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AssigneeBayer Aktiengesellschaft
InventorsPeter Muller, Kuno Wagner, Christian Wegner, Peter Schwabe
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A process for producing an inorganic-organic composition material based on gypsum and polyurethane comprising exposing calcined gypsum or anhydrite to the action of water in the presence of a polyurethane or polyurethane-urea which is dispersible in water and in the presence of up to about 20% by weight (relative to the total mixture) of an alcohol and up to about 20% by weight (relative to the total mixture) of another organic solvent, and allowing the composition to set while permitting any solvents which may be present to evaporate. The calcium sulphate may be on a textile support or the composition may be molded into flexible shaped articles of good mechanical properties.
A process for producing an inorganic-organic fixed dressings based on gypsum and polyurethane comprising contacting a textile support carrying calcined gypsum or anhydrite with an aqueous dispersion of a polyurethane or polyurethane-urea which dispersion contains up to about 20% by weight (relative to the total mixture) of an alcohol and up to about 20% by weight (relative to the total mixture) of another organic solvent, each 100 grams of polyurethane or polyurethane-urea having about 0.1-130 milli-equivalents of ionic groups or of groups which can be converted into ionic groups, and allowing the composition to set while permitting any solvents which may be present to evaporate.
Dependencies are inferred from the claim text.