Patent ID: 9187579
Filing Date: 2015-11-17
Classification: A61F,C08F,C08K,C08L,Y10T

Abstract:
1. A particle-shaped water absorbing agent containing a resin of an acrylic acid and/or a salt thereof in a range of 70 to 99.9% by weight to the particle-shaped water absorbing agent, the particle-shaped water absorbing agent having a surface color of a Hunter b value in a range of −5 to 10 and a Hunter L value in a range of 90 to 100, and having a cross-linking absorption property index (CPI) in a range of 1 to 100, the CPI defined by the following equations: where GVs is gel volume in saline, Ln (amount of extracted water-soluble polymer) is a logarithm natural of amount of extracted water-soluble polymer; and wherein the particle-shaped water absorbing agent further contains one or more of components (i) to (iii): (i) an N-oxyl compound in a range of 0.01 to 10 ppm by weight; and a methoxyphenol compound in a range of 0 to 20 ppm by weight; (ii) a methoxyphenol compound in a range of 0.01 to 20 ppm by weight; and a manganese compound in a range of 0.01 to 10 ppm by weight (as MnO (iii) a polyalkyleneglycol of weight average molecular weight of 300 to 50000; and iron in a range of iron content in a range of 0.001 to 5 ppm by weight.