专利名称：Poly (ethylene/alkylene) terephthalates
which crystallize rapidly
发明人：Peter Bier,Rudolf Binsack,Hugo Vernaleken申请号：US05/889584申请日：19780323公开号：US04176224A公开日：19791127
摘要：The present invention is concerned with thermoplastic terephthalic acidcopolyesters which crystallize more rapidly than homopolyethylene terephthalate andare based on a diol component which is about 98 to 99.9 mol % of ethylene glycol andthe balance 2-ethylhexane-1, 3-diol. The acid component may be up to about 10.0 mol %of other than terephthalic acid or its dimethyl ester.
This invention is also concerned with a process of synthesizing such copolyesters byesterifying or transesterifying the acid and diol components between about 150° and250° C. in the presence of appropriate catalysts. The condensation product may besubject to polycondensation at about 200. degree. to 300° C. under reduced pressure inthe presence of esterification catalysts. In a preferred embodiment the 2-ethylhexane-1,3- diol is added after the initial reaction between the acid component and the ethyleneglycol and preferably after the degree of polycondensation is greater than 4.
申请人：BAYER AG
代理人：Gene Harsh,Lawrence S. Pope
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