Process for the production of microcapsules

Details Process for the production of microcapsules Process for the production of microcapsules

1989-04-24

1991-07-30

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, 4284022, 42840222, 503214, 503215, B01J 1310, B01J 1320

Patent

active

050358448

ABSTRACT:
In a process for the production of microcapsules by coavervation of gelatin, carboxymethyl cellulose (CMC) and a second anionic polymer such as a polyvinylmethylether/maleic anhydride copolymer or an ethylene/maleic anhydride/copolymer, the weight ratio of gelatin:CMC is chosen to be in the range 1:0.14 to 1:0.05, and the CMC used is chosen to have a viscosity in the range of from 50 to 140 mPas (cps), when measured in 6.0% by weight aqueous solution at 20.degree. C. using a Brookfield RVT viscometer, Spindle No. 1, 10 r.p.m. The use of the specified weight ratio and CMC type permits significant increases in the solids content at which encapsulation can be carried out without increasing process viscosities to an unacceptable extent and/or giving rise to poor quality microcapsules. The process is particularly suitable for producing microcapsules for use in pressure-sensitive copying paper.

REFERENCES:
patent: 3041289 (1962-06-01), Katchen et al.
patent: 3510435 (1970-05-01), Sirine
patent: 4219439 (1980-08-01), Miyake et al.
patent: 4222891 (1980-09-01), Okimoto et al.
patent: 4394287 (1983-07-01), Scarpelli
Chemical Abstracts, vol. 90, No. 18, Apr. 30, 1979, p. 437, abstract no. 144324 (of Japanese Laid-Open Patent Appln. No. 78-125273).
Research Disclosure, No. 162, Oct. 1977, "Microcapsules".

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