Method for treating the surface of an absorbent resin

Details Method for treating the surface of an absorbent resin Method for treating the surface of an absorbent resin

1990-04-02

1992-11-17

Lipman, Bernard

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

5253295, 5253296, 5253301, C08F 814

Patent

active

051644592

ABSTRACT:
A method for treating the surface of an absorbent resin which comprises mixing (I) 100 parts by weight of an absorbent resin powder having a carboxyl group, (II) 0.01 to 30 parts by weight of a polyhydric alcohol, (III) 0 to 50 parts by weight of water and (IV) 0 to 60 parts by weight of a hydrophilic organic solvent, and heat-treating at a temperature in the range of 90.degree. to 250.degree. C. to treat the surface of said absorbent resin powder (I) until the reaction of said absorbent resin powder (I) with said polyhydric alcohol (II) is completed, wherein the time for completion of the reaction is the time that satisfies the following equation (a-1):

REFERENCES:
patent: 3661815 (1972-05-01), Smith
patent: 4076663 (1978-02-01), Masuda
patent: 4497930 (1985-02-01), Yamasaki
patent: 4587308 (1986-05-01), Makita
patent: 4666983 (1987-05-01), Tsubakimoto
patent: 4734478 (1988-03-01), Tsubakimoto

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