US4341675A
Expired / Lapsed
US
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Rubber compositions containing ethylene-propylene-diene terpolymers or ethylene-propylene copolymers and silicones
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1981-03-30
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Granted: 1982-07-27
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Expires: 2001-03-30
Abstract
Abstract A rubber made from a blend of EPDM or EPR and a polydiorganosiloxane gum has strength, heat resistance, and adhesiveness to room-temperature, moisture-curable silicone rubber. The rubber is made from a blend of EPDM or EPR, polydiorganosiloxane gum, a polyorganosiloxane containing aliphatic hydrocarbon radicals of 4 to 20 carbon atoms, a polyoxyalkylene-organosiloxane copolymer or a poly(hydroxyalkyl)organosiloxane, and an organic peroxide.
Inventors
- 👤 Akito Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:03
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/16; C08K; C08K3/00; C08K3/34; C08K3/36; C08K5/00; C08K5/04; C08K5/09; C08K5/14; C08L51/00; C08L51/08; C08L51/085; C08L83/00; C08L83/04; C08L91/00; C08L2205/00; C08L2205/03; C08L2205/035; C08L2312/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
329 words
A rubber composition comprising (A) 95 to 5 parts by weight of unvulcanized ethylenepropylene-diene terpolymer or ethylene-propylene copolymer, (B) 5 to 95 parts by weight of a polydiorganosiloxane gum in which the organic radicals are selected from methyl, vinyl, phenyl, and 3,3,3-trifluoropropyl, said organic radicals being at least 50 percent methyl based on the total number of organic radicals, a combination of (A) and (B) being 100 parts by weight, (C) 1 to 30 parts by weight of a polyorganosiloxane based on 100 parts by weight of combined (A) and (B), said polyorganosiloxane having an average unit formula ##EQU2## in which R represents a monovalent radical selected from the group consisting of vinyl, alkyl radicals of 1 to 3 carbon atoms, halogenated alkyl radicals of 1 to 3 carbon atoms, aryl radicals, halogenated aryl radicals, and alkyl radicals of 1 to 3 carbon atoms substituted with an aryl radical, R' represents a monovalent radical selected from the group consisting of aliphatic hydrocarbon radicals having from 4 to 20 carbon atoms and their derivatives in which at least one hydrogen atom is substituted with a chlorine atom or a phenyl radical, a has a value of from 1 to 2.5, b has a value of from 0.01 to 1.2, and the sum of a plus b has a value of from 1.8 to 3, (D) 1 to 30 parts by weight based on 100 parts by weight of combined (A) and (B), of a polymer selected from polyoxyalkylene-organosiloxane copolymers or poly(hydroxyalkyl)organosiloxanes, in which the oxyalkylene contains 2 or 3 carbon atoms, the hydroxyalkyl radicals contain 1 to 8 carbon atoms, the organic radicals are monovalent radicals selected from the group consisting of vinyl, phenyl, phenylethyl, 3,3,3-trifluoropropyl, and alkyl radicals containing 1 to 8 carbon atoms, and at least 50 percent of the organic radicals are alkyl radicals, and (E) 0.1 to 15 parts by weight based on 100 parts by weight of combined (A) and (B), of an organic peroxide.
Claim 2
Dependent Claim
329 words
A rubber composition comprising (A) 95 to 5 parts by weight of unvulcanized ethylenepropylene-diene terpolymer or ethylene-propylene copolymer, (B) 5 to 95 parts by weight of a polydiorganosiloxane gum in which the organic radicals are selected from methyl, vinyl, phenyl, and 3,3,3-trifluoropropyl, said organic radicals being at least 50 percent methyl based on the total number of organic radicals, a combination of (A) and (B) being 100 parts by weight, (C) 1 to 30 parts by weight of a polyorganosiloxane based on 100 parts by weight of combined (A) and (B), said polyorganosiloxane having an average unit formula ##EQU2## in which R represents a monovalent radical selected from the group consisting of vinyl, alkyl radicals of 1 to 3 carbon atoms, halogenated alkyl radicals of 1 to 3 carbon atoms, aryl radicals, halogenated aryl radicals, and alkyl radicals of 1 to 3 carbon atoms substituted with an aryl radical, R' represents a monovalent radical selected from the group consisting of aliphatic hydrocarbon radicals having from 4 to 20 carbon atoms and their derivatives in which at least one hydrogen atom is substituted with a chlorine atom or a phenyl radical, a has a value of from 1 to 2.5, b has a value of from 0.01 to 1.2, and the sum of a plus b has a value of from 1.8 to 3, (D) 1 to 30 parts by weight based on 100 parts by weight of combined (A) and (B), of a polymer selected from polyoxyalkylene-organosiloxane copolymers or poly(hydroxyalkyl)organosiloxanes, in which the oxyalkylene contains 2 or 3 carbon atoms, the hydroxyalkyl radicals contain 1 to 8 carbon atoms, the organic radicals are monovalent radicals selected from the group consisting of vinyl, phenyl, phenylethyl, 3,3,3-trifluoropropyl, and alkyl radicals containing 1 to 8 carbon atoms, and at least 50 percent of the organic radicals are alkyl radicals, and (E) 0.1 to 15 parts by weight based on 100 parts by weight of combined (A) and (B), of an organic peroxide.
Claim 3
Dependent Claim
135 words
The composition according to claim 1 in which (A) is present in an amount of from 90 to 50 parts by weight, (B) is present in an amount of from 10 to 50 parts by weight, the polydiorganosiloxane gum of (B) has a degree of polymerization of 1,000 to 10,000 and consists essentially of dimethylsiloxane units and methylvinylsiloxane units, (C) is present in an amount of from 1 to 12 parts by weight, the polyorganosiloxane of (C) has a viscosity at 25° C. of from 0.00005 to 0.1 m 2 /s, R is methyl, R' is an alkyl radical having from 4 to 20 carbon atoms, (D) is present in an amount of from 2 to 15 parts by weight, and (E) is present in an amount of from 1 to 10 parts by weight.
Claim 4
Dependent Claim
23 words
The composition according to claim 2 in which the polymer of (D) is a polyoxyalkylene-organosiloxane copolymer in which the organic radicals are methyl.
Claim 5
Dependent Claim
23 words
The composition according to claim 2 in which the polymer of (D) is a poly(hydroxyalkyl)organosiloxane consisting essentially of dimethylsiloxane units and methyl(ω-hydroxyalkyl)siloxane units.
Claim 6
Dependent Claim
14 words
The composition according to claim 4 in which the ω-hydroxyalkyl radicals are 3-hydroxypropyl radicals.
Claim 7
Dependent Claim
14 words
The composition according to claim 3 in which the organic peroxide is dicumyl peroxide.
Claim 8
Dependent Claim
14 words
The composition according to claim 4 in which the organic peroxide is dicumyl peroxide.
Claim 9
Independent Claim
374 words
A method of making a rubber comprising (I) thoroughly blending (A) 95 to 5 parts by weight of unvulcanized ethylene-propylene-diene terpolymer or ethylene-propylene copolymer, (B) 5 to 95 parts by weight of a polydiorganosiloxane gum in which the organic radicals are selected from methyl, vinyl, phenyl, and 3,3,3-trifluoropropyl, said organic radicals being at least 50 percent methyl based on the total number of organic radicals, a combination of (A) and (B) being 100 parts by weight, (C) 1 to 30 parts by weight of a polyorganosiloxane based on 100 parts by weight of combined (A) and (B), said polyorganosiloxane having an average unit formula ##EQU3## in which R represents a monovalent radical selected from the group consisting of vinyl, alkyl radicals of 1 to 3 carbon atoms, halogenated alkyl radicals of 1 to 3 carbon atoms, aryl radicals, halogenated aryl radicals, and alkyl radicals of 1 to 3 carbon atoms substituted with an aryl radical, R' represents a monovalent radical selected from the group consisting of aliphatic hydrocarbon radicals having from 4 to 20 carbon atoms and their derivatives in which at least one hydrogen atom is substituted with a chlorine atom or a phenyl radical, a has a value of from 1 to 2.5, b has a value of from 0.01 to 1.2, and the sum of a plus b has a value of from 1.8 to 3, (D) 1 to 30 parts by weight based on 100 parts by weight of combined (A) and (B), of a polymer selected from polyoxyalkylene-organosiloxane copolymers or a poly(hydroxyalkyl)organosiloxane, in which the oxyalkylene contains 2 or 3 carbon atoms, the hydroxyalkyl radicals contain 1 to 8 carbon atoms, the organic radicals are monovalent radicals selected from the group consisting of vinyl, phenyl, phenylethyl, 3,3,3-trifluoropropyl, and alkyl radicals containing 1 to 8 carbon atoms, and at least 50 percent of the organic radicals are alkyl radicals, and (E) 0.1 to 15 parts by weight based on 100 parts by weight of combined (A) and (B), of an organic peroxide, such that the temperature during the blending process when (E) is present is below the activation temperature of the organic peroxide, (II) heating the product obtained from (I) above the activation temperature of (E) to obtain a rubber.
Claim 10
Independent Claim
374 words
A method of making a rubber comprising (I) thoroughly blending (A) 95 to 5 parts by weight of unvulcanized ethylene-propylene-diene terpolymer or ethylene-propylene copolymer, (B) 5 to 95 parts by weight of a polydiorganosiloxane gum in which the organic radicals are selected from methyl, vinyl, phenyl, and 3,3,3-trifluoropropyl, said organic radicals being at least 50 percent methyl based on the total number of organic radicals, a combination of (A) and (B) being 100 parts by weight, (C) 1 to 30 parts by weight of a polyorganosiloxane based on 100 parts by weight of combined (A) and (B), said polyorganosiloxane having an average unit formula ##EQU3## in which R represents a monovalent radical selected from the group consisting of vinyl, alkyl radicals of 1 to 3 carbon atoms, halogenated alkyl radicals of 1 to 3 carbon atoms, aryl radicals, halogenated aryl radicals, and alkyl radicals of 1 to 3 carbon atoms substituted with an aryl radical, R' represents a monovalent radical selected from the group consisting of aliphatic hydrocarbon radicals having from 4 to 20 carbon atoms and their derivatives in which at least one hydrogen atom is substituted with a chlorine atom or a phenyl radical, a has a value of from 1 to 2.5, b has a value of from 0.01 to 1.2, and the sum of a plus b has a value of from 1.8 to 3, (D) 1 to 30 parts by weight based on 100 parts by weight of combined (A) and (B), of a polymer selected from polyoxyalkylene-organosiloxane copolymers or a poly(hydroxyalkyl)organosiloxane, in which the oxyalkylene contains 2 or 3 carbon atoms, the hydroxyalkyl radicals contain 1 to 8 carbon atoms, the organic radicals are monovalent radicals selected from the group consisting of vinyl, phenyl, phenylethyl, 3,3,3-trifluoropropyl, and alkyl radicals containing 1 to 8 carbon atoms, and at least 50 percent of the organic radicals are alkyl radicals, and (E) 0.1 to 15 parts by weight based on 100 parts by weight of combined (A) and (B), of an organic peroxide, such that the temperature during the blending process when (E) is present is below the activation temperature of the organic peroxide, (II) heating the product obtained from (I) above the activation temperature of (E) to obtain a rubber.
Claim 11
Dependent Claim
13 words
The method in accordance with claim 8 in which (E) is added last.
Claim 12
Dependent Claim
41 words
The method in accordance with claim 8 in which the product obtained from (I) is heated at a temperature of from 80° to 200° C. for 3 minutes to 3 hours at a pressure of 20 to 200 kg/cm 2 .
Claim 13
Dependent Claim
31 words
The method in accordance with claim 10 in which the product obtained is further vulcanized by heating at a temperature of from 80° to 200° C. for 1 to 48 hours.
Claim 14
Dependent Claim
9 words
A rubber obtained by the method of claim 8.
Claim 15
Dependent Claim
9 words
A rubber obtained by the method of claim 10.
Claim 16
Dependent Claim
9 words
A rubber obtained by the method of claim 11.
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) | 1985-07-26 | 1986-01-25 | 1986-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-26 | 1990-01-25 | 1990-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-26 | 1994-01-25 | 1994-07-27 | $7700.00 | Window Closed / Lapsed |