Method of crosslinking rubber and plastic moldings
AssigneeSumitomo Chemical Company, Limited
InventorsYoshihiko Kitagawa, Tadashi Jinno, Masashi Aoshima, Taisuke Okita, Hideo Shinonaga, Kaoru Kitadono
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Abstract
A method of crosslinking a rubber or plastic molding is described, which comprises irradiating the molding with electron beams to thereby limitedly crosslink only the surface of the molding. The molding thus-treated has excellent shape-sustaining properties and good surface appearance. Thus it is expected to find many applications in various fields.
Claims12
A process for producing an expanded rubber molding having a smooth surface, comprising:
- (1) extruding continously a non-crosslinked rubber molding consisting essentially of a rubber selected from the group consisting of styrene-butadiene rubber, polyisoprene rubber, polychloroprene rubber, acrylonitrile-butadiene rubber, polybutadiene rubber, ethylene-.alpha.-olefin rubber, ethylene-.alpha.-olefin-non-conjugated diene rubber, natural rubber, chlorinated polyethylene and chlorosulfonated polyethylene, a crosslinking agent selected from the group consisting of sulfur, peroxides and quinoids, and a blowing agent;
- (2) irradiating continuously with electron beams at an electron voltage of from 10 kV to 500 kV and at a dose of from 1 Mrad to 30 Mrad to form a crosslinked skin from the surface of the extruded molding of step (1);
- and
- (3) heating continuously the resulting molding to perform crosslinking with the crosslinking agent and expansion with the blowing agent simultaneously.
An expanded rubber molding having a smooth surface, which is produced by a process comprising:
- (1) extruding continuously a non-crosslinked rubber molding consisting essentially of a rubber selected from the group consisting of styrene-butadiene rubber, polyisoprene rubber, polychloroprene rubber, acrylonitrile-butadiene rubber, polybutadiene rubber, ethylene-.alpha.-olefin rubber, ethylene-.alpha.-olefin-non-conjugated diene rubber, natural rubber, chlorinated polyethylene and chlorosulfonated polyethylene, a crosslinking agent selected from the group consisting of sulfur, peroxides, and quinoids, and a blowing agent;
- (2) irradiating continuously with electron beams at an electron voltage of from 10 kV to 500 kV and at a dose of from 1 Mrad to 30 Mrad to form a crosslinked skin from the surface of the extruded molding to step (1);
- and
- (3) heating continuously the resulting molding to perform crosslinking with the crosslinking agent and expansion with the blowing agent simultaneously.
A process for producing an expanded rubber molding having a smooth surface, consisting essentially of:
- (1) extruding continously a non-crosslinked rubber molding consisting essentially of a rubber selected from the group consisting of styrene-butadiene rubber, polyisoprene rubber, polychloroprene rubber, acrylonitrile-butadiene rubber, polybutadiene rubber, ethylene-.alpha.-olefin rubber, ethylene-.alpha.-olefin-non-conjugated diene rubber, natural rubber, chlorinated polyethylene and chlorosulfonated polyethylene, a crosslinking agent selected from the group consisting of sulfur, peroxides and quinoids, and a blowing agent;
- (2) irradiating continuously with electron beams at an electron voltage of from 10 kV to 500 kV and at a dose of from 1 Mrad to 30 Mrad to form a crosslinked skin from the surface of the extruded molding of step (1);
- and
- (3) heating continuously the resulting molding to perform crosslinking with the crosslinking agent and expansion with the blowing agent simultaneously.
An expanded rubber molding having a smooth surface, which is produced by a process consisting essentially of:
- (1) extruding continuously a non-crosslinked rubber molding consisting essentially of a rubber selected from the group consisting of styrene-butadiene rubber, polyisoprene rubber, polychloroprene rubber, acrylonitrile-butadiene rubber, polybutadiene rubber, ethylene-.alpha.-olefin rubber, ethylene-.alpha.-olefin-non-conjugated diene rubber, natural rubber, chlorinated polyethylene and chlorosulfonated polyethylene, a crosslinking agent selected from the group consisting of sulfur, peroxides, and quinoids, and a blowing agent;
- (2), irradiating continuously with electron beams at an electron voltage of from 10 kV to 500 kV and at a dose of from 1 Mrad to 30 Mrad to form a crosslinked skin from the surface of the extruded molding of step (1);
- and
- (3) heating continuously the resulting molding to perform crosslinking with the crosslinking agent and expansion with the blowing agent simultaneously.
Dependencies are inferred from the claim text.