Title: Block polymer, thermoplastic addition polymer, production process, and use
Application Number: 94191285 Application Date: 1994.12.22
Publication Number: 1118167 Publication Date: 1996.03.06
Approval Pub. Date: 2002.01.16 Granted Pub. Date: 2002.01.16
International Classifi-cation: C08F293/00;C08G75/14;C08L53/00;C09J133/06;C09J153/00;C09J201/00;C09J201/02
Applicant(s) Name: Nippon Shokubai Co., ltd. Address:
Inventor(s) Name: Masatoshi Yoshida;Nobuhiro Kobayashi;Hiroaki Haseg
Attorney & Agent: LIU LIPING
Abstract:
    An inexpensive block polymer which is effectively available in various uses with regard to hot-melt resin compositions, pressure sensitive adhesives, carriers for pressure sensitive adhesives, and the like. This block polymer has a structure including a polyvalent mercaptan segment at its center from which two or more polymer segments are radially extended. The number-average molecular weight of this polymer is in a range of 2,000 to 1,000,000, and the two or more polymer segments have two or more different compositions. This block polymer is obtainable by a process including two or more steps of radical polymerization of polymerizable monomer components having different compositions using a polyvalent mercaptan as a polymerization initiator.
Time: 5