US4849491A
Expired / Lapsed
US
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Curable organopolysiloxane composition
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1988-03-07
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Granted: 1989-07-18
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Expires: 2008-03-07
Abstract
Abstract A curable organopolysiloxane composition comprising: (A) an organopolysiloxane having at least two aliphatic unsaturated hydrocarbon groups, (B) a particular organohydrogenpolysiloxane having a group represented by the formula: <IMAGE> wherein R3 is a substituted or unsubstituted monovalent hydrocarbon group and a is an integer of 2 or 3, and (C) a platinum catalyst. This composition has good curing properties, and the silicone film obtained by curing has good release properties which is stable for a long period of time.
Inventors
- 👤 Masahiko Ogawa
- 👤 Meguru Kashida
- 👤 Kenichi Isobe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:15
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/48; C08G77/50; C08K; C08K5/00; C08K5/54; C08L; C08L83/00; C08L83/04; C08L83/14; C08G77/04; C08G77/12; C08G77/20
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
170 words
A curable organopolysiloxane composition comprising: (A) 100 parts by weight of an organopolysiloxane having at least two silicon-bonded aliphatic unsaturated hydrocarbon groups in its molecule, (B) an organohydrogenpolysiloxane represented by the general formula (I): ##STR20## wherein R 1 and R 2 are each a substituted or unsabstituted monovalent hydrocarbon group containing no aliphatic unsaturated hydrocarbon groups, T is a group represented by the general formula (II): ##STR21## where R 3 has the same meaning as R 1 and a is an integer of 2 or 3, R T represents R 1 or T, m and n are each an integer of 0 to 2,000 and satisfy 2 ≦m+n ≦2,000, provided that n is not 0 when R T is R 1 , in an amount such that the molar ratio of the silicon-bonded hydrogen atoms in said Component (B) to the silicon-bonded aliphatic unsaturated hydrocarbon groups in said Component (A) is 0.5 to 4.0, and (C) at least 0.0001 part by weight of a platinum catalyst in terms of platinum.
Claim 2
Dependent Claim
170 words
A curable organopolysiloxane composition comprising: (A) 100 parts by weight of an organopolysiloxane having at least two silicon-bonded aliphatic unsaturated hydrocarbon groups in its molecule, (B) an organohydrogenpolysiloxane represented by the general formula (I): ##STR20## wherein R 1 and R 2 are each a substituted or unsabstituted monovalent hydrocarbon group containing no aliphatic unsaturated hydrocarbon groups, T is a group represented by the general formula (II): ##STR21## where R 3 has the same meaning as R 1 and a is an integer of 2 or 3, R T represents R 1 or T, m and n are each an integer of 0 to 2,000 and satisfy 2 ≦m+n ≦2,000, provided that n is not 0 when R T is R 1 , in an amount such that the molar ratio of the silicon-bonded hydrogen atoms in said Component (B) to the silicon-bonded aliphatic unsaturated hydrocarbon groups in said Component (A) is 0.5 to 4.0, and (C) at least 0.0001 part by weight of a platinum catalyst in terms of platinum.
Claim 3
Dependent Claim
29 words
The composition according to claim 1, wherein the amount of the aliphatic unsaturated hydrocarbon groups in all the organic groups in Component (A) is 0.2 to 5.0 mole %.
Claim 4
Dependent Claim
41 words
The composition according to claim 1, wherein the organopolysiloxane of Component (A) is a linear dimethylpolysiloxane terminated with dimethylvinylsilyl group, methylvinylsilyl group or trivinylsilyl group at both ends and having a viscosity of 100 to 10,000,000 cP at 25 ° C.
Claim 5
Dependent Claim
26 words
The composition according to claim 1, wherein R 1 , R 2 and R 3 in said general formula (I) representing Component (B) are methyl groups.
Claim 6
Dependent Claim
31 words
The composition according to claim 1, wherein T in said general formula (I) representing component (B) is the group of the formula (II) ##STR22## wherein R 3 is as defined above.
Claim 7
Dependent Claim
24 words
The composition according to claim 1, wherein R T in the general formula (I) representing Component (B) is T represented by said formula (II).
Claim 8
Dependent Claim
31 words
The composition according to claim 1, wherein the organohydrogenpolysiloxane of component (B) contains at least 20% of silicon atoms having Si-T bond based on all the silicon atoms in its molecule.
Claim 9
Dependent Claim
31 words
The composition according to claim 7, wherein the organohydrogenpolysiloxane of Component (B) contains 20 to 80% of silicon atoms having Si-T bond based on all the silicon atoms in its molecule.
Claim 10
Dependent Claim
33 words
The composition according to claim 1, wherein m and n in said general formula (I) representing Component (B) are each an integer of 5 to 100, provided that m+n is 10 to 200.
Claim 11
Dependent Claim
71 words
The composition according to claim 1, wherein the organohydrogenpolysiloxane of Component (B) is represented by the formula (III): ##STR23## wherein T 1 is the group of the formula: ##STR24## and m' and n' are each an integer of 5 to 100 provided that m+n is 10 to 200, and the amount of silicon atoms having Si-T l bond based on all the silicon atoms in the molecule is 20 to 80%.
Claim 12
Dependent Claim
42 words
The composition according to claim 1, wherein the amount of Component (B) is such that the molar ratio of the silicon-bonded hydrogen atoms in this Component (B) to the silicon-bonded aliphatic unsaturated hydrocarbon groups in said Component (A) is 1.0 to 3.0.
Claim 13
Dependent Claim
27 words
The composition according to claim 1, wherein the amount of the platinum catalyst of Component (C) is 0.001 to 0.1 part by weight in terms of platinum.
References Cited (Backward Citations)
US3933882A
Cited
US3983298A
Cited
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