)
US4517337A
Cited
US4554310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-10-09 | 1993-04-10 | 1993-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-09 | 1997-04-10 | 1997-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-09 | 2001-04-10 | 2001-10-10 | $7700.00 | Window Closed / Lapsed |