Water-absorbing resin and water-blocking material
AssigneeSumitomo Seika Chemicals Co., Ltd.
InventorMaoki HAMA
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Abstract
Provided are: a water-absorbent resin that has excellent heat resistance, even in a water-absorbed state; and a water-blocking material comprising the water-absorbent resin. The water-absorbent resin according to the present invention includes a crosslinked polymer of a water-soluble ethylenically unsaturated monomer, and has a gel-viscosity retention S of 0.5 or more as calculated by the following formula (I): Gel-viscosity retention at high temperature S=B/A (I) (wherein A represents an initial gel viscosity (mPa·s), and B represents a gel viscosity (mPa·s) after 10 days).
Claims3
A water-absorbent resin comprising a crosslinked polymer of a water-soluble ethylenically unsaturated monomer,
- the water-absorbent resin having a gel viscosity retention S of 0.5 or more as calculated by the following formula (I):
- Gel
-
-
- viscosity
-
-
- retention
-
-
- at
-
-
- high
-
-
- temperature
-
-
- S
- =
- B
-
- /
-
- A
- (
- I
- )
- wherein A represents an initial gel viscosity (mPa·s);
- and
- B represents a gel viscosity (mPa·s) after 10 days.
Dependencies are inferred from the claim text.