Aqueous copolyester dispersions suited for the subbing of...

Details Aqueous copolyester dispersions suited for the subbing of... Aqueous copolyester dispersions suited for the subbing of...

B - Operations, Transporting

32

B

96/105, 117/197

B32B 27/36 (2006.01) C08G 63/688 (2006.01) C08J 7/04 (2006.01) G03C 1/93 (2006.01)

Patent

CA 1205699

Abstract An aqueous copolyester dispersion suitable for the subbing of polyester film without use of organic solvents wherein the copolyester contains recurring ester groups derived from ethylene glycol and an acid mixture containing terephthalic acid, isophthalic acid and sulphoisophthalic acid whose sulpho group is in salt form herein the said acid mixture essentially consists of from 20 to 60 mole % of isophthalic acid from 6 to 10 mole % of said sulphoisophthalic acid from 0.05 to 1 mole % of an aromatic polycarboxylic acid compound which has at least three carboxylic acid groups, said polycarboxylic acid being not capable of forming intramolecularly an anhydride and including at least two carboxylated aromatic nuclei, and the remainder in said acid mixture being terephthalic acid ; the copolyester has a glass transition temperature of at least 50°C and an intrinsic viscosity of from 0.15 to 0.45 dl/g when measured at 25°C in a mixture of phenol/o-dichlorobenzene (60/40 by volume).

414601

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