Encapsulation by urea/formaldehyde polymerization in...

Details Encapsulation by urea/formaldehyde polymerization in... Encapsulation by urea/formaldehyde polymerization in...

B - Operations, Transporting

01

J

117/45.3

B01J 13/02 (2006.01) B01J 13/18 (2006.01)

Patent

CA 1048867

ENCAPSULATION BY UREA/FORMALDEHYDE POLYMERIZATION IN PRESENCE OF POLYELECTROLYTE Abstract of the Disclosure 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 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 urea/formaldehyde reaction product 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.

223897

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