US5032626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat curable silicone compositions
Assignee: General Electric Co
•
Filing: 1989-06-01
•
Granted: 1991-07-16
•
Expires: 2009-06-01
Abstract
Abstract In a heat curable silicone rubber composition comprising a polydiorganosiloxane base polymer and a curing catalyst, the improvement comprising an effective amount of co-curing agent. Preferably, the co-curing agent has the general formula ##STR1## where R is H or a C 1-5 alkyl radical, R 1 is a C 1-5 alkylene radical, each R 2 is independently selected from H and CH 3 , R 3 is H or CH 3 , n equals 0 or 1, and m is an integer from 3 to 6, inclusive.
Inventors
- 👤 Edwin R. Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:51
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/12; C08K5/11; C08K5/14
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
122 words
A heat curable silicone rubber composition, comprising: (a) a polydiorganosiloxane base polymer having the general formula: ##STR6## wherein R is selected from monovalent substituted or unsubstituted organic radicals, a varies from about 1.95 to about 2.02, inclusive, and the viscosity is at least about 100,000 centipoise at 25° C; (b) an effective amount of catalyst to promote curing; (c) from 0.2 to 0.4 parts by weight of co-curing agent per 100 parts by weight polydiorganosiloxane (a), said co-curing agent comprising a silicone soluble monomer having at least three olefinic functional groups to improve tear strength and lower compression set; and (d) reinforcing filler in an amount from 5 to 40 parts by weight silica per 100 parts by weight said polydiorganosiloxane (a).
Claim 2
Dependent Claim
122 words
A heat curable silicone rubber composition, comprising: (a) a polydiorganosiloxane base polymer having the general formula: ##STR6## wherein R is selected from monovalent substituted or unsubstituted organic radicals, a varies from about 1.95 to about 2.02, inclusive, and the viscosity is at least about 100,000 centipoise at 25° C; (b) an effective amount of catalyst to promote curing; (c) from 0.2 to 0.4 parts by weight of co-curing agent per 100 parts by weight polydiorganosiloxane (a), said co-curing agent comprising a silicone soluble monomer having at least three olefinic functional groups to improve tear strength and lower compression set; and (d) reinforcing filler in an amount from 5 to 40 parts by weight silica per 100 parts by weight said polydiorganosiloxane (a).
Claim 3
Dependent Claim
67 words
A composition as in claim 1, wherein the co-curing agent has the general formula ##STR7## where R is hydrogen or a lower alkyl radical having from 1 to 5 carbon atoms, R 1 is a lower alkylene radical having from 1 to 5 carbon atoms, R 2 is hydrogen or a methyl radical, R 3 is hydrogen or a methyl radical, and n equals 0 or 1.
Claim 4
Dependent Claim
14 words
A composition as in claim 2, wherein the co-curing agent is trimethylol propane trimethacrylate.
Claim 5
Dependent Claim
49 words
A composition as in claim 1, wherein the co-curing agent has the general formula ##STR8## where R 1 is a lower alkylene radical having from 1 to 5 carbon atoms, each R 2 is independently selected from hydrogen and methyl, and m is an integer from 3 6, inclusive.
Claim 6
Dependent Claim
13 words
A composition as in claim 4, wherein the co-curing agent is triallyl trimellitate.
Claim 7
Dependent Claim
176 words
A heat curable silicone rubber composition, comprising: (a) 100 parts by weight of polydiorganosiloxane base polymer having the general formula: ##STR9## where R is selected from monovalent substituted or unsubstituted organic radicals, a varies from about 1.95 to about 2.02, inclusive, and the viscosity is at least about 100,000 centipoise at 25° C.; (b) from 0.1 to 5 parts by weight of organic peroxide catalyst, (c) from 5 to 40 parts by weight of reinforcing filler, and (d) from 0.2 to 0.4 parts by weight of co-curing agent per 100 parts by weight of polydiorganosiloxane (a) to improve tear strength and lower compression set, said co-curing agent selected from compounds having the general formula: ##STR10## where R is hydrogen or a lower alkyl radical having from 1 to 5 carbon atoms, R 1 is a lower alkylene radical having from 1 to 5 carbon atoms, each R 2 is independently selected from hydrogen or methyl, R 3 is hydrogen or methyl, n equals 0 or 1, and m is an integer from 3 to 6, inclusive.
Claim 8
Dependent Claim
176 words
A heat curable silicone rubber composition, comprising: (a) 100 parts by weight of polydiorganosiloxane base polymer having the general formula: ##STR9## where R is selected from monovalent substituted or unsubstituted organic radicals, a varies from about 1.95 to about 2.02, inclusive, and the viscosity is at least about 100,000 centipoise at 25° C.; (b) from 0.1 to 5 parts by weight of organic peroxide catalyst, (c) from 5 to 40 parts by weight of reinforcing filler, and (d) from 0.2 to 0.4 parts by weight of co-curing agent per 100 parts by weight of polydiorganosiloxane (a) to improve tear strength and lower compression set, said co-curing agent selected from compounds having the general formula: ##STR10## where R is hydrogen or a lower alkyl radical having from 1 to 5 carbon atoms, R 1 is a lower alkylene radical having from 1 to 5 carbon atoms, each R 2 is independently selected from hydrogen or methyl, R 3 is hydrogen or methyl, n equals 0 or 1, and m is an integer from 3 to 6, inclusive.
Claim 9
Dependent Claim
42 words
A composition as in claim 6, wherein polydiorganosiloxane (a) is a fluorosilicone polymer and reinforcing filler (d) is fluorosilicone treated fumed silica present in an amount ranging from 30 to 50 parts by weight per 100 parts by weight of polydiorganosiloxane (a).
Claim 10
Dependent Claim
6 words
The cured composition of claim 1.
Claim 11
Independent Claim
127 words
A method for making a heat curable silicone rubber composition, comprising mixing: (a) a polydiorganosiloxane base polymer having the general formula: ##STR11## where R is selected from monovalent substituted or unsubstituted organic radicals, a varies from about 1.95 to about 2.02, inclusive, and the viscosity is at least about 100,000 centipoise at 25° C.; (b) an effective amount of catalyst to promote curing; (c) from 0.2 to 0.4 parts by weight of co-curing agent per 100 parts by weight polydiorganosiloxane (a), said co-curing agent comprising a silicone soluble monomer having at least three olefinic functional groups to improve tear strength and lower compression set; and (d) reinforcing filler in an amount from 5 to 40 parts by weight silica per 100 parts by weight said polydiorganosiloxane (a).
Claim 12
Independent Claim
127 words
A method for making a heat curable silicone rubber composition, comprising mixing: (a) a polydiorganosiloxane base polymer having the general formula: ##STR11## where R is selected from monovalent substituted or unsubstituted organic radicals, a varies from about 1.95 to about 2.02, inclusive, and the viscosity is at least about 100,000 centipoise at 25° C.; (b) an effective amount of catalyst to promote curing; (c) from 0.2 to 0.4 parts by weight of co-curing agent per 100 parts by weight polydiorganosiloxane (a), said co-curing agent comprising a silicone soluble monomer having at least three olefinic functional groups to improve tear strength and lower compression set; and (d) reinforcing filler in an amount from 5 to 40 parts by weight silica per 100 parts by weight said polydiorganosiloxane (a).
Claim 13
Dependent Claim
67 words
A method as in claim 9, wherein the co-curing agent has the general formula ##STR12## where R is hydrogen or a lower alkyl radical having from 1 to 5 carbon atoms, R 1 is a lower alkylene radical having from 1 to 5 carbon atoms, R 2 is hydrogen or a methyl radical, R 3 is hydrogen or a methyl radical, and n equals 0 or 1.
Claim 14
Dependent Claim
14 words
A method as in claim 10, wherein the co-curing agent is trimethylol propane trimethacrylate.
Claim 15
Dependent Claim
50 words
A method as in claim 9, wherein the co-curing agent has the general formula ##STR13## where R 1 is a lower alkylene radical having from 1 to 5 carbon atoms, each R 2 is independently selected from hydrogen or methyl, and m is an integer from 3 to 6, inclusive.
Claim 16
Dependent Claim
13 words
A method as in claim 12, wherein the co-curing agent is triallyl trimellitate.
Claim 17
Independent Claim
181 words
A method for making a heat curable silicone rubber composition, comprising mixing: (a) 100 parts by weight of polydiorganosiloxane base polymer having the general formula: ##STR14## where R is selected from monovalent substituted or unsubstituted organic radicals, a varies from about 1.95 to about 2.02, inclusive, and the viscosity is at least about 100,000 centipoise at 25° C.; (b) from 0.1 to 5 parts by weight of organic peroxide catalyst, (c) from 5 to 40 parts by weight of reinforcing filler, and (d) from 0.2 to 0.4 parts by weight of co-curing agent per 100 parts by weight of polydiorganosiloxane (a) to improve tear strength and lower compression set, said co-curing agent selected from compounds having the general formula: ##STR15## where R is hydrogen or a lower alkyl radical having from 1 to 5 carbon atoms, R 1 is a lower alkylene radical having from 1 to 5 carbon atoms, each R 2 is independently selected from hydrogen or methyl, R 3 is hydrogen or methyl, n equals 0 or 1, and m is an integer from 3 to 6, inclusive.
Claim 18
Independent Claim
181 words
A method for making a heat curable silicone rubber composition, comprising mixing: (a) 100 parts by weight of polydiorganosiloxane base polymer having the general formula: ##STR14## where R is selected from monovalent substituted or unsubstituted organic radicals, a varies from about 1.95 to about 2.02, inclusive, and the viscosity is at least about 100,000 centipoise at 25° C.; (b) from 0.1 to 5 parts by weight of organic peroxide catalyst, (c) from 5 to 40 parts by weight of reinforcing filler, and (d) from 0.2 to 0.4 parts by weight of co-curing agent per 100 parts by weight of polydiorganosiloxane (a) to improve tear strength and lower compression set, said co-curing agent selected from compounds having the general formula: ##STR15## where R is hydrogen or a lower alkyl radical having from 1 to 5 carbon atoms, R 1 is a lower alkylene radical having from 1 to 5 carbon atoms, each R 2 is independently selected from hydrogen or methyl, R 3 is hydrogen or methyl, n equals 0 or 1, and m is an integer from 3 to 6, inclusive.
Claim 19
Dependent Claim
43 words
A method as in claim 14, wherein polydiorganosiloxane (a) is a fluorosilicone polymer and reinforcing filler (d) is fluorosilicone treated fumed silica present in an amount ranging from about 30 to 40 parts by weight per 100 parts by weight of polydiorganosiloxane (a).
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) | 1994-07-15 | 1995-01-14 | 1995-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-15 | 1999-01-14 | 1999-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-15 | 2003-01-14 | 2003-07-16 | $7700.00 | Window Closed / Lapsed |