Microencapsulation by interfacial polyaddition

Details Microencapsulation by interfacial polyaddition Microencapsulation by interfacial polyaddition

1988-02-11

1989-10-24

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

42840221, 42840224, 428914, 424408, 424455, 424497, 106 21, 264 47, 264 433, 521 65, 521 67, B01J 1302

Patent

active

048762903

ABSTRACT:
Microcapsules, and especially suspensions of microencapsulated colorants well adapted for the manufacture of carbonless papers, are produced by emulsifying a hydrophobic organic fluid which includes an aliphatic diisocyanate and an isocyanurate ring trimer of an aliphatic diisocyanate, and optionally a dissolved organic material, in an essentially aqueous liquid containing a protective colloid, a surfactant, or both, wherein the weight ratio of aliphatic diisocyanate/trimer ranges from 0.05/l to 0.70/l and the surface tension between the aqueous phase and the hydrophobic organic phase ranges from 0 to 20 mN/m, and then forming microcapsules by interfacially reacting a polyamine with the emulsion which results, thereby constituting polyurea walls of said microcapsules by polyaddition.

REFERENCES:
patent: 4738898 (1988-04-01), Vivant

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