发明名称 |
Production method of expansion-molded article of polypropylene resin |
摘要 |
An expansion-molded article of a polypropylene resin is produced by filling pre-foamed particles of the polypropylene resin, which have a crystalline structure featuring an inherent peak inherent to the polypropylene resin and a high-temperature peak on the temperature side higher than the temperature corresponding to the inherent peak on a DSC curve obtained by differential scanning calorimetry of the pre-foamed particles and a bulk density of 0.04 g/cm3 or higher and require melting energy of 8-12 J/g at the high-temperature peak, in a mold without applying any pretreatment to the pre-foamed particles to build up an internal pressure therein, and then heating the pre-foamed particles, whereby the pre-foamed particles are caused to expand into the expansion-molded article conforming with the mold. The pre-foamed particles may alternatively have a bulk density lower than 0.04 g/cm3 and require melting energy of at least 8 J/g.
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申请公布号 |
US4777000(A) |
申请公布日期 |
1988.10.11 |
申请号 |
US19860934806 |
申请日期 |
1986.11.25 |
申请人 |
JAPAN STYRENE PAPER CORPORATION |
发明人 |
KUWABARA, HIDEKI;KANBE, MASATO |
分类号 |
C08J9/22;B29B9/16;B29B11/14;B29C44/00;B29K23/00;B29K105/04;C08J9/16;C08J9/232;(IPC1-7):C08J9/14;C08J9/18 |
主分类号 |
C08J9/22 |
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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