Plastic and nonmetallic article shaping or treating: processes – Encapsulating normally liquid material – Liquid encapsulation utilizing an emulsion or dispersion to...
Patent
1988-03-28
1990-07-03
Terapane, John F.
Plastic and nonmetallic article shaping or treating: processes
Encapsulating normally liquid material
Liquid encapsulation utilizing an emulsion or dispersion to...
264 47, 42840221, B01J 1302
Patent
active
049389009
ABSTRACT:
Microcapsules are prepared by adding a methylolated melamine or methylolated urea to an aqueous emulsion of the core material dispersed in an aqueous solution of a styrene/maleic anhydride copolymer partially hydrolyzed in an alkaline condition and heating the mixture at 40.degree. to 90.degree. C. in an acidic condition so that a reaction product forming the capsule walls is produced by the esterification reaction between the carboxyl groups in the partial hydrolysis product and the methylol groups in the methylolated melamine or urea and the amidation reaction between the carboxylic anhydride groups in the former and the amino groups in the latter. By virtue of the three dimensional network structure, the capsule walls are very dense and highly resistant against heat, water and solvents.
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Derwent Abstract Accession, No. 88-157709/23, Japanese Pat. No. 63097223-A, Apr. 27, 1988.
Offenlegungsschrift 28 32 637; Publication Date Feb. 2, 1979; Priority Date (Japan) Jul. 27, 1977.
Etoh Kei
Moriwaki Masafumi
Sekihara Hiroyuki
Covert John M.
Terapane John F.
Toppan Moore Co., Ltd.
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