Primer composition and method of bonding therewith

Abstract

The invention provides a primer composition excellent in adhesion to porous substrates and a method of bonding. Disclosed is a primer composition comprising: (A) a vinyl copolymer obtained by copolymerizing a monomer component comprising (a) 5 to 80 wt % of a monomer having a silicon-containing group which bears a hydroxyl or hydrolyzable group bonded to the silicon atom and causes crosslinking via the formation of a siloxane linkage and (b) 20 to 95 wt % of an alkyl (meth)acrylate monomer wherein the alkyl has 1 to 8 carbon atoms; and (B) a vinyl copolymer obtained by copolymerizing a monomer component comprising (a) 5 to 80 wt % of a monomer having a silicon-containing group which bears a hydroxyl or hydrolyzable group bonded to the silicon atom and causes crosslinking via the formation of a siloxane linkage and (c) 20 to 95 wt % of an alkyl (meth)acrylate monomer wherein the alkyl has 10 or more carbon atoms, as well as a method of bonding a sealant to a substrate, characterized by applying the primer composition onto a substrate and then allowing a sealant to adhere to the resulting coated surface of the substrate.

Dependencies are inferred from the claim text.