Capsule manufacture

Details Capsule manufacture Capsule manufacture

B - Operations, Transporting

01

J

117/45.3

B01J 13/00 (2006.01) B01J 13/18 (2006.01) C08G 12/32 (2006.01)

Patent

CA 1108943

CAPSULE MANUFACTURE 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 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 polyelectro- lyte 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 manufactur- ing vehicle higher than previously possible.

288868

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