Production of polyvinyl alcohol having improved characteristics
First Claim
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1. A PROCESS OF PRODUCING POLYVINYL ALCOHOL OF IMPROVED CHARACTERISTICS WHICH COMPRISES HOMOPOLYMERIZING VINYL ACETATE IN A POLYMERIZATION SYSTEM CONTAINING A FREE RADICAL POLYMERIZATION CATALYST AND FROM 35% TO 60% BY WEIGHT OF VINYL ACETATE AND FROM 5% BY WEIGHT OF BORIC ACID, AND SAPONIFYING THE RESULTANT POLYMER TO PRODUCE POLYVINYL ALCOHOL.
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1 Claim
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1. A PROCESS OF PRODUCING POLYVINYL ALCOHOL OF IMPROVED CHARACTERISTICS WHICH COMPRISES HOMOPOLYMERIZING VINYL ACETATE IN A POLYMERIZATION SYSTEM CONTAINING A FREE RADICAL POLYMERIZATION CATALYST AND FROM 35% TO 60% BY WEIGHT OF VINYL ACETATE AND FROM 5% BY WEIGHT OF BORIC ACID, AND SAPONIFYING THE RESULTANT POLYMER TO PRODUCE POLYVINYL ALCOHOL.
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Current AssigneeKiyokazu Imai
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Original AssigneeKiyokazu Imai
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InventorsKIYOKAZU IMAI
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Application NumberUS04/111,436Time in Patent Office1,506 DaysField of SearchUS Class Current525/62CPC Class CodesC08F 118/08 Vinyl acetateC08F 8/12 HydrolysisC08J 5/18 Manufacture of films or sheets
