Polytrimethylene terephthalate which has a low content of a cyclic dimer and hardly produces the cyclic dimer when it is melt molded and a fiber made from the polytrimethylene terephthalate.
Polytrimethylene terephthalate (A) is essentially composed of a trimethylene terephthalate unit, has an intrinsic viscosity of 0.5 to 1.6 dl/g and contains 0.01 to 0.5 wt% of a compound represented by the following formula (I) or (II):
(R1, R2 and R3 are the same or different hydrocarbon groups having 1 to 10 carbon atoms, n is an integer of 1 to 5, M is an alkali metal atom or alkali earth metal atom, and m is 1 when M is an alkali metal atom and 2 when M is an alkali earth metal atom),
(R4 and R5 are the same or different and each a hydrogen atom or hydrocarbon group having 1 to 10 carbon atoms).
Continuous bioreactor process for the preparation of polyester cyclic oligomers
申请人:Brugel G. Edward
公开号:US20050054809A1
公开(公告)日:2005-03-10
A continuous process for the process for the enzyme-catalyzed preparation of cyclic ester oligomers from linear ester oligomers. The process may use a linear or recirculating reactor.
酶催化从线性酯低聚物制备环状酯低聚物的连续工艺。该工艺可使用线性或循环反应器。
EP1618138A2
申请人:——
公开号:EP1618138A2
公开(公告)日:2006-01-25
POLY(TRIMETHYLENE TEREPHTHALATE) MOLDING RESINS AND MOLDED ARTICLES THEREFROM
申请人:E. I. du Pont de Nemours and Company
公开号:EP2403906B1
公开(公告)日:2017-11-01
Enzyme-catalyzed process for the preparation of macrocyclic polyester oligomers
申请人:DiCosimo Robert
公开号:US20070021584A1
公开(公告)日:2007-01-25
A process for the enzyme-catalyzed preparation of cyclic ester oligomers from dicarboxylic acids and/or dicarboxylic acid derivatives and diols, hydroxycarboxylic acids and/or hydroxycarboxylic acid esters, and/or linear ester oligomers in the presence of a solvent comprising a tertiary alcohol and a non-alcoholic solvent.