Patent ID: 9473459
Filing Date: 2016-10-18
CPC Classification: B29C,B29L,B32B,C08J,C09J,G06F,H04L,H04M,H04W,Y10T

Claim Text:
1. A peel ply system for surface preparation of various composite substrates, said system comprising: (a) a composite substrate comprising reinforcing fibers impregnated with a cured, first resin matrix; and (b) a removable, resin-rich peel ply adhered to a surface of the composite substrate, said peel ply comprising a woven fabric impregnated with a cured, second resin matrix different from the first resin matrix, whereby, upon manual removal of the peel ply from the composite substrate's surface, a thin film of the second resin matrix remains on the composite substrate's surface to provide a bondable surface capable of co-bonding and secondary bonding with another composite substrate, wherein said second resin matrix is formed from a resin composition comprising: at least one epoxidized novolac resin having epoxy functionality of at least 2; di-functional epoxy resin selected from diglycidyl ethers of polyhydric phenols; tri-functional epoxy resin selected from triglycidyl ethers of aminophenols; a curing agent; and inorganic filler particles; wherein said peel ply has a resin content of at least 20% by weight based on the total weight of the peel ply, and wherein said woven fabric comprises a plurality of yarns woven in a weaving pattern, said yarns having warp tensile strength of ≧70 lbf/in, fill tensile strength of ≧40 lbf/in, warp linear mass density within the range of 50-250 deniers, and fill linear mass density within the range of 50-250 deniers.