Compositions: coating or plastic – Coating or plastic compositions – Marking
Reexamination Certificate
2005-04-12
2005-04-12
Sample, David (Department: 1755)
Compositions: coating or plastic
Coating or plastic compositions
Marking
C106S031750, C106S031610
Reexamination Certificate
active
06878198
ABSTRACT:
Phase change ink compositions comprising (a) an ink carrier comprising a monoamide and a tetra-amide, and (b) pigment particles having oxygen-containing functional groups on the surfaces thereof. Also, processes for preparing a phase change ink which comprise (a) melting a tetra-amide which is solid at about 25° C.; (b) admixing with the molten tetra-amide pigment particles having oxygen-containing functional groups on the surfaces thereof; (c) maintaining the mixture of pigment and tetra-amide at a temperature of at least about 100° C. and at a temperature of no more than about 200° C. for a period sufficient to enable the molten tetra-amide to wet the pigment particle surfaces; (d) subsequent to wetting of the pigment particle surfaces with the molten tetra-amide, adding to the mixture a monoamide; (e) subsequent to addition of the monoamide, subjecting the resulting mixture to high shear mixing; and (f) subsequent to subjecting the mixture to high shear mixing, optionally adding to the mixture additional ink ingredients.
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Copending U.S. Appl. No. 10/722,162, filed concurrently herewith, entitled “Phase Change Inks,” by Raymond W. Wong, et al.
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Bedford Christine E.
Boils-Boissier Danielle C.
Breton Marcel P.
Drappel Stephan V.
Gardner Sandra J.
Byorick Judith L.
Faison Veronica F.
Sample David
Xerox Corporation
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