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1. (WO1998051408) HYDROGEL COMPOSITES AND SUPERPOROUS HYDROGEL COMPOSITES HAVING FAST SWELLING, HIGH MECHANICAL STRENGHT, AND SUPERABSORBENT PROPERTIES
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1998/051408 International Application No.: PCT/IB1998/000686
Publication Date: 19.11.1998 International Filing Date: 08.05.1998
Chapter 2 Demand Filed: 02.12.1998
IPC:
A61L 15/60 (2006.01) ,C08F 251/00 (2006.01) ,C08F 291/00 (2006.01)
A HUMAN NECESSITIES
61
MEDICAL OR VETERINARY SCIENCE; HYGIENE
L
METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION, OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICAL ARTICLES
15
Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
16
Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
42
Use of materials characterised by their function or physical properties
60
Liquid-swellable gel-forming materials, e.g. super-absorbents
C CHEMISTRY; METALLURGY
08
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
F
MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
251
Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
C CHEMISTRY; METALLURGY
08
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
F
MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
291
Macromolecular compounds obtained by polymerising monomers on to macromolecular compounds according to more than one of the groups C08F251/-C08F289/183
Applicants:
PURDUE RESEARCH FOUNDATION [US/US]; 1063 Hovde Hall Purdue University West Lafayette, IN 47907, US
Inventors:
PARK, Kinam; US
CHEN, Jun; US
PARK, Haesun; US
Agent:
PRICE, Robert, L.; McDermott, Will & Emery Suite 300 99 Canal Center Plaza Alexandria, VA 22314, US
Priority Data:
08/855,49913.05.1997US
Title (EN) HYDROGEL COMPOSITES AND SUPERPOROUS HYDROGEL COMPOSITES HAVING FAST SWELLING, HIGH MECHANICAL STRENGHT, AND SUPERABSORBENT PROPERTIES
(FR) COMPOSITES D'HYDROGEL ET COMPOSITES D'HYDROGEL SUPERPOREUX AVEC ACTION GONFLANTE RAPIDE, RESISTANCE MECANIQUE ELEVEE ET PROPRIETES SUPERABSORBANTES
Abstract:
(EN) A superporous hydrogel composite is formed by polymerizing one or more ethylenically-unsaturated monomers, and a multiolefinic cross-linking agent, in the presence of particles of a disintegrant and a blowing agent. The disintegrant, which rapidly absorbs water, serves to greatly increase the mechanical strength of the superporous hydrogel and significantly shortens the time required to absorb water and swell. Superporous hydrogel composites prepared by this method have an average pore size in the range of 10 $g(m)m to 3,000 $g(m)m. Preferred particles of disintegrant include natural and synthetic charged polymers, such as cross-linked sodium carboxymethylcellulose, cross-linked sodium starch glycolate, and cross-linked polyvinylpyrrolidone. The blowing agent is preferably a compound that releases gas bubbles upon acidification, such as NaHCO3. Improved hydrogel composites formed without a blowing agent are also provided.
(FR) On forme un composite d'hydrogel surperporeux en polymérisant un ou plusieurs monomères éthyléniquement insaturés, et un agent de réticulation multioléfinique, en présence de particules d'un désintégrant et d'un agent gonflant. Le désintégrant qui absorbe rapidement l'eau, sert à augmenter de manière importante la résistance mécanique de l'hydrogel superporeux et à réduire de façon significative le temps requis par l'hydrogel pour absorber l'eau et pour gonfler. Les composites d'hydrogel superporeux préparés à l'aide de ce procédé ont une granulométrie moyenne comprise entre 10 $g(m)m et 3000 $g(m)m. Les particules de désintégrant préférées contiennent des polymères chargés naturels et synthétiques, tels que de la carboxyméthylcellulose de sodium réticulée, du glycolate d'amidon de sodium réticulé et de la polyvinylpyrrolidone réticulée. L'agent gonflant est de préférence constitué par un composé qui libère des bulles de gaz après acidification, tel que du NaHCO3. Des composites d'hydrogel améliorés formés sans agent gonflant sont également présentés.
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Designated States: AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CZ, DE, DK, EE, ES, FI, GB, GE, GH, GM, GW, HU, ID, IL, IS, JP, KE, KG, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, UA, UG, UZ, VN, YU, ZW
African Regional Intellectual Property Organization (ARIPO) (GH, GM, KE, LS, MW, SD, SZ, UG, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0988108JP2002501563 CN1264321CA2289756AU1998069326AU2001085541