Capsule manufacture

Details Capsule manufacture Capsule manufacture

B - Operations, Transporting

01

J

117/45.3

B01J 13/02 (2006.01) B01J 13/18 (2006.01) B41M 5/165 (2006.01) C08K 7/00 (2006.01) C08K 9/10 (2006.01) C09C 3/00 (2006.01)

Patent

CA 1202833

Abstract of the Disclosure A process is disclosed for performing encapsula- tion, en masse, by an in situ polymerization reaction to yield capsule wall material. The reaction comprises the polymerization of urea and formaldehyde, monomeric or low molecular weight polymers of dimethylol urea or methylated dimethylol urea, melamine and formal- dehyde, monomeric or low molecular weight polymers of methylol melamine or methylated methylol melamine, in an aqueous vehicle and the reaction is conducted in the presence of mixtures of poly-electrolyte material and polystyrene sulfonic acid and/or salts thereof in certain critical proportions. The disclosed encapsulation process provides improved resistance of the emulsion of intended capsule core material to destabilization and permits the manufacture of micro- capsules with improved drop size distribution.

443716

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