Production of dual walled microcapsules by reducing ph to...

Details Production of dual walled microcapsules by reducing ph to... Production of dual walled microcapsules by reducing ph to...

B - Operations, Transporting

01

J

117/46

B01J 13/02 (2006.01) B01J 13/18 (2006.01) B41M 5/165 (2006.01)

Patent

CA 1052195

TITLE OF THE INVENTION DUAL-WALLED MICROCAPSULES AND METHOD FOR PRODUCING THE SAME INVENTOR GEORGE E. MAALOUF ABSTRACT OF THE DISCLOSURE: Disclosed is a process for preparing improved dual- walled microcapsules which are useful in connection with carbonless copying systems. Also disclosed are the dual-walled microcapsules themselves which comprise minute discrete drop- lets of liquid fill material including an initially colorless chemically reactive color forming dye precursor and a carrier therefor encapsulated within individual, rupturable, generally continuous shells. The shells comprise inner and outer poly- condensate layers. The process comprises the step of catalyz- ing the reactions whereby the outer shell is formed with the by-products of the reaction by which the inner shell is formed.

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