Minnesota Mining and Manufacturing Company

Richard S Law

Jack W Charbonneau

Wayne O Otteson

Willis J Ludwig

Donald D Buerkley

Hot-melt imaging compositions useful for solventless coating on paper substrates. The imaging compositions comprise imaging microcapsules having melamine-urea-formaldehyde condensation polymer shells and an organic liquid dye precursor dispersed in a hot-melt binder. The compositions can be coated on paper substrates by conventional coating techniques to provide carbonless papers.

Pressure-sensitive marking materials

The disclosed moldable compositions contain a metal salt which is a coreactant for, preferably, one of the conventional iron/polyhydric phenol image-forming reactions. The metal salt is dissolved in a liquid plasticizer, and the liquid plasticizer is blended with solid waxes to form a solid, substantially non-toxic, non-hygroscopic, moldable waxy material which is non-softening under normal conditions but which can easily be shaped, hot-melt coated, or the like at temperatures above 60.degree. C. The composition is useful for making wax imaging crayons and sheet-like dispensing means for the metal salt imaging chemical.

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Newport, MN, United States of America

Richard S Law