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OwnerJohn D. Goddard, Alan R. Pitt +3inventors
InventorsJohn D. Goddard, Alan R. Pitt, Elizabeth A. Simister, Mark Bradley, Anais F. Ronot
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Pigments for inkjet inks are controllably functionalised to improve water-dispersibility, ozone resistance, etc., by irradiation of the pigment particle with high energy radiation, such as gamma radiation in air or by plasma activation, to form a stable functionalisable intermediate pigment particle, then activating the stable functionalisable intermediate, e.g. by heating, in the presence of a functionalising precursor (e.g. a polymer or polymerisable monomer) to form a modified pigment particle having one or more functionalising group grafted onto the pigment particle.
A method of functionalising a pigment particle, said method comprising the steps of treating a pigment particle by subjecting it to high energy radiation to form a stable functionalisable intermediate, subjecting said stable functionalisable intermediate to at least one activating treatment capable of activating said stable functionalisable intermediate to form an activated functionalisable intermediate and contacting said activated functionalisable intermediate with at least one functionalising precursor, whereby a functionalised pigment is formed, which comprises a pigment particle having one or more functionalising groups attached thereto, each of which functionalising groups are capable of providing a functional feature to the pigment particle.
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A functionalised pigment particle comprising a pigment particle having bound covalently thereto at least two different functionalising groups, each capable of imparting one or more functional features to said pigment particle, said at least two functionalising groups being arranged as two first order functionalising groups and/or as a first order functionalising group and a second order functionalising group, wherein said at least one or more functional features includes improved ozone-resistance.
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Dependencies are inferred from the claim text.