Oxyalkylene group-containing polyvinyl alcohol resin composition and process for the production of shaped articles from said composition
AssigneeNippon Gohsei Kagaku Kogyo Kabushiki Kaisha
InventorsMunetoshi Tomita, Shinji Noma, Tamae Suzuki
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Abstract
The invention provides an oxyalkylene group-containing PVA resin composition with an alkali metal acetate content of 0.001.about.1 weight % and an oxyalkylene group-containing PVA resin composition with an alkali metal acetate content of 0.001.about.1 weight %, which further contains 0.1.about.10 moles of an acid with a pKa value of not more than 5.0 per mole of the alkali metal acetate, optionally together with 0.01.about.5 weight of a phenol compound which melts at 50.degree..about.250.degree. C., a thioether or a phosphite based on the polyvinyl alcohol and/or 0.01.about.3 weight % of a fatty acid compound based on the polyvinyl alcohol.
Claims6
A water-soluble oxyalkylene group-containing polyvinyl alcohol resin composition having a torque ratio T.sub.60 /T.sub.3 of 1 to 6 comprising:
- a water-soluble oxyalkylene group-containing polyvinyl alcohol obtained by copolymerizing vinyl acetate with a polyoxyalkylene mono(meth) allyl ether, wherein the copolymerization ratio of polyoxyalkylene mono(meth) allyl ether is 0.1 to 5 mole %, the average degree of condensation of polyoxyalkylene in said polyoxyalkylene mono(meth)allyl ether is 4 to 50, the proportion of the oxyalkylene unit in the whole oxyalkylene group-containing polyvinyl alcohol is 3 to 40 weight %;
- and saponifying the resultant copolymer, the average degree of saponification of the vinyl acetate in the copolymer being 70 to 100 mole %;
- 0.001 to 0.3% of an alkali metal acetate based on the weight of the oxyalkylene group-containing polyvinyl alcohol;
- and
- 0.1 to 10 moles of an acid having a pKa value of not more than 5.0 per mole of the alkali metal acetate.
Dependencies are inferred from the claim text.