Ciba Specialty Chemicals Corporation

Ciba-geigy Corporation

Alfa Wassermann S.p.a.

Basf Se Corporation

Alfa Farmaceutici S.p.a.

Basf Italia S.r.l.

Graziano Zagnoni

Dario Lazzari

Roberto Scrima

Stephen Mark Andrews

Alessandro Zedda

Mirko Rossi

Valerio Borzatta

Vincenzo Cannata

Manuele Vitali

Massimiliano Sala

David G Leppard

Graziano Vignali

Fabrizio Guizzardi

Giancarlo Tamerlani

Gianluca Ferri

Walter Fischer

Roland A Winter

James Peter Galbo

Michael H Ackerman

The present invention pertains to a reversible thermochromic system comprising a &#x3b2;-phenylvinylketone or a &#x3c9;-phenyl polyacetylenyl ketone with at least one acidic hydrogen and a base and to a reversible thermochromic composition comprising the reversible thermochromic system and a carrier material and to novel substituted &#x3b2;-phenylvinylketones or &#x3c9;-phenyl polyacetylenyl ketones with at least one acidic hydrogen.

Reversible thermochromic compositions

The present invention relates to highly compatible hydroxyphenyltriazine UV-absorbers and to their use in protecting plants in green houses and the protection of foodstuffs, beverages, pharmaceuticals, cosmetics, personal care products, shampoos and the like from the deleterious effects of ultraviolet radiation. It has been found that certain highly compatible tris-aryl-s-triazines are especially effective towards this end when incorporated in the containers or films in which such materials are stored.

Highly compatible hydroxyphenyltriazine UV-absorbers

A compound of the formula (IA) or (IB) wherein The compounds described above are useful for stabilizing an organic material against degradation induced by light, heat or oxidation.

Imidazolidinone derivatives

Piperazinone derivatives

A compound of the formula (I) wherein G, G, Gand Gare independently of one another C-Calkyl or C-Ccycloalkyl or the radicals Gand Gand the radicals Gand Gform independently of one another, together with the carbon atom they are attached to, C-Ccycloalkyl; R is hydrogen, C-Calkyl, oxyl, &#x2014;OH, &#x2014;CHCN, C-Calkenyl, C-Calkynyl, C-Cphenylalkyl unsubstituted or substituted on the phenyl radical by C-Calkyl and/or C-Calkoxy; C-Cacyl, C-Calkoxy, C-Chydroxyalkoxy, C-Calkenyloxy, C-Ccycloalkoxy, C-Cphenylalkoxy unsubstituted or substituted on the phenyl radical by C-Calkyl and/or C-Calkoxy; C-Calkanoyloxy, (C-Calkoxy)carbonyl, glycidyl or a group &#x2014;CHCH(OH)(G) with G being hydrogen, methyl or phenyl; n is 1, 2, 3 or 4; and X is an organic radical of a valency equal to n; and when n is 2, 3 or 4, each of the radicals G, G, G, Gand R can have the same or a different meaning in the units of the formula (II), is useful for stabilizing an organic material against degradation induced by light, heat or oxidation

Thioimidazolidine derivatives as light stabilizers for polymers

Compositions stabilized by dioxopiperazinyl derivatives

Oxopiperazinyl derivatives and light stabilized compositions

A compound of formula (I) wherein n is e.g. a number from 2 to 50; R &prime; and R &Prime; are e.g. a group of formula (II); G , G , G and G are e.g. C -C akyl; R is e.g. hydrogen or C -C alkyl; R is e.g. methylene; R &prime; is e.g. hydrogen and R &Prime; is e.g. hydrogen or C -C alkyl; R is e.g. C -C alkylene; and X is e.g. &mdash;N(R )R ) with R and R being independently of one another hydrogen or C -C alkyl, is useful for stabilizing an organic material against degradation induced by light, heat or oxidation.

Sterically hindered amine compounds

Novel process for the preparation of 2,2,6,6-tetramethyl-4-piperidyloxy-1,3,5-triazines, based on the reaction of cyanuric chloride with C.sub.1 -C.sub.4 alkanols or with sodium or potassium C.sub.1 -C.sub.4 alkoxides and subsequent reaction with 2,2,6,6-tetramethyl-4-piperidinols in the presence of a transesterification catalyst. The various reactions can be carried out in the same reactor, without isolation of the intermediates. ##STR1##

Process for the preparation of

The present invention relates to novel piperidine compounds of the formula (I) ##STR1## in which X.sub.1, X.sub.2, X.sub.3 and n are as defined in the text. The compounds of the invention can be used as light stabilizers, heat stabilizers and oxidation stabilizers for organic materials, in particular synthetic polymers.

Piperidine compounds for use as stabilizers for organic materials

Novel piperidine compounds of the formula (I) are suitable for use as light stabilizers, heat stabilizers and oxidation stabilizers for organic materials. The definitions of R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, A and n in the formula (I) are given in the text. ##STR1##

Piperidine-triazine compounds for use as light stabilizers, heat

The present invention relates to novel piperidine compounds of the formula (I) and to their use as light stabilizers, heat stabilizers and oxidation stabilizers for organic materials. The definitions of R.sub.1, R.sub.2 and R.sub.3 are given in the text. ##STR1##

Polyalkyl-4-piperidinol derivatives for use as stabilizers for organic

Novel piperidine compounds of the formula (I) ##STR1## in which R.sub.1 is e.g. hydrogen or methyl, n is e.g. 1 and A is e.g. --COR.sub.2 with R.sub.2 being C.sub.1 -C.sub.18 alkyl. The said compounds are effective as light stabilisers, heat stabilizers and oxidation stabilisers for organic materials.

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Vergato, Italy

Graziano Zagnoni