Enichem Synthesis S.p.a

Great Lakes Chemical (Europe) Gmbh

Great Lakes Chemical Italia S.r.l.

Ministero Dell'universita E Della Ricerca Scientifica E Tecnologica

Ministero Dell 'Universita'e Della Ricerca Scientifica E Technologica

Luciana Crisci

Pietro Allegrini

Vincenzo Malatesta

Nereo Nodari

William Giroldini

Carlo Neri

Fiorenzo Renzi

Graziano Castaldi

Franco Rivetti

Fabio Broussard

Carlo Busetto

Antonio Rinaldi

Mauro Adovasio

Maria Lucia Wis

Nicola Casilli

Photochromatic compounds belonging to the groups of chromenes and spiro-pyrans having general formula (I) 

Photochromatic pyrano-1,3-oxazinonaphthalene derivatives

Photochromatic compounds, process for their preparation and their use in polymeric materials

Compounds belonging to the group of enamines consisting of derivatives of &bgr;-keto-esters or &bgr;-keto-amides or 1,3-diketones with primary or secondary aliphatic or aromatic amines carrying at least one sterically hindered amine group having general formula (I) in the molecule. The compounds having general formula (I) can be used as antioxidants or light stabilizers for organic polymers.

Light-stabilized organic polymers

A description follows of photochromatic and thermochromatic compounds, belonging to the group of spiro-indoline-oxazines, and their application in polymeric materials.

Photochromatic and thermochromatic compounds and their application in

Polymeric compositions comprising a polymer and photochromic compounds belonging to the class of spiro-pyrans, having the general formula (I): ##STR1##

Spiro-pyranic compounds endowed with photochromic characteristics

Photochromic products belonging to the group of chromenes having general formula (I): ##STR1##

Photochromic products and method for their preparation

Photochromic compounds belonging to the class of spiro-pyrans, having the general formula (I): ##STR1##

Stabilizing mixture for photochromatic substances containing a cyclic amine chosen from 1,4-diazabicyclo-(2.2.2)octane and quinuclidine, or their derivatives, and at least one sterically hindered amine.

Stabilizing mixture for compounds having a photochromatic activity

A photochromatic composition, endowed with a high light fatigue resistance contains a photochromatic compound belonging to the class of spirooxazines and an U.V.-stabilizer consisting of a sterically hindered amine to be defined by means of formula (I): ##STR1## wherein: R is either hydrogen or a methyl group,

Photochromatic composition endowed with light fatigue resistance and

A photochromatic compound represented by the following general formula (I): ##STR1## where: R.sub.1 and R.sub.2 independently represent a linear, branched or cyclic C1-C10 alkyl radical, H, OH, F, Cl, Br, NH.sub.2, N(R.sub.4).sub.2, COOH, OR.sub.4 or COOR.sub.4 where R.sub.4 is a C1-C10 linear, branched or cyclic alkyl radical, or an aryl radical;

Photochromatic compound, a method for its preparation, and articles

New compounds of the spiro-indoline-oxazine class possessing photochromatic and photosensitizing charecteristics are definable by the general formula (I): ##STR1## where the substituents R, R.sup.1 -R.sup.7 and A are as defined in the description. The process for preparing the compounds (I) is described, as is their use as photochromic agents able to confer photochromatic characteristics on the articles in which they are incorporated, and as photosensitizing agents.

Spiro-indoline oxazine compounds with photochromatic and

A photochromatic composition contains at least two photochromatic compounds, defined by the general formula: ##STR1## wherein the various substituents from R.sub.1 to R.sub.7 and X are as defined in the specification. In such a mixture, at least one photochromatic compound is defined by the general formula, wherein R.sub.7 represents a hydrogen atom, and at least one further compound is also defined by the general formula, wherein R.sub.7 represents an -NR.sub.8 R.sub.9, with R.sub.8 and R.sub.9 having the meaning as defined in the text.

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Luciana Crisci