申请人:KANEKA CORPORATION
公开号:EP1475397A1
公开(公告)日:2004-11-10
The present invention relates to a block copolymer (A) including a (meth)acrylic polymer block (a) and an acrylic polymer block (b). The (meth)acrylic polymer block (a) is preferably copolymerized with a monomer having a functional group having high cohesive force, such as a carboxyl group, so that the 5%-weight-loss temperature is 300°C or more or the tensile strength is 3 MPa or more, and the hardness measured by a type A durometer according to JIS K6253 is 50 or less, and a compression set measured after 22 hours at 70°C is 45% or less. The block copolymer (A) exhibits excellent thermal decomposition resistance and low compression set at high temperatures. The block copolymer (A) can be used as a soft material for automobile, and has low hardness, high adhesion, high oil resistance, high weather resistance, high heat resistance, high recycling property, high tensile properties; and high wax remover resistance.
本发明涉及一种嵌段共聚物(A),包括(甲基)丙烯酸聚合物嵌段(a)和丙烯酸聚合物嵌段(b)。(甲基)丙烯酸聚合物嵌段(a)最好与具有高内聚力官能团(如羧基)的单体共聚,从而使 5%失重温度为 300°C 或以上,或拉伸强度为 3 MPa 或以上,且根据 JIS K6253 用 A 型硬度计测量的硬度为 50 或以下,在 70°C 下 22 小时后测量的压缩永久变形为 45% 或以下。嵌段共聚物(A)具有优异的抗热分解性能,高温下的压缩永久变形小。嵌段共聚物(A)可用作汽车软质材料,具有低硬度、高附着力、高耐油性、高耐候性、高耐热性、高回收性、高拉伸性和高抗脱蜡性。