Block polymer thermoplastic addition polymer and their productio

Details Block polymer thermoplastic addition polymer and their productio Block polymer thermoplastic addition polymer and their productio

1997-06-10

1999-02-09

Nutter, Nathan M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528374, 528376, C07K 100

Patent

active

058695982

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.

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"Living Radical Polymerization in Homogeneous System with Phenylazotriphenylmethane as a Thermal Iniferter", Poly. Bull., Vol. 16, pp. 277-284, (1986).

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