METHOD FOR PRODUCTION OF MODIFIED WATER ABSORBENT RESIN
First Claim
Patent Images
1. A method for the production of a modified water absorbent resin, which comprises:
- a) mixing a water absorbent resin and a water-soluble radical polymerization initiator without addition of an ethylenically unsaturated monomer andb) irradiating the resultant mixture with active energy rays.
1 Assignment
0 Petitions
Accused Products
Abstract
This invention is to provide a method for producing a modified water absorbent resin excelling in water absorbing properties. This invention relates to a method for producing a modified water absorbent resin, which comprises a) mixing a water absorbent resin and a water-soluble radical polymerization initiator or a heat-degradable radical polymerization initiator without addition of an ethylenically unsaturated monomer and b) irradiating the resultant mixture with active energy rays. The method is particularly capable of exalting the absorbency against pressure and the saline flow conductivity.
-
Citations
25 Claims
-
1. A method for the production of a modified water absorbent resin, which comprises:
-
a) mixing a water absorbent resin and a water-soluble radical polymerization initiator without addition of an ethylenically unsaturated monomer and b) irradiating the resultant mixture with active energy rays. - View Dependent Claims (2, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
3. A method for the production of a modified water absorbent resin, which comprises:
-
a) mixing a water absorbent resin and a heat-degradable radical polymerization initiator without addition of an ethylenically unsaturated monomer and b) irradiating the resultant mixture with active energy rays. - View Dependent Claims (4)
-
-
20. A powdery modified water absorbent resin to be obtained by polymerizing monomer components including as a main component acrylic acid (salt), characterized by having
(i) saline flow conductivity of not less than 40 (10− - 7·
cm3·
s·
g−
1),(ii) a solid content of not more than 95%, and (iii) a residual monomer content of not more than 150 ppm. - View Dependent Claims (21, 22)
- 7·
-
23. A method for the production of a modified water absorbent resin, which comprises:
-
a) mixing a water absorbent resin and a persulfate without addition of an ethylenically unsaturated monomer, b) adding a mixing aid other than water at the same time as or prior to the step a), and c) irradiating the resultant mixture with active energy rays.
-
-
24. A method for the production of a modified water absorbent resin, which comprises:
-
a) mixing a water absorbent resin and a persulfate without addition of an ethylenically unsaturated monomer, and b) irradiating the resultant mixture with active energy rays, wherein said water absorbent resin has an acid group and a neutralization ratio (mol % of the neutralized acid group in the whole acid group) in the range of 50-75 mol %.
-
-
25. A method for the production of a modified water absorbent resin, which comprises:
-
a) mixing a water absorbent resin and a persulfate without addition of an ethylenically unsaturated monomer, b) adding a mixing aid other than water at the same time as or prior to the step a), and c) irradiating the resultant mixture with active energy rays, wherein said water absorbent resin has an acid group and a neutralization ratio (mol % of the neutralized acid group in the whole acid group) in the range of 50-75 mol %.
-
Specification