ENCAPSULATION BY INTERFACIAL POLYCONDENSATION

• US 3,577,515 A
• Filed: 03/04/1968
• Issued: 05/04/1971
• Est. Priority Date: 12/13/1963
• Status: Expired due to Term

• Current Assignee: Jan E. Vandegaer
• Original Assignee: Jan E. Vandegaer
• Inventors: Vandegaer, Jan E.
• Application Number:
  US04/710,293
• Time in Patent Office: 1,156 Days
• US Class Current: 424/497
• CPC Class Codes: A01N 25/28 Microcapsules or nanocapsules
• CPC Class Codes: B01J 13/16 Interfacial polymerisation
• CPC Class Codes: B01J 13/18 In situ polymerisation with all reactants being present in the same phase
• CPC Class Codes: B44C 1/1704 Decalcomanias provided with a particular decorative layer, e.g. specially adapted to allow the formation of a metallic or dyestuff layer on a substrate unsuitable for direct deposition B44C1/1716, B44C1/1737 take precedence
• CPC Class Codes: C08G 18/0861 in the presence of a dispersing phase for the polymers or a phase dispersed in the polymers
• CPC Class Codes: C08G 69/00 Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule products obtained from isocyanates or isothiocyanates C08G18/00; polyamide-imides C08G73/14

Abstract

PROCEDURE FOR ENCAPSULATION OF MATERIALS INITIALLY EMBODIED, CONTAINED OR CARRIED IN LIQUID IS EFFECTED BY INTERFACIAL POLYCONDENSATION BETWEEN COACTING INTERMEDIATES RESPECTIVELY IN IMMISCIBLE LIQUIDS, DROPLETS OF ONE LIQUID WHICH IS TO BE ENCAPSULATED AND WHICH CONTAINS ONE INTERMEDIATE BEING FIRST ESTABLISHED IN A BODY OF THE OTHER LIQUID. THEREAFTER THE SECOND INTERMEDIATE IS INCORPORATED IN THE OTHER LIQUID TO PRODUCE MINUTE CAPSULES OF THE FIRST LIQUID HAVING A SKIN OF POLYCONDENSATE, E.G. POLYAMIDE, POLYSULFONAMIDE, POLYESTER, POLYCARBONATE, POLYURETHANE, OR POLYUREA. NOTABLY EFFECTIVE OPERATION INVOLVES CONTINUOUSLY SUPPLYING BOTH THE FIRST LIQUID CONTAINING THE FIRST INTERMEDIATE, AND THE SECOND LIQUID, INTO A REGION WHERE CONTINOUS AGITATION EFFECTS DISPERSION OF THE FIRST LIQUID AS DROPLETS, THE DISPERSION BEING CONTINUOUSLY BROUGHT TOGETHER WITH THE SECOND INTERMEDIATE, THEREBY CONTINUOUSLY ESTABLISHING THE DROPLET DISPERSION IN LIQUID CONTAINING THE SECOND INTERMEDIATE, AND IN CONSEQUENCE CONTINUOUSLY PRODUCING ENCAPSULATED DROPLETS BY INTERFACIAL POLYCONDENSATION BETWEEN THE INTERMEDIATES.

Claims