Compositions for forming water-disintegrable coats.

摘要

Comprising paper composed mainly of fibrous carboxymethylcellulose or fibrous carboxyethylcellulose having a degree of etherification of 0.1 to 1.0 and prepared by the paper-making process, the water-disintegrable support material of this invention is characterized in that the degree of base saturation of the fibrous carboxymethylcellulose or carboxyethylcellulose forming a major fibrous part of said support material is 20 % or more, and a solution or dispersion of said paper is in the pH range of 5.0 to 8.0. The composition for forming the water-disintegrable coat of this invention, which is to be coated on the above-mentioned support, is characterized by comprising a mixture of (a) at least one water-insoluble resin capable of forming a film having a saturation hygroscopicity less than 15 % at a 90 % relative humidity with (b) at least one water-soluble resin capable of forming film having a saturation hygroscopicity of 15 % or more at a 90 % relative humidity, and (c) a solvent in which both the resins (a) and (b) can dissolve. The device for assaying a body fluid according to this invention is obtained by providing a body fluid assay reagent layer on at least a part of the above-mentioned coat on the support material, and so is improved in terms of both maneuverability/toughness during inspection and disintegrability after use.