B - Operations – Transporting – 05 – D
Patent
B - Operations, Transporting
05
D
42/15, 204/91.33
B05D 3/06 (2006.01) B41M 5/165 (2006.01)
Patent
CA 1099101
Abstract of the Disclosure A process is provided for the production of a coating composition con- taining microcapsules having a hydrophilic core for use in the manufacture of pressure-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 emulsion component 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 and second wall-forming materials are soluble in the hydrophobic emulsion component,and the first wall-forming material is reactive with the second wall-forming material 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. Mixing is 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 applying the dispersion of the microcapsules prepared as above to a substrate, and curingthe dispersion by subjecting the dispersion on the substrate to radiation for a period of time sufficient to cure the radiation curable hydrophobic liquid, thereby producing a tack-free, resinous film on the substrate. - 1 -
301260
Lee Yu-Sun
Shackle Dale R.
Ridout & Maybee Llp
The Mead Corporation
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