PROCESS FOR THE PRODUCTION OF A PRESSURE-SENSITIVE CARBONLESS COPY SHEET USING MICROCAPSULES FORMED IN SITU IN A RADIATION CURABLE BINDER

摘要

Abstract of the DisclosureA process is provided for the production of a coating composition con-taining microcapsules having a hydrophilic core for use in the manufacture ofpressure-sensitive carbonless transfer papers comprising the following steps.A hydrophilic emulsion component is prepared by dispersing at least one chromo-genic material being soluble in the hydrophilic liquid. A hydrophobic emulsioncomponent is prepared by dispersing an emulsifier in a radiation curable hydro-phobic liquid. A first wall-forming material and a second wall-forming materialare added to the hydrophobic emulsion component, with mixing. The first andsecond wall-forming materials are soluble in the hydrophobic emulsion component,and the first wall-forming material is reactive with the second wall-formingmaterial to form a polymeric capsule wall. The resultant polymeric capsule wallis substantially insoluble in the hydrophilic and the hydrophobic emulsion com-ponents. The hydrophobic emulsion component is mixed together with the hydro-philic emulsion component to form an emulsion containing droplets of the hydro-philic emulsion component dispersed in the hydrophobic emulsion component. Mixingis maintained for a period of time sufficient to allow the first and second wall-forming materials to react to form a dispersion of microcapsules in the hydro-phobic emulsion component. The formed microcapsules have capsule walls substan-tially impermeable to the hydrophobic and the hydrophilic emulsion components.Pressure-sensitive carbonless transfer paper may be produced by applyingthe dispersion of the microcapsules prepared as above to a substrate, and curingthe dispersion by subjecting the dispersion on the substrate to radiation for aperiod of time sufficient to cure the radiation curable hydrophobic liquid,thereby producing a tack-free, resinous film on the substrate.- 1 -