Fujifilm Imaging Colorants, Inc.

Avecia Limited

Daniel Morris

Martin Edwards

Mohammed Nawaz

John Dylan Morgan

Oliver Callaghan

Simon Pickard

Zoonia Mehmood

Alison Dawn Bedells

Miguel Angel Rodriguez-Vazquez

Philip John Double

Janette Cordwell

Alan Hopper

William Malcolm Logan Wood

Kumar Abhinava

Philip Double

A process for printing a substrate comprising applying thereto an ink by means of an ink jet printer, wherein the ink comprises a latex binder, a liquid medium comprising water and organic solvent, and polymer-encapsulated pigment particles comprising a carboxy-functional dispersant crosslinked around a pigment core by a crosslinking agent, wherein the ink has a minimum film-forming temperature below 70&#xb0; C. Inks are also claimed. The process and inks are useful for printing temperature-sensitive substrates, e.g. foil balloons and wrapping materials for special occasions.

Inks and printing process

According to a first aspect of the present invention there is provided a process for preparing a particulate solid comprising the steps i) to iv): i) providing a dispersion of polymer particles in a liquid medium, said polymer being obtained or obtainable by the copolymerization of at least the monomers in components a) to d): a) 45 to 90 parts of one of more hydrocarbyl (meth) acrylates each having a homopolymer Tof from 90 to 130&#xb0; C. and having no hydrophilic groups; b) 10 to 55 parts of one or more ethylenically unsaturated monomers each having homopolymer Tof below 90&#xb0; C. and having no hydrophilic groups; c) 0 to 40 parts of one or more styrenic monomers having a homopolymer Tof at least 90&#xb0; C. and having no hydrophilic groups; d) 0 to 10 parts of one or more ethylenically unsaturated monomers each having at least one hydrophilic group; wherein all the parts are by weight; ii) associating the particles to form clusters of particles; iii) optionally stabilizing the clusters; iv) heating the clusters above the glass transition of the polymer.

Process for preparing a particulate solid, a particulate solid and a dispersion

A process for preparing a toner comprising a binder resin and a colorant, wherein the binder resin comprises a polyester resin having an acid value (AV) greater than 5 mg KOH/g, the process comprising: providing an aqueous dispersion of self-dispersed polyester resin particles and associating the polyester resin particles by means of a change in the pH of the dispersion.

Toner comprising polyester, process for making the toner and uses thereof

A toner comprising toner particles which comprise binder resin and colorant, wherein the binder resin is made from latexes which comprise a low molecular weight (LMW) latex of resin particles having a weight average molecular weight (Mw) less than 50,000 and a medium molecular weight (MMW) latex of resin particles having a Mw from 50,000 to 500,000, wherein the glass transition temperature (Tg) of the resin particles of the LMW latex is not greater than 52&#xb0; C.

Toners made from latexes

A process for preparing a toner comprising a binder resin and a colorant, wherein the binder resin comprises a polyester resin having an acid value greater than 5 mg KOH/g, the process comprising: providing an aqueous dispersion of polyester resin particles stabilized by an ionic surfactant and then associating the polyester resin particles.

The invention provides a process for the manufacture of a toner which comprises the steps of: wherein R is a carbocyclic or heterocyclic radical which may be optionally substituted and Zis a bond or linker groupand wherein the amount of carboxy functional compound of Formula (1) provided is greater than 3% by weight, the amount of carboxy functional compound being calculated according to the following equation:  The process advantageously may produce a toner of small size and narrow particle size distribution. The present invention also provides a toner manufactured by the process.

Toner and manufacturing process therefor

The invention provides a process for the manufacture of a toner which comprises the steps of: wherein R is a carbocyclic or heterocyclic radical which may be optionally substituted and Zis a bond or linker group,on condition that the amount of carboxy functional compound of Formula (1) provided in acid and/or salt form is at least 1.5% by weight, wherein the amount of carboxy functional compound is calculated according to the following equation:  The process advantageously may produce a toner of small size and narrow particle size distribution. The present invention also provides a toner manufactured by the process.

A toner for developing an electrostatic image comprising toner particles which include a binder resin, a wax and a colorant, wherein the wax has a melting point of between 50 and 150&#xb0; C., the wax exists in the toner particles in domains of 2 &#x3bc;m or less mean particle size and (a) the mean circularity of the toner particles as measured by a Flow Particle Image Analyser is at least 0.90; and (b) the shape factor, SF1, of the toner particles is at most 165. A process for the manufacture of said toner which comprises the following steps: providing a latex dispersion; providing a wax dispersion; providing a colorant dispersion; mixing the latex dispersion, wax dispersion and colorant dispersion; and causing the mixture to flocculate.

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Manchester, United Kingdom

Daniel Morris