US4910267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil-resistant and anti-degrading rubber article
Assignee: Zeon Corp
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Filing: 1988-02-10
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Granted: 1990-03-20
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Expires: 2008-02-10
Abstract
Abstract An anti-degrading rubber article to be used in contact with a mineral oil containing an oil modifier, at least that surface of said rubber article which is to come into contact with said mineral oil being composed substantially of a vulcanization product, obtained by using a sulfur vulcanization system, of a copolymer rubber having polymer chains consisting of (1) 10 to 60% by weight of units derived from an unsaturated nitride, (2) 2 to 30% by weight of units derived from a conjugated diene, and (3) 88 to 10% by weight of units derived from a copolymerizable ethylenically unsaturated monomer other than the unsaturated nitride and/or units resulting from the hydrogenation of units derived from a conjugated diene.
Inventors
- 👤 Motofumi Oyama
- 👤 Yoichiro Kubo
- 👤 Toshiharu Honda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:35
CPC Classifications
C; C08; C08L; C08L9/00; C08L9/02; C08K; C08K5/00; C08K5/0008; C08K5/0025
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
243 words
A method of preventing degradation of rubber articles caused by load-carrying additives or detergent-dispersants contained in a mineral oil when the rubber articles are in contact with the mineral oil containing said load-carrying additives or detergent-dispersants for an extended period which method comprises forming at least the surface of said rubber article from a sulfur-vulcanized product of a copolymer rubber having polymer chains consisting of: (1) 20 to 50% by weight of units derived from an unsaturated nitrile selected from the group consisting of acrylonitrile and methacrylonitrile; (2) 2 to 20% by weight of units derived from a conjugated diene selected from the group consisting of butadiene, isoprene and 1,3-pentadiene; and (3) 78 to 40% by weight of at least one member of the group consisting of units derived from unsaturated carboxylic acids, alkyl esters of unsaturated carboxylic acids, alkoxy alkyl acrylates, allyl glycidyl ether, vinyl chloroacetate, ethylene, butene-1 and isobutylene and units resulting from the hydrogenation of units derived from a conjugated diene, whereby the resistance to degradation of the rubber article due to said load-carrying additives or detergent-dispersants is such that the rubber articles can be dipped in the mineral oil containing load-carrying additive or detergent-dispersant at a temperature of 150° C. for at least 28 days before the rubber article in the swollen state, when bent through 180° will develop cracks, and contacting at least the surface of the rubber article with said mineral oil containing load-carrying additives or detergent-dispersants.
Claim 2
Independent Claim
243 words
A method of preventing degradation of rubber articles caused by load-carrying additives or detergent-dispersants contained in a mineral oil when the rubber articles are in contact with the mineral oil containing said load-carrying additives or detergent-dispersants for an extended period which method comprises forming at least the surface of said rubber article from a sulfur-vulcanized product of a copolymer rubber having polymer chains consisting of: (1) 20 to 50% by weight of units derived from an unsaturated nitrile selected from the group consisting of acrylonitrile and methacrylonitrile; (2) 2 to 20% by weight of units derived from a conjugated diene selected from the group consisting of butadiene, isoprene and 1,3-pentadiene; and (3) 78 to 40% by weight of at least one member of the group consisting of units derived from unsaturated carboxylic acids, alkyl esters of unsaturated carboxylic acids, alkoxy alkyl acrylates, allyl glycidyl ether, vinyl chloroacetate, ethylene, butene-1 and isobutylene and units resulting from the hydrogenation of units derived from a conjugated diene, whereby the resistance to degradation of the rubber article due to said load-carrying additives or detergent-dispersants is such that the rubber articles can be dipped in the mineral oil containing load-carrying additive or detergent-dispersant at a temperature of 150° C. for at least 28 days before the rubber article in the swollen state, when bent through 180° will develop cracks, and contacting at least the surface of the rubber article with said mineral oil containing load-carrying additives or detergent-dispersants.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein the oil modifier is a load-carrying additive, a detergent-dispersant, or both.
Claim 4
Dependent Claim
38 words
The method of claim 2 wherein the oil modifier is the load-carrying additive which is at least one compound selected from the group consisting of organic sulfur compounds, organic halogen compounds, organic phosphorus compounds and organic metal compounds.
Claim 5
Dependent Claim
59 words
The method of claim 2 wherein the oil modifier is the detergent-dispersant which is at least one compound selected from the group consisting of long-chain alkenylsuccinimide compounds, long-chain alkenylsuccinic acid esters, long-chain alkenylphosphonic acid derivatives, polyalkylene glycol carbonates, polyalkylene glycol carbamates, sulfonates, phenates, salicylates, naphthenates, hydroxybenzylamine derivatives and multipolar polymers composed of units of O- or N-containing vinyl monomers.
Claim 6
Dependent Claim
45 words
The method of claim 1 wherein the units (3) are selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, maleic acid, methyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, methoxyethyl acrylate, ethoxyethyl acrylate, methoxyethoxyethyl acrylate, allyl glycidyl ether, vinyl chloroacetate, ethylene, butene-1 and isobutylene.
Claim 7
Dependent Claim
29 words
The method of claim 1 wherein the units (3) derived from a copolymerizable ethylenically unsaturated monomer are units resulting from the hydrogenation of units derived from a conjugated diene.
Claim 8
Dependent Claim
73 words
The method of claim 1 wherein the copolymer rubber is a rubber selected from the group consisting of an hydrogenated butadiene-acrylonitrile copolymer rubber, an hydrogenated isoprene-acrylonitrile copolymer rubber, an hydrogenated butadiene-isoprene-acrylonitrile copolymer rubber, butadiene-methylacrylate-acrylonitrile copolymer rubber, an hydrogenation product of a butadiene-methylacrylate-acrylonitrile copolymer rubber, butadiene-acrylic acid-acrylonitrile copolymer rubber, butadiene-butylacrylate-acrylonitrile copolymer rubber, an hydrogenation product of a butadiene-acrylic acid acrylonitrile copolymer rubber, butadiene-ethylene-acrylonitrile copolymer rubber, and an hydrogenation product of a butadiene-ethylene-acrylonitrile copolymer rubber.
References Cited (Backward Citations)
US3976625A
Cited
US4404329A
Cited
US4337329A
Cited
US4384081A
Cited
US4350796A
Cited
US4405756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-19 | 1993-09-18 | 1994-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-19 | 1997-09-18 | 1998-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-19 | 2001-09-18 | 2002-03-20 | $7700.00 | Window Closed / Lapsed |