Process for the production of gel-free ethylene/vinyl acetate co

Details Process for the production of gel-free ethylene/vinyl acetate co Process for the production of gel-free ethylene/vinyl acetate co

1995-10-19

1996-11-19

Weber, Thomas R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymerizing in two or more physically distinct zones

526212, 526331, C08F 206

Patent

active

055764010

ABSTRACT:
Gel-free ethylene/vinyl acetate copolymers with a high content of copolymerized vinyl acetate and a high Mooney viscosity are produced by carrying out the polymerization in solution in the presence of 20 to 45% by weight tert.butanol, based on the reaction solution, at temperatures of 50.degree. to 80.degree. C. and under pressures of 300 to 450 bar using azo compounds in a cascade of stirred reactors with an average residence time of the reaction solution in the reactor cascade of 5 to 9 hours and a conversion of 50 to 70% by weight, based on the vinyl acetate used. The ethylene/vinyl acetate copolymers produced by the process according to the invention may be used for the production of vulcanizates having improved mechanical properties.

REFERENCES:
patent: 4937303 (1990-06-01), Wolf et al.
patent: 5093450 (1992-03-01), Baade et al.

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