发明授权
US4035329A Process for the continuous production of an ethylene/vinyl acetate
copolymer dispersion
失效
用于连续生产乙烯/乙酸乙烯酯共聚物分散体的方法
- 专利标题: Process for the continuous production of an ethylene/vinyl acetate copolymer dispersion
- 专利标题(中): 用于连续生产乙烯/乙酸乙烯酯共聚物分散体的方法
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申请号: US633591申请日: 1975-11-19
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公开(公告)号: US4035329A公开(公告)日: 1977-07-12
- 发明人: Hubert Wiest , Josef Hanzalik , Wilhelm Lechner , Erwin Lieb
- 申请人: Hubert Wiest , Josef Hanzalik , Wilhelm Lechner , Erwin Lieb
- 申请人地址: DT Munich
- 专利权人: Wacker-Chemie GmbH
- 当前专利权人: Wacker-Chemie GmbH
- 当前专利权人地址: DT Munich
- 优先权: DT2456576 19741129
- 主分类号: C08F2/00
- IPC分类号: C08F2/00 ; C08F2/22 ; C08F2/24 ; C08F4/00 ; C08F4/40 ; C08F10/00 ; C08F210/00 ; C08F210/02 ; C08F218/00 ; C08F218/02 ; C08F218/08 ; C08L31/04
摘要:
A process for the continuous manufacture of an aqueous ethylene/vinyl acetate copolymer dispersion which comprises continuously copolymerizing ethylene and vinyl acetate and optionally other .alpha.-olefinically unsaturated monomers, in an aqueous emulsion in the presence of an emulsifier and/or a protective colloid, and in the presence of a free-radical-forming redox catalyst system of a reducing agent and an oxidizing agent as well, optionally, as a heavy metal salt, and recovering said ethylene/vinyl acetate copolymer dispersion, characterized by (a) the presence of a molar excess of at least 3 times, preferably from 3 to 10 times, said reducing agent over said oxidizing agent dosed into the reaction medium and (b) adding the monomers continuously to the reaction mixture at such a rate that the concentration of unreacted monomers at no place in the reaction zone exceeds 15% by weight of the total weight of the reaction mixture.
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