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Rubber composition
| Details |
Inventors: Kondo, Takeo; Miyagawa, Jiro; Shinohara, Katsuaki;
Assignee: Denki Kagaku Kogyo Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Marquis; Melvyn I.
Assistant Examiner: Dean; Karen A.
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt
A rubber composition obtained by curing with a peroxide a blend comprising 100 parts by weight of an acrylic elastomer and from 20 to 100 parts by weight of a polyvinylidene fluoride resin relative to 100 parts by weight of the acrylic elastomer. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The acrylic elastomer to be used for the rubber composition of the present invention is preferably an elastomer obtained by polymerizing from 80 to 100% by weight of an alkoxyalkyl acrylate, from 0 to 20% by weight of acrylonitrile, from 0 to 5% by weight of ethylene and from 0 to 5% by weight of a vinyl fatty acid.
A preferred acrylic elastomer is the one obtained by polymerizing from 80 to 100% by weight of an alkoxyalkyl acrylate and from 0 to 20% by weight of acrylonitrile.
A praticularly preferred acrylic elastomer is the one obtained by polymerizing from 85 to 95% by weight of an alkoxyalkyl acrylate and from 5 to 15% by weight of acrylonitrile.
The respective components of the acrylic elastomer will be described.
The alkoxyalkyl acrylate may preferably be 2-methoxymethyl acrylate, 2-ethoxymethyl acrylate, 2-methoxyethyl acrylate, 2-ethoxyethyl acrylate and 2-butoxyethyl acrylate.
Acrylonitrile is effective for improvement of the fuel oil resistance of the rubber composition.
However, if it exceeds 20% by weight, the cold resistance of the composition deteriorates.
Ethylene is effective for improvement of the cold resistance of the rubber composition.
However, if it exceeds 5% by weight, the fuel oil resistance deteriorates.
The vinyl fatty acid is effective for improvement of the fuel oil resistance and heat resistance of the rubber composition.
However, if it exceeds 5% by weight, the cold resistance and the alcohol-added fuel oil resistance deteriorate.
The polyvinylidene fluoride resin to be used in the present invention includes polyvinylidene fluoride on a copolymer of vinylidene fluoride with other copolymerizable monomers.
Such other copolymerizable monomers include hexafluoropropylene, pentafluoropropylene, trifluoroethylene, trifluorochloroethylene, tetrafluoroethylene, vinyl fluoride, perfluoro(methyl vinyl ether), perfluoro(propyl vinyl ether), other olefins and acrylic acid esters.
One or more such copolymerizable monomers may be employed for the copolymerization
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