Superabsorbent polymer having improved absorption rate and absor

Details Superabsorbent polymer having improved absorption rate and absor Superabsorbent polymer having improved absorption rate and absor

1993-09-17

1994-05-24

Foelak, Morton

Surgery

Means and methods for collecting body fluids or waste material

Absorbent pad for external or internal application and...

210691, 210692, 521 64, 521 72, 521 92, 521149, 604367, A61F 1315, A61F 1320

Patent

active

053144201

ABSTRACT:
A superabsorbent polymer having improved absorption under pressure and fast absorption rate is obtained by first providing a solution containing carboxylic acid monomers or water soluble salts thereof, and a crosslinking agent. A carbonate blowing agent and a polymerization initiator are added, individually or in combination, to the solution to form a carbonated monomer solution. A polymerization initiator is then added to the carbonated monomer solution which is then polymerized at temperatures ranging from about 0.degree. C. to about 130.degree. C., forming a microcellular hydrogel. The microcellular hydrogel is chopped or ground into gel pieces having a particle diameter ranging from about 0.1 mm to about 5.0 cm. The gel pieces are dried at temperatures ranging from about 85.degree. C. to about 210.degree. C., and are then ground to form a polymer having a particle size of from about 0.05 mm to about 5.0 mm. A mixture is formed from 100 parts by weight of the polymer and about 0.001 to about 30 parts by weight of a surface crosslinking agent. The polymer is reacted with the surface crosslinking agent to crosslink molecular chains existing on a surface of the polymer, forming the superabsorbent polymer.

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patent: 5118719 (1992-06-01), Lind
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patent: 5145906 (1992-09-01), Chambers et al.
patent: 5154713 (1992-10-01), Lind
patent: 5229466 (1993-07-01), Brehm et al.

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