WO1996004024B1 - High performance superabsorbent material and absorbent devices containing the same - Google Patents
High performance superabsorbent material and absorbent devices containing the sameInfo
- Publication number
- WO1996004024B1 WO1996004024B1 PCT/US1995/008578 US9508578W WO9604024B1 WO 1996004024 B1 WO1996004024 B1 WO 1996004024B1 US 9508578 W US9508578 W US 9508578W WO 9604024 B1 WO9604024 B1 WO 9604024B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- absorbent
- particles
- microns
- forming polymer
- individual
- Prior art date
Links
Abstract
A high performance absorbent particulate composition and a method of preparation in which a non-colloidal solid filler core is substantially encapsulated within a layer of hydrogel forming polymer is disclosed. Also disclosed are absorbent devices using the high performance absorbent particulate composition and methods of making these devices.
Claims
1. A plurality of individual and discrete absorbent particles wherein each particle comprises one non-colloidal water resistant solid core particle substantially encapsulated by a composition consisting essentially of a hydrogel forming polymer wherein the plurality of individual and discrete absorbent particles are in the substantial absence of absorbent particles containing none or more than one solid core particle.
2. The plurality of individual and discrete absorbent particles of claim 1, wherein the non-colloidal water resistant solid core particle is an inorganic mineral.
3. The plurality of individual and discrete absorbent particles of claim 2, wherein the inorganic mineral is selected from the group consisting of silicon dioxide, titanium dioxide, magnesium oxide, antimony oxide, clay, talc, wollastonite, synthetic amorphous silica, and calcium carbonate.
4. The plurality of individual and discrete absorbent particles of claim 1, wherein the solid core particle is a particle with a size of from about 10 microns to about
1500 microns.
5. The plurality of individual and discrete absorbent particles of claim 1, wherein said absorbent particle has a weight ratio of the solid core particle to hydrogel forming polymer of from about 1:4 to about 9:1.
6. The plurality of individual and discrete absorbent particles of claim 1, wherein said absorbent particle has an average particle size in the range of from about 30 microns to about 2000 microns. -66-
7. The plurality of individual and discrete absorbent particles of claim 1, wherein the solid core particle is a cereal, starch, cellulose, or gelatin in particulate form.
8. The plurality of individual and discrete absorbent particles of claim 1, wherein at least two absorbent particles are attached through interparticle surface bonding into aggregates with an average particle size of from about 30 to about 1500 microns.
-67-
9. The plurality of individual and discrete absorbent particles of claim 1, wherein said hydrogel forming polymer is selected from the group consisting of polyacrylic acid, polymethacrylic acid, polymaleic acid and copolymers thereof, and their alkali metal salts; polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl alkylether, polyethylene oxide, polyacrylamide and copolymers thereof; saponfied starch graft copolymers of acrylonitrile, acrylate esters, vinyl acetate; starch graft copolymers of acrylic acid, methacrylic acid, and maleic acid; and copolymers of maleic anhydride and alkyl vinyl ethers.
10. The plurality of individual and discrete absorbent particles of claim 9, wherein the hydrogel polymer is cross-linked with a polyfunctional epoxy, haloepoxy, aldehyde, amine, imine, or isocyanate compound or by a polyfunctional ethylenically unsaturated compound.
11. A method for preparing the absorbent particles of claim 1, comprising the steps of: a) individually suspending non-colloidal water resistant solid particles in a water immiscible solvent in the presence of a surface active agent; b) suspending in said water immiscible solvent an aqueous solution of an ethylenically unsaturated monomer capable of polymerization into a hydrogel forming polymer and an initiator; c) polymerizing said monomer such that said non-colloidal water resistant solid particles are individually and substantially encapsulated by said hydrogel forming polymer to form absorbent particles; and d) separating and drying said absorbent particles.
12. The method of claim 11, wherein said polymer is cross-linked a with polyfunctional cross-linking agent which is included in the aqueous solution in step (b) . -68-
13. The method of claim 11, wherein the aqueous solution further comprises a polyfunctional cross-linking agent .
14. The method of claim 11, wherein said polymer is cross-linked with a polyfunctional cross-linking agent which is added at the end of step (c) and prior to step (d) .
15. The method of claim 11, wherein said absorbent particles in step (d) are cross-linked by suspending said absorbent particles in a solvent containing a polyfunctional cross-linking agent.
16. An absorbent device comprising hydrophilic fibers and a plurality of individual and discrete absorbent particles according to claim 1.
17. The absorbent device of claim 16, further comprising superabsorbent particles consisting of hydrogel forming polymer.
18. The absorbent device of claim 16, wherein each absorbent particle has a weight ratio of said solid core to hydrogel forming polymer of from about 1:4 to about 9:1.
19. The absorbent device of claim 17, in which said superabsorbent particles consisting of hydrogel forming polymer and said plurality of individual and discrete absorbent particles of the absorbent composition of claim 1 are present in a weight ratio of from about 1:9 to about 9 : 1
20. The absorbent device of claim 16, in which said fibers and said plurality of individual and discrete absorbent particles are present in a weight ratio of from about 95:5 to about 2:3. -69-
21. The absorbent device of claim 19, in which said fibers and said plurality of individual and discrete absorbent particles are present in a weight ratio of from about 95:5 to about 2:3.
-70-
22. An absorbent article comprising a fluid-permeable topsheet material adjacent at least one layer of hydrophilic fibers and a plurality of individual and discrete absorbent particles of claim 1, and a liquid-impermeable backing material adjacent said layer and opposite said fluid-permeable topsheet material.
23. The absorbent article of claim 22, wherein said article is a diaper.
24. The absorbent article of claim 22, wherein said article is a sanitary napkin.
25. An absorbent article comprising at least one volumetric zone comprising hydrophilic fibers and particles comprising non-colloidal water resistant solid cores substantially encapsulated by a hydrogel forming polymer.
26. The absorbent article of claim 25, wherein said at least one volumetric zone occupies at least 2% by dry state volume of said device.
27. The absorbent device of claim 25, in which each volumetric zone further comprises superabsorbent particles consisting of hydrogel forming polymer.
28. The absorbent article of claim 25, further comprising a fluid-permeable topsheet material adjacent said volumetric zone and a liquid impermeable backsheet material adjacent said volumetric zone and opposite said fluid-permeable facing material.
29. The absorbent article of claim 28, wherein said article is a diaper.
30. The absorbent article of claim 28, wherein said article is a sanitary napkin.
31. The particles of claim 1, wherein said hydrogel forming polymer has a coating thickness of from about 2 μ to about 3000 μ.
32. The particles of claim 31, wherein said coating thickness is from about 10 μ to about 300 μ.
33. The particles of claim 1, wherein said hydrogel forming polymer has a number average molecular weight of at least about 250,000.
34. The particles of claim 1, wherein said hydrogel forming polymer has an outer surface that is chemically crosslinked.
35. The particles of claim 1, wherein said hydrogel forming polymer is crosslinked.
36. The particles of claim 35, wherein said hydrogel forming polymer has an outer surface forming a shell and an interior region and wherein said shell has a higher crosslink density than said interior region.
37. The particles of claim 1, wherein said solid core is a hollow, mineral sphere.
38. A method of making the plurality of absorbent particles of claim 1, having a particle size of DAp comprising the steps:
(a) individually suspending non-colloidal water resistant solid particles having a particle size D^p in a -72-
water immiscible solvent in the presence of a surface active agent;
(b) suspending in said water immiscible solvent an aqueous solution of an ethylenically unsaturated monomer capable of polymerization into a hydrogel forming polymer and an initiator;
(c) polymerizing said monomer such that said non-colloidal water resistant solid particles are individually and substantially encapsulated to a thickness T by said hydrogel forming polymer to form said absorbent particles having a particle size D-_, wherein D _ has a value in the range of about 30 microns to about 2000 microns, D has a value in the range of about 10 microns to about 150 microns, and T has a value in the range of about 10 microns to about 995 microns.
39. The method of claim 38, wherein said polymer is crosslinked with a polyfunctional crosslinking agent which are included in the aqueous solution in step (b) .
40. The method of claim 39, wherein the aqueous solution further comprises said polyfunctional crosslinking agent .
41. The method of claim 38, wherein said surface active agent has an HLB factor of from about 2 to about 12.
42. The method of claim 41, wherein said surface active agent has an HLB value of from about 3 to about 7.
43. The method of claim 42, wherein said surface active agent has an HLB value of from about 3 to about 5.
44. The method of claim 38, wherein said surface active agent is SPAN 60® or TWEEN 81®. -73-
45. The method of claim 38, wherein said surface active agent is a fatty ester of a sugar optionally reacted with ethylene oxide.
46. The method of claim 38, wherein said water immiscible solvent is cyclohexane.
47. The method of claim 38, wherein said ethylenically unsaturated monomer is acrylic acid.
48. The method of claim 38, wherein said ethylenically unsaturated monomer is a partially neutralized acrylate-acrylic acid mixture.
49. The method of claim 38, wherein said initiator is potassium persulfate.
50. An absorbent device comprising fibers and a plurality of absorbent particles of claim 1.
51. The absorbent device of claim 50, wherein said absorbent particles are dispersed among the fibers.
52. The absorbent device of claim 50, wherein said absorbent particles are positioned between two layers of fibers.
53. The absorbent device of claim 50, wherein said fibers are present in the form of a web.
54. The absorbent device of claim 53, wherein said fibers comprise cellulose pulp and wherein said web is collected on a forming screen.
55. The absorbent device of claim 50, wherein said absorbent particles comprise about 20 to about 70% by weight of said non-colloidal solid core and wherein said solid core -74-
is a particulate material with a particle size of from about 10 microns to about 1500 microns.
56. The absorbent device of claim 55, wherein said solid core is an inorganic mineral in particulate form.
57. The absorbent device of claim 56, wherein said solid core is silicon dioxide, titanium dioxide, magnesium oxide, antimony oxide, clay, talc, wollastonite, synthetic amorphous silica, or calcium carbonate.
58. The absorbent device of claim 50, wherein said solid core is a hollow mineral sphere.
59. The absorbent device of claim 50, wherein said fibers are hydrophilic.
60. The absorbent device of claim 50, wherein said fibers are textile fibers.
61. The absorbent device of claim 55, wherein said solid core is cereal, wood flour, ground nut shells, cellulose, or gelatin in particulate form.
62. The absorbent device of claim 50, wherein said solid core is starch in particulate form.
63. An absorbent device comprising:
(a) a fibrous web of bonded or unbonded hydrophilic fibers; and
(b) a plurality of absorbent particles of claim 1 interspersed within said web, wherein said solid core is an inorganic mineral in particulate form having a particle size in the range of from about 10 microns to about 1500 microns, and wherein said absorbent particles comprise 20-70% by weight of said solid core. -75-
64. The absorbent device of claim 50, wherein said device is a disposable diaper.
65. The absorbent device of claim 50, wherein said device is a female sanitary napkin.
66. The absorbent device of claim 50, wherein said device is a urinary incontinence pad.
67. The absorbent device of claim 50, wherein said device is a bed pad.
68. The absorbent device of claim 50, wherein said device is a pad for absorbing fluids from food.
69. The absorbent device of claim 50, wherein said device is a bandage.
70. A process for manufacturing an absorbent device comprising:
(a) dispersing absorbent particles of claim 1 into an absorbent core comprising fibers;
(b) interposing said absorbent core between a liquid pervious topsheet and a liquid impervious backsheet such that an outer edge of said topsheet and said backsheet are in contact with each other; and
(c) sealing said edges together to create a liquid barrier containing said absorbent core.
71. The absorbent particles of claim 1, wherein said solid core particle is silica and wherein said polymer comprises a partially neutralized, crosslinked polyacrylic acid; and wherein the weight ratio of silica to polymer is in the range of from about 1.0:1.5 to about 1.5:1.0 per absorbent particle. -76-
72. The absorbent particles of claim 71, wherein said particle of silica has a particle size of from about
50 microns to about 1000 microns.
73. The absorbent particles of claim 72, wherein said particle size is from about 75 microns to about 500 microns.
74. The absorbent particles of claim 71, wherein said hydrogel forming polymer has a thickness of from about
40 microns to about 150 microns.
75. A mixture of particles consisting essentially of the plurality of individual and discrete absorbent particles of claim 1 and superabsorbent particles consisting of hydrogel forming polymer.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| MX9700779A MX9700779A (en) | 1994-08-01 | 1995-07-07 | High performance superabsorbent material and absorbent devices containing the same. |
| BR9508490A BR9508490A (en) | 1994-08-01 | 1995-07-07 | Absorbent particle absorbent device absorbent article plurality of discrete and individual absorbent particles and the respective manufacturing processes |
| CA002172847A CA2172847C (en) | 1994-08-01 | 1995-07-07 | High performance superabsorbent material and absorbent devices containing the same |
| AU29663/95A AU2966395A (en) | 1994-08-01 | 1995-07-07 | High performance superabsorbent material and absorbent devices containing the same |
| JP8506504A JP2979047B2 (en) | 1994-08-01 | 1995-07-07 | High-performance high-absorbency material and absorbent article containing it |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/283,559 US5549590A (en) | 1994-08-01 | 1994-08-01 | High performance absorbent particles and methods of preparation |
| US08/283,559 | 1994-08-01 | ||
| US46062395A | 1995-06-02 | 1995-06-02 | |
| US08/460,623 | 1995-06-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1996004024A1 WO1996004024A1 (en) | 1996-02-15 |
| WO1996004024B1 true WO1996004024B1 (en) | 1996-03-21 |
Family
ID=26962111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1995/008578 WO1996004024A1 (en) | 1994-08-01 | 1995-07-07 | High performance superabsorbent material and absorbent devices containing the same |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0697217A1 (en) |
| JP (1) | JP2979047B2 (en) |
| AU (1) | AU2966395A (en) |
| BR (1) | BR9508490A (en) |
| IL (1) | IL114709A (en) |
| MX (1) | MX9700779A (en) |
| WO (1) | WO1996004024A1 (en) |
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| US6437214B1 (en) | 2000-01-06 | 2002-08-20 | Kimberly-Clark Worldwide, Inc. | Layered absorbent structure with a zoned basis weight and a heterogeneous layer region |
| JP2002302182A (en) * | 2001-02-05 | 2002-10-15 | Uni Charm Corp | Drip absorbing mat |
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| US20070093766A1 (en) * | 2003-06-13 | 2007-04-26 | Sumitomo Seika Chemicals Co., Ltd. | Absorbing material and absorptive article using the same |
| JP4426787B2 (en) * | 2003-07-24 | 2010-03-03 | ユニ・チャーム株式会社 | Disposable body fluid treatment supplies |
| MXPA06001295A (en) * | 2003-08-06 | 2006-04-11 | Procter & Gamble | Absorbent article comprising coated water-swellable material. |
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1995
- 1995-07-07 WO PCT/US1995/008578 patent/WO1996004024A1/en active Search and Examination
- 1995-07-07 BR BR9508490A patent/BR9508490A/en not_active Application Discontinuation
- 1995-07-07 AU AU29663/95A patent/AU2966395A/en not_active Abandoned
- 1995-07-07 MX MX9700779A patent/MX9700779A/en not_active IP Right Cessation
- 1995-07-07 JP JP8506504A patent/JP2979047B2/en not_active Expired - Lifetime
- 1995-07-24 IL IL11470995A patent/IL114709A/en not_active IP Right Cessation
- 1995-07-25 EP EP95111658A patent/EP0697217A1/en not_active Withdrawn
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