METHOD FOR MANUFACTURING MICROCAPSULE AND RECORD SHEET USING MICROCAPSULE

• Main Authors: JINDEN CHIEN, RONCHIYAN RIIN, JIESHII HITSUPUSU SHINIA
• Format: Patent
• Language: English
• Published: 22.04.1992
• Subjects: APPARATUS SPECIALLY ADAPTED THEREFOR; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CINEMATOGRAPHY; COLOUR PRINTING; ELECTROGRAPHY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HOLOGRAPHY; LINING MACHINES; MATERIALS THEREFOR; ORIGINALS THEREFOR; PERFORMING OPERATIONS; PHOTOGRAPHY; PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES,e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTORDEVICES; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PHYSICS; PRINTING; PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; STAMPS; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; THEIR RELEVANT APPARATUS; TRANSPORTING; TYPEWRITERS

PURPOSE: To prevent the penetration of water into an internal phase by the formation of interpenetrating polymer network microcapsule walls around the said internal phase by reacting a functional acrylic resin or a copolymer and a formaldehyde condensation prepolymer with condensation reaction. CONSTITUTION: A functional acrylic resin or a copolymer having hydroxy functional groups or amine functional groups is added into an aqueous emulsion in which an internal phase composition is dispersed. Formaldehyde condensation prepolymer is added in the said emulsion simultaneously with an addition of a functional acrylic resin or a copolymer, or after the said addition. And then, the said functional acrylic resin or copolymer and formaldehyde condensed prepolymer are allowed to go through a condensation reaction to form microcapsule walls with an interpenetrating polymer network(IPN) around the internal phase. The microcapsule is prepared by forming a first capsule wall which wraps the internal phase and then by over-coating the said first capsule wall with a second capsule wall comprising the IPN.