Water-disintegratable fibrous sheet
AssigneeUni-Charm Corporation
InventorsNaohito Takeuchi, Takayoshi Konishi
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Abstract
A fibrous sheet coated with a water-soluble binder of polyvinyl alcohol is impregnated with an aqueous solution dissolved with water-soluble carboxylate, so as to produce a water-disintegratable fibrous sheet. Salting out of the polyvinyl alcohol with the carboxylate maintains wet strength of the water-disintegratable fibrous sheet even in a wet state, which is easily disintegrated when immersed in a large amount of water after use. Furthermore, it does not suffer from deterioration in water-disintegratability and wet strength if it is left at high temperatures, and is good in water-disintegratability in cold water.
Claims7
A water-disintegratable fibrous sheet for use in wet conditions comprising fibers which are bound with a water-soluble binder and formed into a sheet form and a water-soluble carboxylate added to the sheet, wherein the binder consists of polyvinyl alcohol and the water-soluble carboxylate is for salting out the polyvinyl alcohol and consists of at least one selected from the group consisting of sodium tartrate, sodium citrate, potassium citrate, sodium malate, potassium malate and potassium tartrate, the basis weight of the fibers is 20-100 g/m2, and the water-soluble binder is present in an amount of 3-30 g per 100 g of fibers.
Dependencies are inferred from the claim text.