Superabsorbent polymers and products containing them
AssigneeAllied Colloids Limited
InventorsIan Michael Johnson, Pauline Lesley Couldwell
Life of this patent
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Abstract
Particulate superabsorbent polymeric material which is a partially neutralised polymer of an ethylenically unsaturated carboxylic monomer cross linked by a triethylenic or higher ethylenic cross linking agent, preferably tetra allyl ammonium chloride, absorbs above 15 grams, and often above 18 grams, aqueous saline per gram polymeric material in 60 minutes under a load of 63,000 dynes per square centimeter. The polymer preferably has surface cross linking caused by contacting the polymer particles with inorganic and/or covalent cross linking agent for the polymer.
Claims21
A superabsorbent polymeric material which is in the form of particles, wherein
- the polymeric material has been obtained by copolymerization of an aqueous mixture of monomers consisting essentially of partially or wholly neutralized acrylic acid and a polyethylenically unsaturated cross linking agent having at least three ethylenically unsaturated bonds which is tetra allyl ammonium chloride, bromide or iodide, and which is soluble in the aqueous mixture;
- and
- the particulate material absorbs above 15 grams aqueous saline per gram polymeric material in 60 minutes under a load of 63,000 dynes per square centimeter.
A superabsorbent polymeric material which is in the form of particles, wherein
- the polymeric material has been obtained by copolymerization of an aqueous mixture of monomers consisting essentially of partially or wholly neutralized acrylic acid and a polyethylenically unsaturated cross linking agent having at least three ethylenically unsaturated bonds which is tetra allyl ammonium chloride, bromide or iodide, and which is soluble in the aqueous mixture, and
- the particulate material absorbs above 15 grams aqueous saline per gram polymeric material in 60 minutes under a load of 63,000 dynes per square centimeter.
A superabsorbent polymeric material which is in the form of particles which absorb above 15 grams aqueous saline per gram polymeric material in 60 minutes under a load of 63,000 dynes per square centimeter product of the process comprising copolymerizing an aqueous mixture of monomers consisting essentially of partially or wholly neutralized acrylic acid and a polyethylenically unsaturated cross-linking agent selected from tetra allyl ammonium chloride, tetra allyl ammonium bromide and tetra allyl ammonium iodide, and which is soluble in the aqueous mixture.
A particulate superabsorbent polymer material copolymerization product of monomers consisting essentially of partially or wholly neutralized acrylic acid and tetra allyl ammonium chloride, bromide or iodide which absorbs about 15 grams aqueous saline per gram in 60 minutes under a load of 63,000 dynes per square centimeter.
Dependencies are inferred from the claim text.