发明名称 |
Polypropylene resin prefoamed particles |
摘要 |
Prefoamed particles consisting essentially of an ethylene/propylene random copolymer, wherein said prefoamed particles are obtained by foaming particles of an ethylene/propylene random copolymer containing 1 to 4% by weight of random-copolymerized ethylene at a temperature in the range of from Tm - 15 DEG C. to Tm - 5 DEG C. (in which Tm is a temperature at which to terminate melting of the copolymer) and within the range of 141 DEG to 151 DEG C., and wherein said prefoamed particles have a crystal structure characterized in that in a DSC curve obtained by heating 1 to 3 mg of the copolymer prefoamed particles to 220 DEG C. at a heating rate of 10 DEG C./min. with a differential scanning calorimeter, there appear a peak (characteristic peak) characteristic of the copolymer and another peak (high temperature peak) at a higher temperature than a temperature at which the characteristic peak appears.
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申请公布号 |
US4840973(A) |
申请公布日期 |
1989.06.20 |
申请号 |
US19870082560 |
申请日期 |
1987.08.07 |
申请人 |
JAPAN STYRENE PAPER CORPORATION |
发明人 |
KUWABARA, HIDEKI;YOSHIMURA, SHOHEI |
分类号 |
C08J9/18;C08J9/228 |
主分类号 |
C08J9/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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