HYDROGELS BASED ON ESTERIFIED CELLULOSE ETHERS

• Main Authors: CURTIS-FISK, Jaime L, PETERMANN, Oliver, BALWINSKI, Karen M
• Format: Patent
• Language: English; French
• Published: 06.06.2019
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DERIVATIVES THEREOF; FOODS OR FOODSTUFFS; FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BYSUBCLASSES A23B - A23J; GENERAL PROCESSES OF COMPOUNDING; HUMAN NECESSITIES; HYGIENE; MEDICAL OR VETERINARY SCIENCE; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; POLYSACCHARIDES; PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL; THEIR PREPARATION OR CHEMICAL WORKING-UP; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OFNUTRITIVE QUALITIES, PHYSICAL TREATMENT; THEIR TREATMENT, NOT COVERED BY OTHER CLASSES; WORKING-UP

A hydrogel is formed from an esterified cellulose ether and water by heat treatment and syneresis. The hydrogel also comprises an ion exchange resin and a pharmaceutical or nutritional ingredient. The esterified cellulose ether comprises aliphatic monovalent acyl groups and groups of the formula - C(O) - R - COOH, R being a divalent hydrocarbon group, wherein I) the degree of neutralization of the groups - C(O) - R - COOH is not more than 0.4 and II) the total degree of ester substitution is from 0.03 to 0.70. L'invention concerne un hydrogel qui est formé à partir d'un éther de cellulose estérifié et d'eau par traitement thermique et synérèse. L'hydrogel comprend également une résine échangeuse d'ions et un ingrédient pharmaceutique ou nutritionnel. L'éther de cellulose estérifié comprend des groupes acyle monovalents aliphatiques et des groupes de formule -C(O)-R-COOH, R représentant un groupe hydrocarboné divalent, I) le degré de neutralisation des groupes -C(O)-R-COOH étant inférieur ou égal à 0,4 et II) le degré total de substitution de l'ester étant compris entre 0,03 et 0,70.