Method for preparing highly absorbent hydro-gel polymers

Details Method for preparing highly absorbent hydro-gel polymers Method for preparing highly absorbent hydro-gel polymers

Filed on

1980-06-18

Date issued

1982-03-16

Examiner

Seccuro, Carman J.

Patent Class

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

SubClass

Synthetic resins

SubSubClass

At least one aryl ring which is part of a fused or bridged...

Other Related Categories

525 59, 524916, C08L 2904, C08L 3302

Type

Patent

Status

active

Patent number

043200400

Description

ABSTRACT:
A method for producing a hydrophilic gel comprising polymerizing acrylic acid and/or methacrylic acid in the presence of polyvinyl alcohol to obtain a polymer (A) which is then subjected to neutralization followed by heat treatment or to heat treatment followed by neutralization, or polymerizing a neutralized product of acrylic acid and/or methacrylic acid in the presence of polyvinyl alcohol to obtain a polymer (B) which is then subjected to heat treatment, wherein said polymerization is carried out in an aqueous solution having a total concentration of acrylic acid and/or methacrylic acid or its neutralized product (the weight of the neutralized product is converted to the acid basis) and polyvinyl alcohol of 10 to 60% by weight, said heat treatment temperature is 50.degree. to 150.degree. C., and the weight ratio of polyvinylalcohol is acrylic acid and/or methacrylic acid or its salt (the weight of the neutralized product is converted to the acid basis) is 5 to 95: 95 to 5.

REFERENCES:
patent: 3272749 (1966-09-01), Martin
patent: 3935099 (1976-01-01), Weaver et al.
patent: 4102842 (1978-07-01), Fujimoto et al.
patent: 4124748 (1978-11-01), Fujimoto et al.

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