Process for making particulate compositions

US6531254B1 · kind B1 · utility

Assignee

• Avecia Limited · NL

Inventors

• Alison Dawn Bedells · Manchester, GB
• Daniel Patrick Morris · Manchester, GB

Key dates

• Filing date: Oct 2, 2000
• Grant date: Mar 11, 2003
• Expiry date: Oct 2, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2325/04
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

There is described a process for producing a particulate composition comprising the steps of:(a) forming a first dispersion comprising first particles stabilized in a first fluid by first species;(b) optionally the step of forming a second dispersion comprising second particles stabilized in a second fluid, miscible with the first fluid, by second species;(c) after (or simultaneously with) the optional step of mixing the first and second dispersions together if the second dispersion was formed from step b); inducing association between the dispersed particles to form clusters; and(d) binding together the particles within the clusters; characterized in that the first and/or second particles comprise at least one polar functional group to facilitate the binding of the particles in step (d).Preferably the polar group is other than an acid group, more preferably comprises at least one hydroxy group, non-acidic polar group and/or non-basic polar group, most preferably comprises one or more hydroxy and/or ether groups (e.g. an optionally polymeric alkylene glycol alkyl ether).