| 摘要 |
PROBLEM TO BE SOLVED: To obtain a body sealer that hardly causes swelling and prevents a coating film from being deformed or cracked by deformation by thermal expansion of body and shock from the outside. SOLUTION: The urethane body sealer comprises a urethane resin composition composed of a urethane prepolymer, calcium carbonate, a tertiary amine catalyst and a plasticizer. The urethane prepolymer is obtained by reacting a polyol mixture that comprises a triol and a diol in the mass ratio of triol/diol of >5/5 and≤9.9/0.1 with a polyisocyanate in the molar ratio of the isocyanate group of the polyisocyanate to the hydroxy group of the polyol mixture of isocyanate group/hydroxy group=1.2-2.2. The urethane body sealer has JIS A hardness of 30-100 after curing. The method for sealing an automobile body is provided. COPYRIGHT: (C)2008,JPO&INPIT
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