BASIC ZINC CARBOXYLATES
    92.
    发明公开
    BASIC ZINC CARBOXYLATES 失效
    基本锌

    公开(公告)号:EP0804404A1

    公开(公告)日:1997-11-05

    申请号:EP95923295.0

    申请日:1995-06-08

    IPC分类号: C07C53

    CPC分类号: C07C53/126 C07C53/128

    摘要: Superbase zinc soaps in the form of zinc carboxylates, in which the carboxylic acids consisting of a mixture or otherwise of satured organic carboxylic acids containing from 7 to 13 carbon atoms, having the following characteristics: a linear acid content of between 0 and 40 % by weight, a content of acids which are branched on carbon 2 of between 0 and 20 % by weight, and a content of acids which are mono- or polysubstituted on carbon 3 and/or on the carbons of higher rank, which is equal to or greater than 50 % by weight; their preparation and use as polymer stabilisers particularly for polyvinyl chloride.

    MICRO PARTICLES
    94.
    发明授权
    MICRO PARTICLES 失效
    微粒

    公开(公告)号:EP0659168B1

    公开(公告)日:1997-10-08

    申请号:EP93919780.2

    申请日:1993-09-01

    IPC分类号: C01B33/26 C01B39/00

    摘要: The present invention relates to colloidal suspensions of discrete particles of colloidal zeolite and a method for preparing such zeolite from clear tetraalkylammonium stabilized aluminiumsilicate solutions. Smaller amounts of well defined and controlled metal hydroxide solutions are added to these alumiumsilicate solutions to enable the synthesis of a specific zeolite as well as to control zeolite yield. The colloidal suspensions are characterized by an average particle size of less than 250 nanometers and preferably, less than 200 nanometers together with the fact that the particle size distribution expressed as the geometric standard deviation is less than 1.30 and preferably less than 1.20. Zeolite sols synthesized according to this invention display Tyndall light scattering typical for colloidal suspensions as well as a very low rate of sedimentation due to the small particle size. Zeolite sols synthesized according to this invention can be prepared so as to contain negligable amounts of amorphous material.

    CATALYST FOR POLYMERIZING OLEFINS
    96.
    发明公开
    CATALYST FOR POLYMERIZING OLEFINS 失效
    催化剂用于聚合烯烃

    公开(公告)号:EP0797596A1

    公开(公告)日:1997-10-01

    申请号:EP95904845.0

    申请日:1994-12-08

    IPC分类号: C08F4 C08F10

    摘要: The disclosure concerns Ziegler-Natta catalysts. Specifically, magnesium and titanium containing catalysts are disclosed that do not exhibit a well known effect, the 'comonomer effect'. This effect manifests itself in decreasing activity with decreasing amounts of comonomer in a 1-olefin polymerization. Through the use of magnesium chloride, the effect is shown to be substantially reduced. Further, even where there are comonomers present, the catalysts of this invention show improved catalyst activity in the presence of magnesium chloride.

    摘要翻译: 该公开涉及齐格勒 - 纳塔催化剂。 具体而言,公开了不具有众所周知的效果即“共聚单体效应”的含镁和钛的催化剂。 这种效应表现为随着1-烯烃聚合中共聚单体的量的减少而降低活性。 通过使用氯化镁,其效果显示显着降低。 此外,即使在存在共聚单体的情况下,本发明的催化剂在氯化镁存在下也显示出改善的催化剂活性。