Celanese Emulsions Gmbh

Celanese International Corporation

Harald Petri

Stephan Krieger

Ivan Cabrera

Thomas Fichtner

Thomas Wirth

Harmin Müller

Matthias Junk

Kerstin Gohr

Lizandra Belmonte Rodrigues De Castro

Carsten Heldmann

Hendrikus Van Boxtel

Thomas Drechsel

An aqueous polymer dispersion is produced by multistage emulsion polymerization, in which a monomer composition I comprising 19 to 29 wt % hard monomers and 64 to 74 wt % soft monomers is polymerized to produce a first polymer phase and then a monomer composition II comprising 65 to 95 wt % hard monomers and 5 to 35 wt % soft monomers is polymerized to produce a second polymer phase. Monomer composition I also comprises from 1 to 5 wt % of at least one monomer selected from ethylenically unsaturated sulfonic acids, phosphonic acids, phosphoric acids, carboxylic acids, carboxylic amides, carboxylic anhydrides and mixtures thereof and 1 to 7.5 wt % of ethylenically unsaturated monomers containing keto groups. The weight ratio of monomer composition I to monomer composition II ranges from 50:50 to 65:35 and the polymer dispersion also contains a water-soluble cross-linking component selected from polyfunctional carboxylic hydrazides and/or polyfunctional amines.

Aqueous polymer dispersions

What are described are coating compositions comprising pigments and/or fillers and multistage polyvinyl ester dispersions as binders. These binders are produced by a selected multistage process in which a polyvinyl ester dispersion is obtained in a first stage, monomers in dissolved or pure form or in the form of an emulsion are added to the reaction mixture in a second stage and then the polymerization is started again. The polyvinyl ester dispersions comprise polymerized silanes and/or epoxides or the polyvinyl ester dispersions have only a small content of protective colloids, if any. The coating compositions formulated with the multistage polyvinyl ester dispersions obtained in this way are notable for a very high weathering resistance.

Coating compositions having high weathering resistance, process for preparation thereof and use thereof

Aqueous copolymer dispersions for a variety of uses, including coating compositions or binders for plasters and paints, are disclosed. The aqueous copolymer dispersions may comprise one or more silicon containing compounds, in particular hydrolyzable silane compounds without any additional reactive group.

Emulsion polymers with improved wet scrub resistance having one or more silicon containing compounds

A description is given of a process of emulsion polymerization of free-radically polymerizable ethylenically unsaturated monomers selected from the group of the monoesters or diesters of ethylenically unsaturated monocarboxylic or dicarboxylic acids with alkanols, vinyl esters and/or vinylaromatics and, if desired, further monomers copolymerizable therewith, at least 60% of the total conversion in the polymerization taking place at a temperature of 100&#xb0; C. to 160&#xb0; C., the polymerization being performed in the presence of emulsifiers and an amount of 0% to 1% by weight, based on the total amount of the monomers used, of protective colloid. The process can be used to obtain significantly faster conversions for comparable quality of the process products. The dispersions obtained can be employed in a wide variety of different applications, such as binders for paints or as adhesives.

Process for preparing polymer dispersions, the resulting dispersions and their use

Multistage polymers predominantly stabilized by nonionic emulsifiers and derived from hard and soft monomer compositions containing vinyl esters, of which at least one monomer composition must contain an unsaturated compromisable organosilicon compound, are described. The plastic dispersions can be used as binders in emulsion paints and finishes and impart to these excellent scrub resistance in addition to good blocking resistance.

Aqueous plastic dispersions, method for producing the same and their use

The present invention relates to aqueous plastic material dispersions based on vinyl ester copolymers, having a solids content of up to 80% by weight and a minimum film formation temperature below 20&#xb0; C., which is substantially stabilized by ionic components, the vinyl ester copolymers containing at least one homo- or copolymer A and at least one homo- or copolymer B, methods for producing the same and the use thereof.

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Aarbergen, Germany

Harald Petri