PRODUCTION OF POLYESTER RESIN FOR COATING MATERIAL AND COATING MATERIAL

摘要

PURPOSE:To obtain a polyester for a thermosetting coating material excellent in pigment dispersion and the balance among processability, film hardness and staining resistance by mixing a specified polyester resin with a specified long- chain alpha-olefin glycol in a specified mixing ratio and polycondensing the mixture in a vacuum. CONSTITUTION:99.5wt.% polyester resin synthesized from an acid component comprising 100-40mol% aromatic dicarboxylic acid component and 0-60mol% aliphatic dicarboxylic acid component and an alcohol component comprising 100-95mol% dihydric alcohol component and 0-5mol% at least trihydric alcohol component is mixed with 0.5-5wt.% long-chain alpha-olefin glycol of the formula (wherein n is an integer of 5 or greater), and the obtained mixture is polycondensed in a vacuum.