Microcapsule manufacture

Details Microcapsule manufacture Microcapsule manufacture

1986-08-01

1988-06-28

Lovering, Richard D.

Plastic and nonmetallic article shaping or treating: processes

Encapsulating normally liquid material

Liquid encapsulation utilizing an emulsion or dispersion to...

42840221, 428914, 503213, 503215, B01J 1302

Patent

active

047537590

ABSTRACT:
A process for manufacturing microcapsules by dissolving or dispersing microcapsule contents in an aqueous solution of acrylic acid-methacrylic acid copolymer and/or acrylic acid-itaconic acid copolymer, then polymerizing urea and/or melamine and formaldehyde in the solution or dispersion adjusted to pH 2.5.about.6.0, and forming film of urea-formaldehyde copolymer, melamine-formaldehyde copolymer, or urea-melamine-formaldehyde copolymer around capusle contents.
Microcapsules manufactured by this process are useful for colors for carbonless paper or thermo-changeable colors.

REFERENCES:
patent: 4328119 (1982-05-01), Iwasaki et al.
patent: 4574110 (1986-03-01), Asano et al.

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