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US 3,965,054 AGranted
Foamable polyolefin composition and method for manufacturing foamed polyolefin
AssigneeFurukawa Electric Co., Ltd.
InventorsAkio Nojiri, Naonori Shiina, Hlroyuki Nakae, Hideyo Ueno, Isamu Namiki
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Abstract
The present invention provides a foamable polyolefin composition comprising a polyolefin, a crosslinking agent, a blowing agent decomposable at temperatures higher than the decomposition temperature of said crosslinking agent and a gas trapping agent as well as a method for manufacturing foamed polyolefin from said foamable polyolefin composition.
Claims17
A method for manufacturing foamed polyolefin comprising:
- a. mixing 100 parts polyolefin selected from the group consisting of ethylene homopolymer, ethylene copolymer, propylene homopolymer and propylene copolymer with 0.01 to 3 parts of cross-linking agent selected from the group consisting of organic peroxides, azide compounds and silicon-containing peroxides, 0.01 to 30 parts of blowing agent which decomposes at a temperature higher than the decomposition temperature of said cross-linking agent to evolve gas in a volume of not more than 2cc per gram of blowing agent in 2 minutes after heating to 180.degree.C begins in the thermal decomposition test, and 0.01 to 2 parts of gas trapping agent selected from the group consisting of a diallyl cyanurate, diallyl isocyanurate, triallyl cyanurate, and triallyl isocyanurate,
- b. shaping the mixture into a desired form and then
- c. heating the shaped mixture above the decomposition temperature of said blowing agent.
A foamable polyolefin composition comprising the following ingredients in the parts by weight specified:
- a. 100 parts polyolefin selected from the group consisting of ethylene homopolymer, ethylene copolymer, propylene homopolymer and propylene copolymer, said copolymers being composed mostly of said olefin,
- b. 0.01 to 3 parts of cross-linking agent selected from the group consisting of organic peroxides, azide compounds and silicon-containing peroxides,
- c. 0.1 to 30 parts of blowing agent which decomposes at a temperature higher than the decomposition temperature of said cross-linking agent to evolve gas in a volume of not more than 2cc per gram of the blowing agent in 2 minutes after heating to 180.degree.C begins in the thermal decomposition test, and
- d. 0.01 to 2 parts of a gas trapping agent selected from the group consisting of diallyl cyanurate, diallyl isocyanurate, triallyl cyanurate and triallyl isocyanurate acrylic or methacrylic acid with a polyol or polyoxy-benzene containing at least two acrylate or methacrylate groups, 1, 2-polybutadiene and triallyl phosphate.
1 more element
Dependencies are inferred from the claim text.