Superabsorbent polymers

Details Superabsorbent polymers Superabsorbent polymers

1994-08-25

1996-10-08

Nagumo, Mark

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

Synthetic resins

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

525274, 525296, 525385, 525451, 526200, C08F 232

Patent

active

055632181

ABSTRACT:
Superabsorbent, high gel strength/short gel time acrylic polymers, well suited for the production of items of feminine hygiene/adult incontinence, are prepared by (a) inversely suspending an aqueous acrylic monomer phase in an organic solvent in the presence of an emulsifying agent having an HLB of from 8 to 12, the aqueous monomer phase also comprising a crosslinking agent therefor, (b) polymerizing the inverse suspension of acrylic monomer into a polymer gel, (c) absorbing a second charge of acrylic monomer into the polymer gel thus attained, the ratio of the amount of the second monomer charge to the amount of monomer in the beginning aqueous phase ranging from 1 to 1.2, (d) introducing a surfactant having an HLB of from 2 to 5 into the medium of polymerization, and (e) polymerizing the second monomer charge within the polymer gel.

REFERENCES:
patent: 4721647 (1988-01-01), Nakanishi et al.
patent: 5354806 (1991-10-01), Hsieh
patent: 5373066 (1994-12-01), Rebre, Sr. et al.
patent: 5408006 (1995-04-01), Rebre, Sr. et al.

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