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Low-melting terephthalate-type polyester for production of melt-spun fibres and injection moulded products such as bottles, contains an alkane-1,2-diol other than ethylene glycol as modifying diol, e.g. butane-1,2-diol
Low-melting terephthalate-type polyester for production of melt-spun fibres and injection moulded products such as bottles, contains an alkane-1,2-diol other than ethylene glycol as modifying diol, e.g. butane-1,2-diol
Polyesters (PES) based on condensation products of terephthalic acid and/or its derivatives (TPA) with dihydric alcohols, in which the alcohols comprise (a) 99.5-40 mol% ethylene glycol (EG), propane-1,3-diol and/or butane-1,4-diol and (b) 0.5-60 mol% alkane-1,2-diol other than EG, and the polyester (PES) has a melting point (DIN EN ISO 53765) of 145-275[deg]C. Independent claims are included for (1) formed products made from PES as above, especially fibres or filaments (2) a method for the production of PES by reacting TPA with (a) and (b) in the above quantities at elevated temperature, preferably at 180-290 [deg]C .
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机译：基于对苯二甲酸和/或其衍生物（TPA）与二元醇的缩合产物的聚酯（PES），其中的醇包括（a）99.5-40 mol％的乙二醇（EG），1,3-丙二醇和/或1,4-丁二醇和（b）除EG以外的0.5-60 mol％烷-1,2-二醇，并且聚酯（PES）的熔点（DIN EN ISO 53765）为145-275 [ ℃。对于（1）由上述PES制成的成型产品，特别是纤维或长丝，（2）通过使TPA与上述数量的（a）和（b）在高温下反应生产PES的方法，包括独立权利要求，优选在180-290℃。
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