Patent · US Expired

Process for the production of gel-free ethylene/vinyl acetate copolymers with a high content of copolymerized vinyl acetate and a high mooney viscosity

US5576401A · kind A · utility

6Cited by

2References

3Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Roland Steiger · Dormagen, DE
Erhard Asch · Hanerau-Hademarschen, DE
Wolfgang Baade · Wildeshausen, DE
Werner Obrecht · Moers, DE

Key dates

Filing date	Oct 19, 1995
Grant date	Nov 19, 1996
Priority date	—
Expiry date	Oct 19, 2015

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F210/02
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.