Preparation of rapidly dissolving/absorbing powders of hydrophil

Details Preparation of rapidly dissolving/absorbing powders of hydrophil Preparation of rapidly dissolving/absorbing powders of hydrophil

1997-11-14

1999-11-30

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 61, 521 62, 521 63, 526201, 526207, 526213, 526215, C08J 928, C08F 200

Patent

active

059944196

ABSTRACT:
Rapidly dissolving/absorbing free-flowing powders of hydrophilic/superabsorbent (co)polymers, having irregular nonspherical morphology and a particle size distribution ranging from 100 .mu.m to 800 .mu.m, are prepared by (a) phase inversion (co)polymerizing stirred admixture of (i) a hydrocarbonic solution of at least one surfactant having an HBL ranging from 8 to 12 and (ii) an aqueous solution of at least one hydrophilic unsaturated monomer, in the presence of an effective amount of a radical polymerization initiator and at a predetermined temperature of (co)polymerization, (b) next introducing into the medium of (co)polymerization, after (co)polymerization of the at least one hydrophilic unsaturated monomer, a second aqueous solution of at least one hydrophilic unsaturated monomer, (c) then (co)polymerizing the second aqueous solution, and (d) thence extracting the hydrocarbonic phase and water from the resulting (co)polymerizate and drying same, with the proviso (e) that the second aqueous monomer solution is introduced at a temperature of about the predetermined temperature of (co)polymerization and the volumetric ratio of aqueous phase to hydrocarbonic phase ranges from 0.6 to 1.2.

REFERENCES:
patent: 3255127 (1966-06-01), von Bonin et al.
patent: 3256219 (1966-06-01), Will
patent: 3957739 (1976-05-01), Cabestany et al.
patent: 4093776 (1978-06-01), Aoki et al.
patent: 5633291 (1997-05-01), Dryer et al.

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