Process for the preparation of water absorptive resin

Details Process for the preparation of water absorptive resin Process for the preparation of water absorptive resin

Filed on

1989-06-22

Date issued

1991-10-22

Examiner

Teskin, Fred

Patent Class

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

SubClass

Synthetic resins

SubSubClass

Polymers from only ethylenic monomers or processes of...

Other Related Categories

526 67, 526229, 526235, 526913, 526915, 522182, 522184, C08F 234

Type

Patent

Status

active

Patent number

050596640

Description

ABSTRACT:
A process for the preparation of water absorptive resins which comprises supplying a solution containing at least 20% by weight of a water soluble ethylenically unsaturated monomer as a main component to a polymerization vessel accommodating a vapor phase comprising steam or a mixture of steam with at least one gas substantially inert with respect to polymerization, and polymerizing the monomer in the vapor phase under the relative humidity conditions in the vapor phase of 30% or more.

REFERENCES:
patent: 4267103 (1981-05-01), Cohen
patent: 4351922 (1982-09-01), Yoshida et al.

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