Process to produce water absorbent polymers

Details Process to produce water absorbent polymers Process to produce water absorbent polymers

1987-11-06

1988-10-11

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526273, 526295, 5263171, 526930, C08F 200

Patent

active

047772310

ABSTRACT:
A water-in-oil suspension polymerization process of the type comprising a process for preparing a water-insoluble polymer capable of absorbing water, aqueous salt solutions and blood, which utilizes as the suspending agent a cellulose ester or ether protective colloid, the improvement which comprises using as the protective colloid an oil-soluble, water-insoluble, polymeric surfactant instead of the cellulose derivatives, in an amount sufficient to stabilize the emulsion, said polymeric surfactant having the formula: ##STR1## wherein x is a whole number greater than about 5, the mole ratio of a:b is from 3:1 to 1:3, provided the HLB number is maintained at less than about 14, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently selected from the group consisting of hydrogen, alkyl (C.sub.1-16), aryl (C.sub.6-12), alkaryl (C.sub.7-12), and R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are such that the surfactant is oil-soluble and water-insoluble.

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patent: 4339371 (1982-07-01), Robinson et al.
patent: 4367323 (1983-01-01), Kitamura et al.
patent: 4446261 (1984-05-01), Yamasaki et al.
patent: 4465803 (1984-08-01), Nakayama

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