Fujifilm Imaging Colorants, Inc.

Hewlett-packard Development Company, L.P.

John Patrick O'Donnell

Tom Annable

Mark Holbrook

Stephen G Yeates

Neil Anthony Tallant

Kevin Johnson

Owen Lozman

Steven Kay

Jitin Joshi

Neil Tallant

A process for preparing an encapsulated pigment dispersion suitable for use in an ink jet printing ink comprising the following steps in the order I) followed by II):

Process, dispersions and use

A process for preparing an aqueous pigment dispersion suitable for use in an ink jet printing ink comprising the following steps in the order I) followed by II):

A process for preparing a modified particulate solid comprising reacting a dispersant with a compound in the presence of a particulate solid and a liquid medium, characterised in that: The process provides a modified particulate solid having improved stability which is particularly useful for liquid vehicles having and range of polarities and for incorporation into ink jet printing inks.

Dispersant-encapsulated particulate solids

An ink-jet printing process comprising the steps (a) and (b) in any order or simultaneously: (a) applying an ink to a substrate by means of an ink-jet printer to form an image on a substrate; and (b) applying to the substrate a fixing composition comprising a liquid medium and a polymer containing a plurality of monoguanide and/or biguanide groups by means of an ink jet printer; characterised in that in the fixing composition has a chloride concentration less than 400 ppm by weight.

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Manchester, United Kingdom

John Patrick O'Donnell