PRESSURE-SENSITIVE COPYING PAPER SHEETS

摘要

PRESSURE-SENSITIVE COPYING PAPER SHEETS Pressure-sensitive copying paper containing a solution of a dye-precursor agent in microencapsulated form, wherein the dye-precursor agent is dissolved in a hydrophobic organic solvent and encapsulated in capsules composed of the polyaddition product of a diisocyanate of Formula (I) (I) wherein R represents a divalent aliphatic radical, and a diamine. Le A 18 225