发明授权
US5068155A Opaque, laminated and stretched products, and method for making them
失效
OPAQUE,层压和拉伸产品及其制造方法
- 专利标题: Opaque, laminated and stretched products, and method for making them
- 专利标题(中): OPAQUE,层压和拉伸产品及其制造方法
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申请号: US567730申请日: 1990-08-15
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公开(公告)号: US5068155A公开(公告)日: 1991-11-26
- 发明人: Kazuhiro Yamada , Tadao Ishibashi
- 申请人: Kazuhiro Yamada , Tadao Ishibashi
- 申请人地址: JPX Osaka
- 专利权人: Chisso Corporation
- 当前专利权人: Chisso Corporation
- 当前专利权人地址: JPX Osaka
- 优先权: JPX1-222456 19890829
- 主分类号: B29C55/02
- IPC分类号: B29C55/02 ; B29K23/00 ; B29L9/00 ; B32B27/32
摘要:
Opaque laminated and stretched products having a total light transmittance of 50% or less are obtained by laminating at least one side of a layer obtained from a composition in which a crystalline polypropylene is blended with a cyclopentadiene type petroleum resin having a softening point of 160.degree. C. or higher, as measured by the ring-and-ball method, in an amount of 3 to 30% by weight based on the total weight of both, with a layer obtained from a crystalline propylene copolymer having a crystalline melting point lower than that of said crystalline polypropylene by 10.degree. C. or more, and, then, stretching the resulting laminate at a temperature lower than the crystalline melting point of the crystalline polypropylene and the softening point of the cyclopentadiene type petroleum resin and at a stretching ratio of 2 or higher in at least a uniaxial direction.