Patent ID: 11931290
Assignee: NIPPON SHOKUBAI CO., LTD.
Field: Medical technology (Instruments)
Classification: CPC A  C | IPC A  B

Claim 0:
1. A water absorbent resin powder for a heat-generating element composition comprising a polyacrylic acid (salt)-based water absorbent resin powder, wherein the polyacrylic acid (salt)-based water absorbent resin powder has
a bulk specific gravity (specified by JIS K3362) of 0.630 g/cm3 or less;
fluid retention capacity without load (CRC) for a 0.9% by weight aqueous solution of sodium chloride (specified by ERT441.01-2) of 32.0 g/g or less;
a weight-average particle diameter (specified by sieve classification) of 250 μm or more;
an amount of a residual glycidyl-based crosslinking agent of 10 ppm or less; and
a percentage of adhesion of 20% or less, wherein the percentage of adhesion is measured by the adhesion amount [g]/total weight [g] of materials used×100% according to Evaluation Test 1.