Microcapsules, method for their preparation, and sheet material

Details Microcapsules, method for their preparation, and sheet material Microcapsules, method for their preparation, and sheet material

1976-11-15

1978-08-08

Lovering, Richard D.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

252316, 282 275, 424 32, 428914, B32B 326, B01J 1302

Patent

active

041058232

ABSTRACT:
A method of encapsulating finely divided particulate material, such as minute droplets of a water-immiscible liquid, to produce microcapsules in which the particulate material is surrounded by polymeric shells, comprising the steps of forming a dispersion of the particulate material in an aqueous medium containing a water-soluble ureaformaldehyde precondensate, a water-soluble melamineformaldehyde precondensate and a water-soluble polymer which is capable of being cross-linked by said precondensates, and condensing said precondensates by acid catalysis with resultant cross-linking of the polymer about the particulate material so as to form the polymeric shells. The polymer may be a cellulose derivative, starch, a starch derivative, a polyacid, a polyester, a polyanhydride copolymer, a polyacrylamide or a polyacrylamide copolymer, and is preferably an acrylamide/acrylic acid copolymer.

REFERENCES:
patent: 2473463 (1949-06-01), Adams
patent: 3137631 (1964-06-01), Soloway
patent: 3607775 (1971-09-01), Yoshida et al.
patent: 3875074 (1975-04-01), Vassiliades et al.
patent: 4001140 (1977-01-01), Foris et al.

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