US4234702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicone rubber compositions
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1979-03-21
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Granted: 1980-11-18
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Expires: 1999-03-21
Abstract
Abstract What is disclosed is a method of compatibilizing natural or synthetic organic rubber with silicone rubber in order to enhance the properties of the final rubber product. The method consists of compounding silicone rubber with natural and/or synthetic organic rubber in the presence of an additional organopolysiloxane having long chain carbon substituents attached to the silicon atoms.
Inventors
- 👤 Akito Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:16
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/08; C08L25/10; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K5/00; C08K5/04; C08K5/09; C08K5/14; C08L101/00; C08L21/00; C08L23/00; C08L23/02; C08L23/16; C08L33/00; C08L51/00; C08L51/08; C08L51/085; C08L83/00; C08L83/04; C08L9/00; C08L9/02; C08L9/06; C08G; C08G77/00; C08G77/04; C08G77/20; C08G77/22; C08G77/24; C08G77/70; C08L2205/00; C08L2205/03; C08L2312/00; C08L91/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
30 words
A composition of matter consisting essentially of (a) 5-95 parts by weight of an unvulcanized rubber selected from the group consisting of (i) natural rubber and (ii) synthetic organic rubber;
Claim 2
Dependent Claim
30 words
A composition of matter consisting essentially of (a) 5-95 parts by weight of an unvulcanized rubber selected from the group consisting of (i) natural rubber and (ii) synthetic organic rubber;
Claim 3
Dependent Claim
170 words
(b) 5-95 parts by weight of an unvulcanized organopolysiloxane rubber wherein the silicon atoms in the organopolysiloxane rubber are attached to monovalent hydrocarbon radicals or substituted monovalent hydrocarbon radicals selected from a group consisting of methyl, vinyl, phenyl and 3,3,3-trifluoropropyl radicals and wherein at least 50 mol percent of all the hydrocarbon radicals are methyl; (c) 1-30 parts by weight based on 100 parts by weight of components (a) and (b) of an organopolysiloxane having the average unit formula ##EQU4## wherein R is a substituted or unsubstituted monovalent hydrocarbon radical selected from the group consisting of methyl, ethyl, vinyl, phenyl, naphthyl, β-phenylethyl, 2-phenylpropyl, 3-chloropropyl and 3,3,3-trifluoropropyl radicals and R' is a substituted or unsubstituted aliphatic monovalent hydrocarbon radical of 4 to 20 carbon atoms, a has a value of 1 to 2.5 and b has a value of 0.01 to 1.2 and a+b has a value of 1.9 to 3; (d) 0.1-15 parts by weight based on 100 parts by weight of components (a) and (b) of an organic peroxide.
Claim 4
Dependent Claim
170 words
(b) 5-95 parts by weight of an unvulcanized organopolysiloxane rubber wherein the silicon atoms in the organopolysiloxane rubber are attached to monovalent hydrocarbon radicals or substituted monovalent hydrocarbon radicals selected from a group consisting of methyl, vinyl, phenyl and 3,3,3-trifluoropropyl radicals and wherein at least 50 mol percent of all the hydrocarbon radicals are methyl; (c) 1-30 parts by weight based on 100 parts by weight of components (a) and (b) of an organopolysiloxane having the average unit formula ##EQU4## wherein R is a substituted or unsubstituted monovalent hydrocarbon radical selected from the group consisting of methyl, ethyl, vinyl, phenyl, naphthyl, β-phenylethyl, 2-phenylpropyl, 3-chloropropyl and 3,3,3-trifluoropropyl radicals and R' is a substituted or unsubstituted aliphatic monovalent hydrocarbon radical of 4 to 20 carbon atoms, a has a value of 1 to 2.5 and b has a value of 0.01 to 1.2 and a+b has a value of 1.9 to 3; (d) 0.1-15 parts by weight based on 100 parts by weight of components (a) and (b) of an organic peroxide.
Claim 5
Dependent Claim
24 words
A composition as claimed in claim 1 wherein component (a) is selected from a group consisting of acrylic rubber, ethylene/propylene terpolymer and styrene-butadiene copolymer.
Claim 6
Dependent Claim
28 words
A composition as claimed in claim 1 wherein component (c) is selected from a group of organopolysiloxanes wherein R' is independently selected from n-hexyl, phenylpropyl, n-octyl and dodecyl.
Claim 7
Dependent Claim
14 words
A composition as claimed in claim 1 whenever it has been vulcanized by heating.
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) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |