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US5519096A
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Compounds for solvent resistant silicone gels
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1994-06-30
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Granted: 1996-05-21
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Expires: 2014-06-30
Abstract
Abstract A composition for a solvent resistant silicone gel which comprises (A) 100 weight parts of branched organopolysiloxane having vinyl groups which contains: -(CF3-CH2-CH2)(CH3)SiO units 70.0-98.5 mol % -RSiO1.5 units 0.5-10.0 mol %, and -(CH2=CH)(CH3)2SiO0.5 units 1.0-10.0 mol %, - where R is a group selected from a 3,3,3-trifluoropropyl group, a phenyl group, a methyl group and a vinyl group, (B) 0.1 to 30 weight parts of organohydrogen polysiloxane having at least one hydrogen atom bound to a silicon atom within the molecule, and (C) an addition reaction catalyst. The composition can form a cured silicone gel product which possesses a superior solvent resistance towards, for example, gasoline, while maintaining flexibility at low temperature.
Inventors
- 👤 Hiroyasu Hara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:12
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/22; C08G77/24; C08L; C08L83/00; C08L83/04; C08L83/08
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
97 words
A composition for a solvent resistant silicone gel which comprises: (A) 100 parts by weight of a branched organopolysiloxane having vinyl groups which comprises: ______________________________________
(CF.sub.3 --CH.sub.2 --CH.sub.2)(CH.sub.3)SiO units
70.0-98.5 mol %
RSiO.sub.1.5 units 0.5-10.0 mol %, and
(CH.sub.2 ═CH)(CH.sub.3).sub.2 SiO.sub.0.5 units
1.0-10.0 mol %,
______________________________________ wherein R is a group selected from a 3,3,3-trifluoropropyl group, a phenyl group, a methyl group and a vinyl group, (B) 0.1 to 30 parts by weight of an organohydrogen polysiloxane having at least one hydrogen atom bound to a silicon atom within the molecule, and (C) an addition reaction catalyst.
Claim 2
Dependent Claim
97 words
A composition for a solvent resistant silicone gel which comprises: (A) 100 parts by weight of a branched organopolysiloxane having vinyl groups which comprises: ______________________________________
(CF.sub.3 --CH.sub.2 --CH.sub.2)(CH.sub.3)SiO units
70.0-98.5 mol %
RSiO.sub.1.5 units 0.5-10.0 mol %, and
(CH.sub.2 ═CH)(CH.sub.3).sub.2 SiO.sub.0.5 units
1.0-10.0 mol %,
______________________________________ wherein R is a group selected from a 3,3,3-trifluoropropyl group, a phenyl group, a methyl group and a vinyl group, (B) 0.1 to 30 parts by weight of an organohydrogen polysiloxane having at least one hydrogen atom bound to a silicon atom within the molecule, and (C) an addition reaction catalyst.
Claim 3
Dependent Claim
26 words
The composition of claim 1, wherein the branched organopolysiloxane (A) further comprises 10 mol % or less of (CH 3 ) 3 SiO 0 .5 units.
Claim 4
Dependent Claim
21 words
The composition of claim 1, wherein the branched organopolysiloxane (A) contains 2.0 to 5.0 mol % of RSiO 1 .5 units.
Claim 5
Dependent Claim
19 words
The composition of claim 1, wherein the branched organopolysiloxane (A) contains 0.5 to 8.0 mol % of vinyl groups.
Claim 6
Dependent Claim
22 words
The composition of claim 1, wherein the branched organopolysiloxane (A) has a viscosity at 25° C. of from 50 to 100,000 cP.
Claim 7
Dependent Claim
44 words
The composition of claim 1, wherein the organohydrogen polysiloxane (B) is present in an amount sufficient to provide 0.3 to 2.0 moles of hydrogen atoms bound to silicon atoms per 1.0 mole of vinyl groups bound to silicon atoms in the branched organopolysiloxane (A).
Claim 8
Dependent Claim
13 words
The composition of claim 1, wherein the organohydrogen polysiloxane (B) contains fluorine atoms.
Claim 9
Dependent Claim
21 words
The composition of claim 1, wherein the organohydrogen polysiloxane (B) has a viscosity at 25° C. of 10 to 10,000 cP.
Claim 10
Dependent Claim
18 words
The composition of claim 1, wherein the addition reaction catalyst is a platinum or platinum group metal catalyst.
Claim 11
Dependent Claim
56 words
The composition of claim 1, wherein the branched organopolysiloxane containing vinyl groups, (A), is prepared by ring-opening polymerizing, in the presence of an alkali or acid equilibration catalyst, raw materials selected from cyclic trimers of methyl-3,3,3-trifluoro-propylsiloxane, vinyl group-containing organodisiloxanes and cohydrolyzed products of silanes having RSiO 1 .5 units obtained by cohydrolyzing organotrichlorosilanes with other chlorosilanes.
Claim 12
Dependent Claim
52 words
A composition for the solvent resistant silicone gel described in claim 1, wherein said component (A) is derived from a ring-opening polymerization product which was prepared by the ring-opening polymerization of cyclic trimers of methyl-3,3,3-trifluoropropyl siloxane in the presence of a penta-coordinated silicon catalyst at a temperature of at most 50° C.
Claim 13
Dependent Claim
80 words
A composition of claim 10, wherein the penta-coordinated silicon catalyst is of the following formula ##STR5## wherein M + is either BzMe 3 N + , Bu 4 N + , Me 4 N + , Li + , Na + or K + , wherein Me, Bu and Bz are a methyl group, a butyl group, and a benzyl group, respectively, and R is selected from a 3,3,3-trifluoropropyl group, a phenyl group, a methyl group and a vinyl group.
Claim 14
Dependent Claim
13 words
A silicone gel obtained by heat curing of a composition of claim 1.
Claim 15
Dependent Claim
29 words
A silicone gel of claim 13 having a penetration, measured by using the 1/4 inch scale cone as defined by ASTM D1403 of 0 to 200 at 25° C.
Claim 16
Dependent Claim
26 words
The composition of claim 1, wherein the branched organopolysiloxane contains 75 to 95 mol % of (CF 3 --CH 2 --CH 2 )(CH 3 )SiO units.
Claim 17
Dependent Claim
26 words
The composition of claim 1, wherein the branched organopolysiloxane contains 3.0 to 7.0 mol % of (CH 2 ═CH)(CH 3 ) 2 SiO 0 .5 units.
Claim 18
Dependent Claim
12 words
The composition of claim 1, wherein the organohydrogen polysiloxane contains 3,3,3-trifluoropropyl groups.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-05-21 | 1999-11-20 | 2000-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-05-21 | 2003-11-20 | 2004-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-05-21 | 2007-11-20 | 2008-05-21 | $7700.00 | Window Closed / Lapsed |