Initiation system comprising a silylated initiator for anionic (co)polymerization of (meth)acrylic monomer(s) and process using same
    16.
    发明授权
    Initiation system comprising a silylated initiator for anionic (co)polymerization of (meth)acrylic monomer(s) and process using same 失效
    包括用于(甲基)丙烯酸单体的阴离子(共)聚合的甲硅烷基化引发剂的起始体系和使用它们的方法

    公开(公告)号:US06319875B1

    公开(公告)日:2001-11-20

    申请号:US09058481

    申请日:1998-04-10

    IPC分类号: B01J3112

    摘要: The initiation system comprises (1) at least one silylated initiator and (2) at least one alkaline metal alcoholate as ligand. The silylated initiator may be monofunctional and selected in particular from among the compounds of Formula (I) or difunctional and selected in particular from among the compounds of Formula (II): wherein R1, R2, R3 each independently represent a C1-C8alkyl radical, linear or branched; R4 is a linear or branched C1-C8alkylene radical; M is an alkaline metal or alkaline earth metal (valence q of 1 or 2); R5 and R6 each independently represent an alkyl radical, linear or branched, at C1-C8; R7, R8 each independently represent a C1-C8alkylene radical, linear or branched; M′ is an alkaline metal. Application is to the preparation of (meth)acrylic (co)polymers.

    摘要翻译: 引发体系包括(1)至少一种甲硅烷基化引发剂和(2)至少一种碱金属醇化物作为配体。 甲硅烷基化的引发剂可以是单官能的,特别是选自式(I)的化合物或二官能的,特别是选自式(II)的化合物:其中R 1,R 2,R 3各自独立地表示C 1 -C 8烷基, 直链或支链; R4是直链或支链C1-C8亚烷基; M是碱金属或碱土金属(价数q为1或2); R 5和R 6各自独立地表示在C 1 -C 8的直链或支链的烷基; R 7,R 8各自独立地表示直链或支链的C 1 -C 8亚烷基; M'是碱金属。 适用于(甲基)丙烯酸(共)聚合物的制备。

    Core bit having axial conical core breaker
    19.
    发明授权
    Core bit having axial conical core breaker 失效
    芯轴具有轴向圆锥形断路器

    公开(公告)号:US4207954A

    公开(公告)日:1980-06-17

    申请号:US892357

    申请日:1978-03-31

    申请人: Robert Jerome

    发明人: Robert Jerome

    CPC分类号: E21B10/04 E21B10/26 E21B10/46

    摘要: A drilling tool comprising a body having a leading face with a central recess providing the body with an annular leading cutting edge such that during drilling a central core is formed, and a central cone positioned axially in the recess for breaking up the core.

    摘要翻译: 一种钻具,其包括主体,所述主体具有前表面,所述主体具有中心凹槽,所述中心凹槽为所述主体提供环形的前切割刃,使得在钻孔期间形成中心芯,以及中心锥体,其轴向位于所述凹部中以分解所述芯。