| 摘要 |
PURPOSE:To obtain the titled composition having excellent adhesivity and especially high corrosion protection to steel plate, etc., by reacting an epoxy resin having a specific structural formula with a compound having adjacent hydroxyl groups, and using the resultant reactive chelate resin having high molecular weight as an active component of the resin composition. CONSTITUTION:(A) An epoxy resin of formula I (R1 is H or CH3; R2 is CH2 or group of formula II; n is 5-30) (e.g. bisphenol A diglycidyl ether) is mixed with (B) a polyhydric phenol carboxlic acid polyhydric alcohol ester having adjacent hydroxyl groups (e.g. glycerol protocatechuic acid triester) and/or a polynucleus polyhydric phenol having adjacent hydroxyl groups (preferably condensate of pyrogallol and formaldehyde, etc.), and the mixture is heated in a solvent preferably at 50-150 deg.C to obtain a reaction product having high molecular weight (preferably >=10,000). The ratio of the component A to the component B is selected preferably to leave the residual phenol group in the reaction mixture. The reaction product is used as an active component of the objective resin composition.
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