Ciba-geigy Corporation

Henri Dubas

David G Leppard

David H Steinberg

Rudolf Kirchmayr

Compounds of the formula ##STR1## in which R is hydrogen or hydroxyl, R.sub.1 is alkyl, alkoxy, amino or aryl, and R.sub.2 is hydrocarbylcarbonyl or hydrocarbylsulfonyl, are highly suitable for stabilizing magenta couplers in photographic materials.

Substituted benzophenone stabilizers

Process for stabilizing magenta couplers and the corresponding image

Lubricant compositions or hydraulic fluid compositions containing

Asymmetric disulfides in lubricant compositions

A composition containing a lubricant or a hydraulic fluid and at least one compound of the formula I ##STR1## in which both R.sup.1, independently of one another, are a hydrogen atom, a metal cation, NH.sub.4.sup..sym., primary, secondary, tertiary or quaternary ammonium, linear or branched C.sub.1 -C.sub.24 -alkyl, unsubstituted or C.sub.1 -C.sub.18 -alkyl-substituted cycloalkyl or cycloalkylalkyl having 3 to 7 ring C atoms, C.sub.7 -C.sub.16 -aralkyl or C.sub.8 -C.sub.40 -alkaralkyl, where C.sub.1 -C.sub.24 alkyl may be substituted by --NR.sup.4 R.sup.5, --N.sup..sym. R.sup.4 R.sup.5 R.sup.6, --OR.sup.7, --SR.sup.7, --(C.sub.m H.sub.2m O).sub.n R.sup.8, --C(O)OR.sup.9 or C.sub.1 -C.sub.20 -acyloxy, in which R.sup.4, R.sup.5 and R.sup.6, independently of one another, are a hydrogen atom or unsubstituted or --OH-substituted C.sub.1 -C.sub.20 -alkyl, or R.sup.4 and R.sup.5 together are tetramethylene, pentamethylene or 3-oxapentylene, R.sup.7 is a hydrogen atom, linear or branched C.sub.1 -C.sub.18 -alkyl, unsubstituted or C.sub.1 -C.sub.12 -alkylsubstituted cyclohexyl, phenyl or benzyl, R.sup.8 is a hydrogen atom, C.sub.1 14 C.sub.18 -alkyl or C.sub.1 -C.sub.20 -acyl, and R.sup.9 is a hydrogen atom, the radical, reduced by one hydroxyl group, of a monohydric alcohol, a metal cation, or primary, secondary, tertiary or quaternary ammonium, m is an integer from 1 to 6, and n is a number from 1 to 20, R.sup.2 and R.sup.3, independently of one another, are a hydrogen atom or linear or branched C.sub.1 -C.sub.20 -alkyl, or R.sup.2 and R.sup.3 together are --C.sub.p H.sub.2p --in which p is an integer from 2 to 9. The compounds of the formula I are suitable as anti-wear agents and as high-pressure additives for lubricants and hydraulic fluids.

Lubricant additives containing sulfur

The invention relates to lubricant compositions containing

Growing community of inventors

Marly, Switzerland

Henri Dubas