Process for producing microcapsules

Details Process for producing microcapsules Process for producing microcapsules

1982-06-25

1984-05-22

Lovering, Richard D.

Plastic and nonmetallic article shaping or treating: processes

Encapsulating normally liquid material

Liquid encapsulation utilizing an emulsion or dispersion to...

264 43, 427151, 42840221, 428914, 346215, B01J 1302

Patent

active

044501234

ABSTRACT:
In producing microcapsules using the amino resin as a capsule wall in a system in which hydrophobic core material is dispersed or emulsified in an aqueous acidic solution containing an anionic colloidal substance, said anionic colloidal substance comprises an anionic, water-soluble copolymer consisting of at least three monomers including acrylic acid, hydroxyalkylacrylate or hydroxyalkylmethacrylate and styrenesulfonic acid. The process of the present invention provides a good emulsification against the variation of the emulsifying condition, a good stability of emulsion between the encapsulating reaction, an excellent stability against the variation of the encapsulating conditions and a superior capsule slurry. More desirable results may be obtained when an anionic, water-soluble copolymer which is obtained by copolymerizing one or more components selected from alkyl acrylate, methacrylic acid, alkyl methacrylate, acrylamide, methacrylamide, succinic ester of hydroxyalkyl acrylate, succinic ester of hydroxyalkyl methacrylate, vinyl acetate and acrylonitrile as fourth and further components in addition to the above-mentioned three components, is used.

REFERENCES:
patent: 3576760 (1971-04-01), Gould et al.
patent: 4105823 (1978-08-01), Hasler et al.
patent: 4328119 (1982-05-01), Iwasaki et al.
patent: 4356109 (1982-10-01), Saeki et al.

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