-
公开(公告)号：BR8105079A
公开(公告)日：1982-04-20
申请号：BR8105079
申请日：1981-09-06
Applicant: HOECHST AG
Inventor： KLIPPERT H , ENGELMANN M , PASCHALIS S , TZSCHOPPE E , WEINLICH J
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.
-
公开(公告)号：BR8100562A
公开(公告)日：1981-08-18
申请号：BR8100562
申请日：1981-01-30
Applicant: HOECHST AG
Inventor： KLIPPERT H
-
公开(公告)号：BR8100559A
公开(公告)日：1981-08-18
申请号：BR8100559
申请日：1981-01-30
Applicant: HOECHST AG
Inventor： VLMSCHNEIDER D , KLIPPERT H
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.
-
-
Search Results
3
records
(took 0.02 seconds)
