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US 7,001,936 B2Granted
Pigmented inkjet ink
AssigneeLexmark International, Inc.
InventorsCharles Edward Akers, Jr., Sandra Helton McCain, Phillip Wayne Sisk, Jing X. Sun
Life of this patent
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Abstract
The present invention provides pigmented inks comprising self-dispersing pigment and an amino-containing compound. The addition of an amino-containing compound to the self-dispersing pigment can improve the reliability and performance of the ink in an inkjet printhead. The present invention also provides methods for making a surface modified pigment comprising associating a self-dispersing pigment with an amino-containing compound having no more than one primary amino group or one secondary amino group.
Claims13
An inkjet ink comprising:
- a self-dispersing pigment;
- a basic, amine-functional-group-containing compound selected from the group consisting of cyclic compounds comprising only one secondary amine functional group in the cyclic ring structure of said compounds and having no primary amine functional group, compounds comprising only one primary amine functional group and at least one tertiary amine functional group and having no secondary amine functional group, and tetrahydrofurfuryl amine;
- and
- an aqueous vehicle.
1 more element
Dependencies are inferred from the claim text.