| 摘要 |
PURPOSE:To obtain a cationic electrodeposition coating resin for the under coating of automobile, storable without causing viscosity increase and gelation and having high stability and excellent coating film property, by reacting an epoxy resin with a compound containing active hydrogen to eliminate the epoxy group and reacting the product with epsilon-caprolactone. CONSTITUTION:(A) An resin [e.g. 2,2-bis(4-hydroxyphenyl)propane] is compounded with (B) a compound containing active hydrogen atom. The resultant reaction product is made to react with (C) 5-35 wt% epsilon-caprolactone and preferably (D) 1-10,000 ppm of a metal compound (e.g. tin octanoate) to obtain the objective resin for cationic electrodeposition coating.
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