Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
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.
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Bier Peter
Binsack Rudolf
Bayer Aktiengesellschaft
Harsh Gene
Pope Lawrence S.
Seccuro Carman J.
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