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Vulcanizable-rubber-composition-for-use-as-hot-water-seals

Compound for pinhole-free rotational casting

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Novel catalyst for producing relatively narrow molecular weight distribution olefin polymers

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OF PREFERRED EMBODIMENTS In accordance with the present invention, by performing a random ...

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All reference to the Periodic Table of the Elements herein shall refer to the Periodic Table of ...

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OF THE INVENTION As indicated above, the present invention relates to a novel crosslinkable ...

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All reference to the Periodic Table of the Elements herein shall refer to the Periodic Table of ...

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Method for preparing ethylene copolymer

What is claimed is: 1. A method for preparing an ethylene copolymer which comprises the step of ...

Ethylene-aromatic vinyl compound copolymer and method for its production

It is an object of the present invention to provide an ethylene-aromatic vinyl compound copolymer ...

Vulcanizable rubber composition for use as hot-water seals

Details

Inventors: Aimura, Yoshiaki; Ohnishi, Hiroko;
Assignee: Nippon Zeon Co Ltd (Tokyo, JP)
Primary Examiner: Cain; Edward J.
Assistant Examiner:
Attorney, Agent or Firm:

This invention provides a vulcanizable rubber composition for use as hot-water seals comprising 100 parts by weight of a rubber mixture composed of 90 to 50% by weight of a nitrile-containing highly saturated copolymer rubber obtained by hydrogenating the conjugated diene portions of an unsaturated nitrile-conjugated diene copolymer rubber or unsaturated nitrile-conjugated diene-ethylenically unsaturated monomer terpolymer rubber, and 10 to 50% by weight of an ethylene-.alpha.-olefin copolymer rubber; 0.1 to 30 parts by weight of an organic peroxide vulcanizing agent; and optionally 10 to 100 parts by weight of carbon black. Seals formed by vulcanizing this composition show a very low percent change in volume and elongation, and are not liable to the release of carbon black or the production of surface cracks, upon exposure to hot water containing bleaching powder.

DETAILED DESCRIPTION We claim: 1.
A vulcanizable rubber composition for use as hot-water seals comprising 100 parts by weight of a rubber mixture composed of 90 to 50% by weight of a nitrile-containing highly saturated copolymer rubber having an iodine value of not greater than 80 obtained by hydrogenating the conjugated diene portions of an unsaturated nitrile-conjugated diene copolymer rubber of unsaturated nitrile-conjugated diene-ethylenically unsaturated monomer terpolymer rubber, and 10 to 50% by weight of an ethylene-.
alpha.
-olefin copolymer rubber, wherein the sum of these components is 100% by weight; and 0.
1 to 30 parts by weight of an organic peroxide vulcanizing agent.
2.
A vulcanizable rubber composition for use as hot-water seals as claimed in claim 1 wherein the unsaturated nitrile in the unsaturated nitrile-conjugated diene copolymer rubber or unsaturated nitrile-conjugated diene-ethylenically unsaturated monomer terpolymer rubber is selected from the group consisting of acrylonitrile, methacrylonitrile and .
alpha.
-chloroacrylonitrile.
3.
A vulcanizable rubber composition for use as hot-water seals as claimed in claim 1 wherein the conjugated diene in the unsaturated nitrile-conjugated diene copolymer rubber or unsaturated nitrile-conjugated diene-ethylenically unsaturated monomer terpolymer rubber is selected from the group consisting of 1,3-butadiene, 2,3-dimethylbutadiene, isoprene and 1,3-pentadiene.
4.
A vulcanizable rubber composition for use as hot-water seals as claimed in claim 1 wherein the unsaturated nitrile-conjugated diene copolymer rubber or unsaturated nitrile-conjugated diene-ethylenically unsaturated monomer terpolymer rubber is an unsaturated nitrile-conjugated diene-unsaturated dicarboxylic acid ester terpolymer rubber.
5.
A vulcanizable rubber composition for use as hot-water seals as claimed in claim 1 wherein the unsaturated nitrile-conjugated diene-ethylenically unsaturated monomer terpolymer rubber has 10 to 50% by weight of unsaturated nitrile units and 1 to 80% by weight of unsaturated dicarboxylic acid ester units

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