Patent ID: 8187457
Filing Date: 2012-05-29
Classification: G01N,Y10T

Abstract:
1. A test paper comprising a porous membrane having a function of separating an object that should be filtered out from a sample by filtration and carrying thereon a reagent capable of giving a color by reaction with a specified component in the sample, wherein said porous membrane has a first layer having a surface to which a sample is supplied and a second layer having a surface at which the sample is percolated and measured, said first layer being made of large-sized pore portions whose section density is 40% or less, with a surface of said first layer being a smooth surface having apertures thereat, said second layer being made of small-sized pore portions whose section density exceeds 40%, with a surface of said second layer having apertures thereat, wherein said first layer and said second layer together constitute a single membrane portion formed by a single casting operation, and wherein said porous membrane has a thickness of 50 to 200 μm and a porosity of 60 to 95%, said first layer has an average pore size of 0.5 to 10 μm in the surface thereof, and said first layer is located from the surface of said first layer within a range of ⅕ to ½ of a thickness of said porous membrane, and said second layer has an average pore size of 0.1 to 3.0 μm in the surface thereof, and said second layer has a surface glossiness according to JIS Z8741 not higher than 11.