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US 5,331,045 AGranted
Polyvinyl alcohol esterified with lactic acid and process therefor
AssigneeE. I. Du Pont de Nemours and Company
InventorMaria Spinu
Life of this patent
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Abstract
Polyvinyl alcohol esterified by lactic is produced by dissolving polyvinyl alcohol and lactic acid in water, and removing the water by volatilization at a temperature of 75.degree. C. to 175.degree. C. The lactic acid esterified polyvinyl alcohol is useful as a molding resin, and in films, fibers and adhesives.
Claims4
A polymer comprising polyvinyl alcohol in which at least 1% of hydroxyl groups in said polyvinyl alcohol are esterified with lactic acid, and wherein each lactic acid ester group contains an average of 1.0 to about 3 lactic acid units.
Dependencies are inferred from the claim text.