Patent ID: 9701806
Date: 2017-07-11
CPC Classifications: C08K,C09D,C23C,H01M,Y02E

Claim:
1. A surface treatment agent for treating a surface of a metal substrate to form a surface-treated film, the surface treatment agent comprising: an acrylic resin having a carboxyl group and a hydroxyl group, an oxazoline group-containing compound and metal particles, wherein the metal particles are particles containing at least one metal selected from the group consisting of Nb, Ca and Nd, wherein an amount of the metal particles is from 0.05 to 2.5% by mass in terms of metal oxide relative to total amount of the surface treatment agent, wherein a mass ratio of the total amount of the content of the acrylic resin having a carboxyl group and a hydroxyl group and the content of the oxazoline group-containing compound to the content of the metal particles in terms of metal oxide [(the total amount of the content of the acrylic resin having a carboxyl group and a hydroxyl group and the content of the oxazoline group-containing compound)/(the content of the metal particles in terms of metal oxide)] is from 0.4 to 7.5, and wherein the surface-treated film contains metal derived from the metal particles in the amount of 20 to 600 mg/m