PURPOSE: To obtain a filmy adhesive excellent in stability with time, adhesion to metals and resistance to solvents having strong electron donative properties by using a specific polyamide resin, an epoxy resin and a novolak type phenol resin together as adhesive components.
CONSTITUTION: This adhesive is obtained by dissolving (A) an alkali-soluble polyamide resin (preferably a nylon 12-based alcohol-soluble type polyamide resin having ≤-10°C Tg), (B) an epoxy resin and (C) a novolak type phenol resin in an organic solvent (preferably an alcoholic organic solvent) and drying the resultant solution into a filmy state or impregnating nonwoven fabric with the solution and drying the nonwoven fabric impregnated therewith. Furthermore, the respective components are preferably used in amounts so as to provide 40-90wt.% component (A), 5-30wt.% component (B) and 5-40wt.% component (C) based on 100 wt.% total amount of the components (A) to (C). A sulfonium salt-based latent curing agent in an amount of ≤5wt.% based on 100 wt.% total amount of the components (A) to (C) is preferably blended as an epoxy resin curing agent.
HASHIMOTO SHINICHI
TAKAHASHI KAZUHIKO
