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US3941741A
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Self-bonding, heat-curable silicone rubber
Assignee: General Electric Co
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Filing: 1972-11-17
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Granted: 1976-03-02
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Expires: 1992-11-17
Abstract
Abstract Self-bonding, heat-curable silicone rubber composition comprising (a) a diorganopolysiloxane polymer (b) a curing catalyst and (c) a compound of the formula, ##EQU1## where R 6 is selected from alkyl radicals and hydrogen, Z is seleccted from COO, phenylene, CO, CONH and CON-R 2 , R 2 is selected from monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals, R 5 is selected from unsaturated monovalent hydrocarbon radicals and unsaturated halogenated monovalent hydrocarbon radicals, G 1 is selected from hydrogen, R 2 radicals and R 5 radicals. There may also be used in the above composition a process aid, a filler, and other ingredients commonly used in heat-curable silicone rubber compositions. In place of the maleate set forth above, and/or in addition to the maleate set forth above, there may be used a silylmaleate.
Inventors
- 👤 George P. De Zuba
- 👤 Abe Berger
- 👤 Terry G. Selin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:40
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0008; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/22; C08G77/24
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
166 words
A process for forming a self-bonding, heat-curable silicone rubber with superior adhesion to substrates comprising mixing from 82 to 99.65% by weight of an organopolysiloxane polymer having a viscosity of at least 100,000 centipoise at 25°C of the formula, (R).sub.a SiO.sub.(4.sub.-a)/2 , with from 0.1 to 8% by weight of a curing catalyst and from 0.25 to 10% by weight of a self-bonding additive selected from the group consisting of the formula, ##EQU16## and of the formula, ##EQU17## where R is selected from monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals, R 6 is selected from alkyl radicals and hydrogen, Z is selected from COO, phenylene, CO, ##EQU18## R 2 is selected from the same radicals as R, R 5 is selected from unsaturated monovalent hydrocarbon radicals and unsaturated halogenated monovalent hydrocarbon radicals, G' is selected from hydrogen, R radicals and R 5 radicals, a varies from 1.95 to 2.01, inclusive, and heating the resulting mixture to a temperature in the range of 80°C to 650°C.
Claim 2
Dependent Claim
166 words
A process for forming a self-bonding, heat-curable silicone rubber with superior adhesion to substrates comprising mixing from 82 to 99.65% by weight of an organopolysiloxane polymer having a viscosity of at least 100,000 centipoise at 25°C of the formula, (R).sub.a SiO.sub.(4.sub.-a)/2 , with from 0.1 to 8% by weight of a curing catalyst and from 0.25 to 10% by weight of a self-bonding additive selected from the group consisting of the formula, ##EQU16## and of the formula, ##EQU17## where R is selected from monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals, R 6 is selected from alkyl radicals and hydrogen, Z is selected from COO, phenylene, CO, ##EQU18## R 2 is selected from the same radicals as R, R 5 is selected from unsaturated monovalent hydrocarbon radicals and unsaturated halogenated monovalent hydrocarbon radicals, G' is selected from hydrogen, R radicals and R 5 radicals, a varies from 1.95 to 2.01, inclusive, and heating the resulting mixture to a temperature in the range of 80°C to 650°C.
Claim 3
Dependent Claim
20 words
The process of claim 1 further including a silica filler which comprises 20 to 60% by weight of the organopolysiloxane.
Claim 4
Dependent Claim
38 words
The process of claim 1 wherein there is added to said organopolysiloxane a process aid selected from the class consisting of a dihydrocarbon-substituted oil and a hydroxylated organosiloxane which comprises 1 to 25% by weight of said organopolysiloxane.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the curing catalyst is t-butyl perbenzoate.
Claim 6
Dependent Claim
29 words
The process of claim 1 wherein at least 50% of the R radicals are methyl, R 6 is hydrogen, and G' is the same as the R 5 radicals.
Claim 7
Dependent Claim
11 words
The process of claim 1 wherein the self-bonding additive is diallylmaleate.
Claim 8
Dependent Claim
211 words
A process for forming a self-bonding, heat-curable silicone rubber with superior adhesion to substrates comprising mixing from 82 to 99.65% by weight of an organopolysiloxane polymer having a viscosity of at least 100,000 centipoise at 25°C of the formula, (R).sub.a SiO.sub.(4.sub.-a)/2 , with from 0.1 to 8% by weight of a curing catalyst and from 0.25 to 10% by weight of a self-bonding additive selected from the group consisting of the formula, ##EQU19## and of the formula, ##EQU20## where Z is selected from the group consisting of COO, phenylene, CO, ##EQU21## G is selected from hydrogen, R' and R 4 SiR 2 n (M) 3 -n , M is selected from R 3 O and R 3 OOO, where R, R 2 and R 3 are selected from the group consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals, R 6 is selected from alkyl radicals and hydrogen, R 4 is selected from divalent hydrocarbon radicals and halogenated divalent hydrocarbon radicals, R' is selected from the group consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals, a varies from 1.95 to 2.01, inclusive, n is a whole number that varies from 1 to 3, and heating the resulting mixture to a temperature in the range of 80°C to 650°C.
Claim 9
Dependent Claim
211 words
A process for forming a self-bonding, heat-curable silicone rubber with superior adhesion to substrates comprising mixing from 82 to 99.65% by weight of an organopolysiloxane polymer having a viscosity of at least 100,000 centipoise at 25°C of the formula, (R).sub.a SiO.sub.(4.sub.-a)/2 , with from 0.1 to 8% by weight of a curing catalyst and from 0.25 to 10% by weight of a self-bonding additive selected from the group consisting of the formula, ##EQU19## and of the formula, ##EQU20## where Z is selected from the group consisting of COO, phenylene, CO, ##EQU21## G is selected from hydrogen, R' and R 4 SiR 2 n (M) 3 -n , M is selected from R 3 O and R 3 OOO, where R, R 2 and R 3 are selected from the group consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals, R 6 is selected from alkyl radicals and hydrogen, R 4 is selected from divalent hydrocarbon radicals and halogenated divalent hydrocarbon radicals, R' is selected from the group consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals, a varies from 1.95 to 2.01, inclusive, n is a whole number that varies from 1 to 3, and heating the resulting mixture to a temperature in the range of 80°C to 650°C.
Claim 10
Dependent Claim
20 words
The process of claim 7 further including a silica filler which comprises 20 to 60% by weight of the organopolysiloxane.
Claim 11
Dependent Claim
38 words
The process of claim 8 wherein there is added to said organopolysiloxane a process aid selected from the class consisting of a dihydrocarbon-substituted oil and a hydroxylated organosiloxane which comprises 1 to 25% by weight of said organopolysiloxane.
Claim 12
Dependent Claim
12 words
The process of claim 7 wherein the curing catalyst is t-butyl perbenzoate.
Claim 13
Dependent Claim
21 words
The process of claim 7 wherein Z is COO and G is R 4 SiR 2 n (M) 3 -n .
Claim 14
Dependent Claim
23 words
The process of claim 11 where R 4 is propylene, M is R 3 O and R 2 and R 3 are methyl.
Claim 15
Dependent Claim
11 words
The process of claim 7 wherein the self-bonding additive is trimethoxysilylpropylallylmaleate.
References Cited (Backward Citations)
US3070567A
Cited
US3231542A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |