Superabsorbents and the method(s) of obtaining the same
First Claim
1. Non-composite and composite superabsorbents comprising 3 to 85% of ethylinically unsaturated monomers grafted and cross linked on to a combination of biopolymers or single biopolymer with at least one inorganic filler in a homogeneous polar phase in presence of 0.005 to 6.5% of a chemical initiator or a non chemical initiator and a chemical cross linker,wherein the biopolymer is selected from Sterculia urens, Cochlospermum religiosum, guar gum, tragacanth gum, Acacia gum, cellulose, modified cellulose, modified starch, alginic acid and/or its derivatives, or combinations thereof.
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Abstract
This invention relates to novel non-composite and composite superabsorbents, wherein the dry superabsorbents are xerogels, more particularly the bio-xerogels or the composites, particularly the biocomposites, more particularly the bionanocomposites and the method(s) of obtaining the same characterized by simultaneous in situ grafting and cross linking of ethylinically unsaturated monomers on to a single biopolymer of plant or animal origin, or on combination of different biopolymers or biopolymer(s) or/and clay(s), in a homogeneous polar phase, in the presence of initiator and crosslinker of chemical or non-chemical origin, at a temperature of 40 to 90° C., achieved by conventional or microwave heating, reaction time varying from instantaneous to 48 hours, involving use of alkali, either in situ or post reaction at room or elevated temperatures for achieving superior absorbency, in an inert or ambient reaction environment, to yield a neutral or near neutral product.
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Citations
19 Claims
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1. Non-composite and composite superabsorbents comprising 3 to 85% of ethylinically unsaturated monomers grafted and cross linked on to a combination of biopolymers or single biopolymer with at least one inorganic filler in a homogeneous polar phase in presence of 0.005 to 6.5% of a chemical initiator or a non chemical initiator and a chemical cross linker,
wherein the biopolymer is selected from Sterculia urens, Cochlospermum religiosum, guar gum, tragacanth gum, Acacia gum, cellulose, modified cellulose, modified starch, alginic acid and/or its derivatives, or combinations thereof.
Specification