Process for increasing the molecular weight of polycondensates
    3.
    发明授权
    Process for increasing the molecular weight of polycondensates 失效
    提高缩聚物分子量的方法

    公开(公告)号:US06706824B1

    公开(公告)日:2004-03-16

    申请号:US09703782

    申请日:2000-11-01

    IPC分类号: C08G6391

    摘要: By heating at above the melting point and/or glass transition point of the polycondensate and adding an aromatic dicyanate; or adding a mixture comprising an aromatic dicyanate and a polyfunctional compound selected from the class of sterically hindered hydroxyphenyl-alkyl-phosphonic esters and monoesters, diphosphonites and secondary aromatic amines; or adding a mixture comprising (i) an aromatic dicyanate, (ii) at least one polyfunctional compound selected from the class of sterically hindered hydroxyphenyl-alkyl-phosphonic esters and monoesters, diphosphonites and secondary amines, and (iii) a difunctional epoxide, it is possible to bring about an increase in the molecular weight and/or viscosity of virgin polycondensate and polycondensate recyclates.

    摘要翻译: 通过在缩聚物的熔点和/或玻璃化转变点以上加热并加入芳香族二氰酸酯; 或添加包含芳族二氰酸酯和选自空间位阻羟基苯基 - 烷基 - 膦酸酯和单酯,二膦酸酯和仲芳族胺类的多官能化合物的混合物; 或添加包含(i)芳族二氰酸酯,(ii)至少一种选自空间位阻羟基苯基 - 烷基 - 膦酸酯和单酯,二亚膦酸酯和仲胺的多官能化合物和(iii)双官能环氧化物的混合物的混合物, 可能导致原始缩聚物和缩聚物回收物的分子量和/或粘度增加。

    Decomposing polymers using NOR-HALS compounds
    7.
    发明授权
    Decomposing polymers using NOR-HALS compounds 有权
    使用NOR-HALS化合物分解聚合物

    公开(公告)号:US6133414A

    公开(公告)日:2000-10-17

    申请号:US202357

    申请日:1998-12-14

    摘要: A method is described for the decomposition of polymers, especially waste plastics and used plastics, in which so-called NOR--HALS compounds--that is, for example, compounds comprising the group ##STR1## in which R* is C.sub.1 -C.sub.20 alkyl, OH-substituted C.sub.1 -C.sub.20 alkyl, optionally C.sub.1 -C.sub.4 alkyl-substituted C.sub.5 -C.sub.12 cycloalkyl or O- or S-interrupted C.sub.2 -C.sub.20 alkyl--are added and heating is carried out at temperatures which lie above the customary processing temperatures for polymers (280.degree. C. or more).

    摘要翻译: PCT No.PCT / EP97 / 03133 Sec。 371 1998年12月14日第 102(e)1998年12月14日PCT PCT 1997年6月17日PCT公布。 出版物WO97 / 49737 日期1997年12月31日描述了用于分解聚合物,特别是废塑料和废塑料的方法,其中所谓的NOR-HALS化合物 - 例如包括其中R *是C 1 -C 20烷基的基团的化合物 ,OH取代的C 1 -C 20烷基,任选地C 1 -C 4烷基取代的C 5 -C 12环烷基或O-或S-间断的C 2 -C 20烷基 - 并且在高于常规加工温度的聚合物的温度下进行加热(280℃ 。 或者更多)。