Process of manufacturing cross-linked molded articles
    2.
    发明授权
    Process of manufacturing cross-linked molded articles 失效
    制造交联模制品的过程

    公开(公告)号:US3660552A

    公开(公告)日:1972-05-02

    申请号:US3660552D

    申请日:1970-03-19

    IPC分类号: B29C45/00 C08J3/20 B29F1/08

    摘要: IMPROVED PROCESS OF FORMING CROSS-LINKED THERMOPLASTIC POLYMER MOLDED ARTICLES BY MIXING THE THERMOPLASTIC AND A SUITABLE FREE RADICAL INITATING CROSS-LINKING AGENT, BOTH IN SOLID FORM, AT A TEMPERATURE BELOW THE ACTUATION TEMPERATURE OF THE FREE RADICAL GENERATOR AND BELOW THE HEAT PLASTICIZATION TEMPERATURE OF THE THEROPLASTIC POLYMER; INJECTING SUCH MIXTURE THROUGH A NOZZLE INTO A PREHEATED MOLD UNDER SUCH CONDITIONS AS TO HEAT THE MOLDING MATERIAL MIXTURE PASSING THROUGH THE NOZZLE TO A TEM-

    PERATURE WHICH IS ABOVE THE ACTIVATION TEMPERATURE OF THE FREE RADICAL GENERATOR AND ABOVE THE MELTING POINT OF THE THERMOPLASTIC POLYMER; AND HOLDING THE MOLDING MATERIAL MIXTURE IN THE MOLD AT A TEMPERATURE AND FOR A TIME SUFFICIENT TO AT LEAST INTIATE CROSS-LINKING AND FORMATION OF SAID MOLDED ARTICLE.