| 摘要 |
(A) a polycarbonatediol, (B) a trifunctional alcohol, and (C) a diisocyanate are subjected to reaction in the presence of (D) a (meth)acrylate compound represented by the general formula CH<SUB>2</SUB>-CRCO(OC<SUB>n</SUB>H<SUB>2n</SUB>)<SUB>p</SUB>R' or CH<SUB>2</SUB>-CRCO(OC<SUB>m</SUB>H<SUB>2m</SUB>)<SUB>q</SUB>OCOCH-CH<SUB>2</SUB>, and (E) a di(meth)acrylate compound of alkylene glycol whose alkylene group is substituted as a lower alkyl group, and then (F) a hydroxyl group-containing (meth)acrylate is added to the resulting solution of urethane oligomers in (meth)acrylate to conduct terminal (meth)acrylating reaction of the urethane oligomers, thereby producing a UV-curable liquid polyurethane resin having a viscosity (25° C.) of preferably 150,000-1,000,000 mPa.s, where before or after the terminal (meth)acrylating reaction of the urethane oligomers (G) a photopolymerization initiator and (H) a hindered phenol-based antioxidant having a molecular weight of 500-2,000 are added thereto to form the UV-curable liquid polyurethane resin. The TV-curable liquid polyurethane resin can produce HDD gaskets, etc. in a cross-sectional shape with a good sealability by an automatic coating robot efficiently.
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