Air Products and Chemicals, Inc.

James F Nangeroni

Amir F Famili

Finn L Marten

F Lennart Marten

Amir Famili

Lloyd Mahlon Robeson

Brian Thomas Carvill

Stephen Charles Webb

Beth Ann Frey

Finn Lennart Marten

An improved process for the continuous production of poly(vinyl alcohol) which involves purifying poly(vinyl acetate) paste exiting from a polymerization reactor and dissolving the substantially pure poly(vinyl acetate) in a hydrolytic alcohol-containing solvent for subsequent saponification to produce poly(vinyl alcohol). Poly(vinyl acetate) paste, containing poly(vinyl acetate), vinyl acetate, and solvent, is heated to a temperature above the glass transition temperature but below a temperature which will degrade the poly(vinyl acetate) and is fed into a flashing area of an extruding devolatilization device. Vinyl acetate and solvent are flashed through vent ports in the flashing area of the devolatilization device and can then be recycled to a polymerization reactor, if desired. A substantially pure poly(vinyl acetate) melt, exiting the flashing area, is conveyed to a mixing area of the devolatilization device where it is mixed with a hydrolytic alcohol-containing solvent to form a solution for subsequent processing in a saponification unit.

Continuous process for the preparation of poly(vinyl acetate) for

A method for preparing a compatible blend of polyolefin and thermoplastic polyvinyl alcohol comprising: (a) melting polyolefin in the initial elements of a melt extruder, (b) adding and melt blending an unsaturated carboxylic acid or anhydride with the melted polyolefin downstream in the extruder, (c) adding peroxide to the melt blend and grafting the unsaturated carboxylic acid or anhydride onto the polyolefin, and (d) melt blending thermoplastic PVOH into the grafted polyolefin/unsaturated carboxylic acid or anhydride melt mixture.

Reactive melt extrusion grafting of thermoplastic polyvinyl

An extrudable polyvinyl alcohol composition useful for packaging and molding applications is prepared by melt blending polyvinyl alcohol and thermoplastic modified starch to provide a product which has reduced water sensitivity, improved modulus and reduced elongation at high relative humidity. A method for extruding the polyvinyl alcohol composition comprises:

Extrudable polyvinyl alcohol compositions containing modified starches

A multilayer structure, especially a multilayer film, for packaging alkaline, or caustic, compositions. The multilayer structure consists essentially of:

Water soluble multilayer film for packaging alkaline materials

An extrudable polyvinyl alcohol composition useful for packaging and molding applications is prepared by melt blending polyvinyl alcohol and thermoplastic polyethylene oxide to provide a product which has improved pH stability and salt solution solubility. Useful extruded articles prepared from such compositions include films and containers. A method for extruding the polyvinyl alcohol composition comprises:

Extrudable polyvinyl alcohol compositions containing thermoplastic

A method for extruding polyvinyl alcohol which comprises

Melt extrudable polyvinyl alcohol pellets having reduced maximum melt

A method for extruding polyvinyl alcohol which includes

Method for making extrudable polyvinyl alcohol compositions

An extruable polyvinyl alcohol composition useful for packaging and molding applications is prepared by melt blending polyvinyl alcohol and thermoplastic polyurethane to provide a product which has low water absorptivity, improved impact resistance, and improved low temperature/low humidity tensile properties. Useful extruded articles prepared from such compositions include films and bottles. A method for extruding the polyvinyl alcohol composition comprises:

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Allentown, PA, United States of America

James F Nangeroni