Silane-functionized acrylic primer composition

A primer composition characterized by comprising:

• (A) 100 parts by weight of a reactive acrylic resin comprising a main chain composed of a copolymer of a methacrylate with an alkyl group having 1 or 2 carbon atoms and a methacrylate with an alkyl group having 4 to 10 carbon atoms in a weight ratio of 9:1 to 3:7 and a side chain having a group with a hydroxyl group and at least one aromatic ring at a ratio of 0.1 to 30% based on the degree of polymerization of the main chain;
• (B) 100 to 500 parts by weight of a silane compound obtained by reaction of 2 to 3 moles in total of dialkoxyepoxysilane and trialkoxyepoxysilane per mole of an aminosilane having two amino groups, with the molar ratio of the above-mentioned dialkoxyepoxysilane to the trialkoxyepoxysilane being 3:7 to 9:1;
• (C) 10 to 300 parts by weight of an epoxy resin of bisphenol A type having an epoxy equivalent of 1,000 to 2,000 g/eq.;
• and
• (D) 100 to 500 parts by weight of carbon black.