EP0095892A1 — Wound-covering materials

USPTO Abstract

A wound covering material produced by applying an aqueous solution containing a polyvinyl alcohol with a degree of hydrolysis not less than 95 mol.% and a viscosity-average degree of polymerization not less than 1,500, a water-soluble C 2-20 polyhydric alcohol having 2-8 hydroxyl groups in the molecule and a high-viscosity water-soluble macromolecular substance being different from polyvinyl alcohol with a viscosity of the 2 % aqueous solution of 25°C not less than 300 cP, concentrations of said polyvinyl alcohol, said water-soluble polyhydric alcohol and said water-soluble macromolecular substance being adjusted respectively to 1.5-8 % by weight, 10-85 % by weight and 0.2-15% by weight, onto a flat or curved plate having 30,000-200,000 projections per m 2 , the total area occupied by the projections being 10-70 % to a thickness from 0.5 to 5mm, cooling the applied plate to a temperature not higher than -6°C to solidify the solution and then subjecting the resulting mass to vacuum dehydration to a ratio of dehydration from 5 % by weight to 95 % by weight.