Continuous process for the preparation of highly stable, finely divided, low viscosity polymer polyols of small average particle size
    25.
    发明公开
    Continuous process for the preparation of highly stable, finely divided, low viscosity polymer polyols of small average particle size 失效
    用于制备高度稳定的,细碎的,低粘度聚合物多元醇的低粒度durchmittlicher的连续方法

    公开(公告)号:EP0768324A1

    公开(公告)日:1997-04-16

    申请号:EP95115940.9

    申请日:1995-10-10

    申请人: BAYER AG

    摘要: A continuous process for the preparation of highly stable, finely divided, low viscosity polymer polyols of small average particle size wherein in the first step an intermediate is prepared by reacting (1) a mixture of styrene and acrylonitrile in a mixture of (2) a polyoxyalkylene polyether polyol and (3) a macromer in the presence of (4) a free radical initiator, (5) a solvent having moderate chain transfer activity and optionally (6) a reaction moderator at a temperature of at least 100°C, such that the intermediate contains a high level of macromer, at least about 12% and preferably at least about 15% with respect to the polyol mixture and the solids content of the intermediate is less than about 30%, preferably less than about 25% and at least about 15% by weight. The intermediate, which functions as a seed for further polymerization, is then further reacted in one or more stirred-tank reactors in series with a mixture of styrene and acrylonitrile in a polyol and optionally a macromer, in the presence of solvent, initiator and a reaction moderator which are distributed among the remaining reactors.

    摘要翻译: 对于在中间的第一步骤中制备高度稳定的,细碎的,低粘度聚合物平均粒径小worin的多元醇的连续方法是通过在(2)的一个混合物中反应(1)苯乙烯和丙烯腈的混合物制备 聚氧化烯聚醚多元醇,(3)在(4)自由基引发剂的存在的大分子单体,(5),其具有在至少100℃的温度适中链转移活性和任选地(6)反应调节剂的溶剂,检查 做的中间体含有高水平的大单体,至少约12%,优选至少约15%,相对于多元醇混合物和的中间体是小于约30%,优选小于约25%和在固体含量 至少约15%(重量)。 中间,作为用于进一步聚合的种子哪些函数,然后进一步反应在一个或多个搅拌釜反应器串联在多元醇与苯乙烯和丙烯腈的混合物任选的大分子单体在溶剂中,引发剂和存在 反应慢哪些是剩余的反应器中分配。

    DUAL STABILIZED MICROPARTICLES
    27.
    发明公开
    DUAL STABILIZED MICROPARTICLES 失效
    双稳定型微粒。

    公开(公告)号:EP0618934A1

    公开(公告)日:1994-10-12

    申请号:EP93901306.0

    申请日:1992-12-17

    IPC分类号: C08L33 C08F2 C08F290 C09D133 C09D151

    CPC分类号: C08F2/08 C08F290/02

    摘要: On décrit des polymères dispersés comprenant des microparticules stabilisées avec deux sortes de stabilisateurs stériques. Le premier stabilisateur est un polymère essentiellement linéaire pourvu d'une extrémité fixée à la microparticule. Le second stabilisateur est un polymère greffé ou à structure en peigne comportant un squelette acrylique à chaînes latérales. Ce stabilisateur, faisant contraste avec le premier stabilisateur, peut être fixé à la partie centrale à l'aide d'une pluralité de groupes fonctionnels placés le long du squelette du polymère greffé.