C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/499
C08F 8/00 (2006.01) C08F 8/12 (2006.01)
Patent
CA 1211893
TITLE PROCESS FOR CONTINUOUS CONTROLLED ALCOHOLYSIS OF POLYVINYL ACETATE ABSTRACT OF THE DISCLOSURE Improved process for the preparation of partially alcoholyzed polyvinyl acetate having good compositional uniformity comprises rapid premixing of the polyvinyl acetate polymer and base catalyst solutions in a static mixer and carrying out the alcoholysis reaction in an intermeshing, self-wiping, twin-motor mixing extruder. The process yields polyvinyl alcohol product having a maximum hot water insoluble fraction of about 1.1% by weight obtained by the proper adjustment of the feed temperature, the shear rate in the premixer, and the catalyst concentra- tion in the catalyst feed solution.
391972
E.i. Du Pont de Nemours And Company
Mccallum Brooks & Co.
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