Patent ID: 6908951

Claim:
An expandable coating composition which can produce an expanded coating film and which contains (a) a polyol compound, (b) an isocyanate compound, and (c) water; wherein the (a) polyol compound reacts with a part of the (b) isocyanate compound, thereby yielding polyurethane resin; the remaining (b) isocyanate compound reacts with the (c) water, thereby yielding carbon dioxide; the polyurethane resin has a breaking strength of 5 N/cm 2 or greater and less than 200 N/cm 2 in a case in which an elongation percentage thereof is 100% or less; the polyurethane resin has a breaking strength of 5 N/cm 2 to 1,500 N/cm 2 a case in which an elongation percentage thereof is more than 100%; and the expandable coating composition contains elastic solid particles.