BRANCHED POLYESTER FOR POWDER COATINGS

The present invention relates to a carboxylic acid functional branched polyester, having an acid number of at least 77 mg KOH/g, said carboxylic acid functional branched polyester being the reaction product of a polybasic organic carboxylic acid or its anhydride, preferably trimellitic anhydride, and a branched hydroxyl functional polyester obtained from 70 to 100 mole % of terephthalic acid and/or isophthalic acid and, optionally, from 0 to 30 mole % of another polycarboxylic acid, referring to the polyacid constituents, from 10 to 50 mole % of ethylene glycol, from 50 to 87.5 mole % of at least one other aliphatic or cycloaliphatic diol and from 1.5 to 15 mole % of at least one polyol, referring to the polyol constituents, as well as to the use of this polyester to prepare powder coating compositions which present a low gloss, especially of below 35% (at 60°), when used in combination with standard powder coating polyesters and crosslinkers.