发明公开
EP0415270A3 Opaque, laminated and stretched products and method for making them 失效
OPAQUE,LAMINATED和STRETCHED产品及其制造方法

Opaque, laminated and stretched products and method for making them
摘要:
Opaque laminated and stretched products having a total light transmittance of 50 % or less are obtained 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 °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 °C or more, and, then, stretching the resuting 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.
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