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    CONTINUOUS PROCESS AND DEVICE FOR THE MANUFACTURE OF A VINYL CHLORIDE POLYMER IN AQUEOUS SUSPENSION
    1.
    发明专利
    CONTINUOUS PROCESS AND DEVICE FOR THE MANUFACTURE OF A VINYL CHLORIDE POLYMER IN AQUEOUS SUSPENSION 未知

    公开(公告)号：CA1215500A

    公开(公告)日：1986-12-16

    申请号：CA383291

    申请日：1981-08-06

    Applicant: HOECHST AG

    Inventor： KLIPPERT HEINZ ,  TZSCHOPPE EBERHARD ,  PASCHALIS STRATOS ,  WEINLICH JUERGEN ,  ENGELMANN MANFRED

    IPC: C08F14/00 ,  B01J19/18 ,  C08F2/00 ,  C08F2/18 ,  C08F2/20 ,  C08F14/06 ,  C08F291/00

    Abstract: The process described is carried out in at least two reaction zones, plug flow of the polymerization mixture being maintained in all the reaction zones. In the first reaction zone, polymerization is carried to a conversion of not more than 10 % and, in the course thereof, the polymerization mixture is agitated sufficiently to establish the desired particle size morphology, preferably at a stirring energy per unit volume of 0.1 to 5 kWm-3. Particularly in the second reaction zone, the formation of polymer incrustations on the surfaces coming into contact with the polymerization mixture is prevented, preferably by ensuring that the polymerization mixture comes exclusively into contact with smooth, non-metallic surfaces. The device preferably comprises three reactors, all of which have a length/diameter ratio of at least 4, the first reactor standing in a vertical position and the other two reactors being in an approximately horizontal position. This makes it possible to manufacture, over a long period, vinyl chloride polymers at good space-time yields and with a constant and good pattern of properties and a narrow particle size distribution.

    4.
    发明专利
    未知

    公开(公告)号：DD200117A5

    公开(公告)日：1983-03-23

    申请号：DD23244381

    申请日：1981-08-06

    Applicant: HOECHST AG

    Inventor： KLIPPERT HEINZ ,  TZSCHOPPE EBERHARD ,  PASCHALIS STRATOS ,  WEINLICH JUERGEN ,  ENGELMANN MANFRED

    IPC: C08F14/00 ,  B01J19/18 ,  C08F2/00 ,  C08F2/18 ,  C08F2/20 ,  C08F14/06 ,  C08F291/00

    Abstract: In the manufacture of polymer suspensions, good spacetime yields, a narrow particle size distribution and good polymer properties are obtained in a relatively uncomplicated apparatus which includes a plurality of reactors having a length/diameter ratio of at least 4, the first reactor standing vertically and the others approximately horizontally. Plug flow of the polymerization mixture is maintained in the reaction zones provided by the reactors. In the first such zone, up to 10% of the polymerization is carried out, with agitation, preferably at a stirring energy per unit volume of 0.1 to 5 kWm-3. Wall encrustation is substantially prevented, particularly in the second reaction zone, through the use of smooth, non-metallic surfaces in the zone.

    6.
    发明专利
    未知

    公开(公告)号：DD156083A5

    公开(公告)日：1982-07-28

    申请号：DD22733281

    申请日：1981-01-30

    Applicant: HOECHST AG

    Inventor： KLIPPERT HEINZ ,  ULMSCHNEIDER DIETER

    IPC: C08F2/20 ,  C08F14/06 ,  C08F291/00

    Abstract: A process for the polymerization of vinyl chloride in an aqueous phase in the presence of oil-soluble free-radical initiators and a mixture of at least two high-molecular, surface-active suspending agents is described. This mixture is composed of 10 to 90% by weight (relative to the mixture) of at least one copolymer formed from vinyl acetate and a compound of the formula R1-CO-NR2-CH=CH2 wherein R1 is H or alkyl having 1 to 4 C atoms and R2 is H or methyl, and of 90 to 10% by weight (relative to the mixture) of at least one cellulose ether or a partially acetylated polyvinyl alcohol. Homopolymers, copolymers or graft copolymers of vinyl chloride which have an improved combination of properties are obtained.

    7.
    发明专利
    未知

    公开(公告)号：MX159064A

    公开(公告)日：1989-04-14

    申请号：MX18865381

    申请日：1981-08-07

    Applicant: HOECHST AG

    Inventor： KLIPPERT HEINZ ,  TZSCHOPPE EBERHARD ,  PASCHALIS STRATOS

    IPC: C08F14/00 ,  B01J19/18 ,  C08F2/00 ,  C08F2/18 ,  C08F2/20 ,  C08F14/06 ,  C08F291/00

    Abstract: In the manufacture of polymer suspensions, good spacetime yields, a narrow particle size distribution and good polymer properties are obtained in a relatively uncomplicated apparatus which includes a plurality of reactors having a length/diameter ratio of at least 4, the first reactor standing vertically and the others approximately horizontally. Plug flow of the polymerization mixture is maintained in the reaction zones provided by the reactors. In the first such zone, up to 10% of the polymerization is carried out, with agitation, preferably at a stirring energy per unit volume of 0.1 to 5 kWm-3. Wall encrustation is substantially prevented, particularly in the second reaction zone, through the use of smooth, non-metallic surfaces in the zone.

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