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    2.
    发明专利
    未知

    公开(公告)号：DE2703280A1

    公开(公告)日：1978-08-10

    申请号：DE2703280

    申请日：1977-01-27

    Applicant: HOECHST AG

    Inventor： FISCHER EDGAR DR ,  BRANDRUP JOHANN DR ,  WEINLICH JUERGEN DR

    IPC: C08F14/00 ,  C07D277/82 ,  C08F2/00 ,  C08F2/16 ,  C08F291/00 ,  C08F14/06

    Abstract: This invention is directed to a process for the preparation of vinyl chloride homopolymers, copolymers thereof with other monomers or graft copolymers containing at least 50% by weight of vinyl chloride units. The monomer or monomer mixture is polymerized in aqueous dispersion in the presence of a radical-forming catalyst in a reactor. The inner walls of the reactor and other portions thereof where polymer deposits may form are coated with a coating containing a compound of the formula I (I) wherein R1 is hydrogen, a hydrocarbon radical of aliphatic character having from 1 to 12 carbon atoms, an acyl having from 2 to 8 carbon atoms, R2 is R1 or R2 and R1 together are alkylidene or aralkylidene, R3 is hydrogen or a hydrocarbon radical of aliphatic character having from 1 to 12 carbon atoms; or at least one of the radicals, R1, R2 or R3 being hydrogen, R4 is R3, furthermore alkoxy having from 1 to 6 carbon atoms, hydroxyl, halogen, amino, (di)alkylamino having from 1 to 12 carbon atoms, carboxyl, sulfoxyl (=SO3H); R5 is R4; or R4 and R5 together are an aromatic ring.

    Vinyl chloride polymers - having low residual monomer content
    4.
    发明专利
    Vinyl chloride polymers - having low residual monomer content 未知

    公开(公告)号：DE2429777A1

    公开(公告)日：1976-01-02

    申请号：DE2429777

    申请日：1974-06-21

    Applicant: HOECHST AG

    Inventor： WEINLICH JUERGEN DR ,  BOETSCH FRANZ DR

    IPC: C08F6/00 ,  C08F6/20 ,  C08F6/24

    Abstract: A process of prodn. of homo- or copolymers contg. >=80 wt. % polymerised vinyl chloride comprises polymerise. of the monomer(s) in aqs. emulsion or suspension, removing the bulk of the unreacted monomer, according to known methods, evaporating 0.5 to 20 kg water per 100 kg dispersion at a pressure of 150 to 650 torr over a time of >=15 mins. and if necessary removing and drying the polymer. Pref. 0.5 to 5 kg of water per 100 kg dispersion is evaporated within 30 to 360 mins and at a pressure of 200-450 Torr. Polymers can be obtd. with a residual monomer content of 0.005 wt. % vinyl chloride. The process can be used for prodn. of vinyl chloride homopolymers or its copolymers with aliphatic vinyl esters, vinyl ethers, acrylic and methacrylic acid esters, butadiene, acrylonitrile and styrene.

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