Patent · US Expired

Process for preparing protective-colloid-stabilized vinyl ester or vinyl ester-ethylene polymers in the form of their aqueous dispersions

US6262163A · kind A · utility

5Cited by

3References

12Claims

0Family size

Assignee

Wacker Chemie AG · DE

Inventors

Hans-Peter Weitzel · Reischach, DE
Udo Kotschi · Burghausen, DE
Manfred Hannebaum · Burghausen, DE

Key dates

Filing date	Mar 29, 1999
Grant date	Jul 17, 2001
Priority date	—
Expiry date	Mar 29, 2019

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F2/24
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to a process for preparing protective-colloid-stabilized vinyl ester or vinyl ester-ethylene polymers in the form of their aqueous dispersions by emulsion polymerization in the presence of one or more protective colloids, which comprises carrying out the polymerization in the presence of a hydrophobic but silane-free protective colloid based on (meth)acrylate polymers with from 80 to 95% by weight, based on the total weight of the copolymer, of acrylic or methacrylic esters of aliphatic alcohols having from 1 to 12 carbon atoms, and from 5 to 20% by weight, based on the total weight of the copolymer, of ethylenically unsaturated mono- or dicarboxylic acids, and with a glass transition temperature Tg of the copolymer of from 60 to 120.degree. C., and with a Fikentscher K value of the copolymer of from 20 to 50.

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