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US 5,310,778 AGranted
Process for preparing ink jet inks having improved properties
AssigneeE. I. Du Pont de Nemours and Company
InventorsArthur Shor, Harry J. Spinelli
Life of this patent
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Abstract
A process for preparing aqueous pigmented ink jet inks with improved properties, comprising the steps of (a) charging a rubber two-roll milling apparatus with a pigment and a polymeric dispersant; (b) milling to obtain a dispersion of pigment with polymeric dispersant; and (c) dispersing the dispersion in an aqueous carrier medium.
Claims17
In a process for preparing aqueous pigmented ink jet inks wherein a dispersion of pigment and a polymeric dispersant is dispersed in an aqueous carrier medium, the improvement comprising:
- (a) charging a two-roll milling apparatus with a pigment and a polymeric dispersant, wherein said polymeric dispersant consists essentially of a random or block polymer having a molecular weight below 10,000 prepared from monomers selected from the group consisting essentially of substituted or unsubstituted acrylates or methacrylates and mixtures thereof;
- (b) milling to obtain a dispersion of pigment with polymeric dispersant;
- and
- (c) dispersing the pigment dispersions from step (b) in an aqueous carrier medium.
1 more element
Dependencies are inferred from the claim text.