Microencapsulation by interfacial polyaddition

Details Microencapsulation by interfacial polyaddition Microencapsulation by interfacial polyaddition

1986-12-10

1988-04-19

Lovering, Richard D.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

71DIG1, 106 21, 264 47, 424408, 424455, 424497, 428914, 503215, B01J 1302

Patent

active

047388986

ABSTRACT:
A variety of materials, e.g., colorants, agricultural chemicals, pharmaceuticals, etc., are conveniently microencapsulated within polyurea skin membranes by interfacial polyaddition, by emulsifying a polyisocyanato hydrophobic liquid in an essentially aqueous medium, said polyisocyanato hydrophobic liquid comprising dissolved material to be microencapsulated, an aliphatic diisocyanate (i) and an isocyanurate ring trimer (ii) of an aliphatic diisocyanate, the ratio by weight of said diisocyanate (i) to said trimer (ii) ranging from 0.05/1 to 0.70/1, and then interfacially reacting a polyamine therewith. The resulting suspension of microcapsules is well adapted, e.g., for the production of carbonless papers.

REFERENCES:
patent: 4428978 (1984-01-01), Jabs et al.

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