Particulate, absorbent, polymeric compositions containing interparticle crosslinked aggregates
First Claim
1. A particulate, absorbent, polymeric composition comprising interparticle crosslinked aggregates, said interparticle crosslinked aggregates comprising (i) precursor particles of substantially water-insoluble, absorbent, hydrogel-forming, polymer material, and (ii) an interparticle crosslinking agent reacted with said polymer material of said precursor particles to form covalent crosslink bonds between said precursor particles, said interparticle crosslinked aggregates being present in the polymeric composition in an amount such that the polymeric composition has a mass average particle size at least about 25% greater than the mass average particle size of said precursor particles.
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Abstract
Particulate, absorbent, polymeric compositions comprising interparticle crosslinked aggregates. The interparticle crosslinked aggregates comprise precursor particles of substantially water-insoluble, absorbent, hydrogel-forming, polymer material; and an interparticle crosslinking agent reacted with the polymer material of the precursor particles to form crosslink bonds between the precursor particles. Sufficient interparticle crosslinked aggregates are formed when the mass average particle size of the resultant polymeric composition has been increased by at least about 25% over the mass average particle size of the precursor particles. The resultant polymeric composition provides improved structural integrity, an increased acquisition rate, and minimal gel blocking properties.
144 Citations
29 Claims
- 1. A particulate, absorbent, polymeric composition comprising interparticle crosslinked aggregates, said interparticle crosslinked aggregates comprising (i) precursor particles of substantially water-insoluble, absorbent, hydrogel-forming, polymer material, and (ii) an interparticle crosslinking agent reacted with said polymer material of said precursor particles to form covalent crosslink bonds between said precursor particles, said interparticle crosslinked aggregates being present in the polymeric composition in an amount such that the polymeric composition has a mass average particle size at least about 25% greater than the mass average particle size of said precursor particles.
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9. A particulate, absorbent, polymeric composition comprising interparticle crosslinked aggregates, said interparticle crosslinked aggregates comprising (i) substantially dry precursor particles of substantially water-insoluble, absorbent, hydrogel-forming, polymer material;
- said polymer material being selected from the group consisting of hydrolyzed starch-acrylonitrile graft copolymer, partially neutralized starch-acrylonitrile graft copolymer, starch-acrylic acid graft copolymer, partially neutralized starch-acrylic acid graft copolymer, saponified vinyl acetate-acrylic ester copolymers, hydrolyzed acrylonitrile or acrylamide copolymers, slightly network crosslinked products of any of the foregoing copolymers, partially neutralized polyacrylic acid, or slightly network crosslinked products of partially neutralized polyacrylic acid; and
(ii) an interparticle crosslinking agent selected from the group consisting of polyhydric alcohol compounds, polyglycidyl ether compounds, polyfunctional aziridine compounds, polyfunctional amine compounds, or polyfunctional isocyanate compounds;
said interparticle crosslinking agent being reacted with said polymer material of said precursor particles to form crosslink bonds between said precursor particles;
said interparticle crosslinked aggregates being present in the polymeric composition in an amount such that the polymeric composition has a mass average particle size at least about 30% greater than the mass average particle size of said precursor particles. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
- said polymer material being selected from the group consisting of hydrolyzed starch-acrylonitrile graft copolymer, partially neutralized starch-acrylonitrile graft copolymer, starch-acrylic acid graft copolymer, partially neutralized starch-acrylic acid graft copolymer, saponified vinyl acetate-acrylic ester copolymers, hydrolyzed acrylonitrile or acrylamide copolymers, slightly network crosslinked products of any of the foregoing copolymers, partially neutralized polyacrylic acid, or slightly network crosslinked products of partially neutralized polyacrylic acid; and
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17. A particulate, absorbent, polymeric composition comprising interparticle crosslinked aggregates, said interparticle crosslinked aggregates comprising (i) substantially dry precursor particles of substantially water-insoluble, absorbent, hydrogel-forming, polymer material;
- said polymer material consisting essentially of slightly network crosslinked products of partially neutralized polyacrylic acid; and
(ii) an interparticle crosslinking agent selected from the group consisting of glycerol;
trimethylol propane;
1,2-propanediol;
1,3-propanediol or ethylene glycol;
said interparticle crosslinking agent being reacted with said polymer material of said precursor particles to form crosslink bonds between said precursor particles;
said interparticle crosslinked aggregates being present in the polymeric composition in an amount such that the polymeric composition has a mass average particle size at least about 30% greater than %he mass average particle size of said precursor particles. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
- said polymer material consisting essentially of slightly network crosslinked products of partially neutralized polyacrylic acid; and
Specification