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    • 27. 发明申请
    • ADHESIVE CONTAINING BLOCK COPOLYMER
    • 含粘合剂嵌段共聚物
    • US20160122603A1
    • 2016-05-05
    • US14890336
    • 2014-05-09
    • KURARAY CO., LTD.
    • Kanayo NAKADAYoshihiro MORISHITA
    • C09J153/00C08F293/00
    • C09J153/00C08F4/52C08F293/005C08F297/026C08F220/14C08F2220/1825
    • Provided are an acrylic hot-melt adhesive that has both good hot-melt processability and good holding power, that is suitable for applications to a hot-melt coating method in which coating is performed at a low temperature at a high speed, that has good transparency and good weather resistance, and that further has good adhesiveness at low temperatures, and a block copolymer suitable for use in the adhesive. Prepared is an adhesive containing a block copolymer having at least one structure represented by a general formula: -[A1]-[B/A2]- (where, in the formula, [A1] represents a polymer block composed of a structural unit derived from a methacrylic acid ester (A1), [B/A2] represents a copolymer block composed of a structural unit derived from an acrylic acid ester (B) and a structural unit derived from a methacrylic acid ester (A2), and the copolymer block [B/A2] has a gradient copolymer block section in which a copolymerization ratio of the methacrylic acid ester (A2) continuously increases from a section connected to the polymer block [A1]), and having a total content of the structural units derived from the methacrylic acid ester (A1) and the methacrylic acid ester (A2) of 5% to 60% by mass, a weight-average molecular weight (Mw) of 30,000 to 300,000, and a molecular weight distribution (Mw/Mn) of 1.0 to 1.5.
    • 提供了具有良好的热熔加工性和良好的保持力的丙烯酸类热熔性粘合剂,适用于在低温下高速进行涂布的热熔涂布方法,具有良好的性能 透明性和耐候性良好,并且在低温下进一步具有良好的粘着性,以及适用于粘合剂的嵌段共聚物。 制备的是含有至少一种由以下通式表示的结构的嵌段共聚物的粘合剂: - [A1] - [B / A2] - (式中,[A1]表示由结构单元衍生的聚合物嵌段 甲基丙烯酸酯(A1),[B / A2]表示由来自丙烯酸酯(B)的结构单元和来自甲基丙烯酸酯(A2)的结构单元构成的共聚物嵌段,共聚物嵌段 [B / A2]具有梯度共聚物嵌段部分,其中甲基丙烯酸酯(A2)的共聚比从与聚合物嵌段[A1]连接的部分连续增加),并且具有衍生自 甲基丙烯酸酯(A1)和甲基丙烯酸酯(A2)为5〜60质量%,重均分子量(Mw)为30,000〜300,000,分子量分布(Mw / Mn)为1.0 到1.5。