Patent ID: 8075706

Claim:
A paste composition for aluminum brazing comprising 40 to 65% by weight of a metal powder for brazing (a), 5 to35% by weight of a fluoride type flux (b), 1 to 10% by weight of a methacrylic acid ester type polymer (c), and 10 to 40% by weight of an organic solvent (d), wherein the organic solvent (d) is a naphthene type alicyclic hydrocarbon having no aromatic ring and no hydroxyl group, where the naphthene type alicyclic hydrocarbon type organic solvent has a boiling point of 150° C. or higher, the methacrylic acid ester type polymer(c) is a polymer selected from the group consisting of homopolymers of C 1 to C 18 alkyl esters of methacrylic acid and copolymers of C 1 to C 18 alkyl esters of methacrylic acid and hydroxyl group-containing methacrylic acid esters, where the hydroxyl group-containing methacrylic acid esters have neither a carboxyl group nor a sulfonic acid group, and the composition is a paste-like state having a viscosity of 6,000 to 200,000mPa · at 23° C.