| 摘要 |
PURPOSE:To product the titled resin which itself has a film-forming property and is excellent in oil resistance, heavy oil resistance and gasoline resistance, by heating a specified epoxidized cyclized diene resin in the presence of a carboxyl group-containing organic acid. CONSTITUTION:A diene resin (e.g., polyisoprene polymer of an average MW of 5,000-150,000 and a cis-1,4-bond content >=70% is heated in the presence of a Friedel-Crafts catalyst in an aromatic hydrocarbon solvent until the degree of cyclization reaches 10-70%. To the obtained cyclized diene resin, 0.02-2.0mol, per double bond of the resin, of aqueous H2O2 of a concentration >=30wt% is added, and the resin is epoxidized at 50-90 deg.C in the presence of a lower carboxylic acid in an inert solvent or a chlorinate or aromatic hydrocarbon solvent to obtain an epoxidized cyclized diene resin of an oxirane oxygen content >=0.5%. This resin is heated at 70-150 deg.C for 2-12hr in the presence of an organic acid having at least one carboxyl group (e.g., benzoic acid).
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