Pigment for use in inkjet recording medium coatings and methods

Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...

Reexamination Certificate

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C106S486000, C106S487000, C428S032100, C428S032200, C428S032300, C524S437000, C524S556000, C524S557000, C524S563000, C524S571000, C524S577000

Reexamination Certificate

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10462779

ABSTRACT:
Pigment suitable for use in coating compositions for inkjet recording media. Surfaces of an inorganic particulate are interacted with a water-soluble polyvalent metal salt in an aqueous medium. The treated particle surfaces have a significant cationic surface charge imparted to them. The salt is a salt of a metal of Group II or Group III of the Periodic Table. Inkjet recording media treated with a coating composition containing the above pigment provide high density, fast-drying, and non-feathering ink images with suitable water fastness, while the coating compositions also offer cost advantages and improved rheology at higher pigment levels over coatings based on silica pigments.

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