Method for the manufacture of poly(aliphatic ester-carbonate)s and uses thereof

    公开(公告)号:US10746676B2

    公开(公告)日:2020-08-18

    申请号:US16318637

    申请日:2016-12-19

    Abstract: An interfacial process for preparing a poly(aliphatic ester-carbonate) includes providing an initial polymerization reaction mixture comprising an aliphatic C6-20 dicarboxylic acid, a bisphenol, an alkali hydroxide, and optionally a catalyst in a solvent system comprising water and an immiscible organic solvent, adding an initial portion of a carbonyl dihalide over a first time period while maintaining the reaction at a first pH from 7 to 8; and adding a second portion of the carbonyl dihalide over a second, subsequent time period while maintaining the reaction pH at a second pH from 9 to 12, to provide a product polymerization mixture, wherein the amount of alkali hydroxide in the initial polymerization reaction mixture is effective to increase the fraction of the first time period at a measured pH of 7 to 8 compared to the same reaction mixture with a higher amount of alkali hydroxide in the initial polymerization mixture.

    Purification of monomer from recycle polyesters
    4.
    发明授权
    Purification of monomer from recycle polyesters 有权
    从再循环聚酯中纯化单体

    公开(公告)号:US09127136B1

    公开(公告)日:2015-09-08

    申请号:US14335197

    申请日:2014-07-18

    Abstract: A method of recycling bis(hydroxyalkyl) terephthalate monomer from a composition comprising a terephthalate-containing polymer includes depolymerizing the terephthalate-containing polymer to provide the bis(hydroxyalkyl) terephthalate; and separating the bis(hydroxyalkyl) terephthalate from the composition comprising the depolymerized terephthalate-containing polymer by continuous multi-column liquid chromatography.

    Abstract translation: 从包含对苯二甲酸酯的聚合物的组合物中回收双(羟烷基)对苯二甲酸酯单体的方法包括使含对苯二甲酸酯的聚合物解聚以提供对苯二甲酸双(羟烷基)酯; 并通过连续多柱液相色谱从包含解聚对苯二甲酸酯的聚合物的组合物中分离双(羟烷基)对苯二甲酸酯。

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