METHOD OF PRODUCING POLYESTER BINDER FOR PAINT MATERIALS Russian patent published in 2015 - IPC C08G63/20 C08G63/181 

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of producing polyester binder for paint materials. Described is a method of producing polyester binder for paint materials, which includes polyesterification of polyatomic alcohols with cycloaliphatic anhydrides and phthalic anhydride, wherein the method comprises, before polyesterification, melting without mixing to temperature of 90-130°C polyatomic alcohols selected from 1,6-hexanediol and/or neopentyl glycol and/or trimethylol propane and/or butylethyl propanediol; loading the phthalic anhydride and cycloaliphatic anhydrides, selected from hexahydrophthalic anhydride and/or tetrahydrophthalic anhydride and/or 3- or 4-methyltetrahydrophthalic anhydride and or isomethyltetrahydrophthalic anhydride and/or endomethylene tetrahydrophthalic anhydride and further adding isophthalic acid; heating the reaction mass to 220-260°C and holding until achieving acid number of the base of 3-15 mg KOH/g; cooling the mass to 120-160°C and loading adipic acid; heating the mass to 220-250°C and holding until dynamic viscosity of 65% of the solution of the base reaches 1500-5000 mPa·s.

EFFECT: obtaining light polyester binder with high weight ratio of nonvolatile substances, with higher hardness, which dries at a lower temperature.

2 cl, 1 tbl, 5 ex