Process for the preparation of microcapsules, and the microcapsu

Details Process for the preparation of microcapsules, and the microcapsu Process for the preparation of microcapsules, and the microcapsu

1980-09-30

1983-09-27

Lovering, Richard D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

71DIG1, 106308M, 106308N, 252522A, 282 275, 264 433, 264 47, 424 32, 42721331, 42721334, 4242484, 426 89, 426650, 4283206, 4283208, 428914, 521187, 521 74, B01J 1302

Patent

active

044068166

ABSTRACT:
In a process for the preparation of microcapsules based on a melamine-formaldehyde resin, in which the microcapsules are obtained by condensing a melamine-formaldehyde precondensate, its C.sub.1 -C.sub.4 -alkyl ethers, or mixtures thereof, in water in which the material forming the capsule core is dispersed, at a pH of from 3 to 6.5 and at from 20.degree. to 100.degree. C., the improvement that the water contains a homopolymer or copolymer which possesses sulfonic acid groups but is devoid of phenyl or sulfophenyl groups and has a K value of from 100 to 170 or a viscosity of from 200 to 5,000 mPa.s (shearing gradient 489 s.sup.-1 ; 20% strength solution at 25.degree. C.), and that the melamine-formaldehyde precondensate is added continuously, or in portions, in step with the rate of condensation.
The process gives individual capsules which are highly impermeable. The capsules are exceptionally useful for the production of pressure-sensitive recording materials.

REFERENCES:
patent: 3016308 (1962-01-01), Macaulay
patent: 3872023 (1975-03-01), Baum et al.
patent: 3939095 (1976-02-01), Sliwka et al.
patent: 4001140 (1977-01-01), Foris et al.
patent: 4100103 (1978-07-01), Foris et al.
patent: 4105823 (1978-08-01), Hasler et al.

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