Two-stage seed swelling procedure for producing monodisperse PVC particles
    1.
    发明授权
    Two-stage seed swelling procedure for producing monodisperse PVC particles 失效
    用于生产单分散PVC颗粒的两阶段种子溶胀程序

    公开(公告)号:US06228925B1

    公开(公告)日:2001-05-08

    申请号:US09171672

    申请日:1999-02-09

    IPC分类号: C08F1406

    摘要: A procedure for the production of PVC particles with a narrow size distribution in the range 10-50 &mgr;m, preferably 10-30 &mgr;m, in which, in a first stage, a vinyl monomer or a mixture of monomers is polymerised to form a polymer/oligomer seed particle in the range 1-10 &mgr;m. In a second stage, another vinyl monomer or mixture of monomers is swelled into the polymer/oligomer seed particles and polymerisation takes place in such a way that they grow into polymer particles of the desired size. It is preferable to use aromatic vinyl monomers or acrylates as the monomer in the seed particles. The seed particles in the first stage can be produced in a two-stage swelling process or by dispersion polymerisation.

    摘要翻译: 制备具有10-50μm,优选10-30μm的窄尺寸分布的PVC颗粒的方法,其中在第一阶段中乙烯基单体或单体混合物聚合形成聚合物/ 寡聚种子颗粒在1-10毫米范围内。 在第二阶段中,另一种乙烯基单体或单体混合物溶胀到聚合物/低聚物种子颗粒中,聚合以这样的方式进行,使得它们生长成所需尺寸的聚合物颗粒。 优选在种子颗粒中使用芳族乙烯基单体或丙烯酸酯作为单体。 第一阶段中的种子颗粒可以在两阶段溶胀过程中或通过分散聚合制备。