Process for the continuous production of an ethylene/vinyl aceta

Details Process for the continuous production of an ethylene/vinyl aceta Process for the continuous production of an ethylene/vinyl aceta

1975-11-19

1977-07-12

Hayes, Lorenzo B.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 296MM, 260 296WA, 526331, C08L 3104

Patent

active

040353290

ABSTRACT:
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.

REFERENCES:
patent: 2703794 (1955-03-01), Roedel
patent: 3755237 (1973-08-01), Isaacs et al.
patent: 3773699 (1973-11-01), Bergmeister et al.
patent: 3817896 (1974-06-01), Bergmeister et al.
patent: 3883489 (1975-05-01), Matschke et al.

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