Microencapsulation using tertiary aliphatic isocyanate capsule w

Details Microencapsulation using tertiary aliphatic isocyanate capsule w Microencapsulation using tertiary aliphatic isocyanate capsule w

1990-09-10

1993-04-20

Lovering, Richard D.

Stock material or miscellaneous articles

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

Particulate matter

264 47, 503213, B01J 1316, B41M 5165

Patent

active

052041840

ABSTRACT:
A process for the production of microcapsules containing a core material is provided and includes the steps of providing a polar solvent, and adding thereto a dispersion of a tertiary aliphatic isocyanate and a core material in an oleophilic liquid and an amine-containing composition having at least three primary amine groups to form a mixture. The mixture containing these components is reacted to form microcapsules containing the core material. The tertiary aliphatic isocyanate preferably comprises an adduct of m-tetramethylxylene diisocyanate and trimethylolpropane. The core material may contain a dyestuff precursor which is capable of reacting with a color developer to form a color. The microcapsules containing dyestuff precursor may be used to coat a support sheet to form carbonless copy paper.

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patent: 4902667 (1990-02-01), Whitcomb et al.
patent: 5011885 (1991-04-01), Chen et al.
patent: 5037716 (1991-08-01), Moffatt

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