Oy Polymer Corex Kuopio Ltd.

Kristiina Haasmaa

Soili Hellevi Peltonen

Arto Olavi Urtti

Timo Petteri Paronen

Maija Elina Heikkil&auml;

Jani Vuorenp&auml;&auml;

The invention relates to a hydrophobic polymer dispersion and a solvent-free process for the preparation thereof. According to the invention, the dispersion contains starch ester together with dispersion admixtures known as such. According to the process, the polymer is first mixed with a plasticizer in order to obtain a plasticized polymer blend. The plasticized polymer blend is then mixed with dispersion admixtures and water at an elevated temperature so as to form a dispersion. The plasticizing of the polymer and the dispersion of the mixture in water can be performed in an extruder. The obtained dispersion is homogenized in order to improve its stability. The dispersion obtained by the invention can be used to coat paper or board, as a primer or a component in paint or labeling adhesives, and it is also suitable for the production of cast films and as a binder in materials based on cellulose fibers, as well as for coating medicinal preparations.

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Espoo, Finland

Kristiina Haasmaa