Patent ID: 9636867
Date: 2017-05-02
CPC Classifications: B29C,B29L,B32B,C08J,C09J,Y10T

Claim:
1. A method for surface preparation prior to adhesive bonding comprising: (a) providing a composite substrate comprising reinforcing fibers impregnated with a curable, first matrix resin; (b) applying a removable, resin-rich peel ply onto a surface of the composite substrate, said peel ply comprising a woven fabric impregnated with a curable, second matrix resin different from the first matrix resin; (c) co-curing the composite substrate and the peel ply until the composite substrate is fully cured but the second matrix resin in the peel ply remains partially cured; and (d) removing the peel ply from the composite substrate's surface, leaving a thin film of partially cured second matrix resin on the composite substrate's surface, said thin film providing a roughened, bondable surface with chemically-active functional groups.