DEPOLYMERIZATION PROCESS FOR RECYCLING POLYESTERS
    4.
    发明授权
    DEPOLYMERIZATION PROCESS FOR RECYCLING POLYESTERS 有权
    解聚已回收聚酯

    公开(公告)号:EP1023369B1

    公开(公告)日:2002-01-16

    申请号:EP98953536.4

    申请日:1998-10-15

    IPC分类号: C08J11/24 C07C67/08

    摘要: A process for recovering suitable polyester feedstock material from recycled polyester includes the steps of depolymerizing the polyester into its component ester monomers and half-esters; separating the monomers and half-esters from other secondary materials; and mixing the component ester monomers and half-esters with additional monomers to produce a low molecular weight polyester. In a preferred embodiment of the invention the recycled polyester is contacted with a component monomer or oligomer thereof to liquefy the polyester before the polyester is depolymerized. The invention further provides an apparatus for carrying out the process. The apparatus includes a first reactor for depolymerizing the recycled polyester, a separator for separating ester monomeric components and half-esters from secondary materials produced in the first reactor, and a second reactor for producing a low molecular weight polyester from the liquefied separator products.

    PROCESS FOR THE PREPARATION OF COPOLYESTERS BASED ON 2,2,4,4-TETRAMETHYL-1,3-CYCLOBUTANEDIOL AND 1,4-CYCLOHEXANDIMETHANOL
    6.
    发明公开
    PROCESS FOR THE PREPARATION OF COPOLYESTERS BASED ON 2,2,4,4-TETRAMETHYL-1,3-CYCLOBUTANEDIOL AND 1,4-CYCLOHEXANDIMETHANOL 有权
    用于生产ON 2,2,4,4-四甲基-1,3-环丁二醇和1,4-环己烷二甲醇的共聚酯基于

    公开(公告)号:EP2152777A1

    公开(公告)日:2010-02-17

    申请号:EP08767590.6

    申请日:2008-05-06

    IPC分类号: C08G63/78

    摘要: Disclosed is a process for the preparation of high molecular weight, thermoplastic copolyesters by reacting a diester composition comprising a dialkyl ester of terephthalic acid with a diol composition comprising a first diol component comprising 2,2,4,4-tetramethyl-l,3-cyclobutanediol and a second diol component comprising 1,4-cyclohexanedimethanol. The diester composition can be reacted with the first diol component to produce a polyester oligomer that can be reacted further with the second diol component to produce a modified polyester oligomer. The modified polyester oligomer can then be heated to form a copolyester. The process reduces the precipitation of polyd,4- cyclohexylene dimethylene) terephthalate in the reaction mixture.