Wacker-Chemie Gmbh

Wacker Chemie Ag

Walter Dobler

Klaus Kohlhammer

Gerhard Koegler

Monika Rockinger

Abdulmajid Hashemzadeh

Hermann Petersen

Peter Ball

Rudolf Weissgerber

Hardy Herold

Wilfried Huster

Peter Brandmueller

Mihai Gurau

Klaus Kohlammer

Water-redispersible polymer powders with improved characteristics in building materials are prepared using a drying aid which is a polyvinyl alcohol copolymer also containing vinyl ester monomers and specific comonomers.

Dispersion powder composition containing vinyl alcohol copolymerisate

Compositions containing addition polymers prepared using crosslinkable protective colloids

The invention relates to a process for preparing an aqueous polymer dispersion for removable pressure-sensitive adhesive films by means of free-radically initiated aqueous emulsion polymerization of one or more ethylenically unsaturated monomers from the group consisting of esters of acrylic acid and methacrylic acid with branched or unbranched alcohols having 1 to 12 carbon atoms, vinyl esters of branched or unbranched carboxylic acids having 1 to 12 carbon atoms, vinyl-aromatics, vinyl halides, olefins and dienes, which comprises copolymerizing from 0.01 to 2.0% by weight of polar, ionic or nonionic comonomers or mixtures thereof, and if polar ionic comonomers, alone or in a mixture, are copolymerized, the proportion thereof is not more than 1.0% by weight, and the amounts in % by weight are based in each case on the overall weight of the comonomers.

Process for preparing an aqueous polymer dispersion for redetachable pressure sensitive adhesive films

A water-soluble, crosslinkable protective colloid is provided having a weight-average molecular weight of least than 500,000 comprising: a) 20 to 95% by weight of monomer units containing sulphonic acid or sulphonate groups, b) 4 to 80% by weight of monomer units containing N-methylol or N-alkoxymethyl groups, and c) 0.1 to 20% by weight of hydrophobic monomer units such as water insoluble ethylenically unsaturated compounds and the hydrophobic end groups of initiator radicals or regulator molecules. Optionally, up to 50% by weight of the monomer units containing sulphonic acid or sulphonate groups can be replaced by monomer units containing carboxyl groups or monomer units containing amide groups.

Crosslinkable protective colloids for use in the polymerization of unsaturated monomers

Water-soluble cross-linkable copolymers

Graft and core-shell copolymers having improved phase bonding between

The invention relates to a method of using aqueous polymer dispersions based on acrylate-methacrylate copolymers as lamination adhesives for heat sealed glossy films, where the aqueous polymer dispersions have a solids content of from 20 to 65% by weight, the copolymer has a glass transition temperature of from -35.degree. to -10.degree. C., a K value of from 40 to 100 and a mean particle size of less than 200 nm, and the copolymer is obtainable by free-radical emulsion polymerization of:

Method of using aqueous polymer dispersions as lamination adhesives for

Graft copolymers having improved phase binding between the graft base and the grafted-on polymer, are prepared from:

Graft copolymers having improved phase binding between the graft base

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Tann, Germany

Walter Dobler