Superabsorbent polymers having anti-caking characteristics
First Claim
1. A particulate material composition comprising an inorganic powder intermixed with particles of superabsorbent polymer, said polymer particles being of such size that less than about 60% of said polymer particles, by weight, will pass through a U.S. Standard 50 mesh sieve with 300 micrometer openings, and wherein the composition exhibits anti-caking characteristics in that more than about 90% of the composition particles, by weight, will pass through a U.S. Standard 12 mesh sieve with 1700 micrometer openings after at least about 3 hours at about 36±
- 3°
C. and about 77±
3% relative humidity.
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Accused Products
Abstract
A particulate material composition of superabsorbent polymer particles, wherein less than about 60% by weight of the superabsorbent polymer particles will pass through a U.S. Standard 50 mesh sieve. The composition has anti-caking properties and also reduced dusting. The composition can be produced by mixing the superabsorbent polymer particles with an inorganic powder, such as clay.
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Citations
67 Claims
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1. A particulate material composition comprising an inorganic powder intermixed with particles of superabsorbent polymer, said polymer particles being of such size that less than about 60% of said polymer particles, by weight, will pass through a U.S. Standard 50 mesh sieve with 300 micrometer openings, and wherein the composition exhibits anti-caking characteristics in that more than about 90% of the composition particles, by weight, will pass through a U.S. Standard 12 mesh sieve with 1700 micrometer openings after at least about 3 hours at about 36±
- 3°
C. and about 77±
3% relative humidity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
- 3°
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18. An absorbent article comprising a particulate material composition of an inorganic powder intermixed with particles of superabsorbent polymer, said polymer particles being of such size that less than about 60% of said polymer particles, by weight, will pass through a U.S. Standard 50 mesh sieve with 300 micrometer openings, and wherein the particulate material composition, prior to incorporation into the article, exhibits anti-caking characteristics in that more than about 90% of the composition particles, by weight, will pass through a U.S. Standard 12 mesh sieve with 1700 micrometer openings after at least about 3 hours at about 36±
- 3°
C. and about 77±
3% relative humidity. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A method for providing anti-caking characteristics to particles of superabsorbent polymer, said method comprising:
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(A) providing superabsorbent polymer particles of such size that less than about 60% of the polymer particles, by weight, will pass through a U.S. Standard 50 mesh sieve with 300 micrometer openings; (B) mixing an inorganic powder with the polymer particles in an amount of between about 0.2% to about 10% by weight of the polymer particles, to create a particulate material composition; and (C) achieving anti-caking characteristics in that more than about 90% of the composition particles, by weight, will pass through a U.S. Standard 12 mesh sieve with 1700 micrometer openings after at least about 3 hours at about 36±
3°
C. and about 77±
3% relative humidity. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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51. A method for providing anti-caking characteristics to a particulate material composition in an absorbent article, said method comprising:
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(A) providing superabsorbent polymer particles of such size that less than about 60% of the polymer particles, by weight, will pass through a U.S. Standard 50 mesh sieve with 300 micrometer openings; (B) mixing an inorganic powder with the polymer particles in an amount of between about 0.2% to about 10% by weight of the polymer particles, to create the particulate material composition; (C) achieving anti-caking characteristics in that more than about 90% of the composition particles, by weight, will pass through a U.S. Standard 12 mesh sieve with 1700 micrometer openings after at least about 3 hours at about 36±
3°
C. and about 77±
3% relative humidity; and(D) forming an absorbent article from the particulate material composition of step (C). - View Dependent Claims (52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67)
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Specification