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1. WO2020117873 - ENCAPSULATION BY CROSS-LINKING OF ANIONIC POLYMERS BY PH INDUCED DISSOCIATION OF CATION-CHELATE COMPLEXES

Publication Number WO/2020/117873
Publication Date 11.06.2020
International Application No. PCT/US2019/064333
International Filing Date 03.12.2019
IPC
B01J 13/00 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
13Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
B01J 13/02 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
13Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
02Making microcapsules or microballoons
B01J 13/04 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
13Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
02Making microcapsules or microballoons
04by physical processes, e.g. drying, spraying
C08J 3/00 2006.01
CCHEMISTRY; METALLURGY
08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H142
3Processes of treating or compounding macromolecular substances
C08J 3/02 2006.01
CCHEMISTRY; METALLURGY
08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H142
3Processes of treating or compounding macromolecular substances
02Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
C08J 3/24 2006.01
CCHEMISTRY; METALLURGY
08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H142
3Processes of treating or compounding macromolecular substances
24Crosslinking, e.g. vulcanising, of macromolecules
Applicants
  • THE REGENTS OF THE UNIVERSITY OF CALIFORNIA [US]/[US]
Inventors
  • SCHER, Herbert B.
  • STROBEL, Scott
  • JEOH-ZICARI, Tina
  • WONG, Dana
Agents
  • O'BANION, John
Priority Data
62/775,33104.12.2018US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) ENCAPSULATION BY CROSS-LINKING OF ANIONIC POLYMERS BY PH INDUCED DISSOCIATION OF CATION-CHELATE COMPLEXES
(FR) ENCAPSULATION PAR RÉTICULATION DE POLYMÈRES ANIONIQUES PAR DISSOCIATION INDUITE PAR PH DE COMPLEXES CATION-CHÉLATE
Abstract
(EN)
Microencapsulation methods are provided using encapsulant, fiber or film forming compositions of a cross-linkable anionic polymer, a multivalent cation salt, a chelating agent, and a volatile base. During the formation of this composition, the generally acidic chelating agent is titrated with a volatile base to an elevated pH to improve ion-binding capability. Multivalent cations are sequestered in cation-chelate complexes. Cross-linkable polymers in this solution will remain freely dissolved until some disruption of equilibrium induces the release of the free multivalent cations from the cation-chelate complex. Vaporization of the volatile base drops the pH of the solution causing the cation-chelate complexes to dissociate and liberate multivalent cations that associate with the anionic polymer to form a cross-linked matrix. During spray-drying, the formation of a wet particle, polymer cross-linking, and particle drying occur nearly simultaneously.
(FR)
La présente invention concerne des procédés de micro-encapsulation utilisant un encapsulant, une fibre ou un film formant des compositions d'un polymère anionique réticulable, d'un sel de cation multivalent, d'un agent de chélation et d'une base volatile. Pendant la formation de cette composition, l'agent de chélation généralement acide est titré avec une base volatile à un pH élevé pour améliorer la capacité de liaison ionique. Des cations multivalents sont séquestrés dans des complexes cation-chélate. Des polymères réticulables dans cette solution resteront librement dissous jusqu'à ce qu'une certaine rupture de l'équilibre induise la libération des cations multivalents libres à partir du complexe cation-chélate. La vaporisation de la base volatile fait chuter le pH de la solution, amenant les complexes cation-chélate à dissocier et libérer des cations multivalents qui s'associent au polymère anionique pour former une matrice réticulée. Pendant le séchage par pulvérisation, la formation d'une particule humide, une réticulation de polymère et un séchage de particules se produisent presque simultanément.
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