Preparation of copolymers of polyvinyl alcohols

Details Preparation of copolymers of polyvinyl alcohols Preparation of copolymers of polyvinyl alcohols

C - Chemistry, Metallurgy

08

F

402/497

C08F 8/00 (2006.01) C08F 8/30 (2006.01) C08F 116/06 (2006.01)

Patent

CA 1328031

ABSTRACT OF THE DISCLOSURE A one-step process for the preparation of high viscosity modified polyvinyl alcohols comprises forming at room temperature a water slurry of a polyvinyl alcohol having a degree of hydrolysis varying from about 90% to about 95% or more, an alpha, beta-unsaturated carbonyl compound modifying agent such as acrylamide wherein said polyvinyl alcohol and said modifying agent are present in a molar ratio of from about 1:10, and a base, and heating the mixture to a temperature of less than 100°C for a time sufficient to obtain the resultant modified high viscosity high molecular weight product. Such products have higher viscosity than those prepared via a two-step high temperature modification reaction.

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