Copolyester resin having minimal carboxyl terminated ends and me

Details Copolyester resin having minimal carboxyl terminated ends and me Copolyester resin having minimal carboxyl terminated ends and me

1980-03-12

1981-04-28

Phynes, Lucille M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

528296, 528302, 528309, C08G 6376, C08F28300

Patent

active

042647517

ABSTRACT:
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 dicarboxylic 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.

REFERENCES:
patent: 2895946 (1959-07-01), Huffman
patent: 3505294 (1970-04-01), Ishii et al.
patent: 4013624 (1977-03-01), Hoeschele
patent: 4124570 (1978-11-01), Scheibelhoffer et al.

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