Compositions of coated water-soluble polymers, their manufacture and their use to prepare aqueous solutions for use in enhanced oil recovery
AssigneeInstitut Francais du Petrole
InventorsFrancois Dawans, Daniel Binet, Norbert Kohler, Quang Dans Vu
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Abstract
A solid composition of coated water-soluble polymer is made from 80 to 250 parts b.w. of solid particles of at least one water-soluble polymer coated with 100 parts b.w. of at least one paraffinic product solid at room temperature and whose melting point is preferably from 40.degree. to 90.degree. C. The solid composition is made by dispersing particles of the water-soluble polymer in the molten paraffinic product and then cooling down to room temperature.
Claims26
A solid composition comprising solid particles of a water-soluble polymer coated with a protective coating consisting essentially of a paraffinic material which is a solid at room temperature, the amount of said protective coating being sufficient to protect said water-soluble polymer particles against humidity, agglomeration, microgel formation and oxidative degradation while nevertheless rendering said solid particles quickly dispersible in hot water, wherein said water-soluble polymer is polyvinyl alcohol, a cellulose derivative, a polysaccharide, polyacrylic acid, polymethacrylic acid, a polyacrylate or polymethacrylate salt, polyacrylamide, polymethacrylamide, poly-N,N-dimethylaminoacrylamide or an acrylamide-acrylic acid, ethylene-acrylic acid or styrene-maleic acid copolymer.
Dependencies are inferred from the claim text.