Ciba Specialty Chemicals Corporation

Basf Se Corporation

Ernst Eckstein

Clemens Auschra

Andreas Mühlebach

Marie-Odile Zink

Jean-Pierre Wolf

Akira Matsumoto

Ralf Knischka

Martin Holer

Manfred K&ouml;hler

Beat Michael Aebli

François Rime

The instant invention pertains to the preparation of polymers or copolymers wherein in a first step a controlled free radical polymerization process is carried out and in a second step the resulting polymer is modified by transesterification reactions. The final modified polymer or copolymer is useful as a dispersant for pigments. Further aspects of the invention are the thus prepared polymers or copolymers, a pigment concentrate containing the polymer or copolymer and a coating material containing the pigment concentrate.

Process for the post-modification of homo and copolymers prepared by controlled free radical polymerization processes

The present invention relates to a composition containing modified block copolymer dispersants and dispersible inorganic or organic pigments. The block copolymers are prepared by atom transfer radical polymerisation (ATRP) and modified with a salt forming group. The pigment composition is useful for preparing coating compositions, prints, images, inks or lacquers and other disperse systems.

Pigment compositions with modified ATRP copolymer dispersants

The present invention relates to a composition containing ATRP polymers and dispersible inorganic or organic pigment particles. The pigment composition is useful for preparing coating compositions, prints, images, inks or lacquers and other disperse systems.

Pigment composition containing ATRP polymers

The invention relates to comb polymers and macromonomers based on acrylates prepared by the ATRP (Atom Transfer Radical Polymerization) method. These polymers have an improved capability of dispersing pigments in the given solvent. The invention also relates to compositions comprising the comb polymers and macromonomers dispersible inorganic or organic pigment particles. The compositions are used by applying them to any suitable substrate, for example to metal, wood plastic or ceramic materials.

Comb polymers from ATRP macromonomers

The present invention relates to a composition containing modified block copolymer dispersants and dispersible inorganic or organic pigments. The block copolymers are modified with a salt forming group. The pigment composition is useful for preparing coating compositions, prints, images, inks or lacquers and other disperse systems.

Pigment compositions with modified block copolymer dispersants

Aqueous storage-stable, non-sedimenting photoinitiator suspensions comprising (a) a mono- or bis-acylphosphine oxide of formula (I), wherein R is C -C alkyl; C -C alkyl interrupted by one or more O atoms; C -C alkoxy; phenyl-C -C alkyl; or phenyl that is unsubstituted or substituted by C C alkyl, C -C alkoxy, halogen, cyclopentyl, cyclohexyl, C -C alkenyl, C -C alkyl interrupted by one or more O atoms, and/or by phenyl-C -C alkyl; or R is biphenylyl; R is an aromatic radical or has one of the meanings give for R ; R and R are each independently of the other C -C alkyl, C -C alkoxy or halogen; and R is hydrogen, C -C alkyl, C -C alkoxy or halogen; (b) a dispersant; and (c) water are suitable especially in the photopolymerisation of aqueous formulations comprising ethylenically unsaturated monomers.

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Rheinfelden, Germany

Ernst Eckstein