Block copolyesters which crystallize rapidly

Details Block copolyesters which crystallize rapidly Block copolyesters which crystallize rapidly

1978-02-03

1980-06-10

Seccuro, Carman J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 22CR, 260 22CB, 260 4218, 260 457P, 260 4575B, 260 4575C, 260 459R, 260 459P, 525173, 525176, 525177, 525408, 525437, C08L 6702, C08L 7102

Patent

active

042072301

ABSTRACT:
The current invention is concerned with block copolyesters of low glass transition temperature segments and ethylene glycol based polyester segments linked together by carboxylic acid ester groups and special diols, and a process for preparing these copolyesters. These copolyesters display molded resin properties similar to polyethylene terephthalate but crystallization behavior similar to polybutylene terephthalate, i.e. they have high strength and superior solvent resistance, but they also crystallize rapidly. They are made by subjecting low glass transition temperature (less than 0.degree. C.) polymers with carboxyl, hydroxyl or reactive ester end groups to esterification or transesterification conditions with ethylene glycol based polyester segments having a minimum intrinsic viscosity of 0.2 dl/g and special diols having four to ten carbon atoms with 3 or 4 carbon atoms between the hydroxyl groups in the presence of appropriate catalysts. In a preferred embodiment, the three components are subject to melt homogenization in an extruder and the solidified extrudate is subject to a solid state polycondensation reaction.

REFERENCES:
patent: 2744087 (1956-05-01), Snyder
patent: 3692744 (1972-09-01), Rich et al.
patent: 3719729 (1973-03-01), Le Paranthoen et al.
patent: 3843752 (1976-10-01), Katayama et al.
patent: 3849515 (1974-11-01), Mueller
patent: 4069278 (1978-01-01), Borman
patent: 4086212 (1978-04-01), Bier et al.
patent: 4107149 (1978-08-01), Bier et al.

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