Ink or toner compositions, methods of use, and products derived therefrom
AssigneeBank of Canada
InventorsAndrea V. Firth, Theodoros Garanzotis
Life of this patent
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Abstract
Magnetic ink and toner compositions traditionally comprise magnetic materials in fine particulate form, either as a dry composition or a liquid suspension. Often such materials are black or dark in colour. Disclosed herein are particles compositions suitable for use as inks or toners, that exhibit desirable magnetic properties, and furthermore which include particles coated so they appear white substantially white, or coloured. Such compositions present new opportunities for the production of corresponding magnetic layers, when the compositions are deposited in an appropriate manner to a substrate.
Claims25
A composition for application to a substrate, to generate a pigmented magnetic layer upon and/or integral with said substrate, the composition comprising:
- (1) particles each comprising:
- (i) a core consisting essentially of a magnetic material;
- (ii) a coating at least substantially enveloping the core to cause said particles when applied to a substrate to form a pigmented magnetic layer having a Hunter Lab colour scale L-value of at least 50;
- and
- (iii) optionally one or more additional coatings each disposed between said core and said coating and/or at least substantially enveloping said coating;
- (2) optionally a liquid phase, which if present retains said particles at least partially in suspension;
- and
- (3) optionally one or more other magnetic or non-magnetic inks or toners.
A composition for application to a substrate, to generate a pigmented magnetic layer upon and/or integral with said substrate, the composition comprising:
- (1) particles each comprising:
- (i) a core consisting essentially of a magnetic material;
- (ii) a coating at least substantially enveloping the core to cause said particles when applied to a substrate to have a colour or hue that is different from that of the magnetic material of the core;
- and
- (iii) optionally one or more additional coatings each disposed between said core and said coating and/or at least substantially enveloping said coating;
- (2) optionally a liquid phase, which if present retains said solid particles at least partially in suspension;
- and
- (3) optionally one or more other magnetic or non-magnetic inks or toners.
Dependencies are inferred from the claim text.