Process for producing aqueous Dispersion-Type Acrylic Polymer, the acrylic polymer obtained thereby, and pressure-sensitive adhesive comprising the acrylic polymer.

摘要

A process for producing an aqueous dispersion-type acrylic polymer is disclosed, which comprises introducing a monomer comprising an alkyl (meth)acrylate as the main component into a polymerization vessel at a time at a monomer concentration of 40% by weight or higher, adding a water-soluble radical polymerization initiator thereto in an amount of from 0.001 to 0.05 parts by weight per 100 parts by weight of the monomer, and emulsion-polymerizing the monomer substantially at 20 to 60 DEG C. The aqueous dispersion-type acrylic polymer thus obtained satisfies the equation log M>3log S-2, wherein S is a tetrahydrofuran (THF)-soluble content (wt%) of the polymer and M is a weight-average molecular weight (x10,000) of a soluble part of the polymer. This polymer is preferably used for a pressure-sensitive adhesive in pressure-sensitive adhesive-covered products.