Patent ID: 6316543
Filing Date: 2001-11-13
Classification: C08G,C09D,Y10S

Abstract:
A process for preparing an isocyanate based, curable oil-in-water emulsion having a VOC content of about 2.1 lbs/gal (252 g/l) or less, comprising the steps of:(i) adding to (b), comprising a mixture of (b1) a surface active isocyanate reactive material and (b2) an aqueous medium, wherein in the mixture (b) the surface active isocyanate reactive material (b1) is water dispersible; (a), an unblocked isocyanate crosslinking agent containing at least two reactive isocyanate groups and being in and of itself substantially hydrophobic and non-dispersible in water; in proportions and under conditions to produce a substantially homogenous curable water-in-oil emulsion having a VOC content of about 2.1 lbs/gal (252 g/l) or less; then(ii) admixing the curable water-in-oil emulsion from step (i) with an aqueous medium in proportions and under conditions to produce a substantially homogenous oil-in-water emulsion of the surface active isocyanate reactive material and the isocyanate crosslinking agent in water, the oil-in-water emulsion having aVOC content of about 2.1 lbs/gal (252 g/l) or less.