PURPOSE: To provide the title agent which forms readily releasable film even after long storage under high temperature and high humidity, prepared by adding a polyisocyanate compd. to an acrylic or alkyd resin modified with a specified organopolysiloxane.
CONSTITUTION: An acrylic or alkyd resin is modified with an organopolysiloxane in which a phenyl group accounts for 15W50mol% of organic groups linked to Si in one molecule and at least one of the remaining organic groups is a hydroxyl group-substitd. organic group of the formula (where R is divalent hydrocarbon group; a is 0W1). Polyisocyanate compd. (e.g. tolylene diisocyanate, hexamethylene diisocyanate) is added in an amount of 5W45pts.wt. to 100pts.wt. resultant silicon-modified acrylic or alkyd resin.
KOBORI TAKAHIDE
YAMAMOTO HITOSHI
MORI FUMIAKI
TOKUSHIMA SEIYU KK