Ciba-geigy Corporation

Ciba Specialty Chemicals Corporation

Martin Holer

Ivan Orban

Hans Mollet

Valerio Borzatta

Jean-Pierre Wolf

Rinaldo Husler

Piero Piccinelli

Manfred K&ouml;hler

Ernst Eckstein

Beat Michael Aebli

Sandor Gati

Martine Goliro

Andre Kaufmann

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.

Photoinitiator formulations

2-(2,4-Dihydroxyphenyl)-4,6-bis(2,4-dimethylphenyl)-s-triazine is prepared by reacting cyanuric chloride with m-xylene at a temperature of 0.degree.-110.degree. C. in the presence of a Lewis acid and at least one inert chlorinated aromatic solvent to give the intermediate 2-chloro-4,6-bis(2,4-dimethylphenyl)-s-triazine. This intermediate, without being isolated, is then reacted with resorcinol to give the final desired product 2-(2,4-dihydroxyphenyl)-4,6-bis(2,4-dimethylphenyl)-s-triazine in good yield.

Process for the preparation of

The invention relates to a process for the preparation of polyalkylated aromatic carboxylic acids of formula I ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are each independently of one another hydrogen, C.sub.1 -C.sub.20 alkyl, halogen or C.sub.5 -C.sub.8 cycloalkyl, with the proviso that at least two of the substituents R.sub.1, R.sub.2, R.sub.3, R.sub.4 or R.sub.5 are alkyl and/or cycloalkyl, by reacting corresponding aromatic hydrocarbons with carbon dioxide, which reaction is carried out observing special ratios of temperature and pressure. The invention furthermore relates to a one-pot process for the preparation of the corresponding acyl halides.

Process for the preparation of alkylated aromatic carboxylic acids and

Highly concentrated flowable dispersions of corrosion inhibitors can be prepared by stirring a filter cake of the corrosion inhibitor with a dispersant and a thickener. These dispersions are storage stable.

Flowable aqueous dispersions of polycarboxylic acid corrosion inhibitors

A process for the preparation of compounds of the formula I is described ##STR1## in which R.sup.1 and R.sup.2 independently of one another are C.sub.1 -C.sub.7 alkyl; and R.sup.3 is hydrogen or halogen, by reaction of a diazonium salt of a 2-nitroaniline in acid aqueous solution with a phenol dispersed in water. The process comprises employing as the dispersant a C.sub.8 -C.sub.20 alkanesulfonic acid or a corresponding alkanesulfonate or a mixture of sulfonic acid and sulfonate together with a polyvinyl alcohol. The resulting compounds of the formula I can advantageously be reacted further to give benzotriazoles of the formula V ##STR2## which are used as light stabilizers.

Azo coupling of 2-nitroanilines with 2,4,-disbustituted phenols

Storage-stable, non-sedimenting emulsions comprising

Aqueous antioxidant emulsions

Process for the methylation of compounds at least one group of the formula (I) ##STR1## by means of a mixture of formaldehyde and formic acid in a reaction medium consisting of an aromatic hydrocarbon solvent.

Process for the methylation of triazine compounds containing

Storage-stable, non-sedimenting emulsions containing

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Magden, Switzerland

Martin Holer