| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a water-absorbing resin in which too much purification process is not needed even if acrylic acid is biomass origin, which is a water-absorbing resin excessively consumed by a paper diaper or the like, and is water-absorbing resin which is gentle to earth environment and in which regenerating is possible, and in which whiteness is high, and coloring is little with the passage of time. <P>SOLUTION: The polyacrylic acid (salt) based water-absorbing resin is a polyacrylic acid (salt) based water-absorbing resin which has an internal cross linkage structure obtained by carrying out polymerization of a water-soluble unsaturated monomer, and is characterized in that a carbon stable isotope ratio (δ<SP POS="POST">13</SP>C) measured by an accelerator mass spectrometry is at least -20 per mill. <P>COPYRIGHT: (C)2012,JPO&INPIT |
