Celanese International Corporation

Clearswift Limited

Kevin Schofield

Alistair John McLennan

Hans Uwe Faust

Istvan Biro

A polymer dispersion comprising an aqueous, continuous phase and dispersed particles of polyurethane, which is based on organic, non-aromatic isocyanates with a functionality of at least 2, said polyurethane having a high degree of crystallinity and whose crystalline phase has a melting point between 25 and 70&#xb0; C., and a copolymer and/or terpolymer having a T(glass transition temperature) between &#x2212;20 and +50&#xb0; C. obtainable by emulsion polymerization of ethylenically unsaturated monomeric materials containing only C, H, O and/or N atoms, which monomeric materials comprise from 0.5 to 15 percent on the total of monomeric materials of monomers containing at least one nitrile group, in a weight ratio between 50:50 and 10:90 (polyurethane to emulsion polymer), in which the particles of the dispersion are in the form of multiphase particles comprising said polyurethane and said copolymer and/or terpolymer and which dispersion is obtainable by emulsion polymerization of the monomeric materials in the presence of the polyurethane dispersion, said eventual polymer dispersion having a solids content of 30 to 70%. The invention also comprises the use of these dispersions as an adhesive, especially for heat seal laminating, preferably for 3-D(imensional) Laminating. The dispersion is also useful as a size for glass fibers.

Polymer dispersion comprising particles of polyurethane and a copolymer or terpolymer produced by emulsion polymerization of olefinically unsaturated monomers

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Warrington, United Kingdom

Kevin Schofield