Acrylic Acid → Acrylic Acid

Participants

Reaction Steps

100 parts by weight of butyl acrylate, 5 parts by weight of acrylic acid, 0.075 parts by weight of 2-hydroxyethyl acrylate, 0.3 parts by weight of 2,2-azobisisobutyronitrile, and ethyl acetate were added to a reactor vessel equipped with a cooling tube, a nitrogen introducing tube, a thermometer, and a stirrer so that a solution was formed. While nitrogen gas was blown into the solution, the solution was then subjected to a polymerization reaction at 60° C. for 4 hours to give an acrylate copolymer of butyl acrylate, acrylic acid and 2-hydroxyethyl acrylate with a weight average molecular weight of 2,200,000. The acrylate copolymer was diluted with ethyl acetate to form a polymer solution (2-A) with a total solids content of 30% by weight. To the polymer solution (2-A) were then added 0.6 parts by weight of a crosslinking agent mainly composed of an isocyanate group-containing compound (“Coronate L” (trade name) manufactured by Nippon Polyurethane Industry Co., Ltd.) and 0.075 parts by weight of γ-glycidoxypropyltrimethoxysilane (“KBM-403” (trade name) manufactured by Shin-Etsu Chemical Co., Ltd.) in this order, based on 100 parts by weight of the acrylate copolymer, so that a polymer solution (2-B) was prepared.

Provenance & Evidence