Polyvinyl Alcohol Coated Cellulosic Products
AssigneeAquapak Polymers Limited
InventorsJohn Williams, Sian Griffiths, Robert Ashworth, David Lee Meadows
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Abstract
A method of manufacture of a coated material is provided. A polyvinyl alcohol polymer, where the polyvinyl alcohol polymer has a degree of hydrolysis of 90% or greater and a melting point in the range of 180° C. to 225° C. is melted on a cellulosic substrate and extruded to form a molten polyvinyl alcohol polymeric film which is then applied directly to the surface of the substrate to form the coated material.
Claims23
A method of manufacture of a coated material comprising the steps of:
- providing a cellulosic substrate;
- melting a polyvinyl alcohol polymer, wherein the polyvinyl alcohol polymer has a degree of hydrolysis of 90 wt % or greater and a melting point in the range of 200° C. to 225° C.;
- extruding the melted polyvinyl alcohol polymer to form a molten polyvinyl alcohol polymeric film;
- applying the molten film directly to the surface of the substrate;
- and
- allowing the film to solidify on the surface to form a coated material.
A coated material comprising a cellulosic substrate directly coated with a polyvinyl alcohol polymer, wherein the polymer has a degree of hydrolysis of 90 wt % or greater and a melting point of 180° C. to 225° C.;
- and
- wherein the polymer dissolves within 10 minutes in water at a temperature from about 30° C. to about 60° C. to allow release of 100% cellulosic fibres from the coated substrate.
Dependencies are inferred from the claim text.