| 摘要 |
PURPOSE:To improve breaking extension and tensile modulus without lowering the breaking extension of a polypropylene stretched material by stretching isotactic polyproplyene containing a beta-crystal system crystallization nucleus agent at specific temp. CONSTITUTION:Isotactic polypropylene containing a beta-crystal system crystallization nucleus agent is stretched at 40-120 deg.C). As a concrete examaple of isotactic polypropylene, a propylene homopolymer or a random or block copolymer of propylene and other olefin such as ethylene or butene-1 can be used. As the beta-crystal system crystallization nucleus agent, for example, quianacridon or gamma-quinacridone is designated and quinacridone is especially pref. because a beta-crystal system is formed in much quantity by a small addition amt. |
