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Aqueous-liquid and blood-absorbing powdery reticulated polymers, process for producing the same and their use as absorbents in sanitary articles

  • US 5,409,771 A
  • Filed: 12/29/1992
  • Issued: 04/25/1995
  • Est. Priority Date: 06/29/1990
  • Status: Expired due to Term
First Claim
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1. Powdery, water-insoluble, cross-linked polymerized resinous particles capable of absorbing aqueous or serous liquids or water, produced by polymerizing a composition comprising by weight(a) 55 to 99.9% of an unsaturated polymerizable monomer containing acid groups, at least 25 mol % of the acid groups being neutralized,(b) 0 to 40% of polymerizable unsaturated monomers other than (a),(c) 0.1 to 5% of a cross-linking agent, and(d) 0 to 30% of a water-soluble polymer, to form water-insoluble resinous particles, coating the particles with 0.1 to 5% their weight on an anhydrous basis of an alkylene carbonate, and heating the coated particles to a temperature of 150°

  • to 300°

    C.

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