| 摘要 |
PCT No. PCT/EP87/00445 Sec. 371 Date Feb. 14, 1989 Sec. 102(e) Date Feb. 14, 1989 PCT Filed Aug. 13, 1987 PCT Pub. No. WO88/01287 PCT Pub. Date Feb. 25, 1988.The invention relates to an aqueous coating agent, obtained from an epoxy resin, ethylenically unsaturated monomers, some of which contain carboxyl groups, a peroxide initiator in a proportion of at least 2% by weight, relative to the total weight of the monomers, a crosslinking agent, a neutralizing agent, organic solvents, and, if appropriate, further conventional additives, such as plasticizers, stabilizers, wetting agents, dispersion auxiliaries, catalysts and pigments. The coating agent is based on a binder (a) which is obtainable from (A) 20 to 80% by weight of an epoxy resin having an average of more than one epoxy group per molecule and having an average molecular weight of at least 500, (B) 1 to 60% by weight of polyester polycarboxylic acids having an average molecular weight of 500 to 5,000 and having an acid number of 30 to 150, and (C) 10 to 50% by weight of ethylenically unsaturated monomers, 10 to 50% by weight of the monomers containing carboxyl groups, where the sum of (A), (B) and (C) is 100% by weight, the binder (a) has an acid number of 20 to 150, and the crosslinking agents (b) used are phenolic and/or amino resins, with the proviso that the coating agent contains (a) 30 to 70% by weight of the binder (a), (b) 2 to 30% by weight, preferably 5 to 16% by weight, of the crosslinking agent (b), (c) 1 to 7% by weight, preferably 2 to 5% by weight, of ammonia and/or amine as neutralizing agent, and (d) 20 to 60% by weight of organic solvents, where the sum of (a), (b), (c) and (d) is 100% by weight. The present invention also relates to a process for the preparation of the coating agents, and the use thereof for coating of cans. |
