US4870115A
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Foamable silicone rubber composition
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1989-03-14
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Granted: 1989-09-26
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Expires: 2009-03-14
Abstract
Abstract A foamable silicone rubber composition, comprising: (A) a polyorganosilphenylenesiloxane copolymer represented by Formula (I): <IMAGE> +TR <IMAGE> wherein R1 and R2 are each a particular monohydrocarbon group, and a and h are each an integer of 1 or more and have the relation of 1>/=a/b>/=0.05 and a+b>/=100, (B) an organosilicon compound containing a particular organosiloxy unit having a hydroxyl group, (C) a polyorganohydrogenosiloxane having at least two particular units having an Si-H bond, and (D) a platinum family metal catalyst. This composition can provide a foam with good mechanical strength.
Inventors
- 👤 Kunio Itoh
- 👤 Mitsuo Umemura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:29
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; C08L; C08L83/00; C08L83/14; C08J2383/00; C08J2383/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
215 words
A foamable silicone rubber composition, comprising: (A) a polyorganosilphenylenesiloxane copolymer represented by Formula (I): ##STR24## wherein R 1 's may be the same or different and each represent a substituted or unsubstituted monovalent hydrocarbon group; R 2 's may be the same or different and each represent a methyl group, a phenyl group, or a vinyl group; and a and b are each an integer of 1 or more, provided that they are in the relationship of 1≧a/b≧0.05 and a+b≧100, (B) from 2 to 20 parts by weight of an organosilicon compound containing in its molecule at least one unit in member of a unit represented by Formula (II): ##EQU2## wherein R 3 independently represents a substituted or unsubstituted monovalent hydrocarbon group, c is an integer of 0 to 2, and d is an integer of 1 to 4, provided that c+d makes an integer of 1 to 4, (c) a polyorganohydrogenosiloxane having in its molecule at least two units in number of a unit represented by Formula (III): ##EQU3## wherein R 4 independently represents a substituted or unsubstituted monovalent hydrocarbon, e is an integer of 0 to 2, and f is an integer of 1 to 3, provided that e+f makes an integer of 1 to 3, and (D) a platinum family metal catalyst.
Claim 2
Dependent Claim
215 words
A foamable silicone rubber composition, comprising: (A) a polyorganosilphenylenesiloxane copolymer represented by Formula (I): ##STR24## wherein R 1 's may be the same or different and each represent a substituted or unsubstituted monovalent hydrocarbon group; R 2 's may be the same or different and each represent a methyl group, a phenyl group, or a vinyl group; and a and b are each an integer of 1 or more, provided that they are in the relationship of 1≧a/b≧0.05 and a+b≧100, (B) from 2 to 20 parts by weight of an organosilicon compound containing in its molecule at least one unit in member of a unit represented by Formula (II): ##EQU2## wherein R 3 independently represents a substituted or unsubstituted monovalent hydrocarbon group, c is an integer of 0 to 2, and d is an integer of 1 to 4, provided that c+d makes an integer of 1 to 4, (c) a polyorganohydrogenosiloxane having in its molecule at least two units in number of a unit represented by Formula (III): ##EQU3## wherein R 4 independently represents a substituted or unsubstituted monovalent hydrocarbon, e is an integer of 0 to 2, and f is an integer of 1 to 3, provided that e+f makes an integer of 1 to 3, and (D) a platinum family metal catalyst.
Claim 3
Dependent Claim
25 words
The composition of claim 1, wherein R 1 's in Formula (I) are methyl groups, and R 2 's are methyl groups or vinyl groups.
Claim 4
Dependent Claim
24 words
The composition of claim 1, wherein a and b in Formula (I) are integers such that they satisfy the relations of 0.5≧a/b≧0.2 and 20,000≧a+b≧200.
Claim 5
Dependent Claim
27 words
The composition of claim 1, wherein the component (A) is at least one selected from the group consisting of the compounds represented by the following formulas: ##STR25##
Claim 6
Dependent Claim
30 words
The composition of claim 1, wherein the component (B) is an organosilicon compound having in its molecule at least three units in number of the unit represented by Formula (II).
Claim 7
Dependent Claim
20 words
The composition of claim 1, wherein R 3 in Formula (II) is independently a methyl group or a phenyl group.
Claim 8
Dependent Claim
25 words
The composition of claim 1, wherein c in Formula (II) is integer of 1 or 2, and d is an integer of 1 to 3.
Claim 9
Dependent Claim
80 words
The composition of claim 1, wherein the component (B) is at least one selected from the group consisting of the compounds represented by the following formulas: ##STR26## a copolymer resin comprised of a [(CH 3 ) 3 SiO 1/2 ] unit and a [SiO 2 ] unit, and a copolymer resin having the unit composition of [(CH 2 ═CH)(CH 3 ) 2 SiO 1/2 ] 0 .05 [(CH 3 ) 3 SiO 1/2 ] 0 .95.[SiO 2 ] 1 .
Claim 10
Dependent Claim
26 words
The composition of claim 1, wherein the component (C) is a polyorganohydrogenosiloxane containing at least three units in number of the unit represented by Formula (III).
Claim 11
Dependent Claim
20 words
The composition of claim 1, wherein R 4 in Formula (III) is independently a methyl group or a phenyl group.
Claim 12
Dependent Claim
15 words
The composition of claim 1, wherein f in Formula (III) is an integer of 1.
Claim 13
Dependent Claim
40 words
The composition of claim 1, wherein the component (C) has in its molecule at least three Si--H bonds, and hydrogen atoms comprise not less than 30% of all the side groups bonded to silicon atoms of the main molecular chain.
Claim 14
Dependent Claim
42 words
The composition of claim 1, wherein the component (C) is at least one selected from the group consisting of the compounds represented by the following formulas: ##STR27## in the above formulas, p, q, r, s and t are each a positive integer.
Claim 15
Dependent Claim
64 words
The composition of claim 1, comprising 100 parts by weight of the component (A), and the component (C) in such an amount that the Si--H bonds in the component (C) may be contained in an amount of from 1 to 30 mols per mol of the total amount of the vinyl groups in the component (A) and the hydroxyl groups in the component (B).
Claim 16
Dependent Claim
75 words
The composition of claim 1, comprising 100 parts by weight of the component (A), from 5 to 10 parts by weight of the component (B), and the component (C) in such an amount that the Si--H bonds in the component (C) may be contained in an amount of from 5 to 20 mols per mol of the total amount of the vinyl groups in the component (A) and the hydroxyl groups in the component (B).
Claim 17
Dependent Claim
32 words
The composition of claim 1, wherein the component (D) is contained in an amount of from 0.1 to 300 ppm based on the total amount of the components (A), (B) and (C).
Claim 18
Dependent Claim
32 words
The composition of claim 1, wherein the component (D) is contained in an amount of from 5 to 100 ppm based on the total amount of the components (A), (B) and (C).
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) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |