发明授权
US6048608A Opaque oriented polypropylene film 失效
不透明取向聚丙烯薄膜

Opaque oriented polypropylene film
摘要:
The present invention relates to an opaque, biaxially oriented polymeric film having a thermoplastic polymer matrix material within which is located a stratum of voids. The voids are formed during orientation by a cavitating agent which is a particle of a cyclic olefinic copolymer. The solid particle is phase-distinct and incompatible with the matrix material.
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