Dispersions of crosslinked polymer micro-particles in...

Details Dispersions of crosslinked polymer micro-particles in... Dispersions of crosslinked polymer micro-particles in...

C - Chemistry, Metallurgy

08

G

117/147, 400/741

C08G 18/42 (2006.01) C08G 18/08 (2006.01) C08G 18/75 (2006.01) C09D 175/06 (2006.01)

Patent

CA 1299309

Abstract of the Disclosure: Dispersions of crosslinked polymer micro-particles in aqueous media, a process for the preparation of these dispersionsr and coating compo- sitions containing these dispersions. The invention relates to dispersions of crosslinked poly- mer micro-particles in aqueous media, which have been pre- pared: (1) by dispersing a mixture of the components (A) and (B) in an aqueous medium, the component (A) being composed of one or more polyester-polyols contain- ing at least 2 hydroxyl groups, and the component (B) being composed of one or more polyisocyanate compounds, and the component (A) having avail- able a number of ionic groups, preferably carboxy- late groups, sufficient to form a stable disper- sion, and at least one part of the components (A) and/or (B) containing more than 2 hydroxyl or isocyanate, respectively, groups per molecule and (2) by subsequently heating the dispersion thus ob- tained to a temperature sufficiently high for the components (A) and (B) to react to form cross- linked polymer micro-particles.

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