Ciba-geigy Corporation

Klaus Muller

Hermann O Wirth

Michael Rasberger

Hans-Helmut Friedrich

Rolf Schumacher

Ulrich Kristen

Helmut Prestel

A lubricant oil composition comprising a diesel engine lubricating oil and, as antioxidant, a compound of formula I ##STR1## wherein R.sup.1 and R.sup.2 are each independently of the other C.sub.1 -C.sub.12 alkyl

Stabilized diesel engine oil

Novel salts of methylphosphonic acid with primary amines are described. These compounds are preferably used as extreme pressure additives in lubricant compositions.

Lubricants containing ammonium salts of methylphosphonic acid

Hologenated 2-(2-hydroxyphenyl)-2H-benzotriazoles of the formula ##STR1## in which X is halogen, R.sub.1 is hydrogen, C.sub.1 -C.sub.12 alkyl, C.sub.5 -C.sub.6 cycloalkyl, phenyl or phenyl-C.sub.1 -C.sub.4 alkyl and R.sub.2 is C.sub.1 -C.sub.12 alkyl, C.sub.5 -C.sub.6 cycloalkyl, phenyl, phenyl-C.sub.1 -C.sub.4 alkyl or a group --C.sub.n H.sub.2n --COOR.sub.3, in which n is 0 to 4 and R.sub.3 is hydrogen or C.sub.1 -C.sub.12 alkyl, can be prepared particularly advantageously by catalytic hydrogenation of a corresponding o-nitroazo compound in the presence of a hydrogenation catalyst consisting of 0.1 to 3% of Pt on a support and of an organic amine.

Process for the preparation of benzotriazole derivatives

Methylphosphonic acid amine salt lubricant additives

Compounds of formula I ##STR1## wherein R and R.sup.1 are identical or different and are a radical of the formula ##STR2## where R.sup.2, R.sup.3 and R.sup.4 are each independently C.sub.1 -C.sub.18 alkyl and together contain not more than 22 carbon atoms, and R.sup.3 and R.sup.4 are also hydrogen, or wherein R and R.sup.1 are C.sub.5 -C.sub.6 cycloalkyl, unsubstituted or C.sub.1 -C.sub.4 alkyl-substituted phenyl, or naphthyl, C.sub.7 -C.sub.14 aralyl, furfuryl or thienyl, and wherein Y is --S--, --O--, --NH--, --N(C.sub.1 -C.sub.12 alkyl)--, --CH.sub.2 --, --CH(C.sub.1 -C.sub.12 alkyl)-- or --C(C.sub.1 -C.sub.12 alkyl).sub.2 -- and X.sup..sym. is 1 equivalent of a metallic cation selected from the group consisting of Li.sup..sym., Na.sup..sym., K.sup..sym., Mg.sup.2.sym., Ca.sup.2.sym., Ba.sup.2.sym., Zn.sup.2.sym., Mn.sup.2.sym., Ni.sup.2.sym., Fe.sup.3.sym., Fe.sup.2.sym., Co.sup.2.sym., Cu.sup.2.sym., Al.sup.3.sym., Cr.sup.3.sym., VO.sup. 3.sym., ZrO.sup.2.sym., MoO.sub.2.sup.2.sym. and TiO.sup.2.sym., are suitable as additives for lubricants and hydraulic oils and bring about an improvement in the extreme-pressure properties and in the anti-wear properties.

Boric acid complexes

Compounds of the formula I ##STR1## wherein R and R.sup.1 are identical or different, and are cyclohexyl or a radical ##STR2## in which R.sup.2 is hydrogen or C.sub.1 -C.sub.12 -alkyl, and R.sup.3 and R.sup.4 independently of one another are each C.sub.1 -C.sub.12 -alkyl, and the radicals R.sup.2, R.sup.3 and R.sup.4 together contain 3-20 C atoms. These compounds are suitable as high-pressure and anti-wear additives for lubricants and hydraulic fluids.

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Lorrach, Germany

Klaus Muller