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    • 81. 发明授权
    • Polystyrenic stretched film and process for producing the polystyrenic
stretched film
    • 聚苯乙烯拉伸膜和聚苯乙烯拉伸膜的制造方法
    • US5837384A
    • 1998-11-17
    • US669387
    • 1996-07-16
    • Keisuke FunakiTakaaki Uchida
    • Keisuke FunakiTakaaki Uchida
    • B29C55/02B29C55/12B29C71/00B29C71/02B29K25/00C08J5/18C08L25/00B29L7/00
    • B29C55/12C08J5/18B29C71/00B29C71/02B29K2025/00C08J2325/00Y10S428/91Y10T428/31855Y10T428/31931Y10T428/31938
    • There are disclosed a polystyrenic stretched film which comprises a styrenic resin composition containing 70 to 100% by weight of a styrenic polymer having a high degree of the syndiotactic configuration, has a crystallinity of 35% or more, and contains 200 ppm or less of residual monomer components and 1000 or less of particles of foreign substances having a size of 9 .mu.m or larger in 1 cm.sup.3, and a process for producing the polystyrenic stretched film which comprises extruding the styrenic resin composition in a specific amount in combination with melt filtration of the composition, cooling the extruded composition, biaxially stretching the cooled composition, and heat treating the stretched composition under the condition that the degree of heat treatment is 10.sup.-1 or more and less than 5.times.10.sup.2. According to the present invention, a stretched film having excellent printing property and other properties, such as a high peeling strength after vapor deposition, and a process for efficiently producing the polystyrenic stretched film having the excellent properties are provided.
    • PCT No.PCT / JP95 / 02430 Sec。 371日期:1996年7月16日 102(e)日期1996年7月16日PCT提交1995年11月29日PCT公布。 WO96 / 17005 PCT出版物 日本1996年6月6日公开了一种聚苯乙烯拉伸膜,其包含含有70〜100重量%的具有高间隔构型的苯乙烯类聚合物的苯乙烯类树脂组合物,结晶度为35%以上,含有200 ppm以下的残留单体成分和1000个以下的1cm 3以上的尺寸为9μm以上的异物粒子,以及聚苯乙烯拉伸膜的制造方法,其特征在于,将苯乙烯类树脂组合物以特定量的量挤出 与组合物的熔融过滤组合,冷却挤出的组合物,双轴拉伸冷却的组合物,并在热处理度为10-1以上且小于5×102的条件下热处理拉伸的组合物。 根据本发明,提供了具有优异的印刷性能和其它性能的拉伸膜,例如气相沉积后的高剥离强度,以及有效制备具有优异性能的聚苯乙烯拉伸膜的方法。