Patent ID: 9481788
Filing Date: 2016-11-01
CPC Classification: C08J,C08L,C09D

Claim Text:
1. A continuous process for preparing a stable aqueous epoxy resin dispersion in the absence of organic solvent, comprising: co-feeding a solid epoxy resin, a semi-crystalline polyvinyl alcohol dispersant, an optional liquid epoxy resin, and an optional finely divided co-dispersant into a melt blend zone of a shearing device; forming a melt blend of the solid epoxy resin, the semi-crystalline polyvinyl alcohol dispersant, the optional liquid epoxy resin, and the optional finely divided co-dispersant in the melt blend zone; combining the melt blend with water and an optional co-dispersant solution; and forming a high internal phase emulsion of the melt blend, the water, and the optional co-dispersant solution; wherein the solid epoxy resin has an epoxide equivalent weight of from 300 to 10000 g/eq and a molecular weight of from 1500 to 40000; and wherein the semi-crystalline polyvinyl alcohol dispersant is co-fed into the melt blend zone in a finely divided or granular state, yielding a solid content of at least 5.0 wt. % based on the total weight of epoxy resin plus semi-crystalline polyvinyl alcohol dispersant.