Polyamide microcapsules reacted with isocyanate emulsion

Details Polyamide microcapsules reacted with isocyanate emulsion Polyamide microcapsules reacted with isocyanate emulsion

1993-06-01

1996-08-13

Wu, Shean C.

Stock material or miscellaneous articles

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

Particulate matter

4284022, 264 47, 42721334, A01N 2534, B01J 1302

Patent

active

055454836

ABSTRACT:
Polyamide microcapsules are reacted with an isocyanate emulsion to reduce microcapsule yellowing and decrease microcapsule permeability when used in carbonless copying systems. The isocyanate reacts with the surface of the polyamide shell to close discontinuities in the shell and improve impermeability. The isocyanate also reacts with free amines in the capsule slurry to reduce the presence of free amines that cause yellowing.

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