Celanese Emulsions Gmbh

Hans Uwe Faust

Jörg Ludwig Schulte

Harmin Müller

Alexander Madl

Martin Schäfer

An aqueous dispersion of a vinyl ester/ethylene copolymer is prepared by emulsion copolymerization of a monomer mixture comprising a vinyl ester, ethylene and a polyvinyl alcohol stabilizing system consisting essentially of (a) about 0.5 to about 3 wt. % based on the total monomer weight of a first polyvinyl alcohol having a degree of hydrolysis of at least 98 mole % and (b) about 1 to about 4 wt. % based on the total monomer weight of a second polyvinyl alcohol having a degree of hydrolysis of about 85 to about 90 mole % and a weight average molecular weight of at least 85,000 g/mol.

Vinyl ester/ethylene copolymer dispersions for use in adhesive formulations

A description is given of an aqueous vinyl ester copolymer dispersion stabilized with a combination of at least one protective colloid and of at least one emulsifier, said dispersion having a viscosity of less than 8000 mPa*s, a weight average dof the particle sizes of 0.5 to 10 &#x3bc;m, and a ratio of weight average to number average of the particle sizes, d/d, of at least 2.5, and the polymer possessing a glass transition temperature of between &#x2212;30 and +15&#xb0; C. The dispersion can be used as an adhesive for nozzle application processes.

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Liederbach, Germany

Hans Uwe Faust