Capsule manufacture

Details Capsule manufacture Capsule manufacture

1976-12-30

1978-07-11

Lovering, Richard D.

Compositions

Preservative agents

Anti-corrosion

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

Patent

active

041001036

ABSTRACT:
A process is disclosed for performing encapsulation, en masse, by an in situ polymerization reaction to yield capsule wall material. The polymerization comprises a reaction between melamine and formaldehyde and/or polycondensation of monomeric methylol melamine or etherified methylol melamine, or a low molecular weight polymer thereof, 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 micro-capsules in concentrations of capsule to capsule manufacturing vehicle higher than previously possible.

REFERENCES:
patent: 3074845 (1963-01-01), Geary
patent: 3607775 (1971-09-01), Yoshida et al.
patent: 3726803 (1973-04-01), Bayless et al.

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