Capsules with a shell of water-soluble polymer cross linked...

Details Capsules with a shell of water-soluble polymer cross linked... Capsules with a shell of water-soluble polymer cross linked...

B - Operations, Transporting

01

J

117/15, 117/45.3

B01J 13/02 (2006.01) B01J 13/18 (2006.01) B32B 5/16 (2006.01) B41M 5/165 (2006.01)

Patent

CA 1067761

ABSTRACT A method of encapsulating finely divided solid or liquid particulate material to produce microcapsules in which small particles or drops of the material are surrounded by polymer shells, wherein, dispersion of the material is prepared in an aqueous medium containing a water-soluble urea-formaldehyde precondensate, a water soluble melamine-formaldehyde precondensate and a water soluble polymer which is capable of being cross-linked by said precondensates, and condensing said precondensates by acid catalysis with resultant cross linking of said polymer about said particulate material, thereby to form said polymeric shells.

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