| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for producing a polymer product that can be a raw material of a pressure-sensitive adhesive with excellent initial adhesiveness and stress relaxation properties and includes a high molecular weight polymer and a low molecular weight polymer in one polymer product, wherein the amount of the low molecular weight polymer is relatively high. <P>SOLUTION: A method for producing an acrylic polymer including a low molecular weight polymer and a high molecular weight polymer, wherein the amount of the low molecular weight polymer is higher, includes initiating polymerization in the presence of an acrylic monomer and a polymerization initiator and then adding 0.1-10 mass% of a chain transfer agent relative to the total monomers in one lump or within 60 minutes, when the rate of polymerization of the monomer is 5-40% relative to the total monomer amount used. An acrylic polymer is obtained by the method. An acrylic pressure-sensitive adhesive composition utilizes the acrylic polymer. <P>COPYRIGHT: (C)2012,JPO&INPIT |
