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US 9,752,034 B2Granted
Functionalized quinacridone pigments
AssigneeE Ink Corporation
InventorsZiyan Wu, Jason D. Feick
Life of this patent
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Abstract
Quinacridone pigments that are surface-functionalized with glycidyl methacrylate, maleic anhydride, or 4-methacryloxyethyl trimellitic anhydride to create a functionalized pigment. The functional groups are then activated to bond hydrophobic polymers, thereby coating the pigment with the hydrophobic polymers. The quinacridone pigments can be used for a variety of applications. They are well-suited for use in electro-optic materials, such as electrophoretic media for use in electrophoretic displays.
Claims15
A pigment comprising Formula I:
- wherein R1 is a hydrogen, a C1-C3 alkyl group, a halogen, a hydroxyl, or —CH2CHR4CH2OCOR3;
- R2 is a hydrogen, C1-C3 alkyl group, or a halogen;
- R3 is —C(CH3)CH2, or a hydrophobic polymer having a molecular weight between 5 kD and 100 kD;
- and
- R4 is —OH or —O[CH2CH(CH2OCOC(CH3)CH2)O]xH, and x is an integer from 1 to 15.
2 more elements
A method for making a functionalized pigment, comprising:
- providing a pigment comprising Formula V:
- wherein R is a hydrogen, C1-C3 alkyl group, or a halogen;
- and
- reacting the pigment with glycidyl methacrylate, maleic anhydride, or 4-methacryloxyethyl trimellitic anhydride monomers to create a functionalized pigment.
1 more element
Dependencies are inferred from the claim text.