Capsule manufacture

Details Capsule manufacture Capsule manufacture

1976-12-30

1978-05-02

Lovering, Richard D.

Compositions

Preservative agents

Anti-corrosion

71 64F, 106308M, 252182, 252522, 424 32, 426650, 427151, 427152, 428307, 428914, B01J 1302

Patent

active

040873765

ABSTRACT:
A process is disclosed for performing encapsulation, en masse, by an in situ polymerization reaction to yield capsule wall material. The polymerization includes a reaction between urea and formaldehyde or polycondensation of monomeric or low molecular weight polymers of dimethylol urea or methylated dimethylol urea in an aqueous vehicle and the reaction is conducted in the presence of negatively-charged, carboxyl-substituted, linear aliphatic hydrocarbon polyelectrolyte material dissolved in the vehicle. Liquid-liquid phase separation is accomplished and maintained by increase in the molecular weight of the resulting condensation polymer without further dilution of the manufacturing vehicle. The negatively-charged polyelectrolyte material is required and has an apparent effect of controlling or modifying the polymerization reaction. The disclosed encapsulation process permits manufacture of microcapsules in concentrations of capsule to capsule manufacturing vehicle higher than previously possible.

REFERENCES:
patent: 3016308 (1962-01-01), Macaulay
patent: 3074845 (1963-01-01), Geary
patent: 3516941 (1970-06-01), Matson
patent: 3607775 (1971-09-01), Yoshida et al.
patent: 4001140 (1977-01-01), Foris et al.

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