Any of these may be used alone or in combination.As the hydroxyl-group-containing resin having a molecular weight of 10,000 or more, polymers such as polyvinyl butyral, polyvinyl formal, polyamide, polyester, phenol resin, epoxy resin and phenoxy resin may be used, which exhibit superior stressrelaxation properties at the time of curing and bring about an improvement in adhesion attributable to hy