Preparation of microencapsulated pigment

Details Preparation of microencapsulated pigment Preparation of microencapsulated pigment

1986-12-15

1989-01-17

Lovering, Richard D.

Coating processes

Particles, flakes, or granules coated or encapsulated

Solid encapsulation process utilizing an emulsion or...

106476, 42721331, 42721334, 42721335, 42721336, 427214, 430138, B01J 1302, B05D 310, C09C 156

Patent

active

047987413

ABSTRACT:
Pigment particles of a suitable size are microencapsulated by mixing them in a gelatin solution, coacervating the gelatin to coat them, cooling to set the gelatin, adding formaldehyde to harden the particles, sequestering unreacted formaldehyde with a bisulfite, adding gelatin to coat the hardened particles, precipitating the particles chemically or physically, and washing the precipitate.

REFERENCES:
patent: 3190837 (1965-06-01), Brynko et al.
patent: 3265629 (1966-08-01), Jensen
patent: 3510435 (1970-05-01), Sirine
patent: 3804775 (1974-04-01), Shiozaki et al.
patent: 4233392 (1980-11-01), Friedel
patent: 4297235 (1981-10-01), Hoshi et al.
patent: 4399209 (1983-08-01), Sanders et al.
patent: 4440846 (1984-04-01), Sanders et al.
patent: 4565764 (1986-01-01), Nakahara et al.

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