B - Operations – Transporting – 41 – M
Patent
B - Operations, Transporting
41
M
42/11
B41M 5/132 (2006.01)
Patent
CA 1160049
248,483 CAN/JGB Abstract of the Disclosure A stabilizing agent for use in electron donor- acceptor carbonless copying systems. The stabilizing agent is 2,2'-methylene-bis(4-methyl-6-t-butyl phenol). Systems in which the stabilizing agent is useful comprise a color-forming composition comprising at least one leuco dye which is fadeable or discolorable after development, a color-developing composition comprising an acidic coreactant material capable of reacting with the color- forming composition to provide colored products, and the stabilizing agent. The stabilizing agent prevents discoloration or fade of images produced by reaction of the color-forming composition with the color-developing composition. In a preferred embodiment, the color-forming composition additionally comprises dithiooxamide and/or dithiooxamide derivatives, the color-developing composition additionally comprises a transition metal ion capable of reacting with the dithiooxamide compound to produce a purple-colored product, and the reaction of the color-forming composition with the color-developing composition results in a neutral balclack colored product.
398321
Minnesota Mining And Manufacturing Company
Smart & Biggar
LandOfFree
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