Ciba Specialty Chemicals Corporation

Ciba Corporation

Basf Se Corporation

Damien Thurber Cole

Colin Dennis Campbell

Suruliappa Gowper Jeganathan

Yingxia He

Kevin Rodney Gerzevske

Roger Reinicker

John Adams

Joseph E Sarver

Harold Raymond Taylor, Iii

Solid, low dust pigment compositions are formed i by mixing pigments with certain polymer stabilizers under conditions wherein the stabilizers are in a liquefied state. The pigment compositions are easily handled and have a high color yield when incorporated into polymer substrates. In many cases, the color development attained is not readily achievable using pigment compositions comprising conventional carriers.

Low-dust additive and pigment blends with improved color

A method for laser marking a substrate which method comprises exposing a composition comprising a tetrabenzodiazadiketoperylene pigment to laser radiation to produce a fluorescent marking readily apparent under UV light is disclosed. Many of the tetrabenzodiazadiketoperylenes herein are novel. This method can yield fluorescent markings which are not readily apparent under ambient light. A method for producing non-fluorescent laser marked substrates containing tetrabenzodiazadiketoperylene dyes is also disclosed.

Tetrabenzodiazadiketoperylene pigments for laser marking

Tetrahydro- and dihydroquinophenanthrine dione fluorescent whitening agents and a process for their preparation are provided.

Quinophenanthrine diones fluorescent whitening agents

The present invention relates to a process for the synthesis of beta-quinacridone by oxidation in the presence of selected additives that promote the formation of the desired crystal phase and particle size.

Synthesis of small particle size quinacridone of beta crystal phase

Dialkyl succinylsuccinates are prepared in a pure form and in high yield by reacting an alkali metal alcoholate with an excess of dialkyl succinate under anhydrous conditions followed by isolation of the di(alkali metal) salt of the dialkyl succinylsuccinate and then neutralization of the salt with acid. The resulting dialkyl succinylsuccinate is isolated or used without isolation as an intermediate in the production of quinacridone pigments. The disclosed process provides for high yields and reduced organic waste compared with known processes.

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Drexel Hill, PA, United States of America

Damien Thurber Cole