Clariant Finance (bvi) Limited

Sandoz Gmbh

Karl Bechtold

Rainer Wolf

Gilbert Ligner

Lajos Avar

The present invention relates to the use of a photoreactive and UV absorbing piperidine compound of the formula A below and of a mixture consisting of this piperidine compound and at least one selected UV absorber as light stabilizers in coating materials, preferably in automotive coating materials.

Paint stabilizer

Stabilizer composition

A composition, suitable for stabilizing a polymeric composition against the effects of light, comprising

Mixtures of HALS compounds

New powder coatings or powder coating compositions comprising A) a binder system B) specific powder coating additives C) at least one compound of formula I ##STR1## in which R.sub.1 is methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl or tert-butyl and optionally D) additional compounds selected from the group consisting of antioxidants, UV-stabilizers, UV-absorbers, acid scavengers, radical scavengers, pigments, dyes, UV-quenchers, processing stabilizers, fillers, and tribocharging additives exibit advantages during their production. Compounds according to formula I can be used as UV-absorbers and can be incorporated even in greater amounts and dispersed homogeneously at the manufacture of the powder coating compositions in an extruder. It is a further advantage of these compounds that they do not volatilize during stoving of the coatings.

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Schliengen, Germany

Karl Bechtold