Enichem Synthesis S.p.a

Great Lakes Chemical (Europe) Gmbh

Eniricerche S.p.a.

William Giroldini

Antonio Rinaldi

Carlo Neri

Gianluigi Landoni

Luciana Crisci

Vincenzo Malatesta

Maria Lucia Wis

Neri Carlo

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

Poly(Pentaerythrityl diphosphonate) of formula (I): ##STR1## wherein n is an integer having a value comprised within the range of from 3 to 100. The poly(pentaerythrityl diphosphonate) of formula (I) is useful as a flame retardant additive for thermoplastic polymers.

Poly(pentaerythrityl diphosphonate) and its use in self-extinguishing

A new group of pentaerythryl diphosphonates and poly(pentaerythryl diphosphonates) are described. Flame-retardant compositions are also described, which include a thermoplastic polymer and a certain amount of self-extinguishing agent consisting of one of the above-mentioned pentaerythryl diphosphonates or poly(pentaerythryl diphosphonates).

New pentaerythryl phosphonates containing self-extinguishing

Pentaerythryl phosphonates and their use in self-extinguishing

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

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San Donato Milanese, Italy

William Giroldini