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US4929702A
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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: 1990-05-29
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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 alpha , omega -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 bischelate with an organic carboxylic acid.
Inventors
- 👤 Jacques Cavezzan
- 👤 Jean-Marc Frances
- 👤 Pierre Lancelin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:14
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/56; C08K5/57; Y; Y10; Y10S; Y10S528/00; Y10S528/901
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
236 words
An organopolysiloxane composition of matter curable into elastomeric state, comprising (1) a curable organopolysiloxane base which is an organopolysiloxane polymer and a crosslinking agent therefor, and (2) a catalytically effective amount of the product of reaction between (a) a diorganotin bischelate of the formula: ##STR7## in which: the symbols R 1 and R 2 , which may be identical or different, are each an optionally substituted, monovalent C 1 -C 18 hydrocarbon radical; the symbols R 3 and R 5 , which may be identical or different, are each one of the radicals R 1 or R 2 , a hydrogen atom, C 1 -C 5 alkoxy radical or an Si(R 1 ) 3 silyl radical; and the symbol R 4 is a hydrogen atom, or an optionally halogenated 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 -C 12 cyclic hydrocarbon radical, or an optionally substituted such cyclic radical bearing at least one chloro, nitro and/or cyano substituent, with (b) an organic acid of the formula: XH (2) in which X is a radical of the formula R 6 COO wherein R 6 has the same definition as R 1 , in a molar ratio (1)/(2) ranging from 0.01 to 100 said product of reaction being a monochelate of pentacoordinated tin of valency IV.
Claim 2
Dependent Claim
236 words
An organopolysiloxane composition of matter curable into elastomeric state, comprising (1) a curable organopolysiloxane base which is an organopolysiloxane polymer and a crosslinking agent therefor, and (2) a catalytically effective amount of the product of reaction between (a) a diorganotin bischelate of the formula: ##STR7## in which: the symbols R 1 and R 2 , which may be identical or different, are each an optionally substituted, monovalent C 1 -C 18 hydrocarbon radical; the symbols R 3 and R 5 , which may be identical or different, are each one of the radicals R 1 or R 2 , a hydrogen atom, C 1 -C 5 alkoxy radical or an Si(R 1 ) 3 silyl radical; and the symbol R 4 is a hydrogen atom, or an optionally halogenated 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 -C 12 cyclic hydrocarbon radical, or an optionally substituted such cyclic radical bearing at least one chloro, nitro and/or cyano substituent, with (b) an organic acid of the formula: XH (2) in which X is a radical of the formula R 6 COO wherein R 6 has the same definition as R 1 , in a molar ratio (1)/(2) ranging from 0.01 to 100 said product of reaction being a monochelate of pentacoordinated tin of valency IV.
Claim 3
Dependent Claim
15 words
The organopolysiloxane as defined by claim 1, said molar ratio ranging from 0.5 to 3.
Claim 4
Dependent Claim
124 words
The organopolysiloxane composition as defined by claim 1 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 mPa.s at 25° C. 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 ( 4) 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, alkoxy, alkoxyalkyleneoxy, enoxy or acyloxy, and a is 0 or 1.
Claim 6
Dependent Claim
12 words
The organopolysiloxane composition as defined by claim 1, formulated in single-component form.
Claim 7
Dependent Claim
12 words
The organopolysiloxane composition as defined by claim 1, formulated in two-component form.
References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 1993-05-28 | 1993-11-27 | 1994-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-28 | 1997-11-27 | 1998-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-28 | 2001-11-27 | 2002-05-29 | $7700.00 | Window Closed / Lapsed |