Method for suspension polymerization of vinyl chloride
    1.
    发明授权
    Method for suspension polymerization of vinyl chloride 失效
    氯乙烯悬浮聚合方法

    公开(公告)号:US3757001A

    公开(公告)日:1973-09-04

    申请号:US3757001D

    申请日:1971-04-16

    申请人: ALLIED CHEM

    发明人: REITER W REVENTAS A

    CPC分类号: C08F114/06 C08F255/023

    摘要: IN SUSPENSION POLYMERIZATION OF VINYL CHLORIDE IN AQUEOUS MEDIA IN CLOSED POLYMERIZATION VESSELS IN THE PRESENCE OF CONVENTIONAL SUSPENDING AGENTS AND OIL-SOLUBLE POLYMERIZATION INITIATORS, ADHESION OF POLYMER TO THE INNER WALL OF THE POLYMERIZATION VESSEL IS ELIMINATED OR SUBSTANTIALLY REDUCED BY (1) CONDUCTING THE POLYMERIZATION IN AN ACIDIC AQUEOUS MEDIUM, IN CONJUCTION WITH (2) PRESENCE DURING THE POLYMERIZATION IN THE POLYMERIZATION MASS OF OXIDIZED POLYETHYLENE HAVING A MINIMUM NUMBER AVERAGE MOLECULAR WEIGHT OF ABOUT 1000, CONTAINING BETWEEN ABOUT 1 AND 5% BY WEIGHT OF OXYGEN, AND HAVING AN ACID NUMBER OF FROM 9 TO ABOUT 35.

    Odor improvement of xanthogen-modified chloroprene polymers
    9.
    发明授权
    Odor improvement of xanthogen-modified chloroprene polymers 失效
    改性氯化聚乙烯的改性

    公开(公告)号:US3775388A

    公开(公告)日:1973-11-27

    申请号:US3775388D

    申请日:1972-02-18

    申请人: DU PONT

    发明人: KHAN A

    CPC分类号: C08F36/16

    摘要: POLYMERIZING CHLOROPRENE IN AN ALKALINE AQUEOUS EMULSION IN THE PRESENCE OF A DIALKYL XANTHOGEN DISULFIDE CHAIN TRANSFER AGENT TO FORM A CHLORPRENE POLYMER LATEX AND ADDING TO THE POLYMER LATEX AT A TIME WHEN THE DESIRED DEGREE OF POLYMERIZATION HAS BEEN REACHED A COMPOUND HAVING THE STRUCTURE

    R-S-N(-R1)-R2

    WHEREIN R IS HYDROCARBYL, 2-THIAZOLYL, 2-BENZOTHIAZOYL RADICALS OR

    -S-N(-R3)-R4

    R1, R2, R3, AND R4 ARE ALKYL, CYCLOALKYL, OR ARALKYL AND R1 AND R2 OR R3 AND R4 TOGETHER CAN FORM A SATURATED RING WITH THE NITROGEN.

    Preparation of perfluoroalkyl iodides
    10.
    发明授权
    Preparation of perfluoroalkyl iodides 失效
    全氟烷基碘的制备

    公开(公告)号:US3679757A

    公开(公告)日:1972-07-25

    申请号:US3679757D

    申请日:1969-11-24

    申请人: ICI LTD

    发明人: TITTLE BARRY

    IPC分类号: C07C17/093 C08F3/32 C07C19/08

    CPC分类号: C07C17/093 C07C19/16

    摘要: Perfluoroalkyl iodides C2F5(C2F4)nI, where n is zero or an integer equal at least to one, are made by heating perhaloalkyl arsines with iodine or with iodine and tetrafluoroethylene at temperatures from 40* - 280* C and pressures from atmospheric up to about 30 atmospheres. The preferred reaction is that between monofluorobis (pentafluoroethyl)arsine, iodine and tetrafluoroethylene at 50* - 280* C and under pressures from 5 to 30 atmospheres.

    摘要翻译: 全氟烷基碘化物C2F5(C2F4)nI,其中n为零或整数等于至少一个,通过用碘或碘和四氟乙烯在40-280℃的温度下加热全卤代烷基胂和从大气压至约 30个大气压。 优选的反应是在50-280℃和5至30个大气压的压力下,单氟代(五氟乙基)胂,碘和四氟乙烯之间的反应。