Copolyester resin having minimal carboxyl terminated ends...

Details Copolyester resin having minimal carboxyl terminated ends... Copolyester resin having minimal carboxyl terminated ends...

C - Chemistry, Metallurgy

08

G

402/187

C08G 63/20 (2006.01)

Patent

CA 1145891

COPOLYESTER RESIN HAVING MINIMAL CARBOXYL TERMINATED ENDS AND METHOD FOR PRODUCING THE SAME ABSTRACT OF THE DISCLOSURE A copolyester resin having minimal carboxyl terminated ends, is disclosed, as well as the method for making it. The esterification-condensation reaction is employed reacting a diol, a dicarboxy- lic compound, and a chain branching agent. The chain branching agent is limited in concentration to less than 10 mole percent of the dicarboxylic compound and is charged prior to the condensation stage of the reaction. The copolyester resin so produced achieves minimal carboxyl terminated ends, which when used in coatings, yields a clear resin free of carbon dioxide impurities.

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