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    • 11. 发明申请
    • Block copolymer and composition thereof
    • 嵌段共聚物及其组合物
    • US20050222331A1
    • 2005-10-06
    • US10512410
    • 2003-04-23
    • Susumu HoshiMasahiro MoriYukio YamauraToshinori Shiraki
    • Susumu HoshiMasahiro MoriYukio YamauraToshinori Shiraki
    • B32B27/08C08F8/04C08F297/04C08G81/02C08J5/18C08K5/134C08K5/372C08L53/02C08L53/00
    • B32B27/08B32B7/02B32B27/302B32B2307/736C08F8/04C08F297/04C08G81/028C08J5/18C08J2353/02C08K5/1345C08K5/372C08L53/02C08L53/025C08L2666/04C08L2666/24C08L2666/02
    • The present invention provides a block copolymer or a hydrogenated product thereof excellent in low-temperature shrinkability, natural shrinkability, rigidity and the like, excellent in a balance of physical properties such as blocking resistance, resistance to fusion bonding in hot water, impact resistance and the like, and having a few fish eyes (FE's) caused by gels. Further, the invention provides a heat shrinkable film and a heat shrinkable multilayer film suitable for drink container packaging, cap seals and the like, using such a block copolymer or the hydrogenated product thereof. The invention provides a block copolymer having a weight ratio of a vinyl aromatic hydrocarbon and a conjugated diene of 60/40 to 90/10 and a number average molecular weight measured by gel permeation chromatography (GPC) of 30,000 to 500,000, wherein the vinyl aromatic hydrocarbon constituting the block copolymer has a block rate of from 10 to 90% by weight, the vinyl aromatic hydrocarbon polymer blocks constituting the block copolymer have a peak molecular weight within the molecular weight range of 5,000 to 30,000, and 40 to 80% by weight of the vinyl aromatic hydrocarbon polymer blocks have a molecular weight of 35,000 or less.
    • 本发明提供了低温收缩性,天然收缩性,刚性等优异的嵌段共聚物或氢化物,其耐热性,耐热熔融粘合性,耐冲击性等耐物理性能的平衡优异, 并且由凝胶引起的几条鱼眼(FE)。 此外,本发明提供了一种适用于饮料容器包装,帽密封等的热收缩膜和热收缩多层膜,使用这种嵌段共聚物或其氢化产物。 本发明提供一种乙烯基芳香族烃和共轭二烯的重量比为60/40〜90/10的嵌段共聚物,通过凝胶渗透色谱法(GPC)测定的数均分子量为30,000〜500,000,其中乙烯基芳香族 构成嵌段共聚物的烃的嵌段率为10〜90重量%,构成嵌段共聚物的乙烯基芳香族烃聚合物嵌段的分子量范围为5000〜30,000,峰值分子量为40〜80重量% 的乙烯基芳烃聚合物嵌段的分子量为35,000以下。