B - Operations – Transporting – 41 – L
Patent
B - Operations, Transporting
41
L
42/15
B41L 1/36 (2006.01) B01J 13/10 (2006.01) B01J 13/20 (2006.01) B05D 3/06 (2006.01) B41M 5/165 (2006.01) C09K 3/00 (2006.01)
Patent
CA 1110064
PROCESS FOR PRODUCING A PRESSURE-SENSITIVE CARBONLESS COPY SHEET USING MICROCAPSULES FORMED IN SITU IN A RADIATION CURABLE BINDER YU-SUN LEE AND DALE R. SHACKLE Abstract of the Disclosure A process is provided for producing a coating composition containing microcapsules having a hydrophilic core material for use in the manufacture of pressure-sensitive carbonless transfer papers comprising the following steps of preparing a hydrophobic emulsion component by dispersing an emulsi- fier in a radiation curable hydrophobic liquid, preparing a hydrophilic emulsion component by dispersing a first wall-forming material in a hydro- philic liquid containing at least one chromogenic material being soluble in the hydrophilic liquid, the first wall-forming material being reactive with a second wall-forming material to form a polymeric capsule wall, the polymeric capsule wall being substantially insoluble in the hydrophilic and the hydro- phobic liquids and mixing the hydrophobic emulsion component with the hydro- philic emulsion component to form an emulsion containing droplets of the hydro- philic emulsion component dispersed in the hydrophobic emulsion component. The second wall-forming material is then added to the emulsion with agitation, the agitation continuing for a period of time sufficient to allow the first and second wall-forming materials to react to form a dispersion of microcap- sules in the hydrophobic emulsion component, the microcapsules having cell walls substantially impermeable to the hydrophobic and the hydrophilic liquids. A process is provided for producing a pressure-sensitive carbonless transfer paper comprising the further steps of applying the coating composition to a substrate and curing the coating composition by subjecting the coating cort- position 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. A novel coating composition is produced com- prising microcapsules having a hydrophilic core material dispersed in a radiation curable hydrophobic liquid. A pressure-sensitive carbonless trans- fer sheet is produced comprising a substrate having a plurality of surfaces, at least one of the surfaces being coated with a tack-free resinous film com- prising a radiation cured resin having dispersed therein microcapsules con- taining a hydrophilic liquid containing at least one chromogenic material, the chromogenic material being soluble in the hydrophilic liquid.
296117
Lee Yu-Sun
Shackle Dale R.
Ridout & Maybee Llp
The Mead Corporation
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