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US 5,688,870 AGranted
Process for preparing water dispersible polymer powders
AssigneeAir Products and Chemicals, Inc.
InventorsSteven Paul Wilkinson, Lloyd Mahlon Robeson
Life of this patent
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Abstract
Water dispersible polymeric powders are prepared in liquid/supercritical CO.sub.2 by the sequential polymerization of a water soluble polymer after the polymerization of a non-water soluble polymer using core-shell polymerization technology.
Claims9
A process for the production of a water dispersible polymeric powder comprising:
- a) adding to a reactor a first monomer, an initiator, a CO.sub.2 -phillic surfactant, and liquid or supercritical CO.sub.2 to form a non-water soluble core polymer;
- and
- b) subsequently adding a second monomer, along with an initiator, to the reactor containing liquid or supercritical CO.sub.2 to form a water soluble or water dispersible shell polymer on the non-water soluble core polymer, thereby forming a core-shell polymer.
Dependencies are inferred from the claim text.