Enichem Synthesis S.p.a

Great Lakes Chemical (europe) Gmbh

Enichem Sintesi S.p.a.

Great Lakes Chemical Italia S.r.l.

Consiglio Nazionale Delle Ricerche

Brichima, S.p.a.

Enicham Synthesis

Luciano Pallini

Carlo Neri

Silvestro Costanzi

Damiano Gussoni

Daniele Fabbri

Giovanni Sandre

Rossella Farris

Alberto Greco

Attilio Citterio

Francesco Minisci

Elena Vismara

Silvia De Bernardinis

Mariano Correale

Omero Zavattini, Deceased

Marco Bizzarri

By Clara Pungiluppi, Heir

By Renato Zavattini, Heir

Francesco Groppelli

Crystalline modification of mixtures comprising (a) a nickel-quencher corresponding to &lsqb;2,2&prime;-thio-bis(4-t-octylphenolate)-n-butylamine Nickel (II)&rsqb; and (b) a 2-hydroxy-4-alkyloxybenzophenone corresponding to 2-hydroxy-4-n-octyloxybenzophenone wherein it has two diffraction lines at angles 2{acute over (&oslash;)}&equals;6.291 and 2{acute over (&oslash;)}&equals;6.888 in the X-Ray diffraction spectrum from powders. The said crystalline modification can be used as a light stabilizer for agricultural films based on polyolefins or polyolefinic copolymers.

Crystalline modification of mixtures of a nickel-quencher and a benzophenone and process for its preparation

Granular form of a mixture comprising: (a) a nickel-quencher corresponding to &lsqb;2,2&prime;-thio-bis(4-t-octyl-phenolate)-n-butylamine Nickel (II)&rsqb;; (b) a 2-hydroxy-4-alkyloxybenzophenone corresponding to 2-hydroxy-4-n-octyloxybenzophenone; characterized in that it has two diffraction lines at angles 2&thgr;&equals;17.593 and 2&thgr;&equals;22.023 in the X-Ray diffraction spectrum from powders. The above granular form can be used as a light stabilizer for agricultural films based on polyolefins or olefinic copolymers.

Granular form of a mixture of a nickel-quencher and a benzophenone and process for its preparation

Solid form of a stabilizer for organic polymers consisting of one or more tocopherols, as such or in formulation, absorbed on porous polypropylene with a high crystallinity, in a quantity ranging from 30% to 85% by weight. The above tocopherols, as such or in formulation, can also be used in a mixture with other stabilizers such as, for example, secondary antioxidants containing phosphorous or sulfur, sterically hindered phenols and sterically hindered amines.

Stabilizer in solid form for organic polymers

Tetrakis-(2,4-di-t-butylphenyl) -4,4'-biphenylene diphosphonite having the formula: ##STR1## in crystalline form, having a melting point of 185.degree. C.-186.degree. C. The above diphosphonite is useful as a stabilizer in organic polymers.

Crystalline form of tetrakis-(2,4-di-t-butylphenyl)-4,4'-biphenylene

Process for obtaining granular forms, from mixtures of powders of two or more additives for organic polymers, including extruding the mixture at a temperature of between about the melting point of the component with the lowest melting point and 140.degree. C., with the condition that, when the mixture consists of two additives, these are not tetrakis �3-(3,5-di-t-butyl-4-hydroxyphenyl) propionyloxymethyl!methane, either in an amorphous or crystalline form, and an antiacid.

Process for obtaining granular forms of additives for organic polymers

Stabilizers for organic polymers, consisting of one or more compounds of the classis of the sterically hindered amines (HALS) are directly added to the reaction mixture during the (co)polymerization of the .alpha.-olefins or of their mixtures with other unsaturated monomers. The so-obtained polymeric compositions result perfectly stabilized and show a thermo- and photo-oxidative resistance higher than that of the same polymeric compositions to which the same stabilizers are added by a traditional route.

Process of (co)polymerization of .alpha.-olefins in the presence of

Polymeric stabilizers with a polysiloxanic structure contain sterically hindered phenol groups and reactive groups capable of binding themselves to the polymeric structure to be stabilized. These polymeric stabilizers are particularly suitable for applications which require the non-extractability of additives due to solvents, fats or soaps.

Polysiloxanic stabilizers containing sterically hindered phenol groups

Polysiloxanic compounds, containing sterically hindered phenol groups and oxamidic groups in the molecule, obtained by the copolymerization of monomers having general formula (I):

Polysiloxanic stabilizers containing sterically hindered phenol group

A process is disclosed for the synthesis of 4-allyloxy-2,2,6,6-tetraalkylpiperidinic derivatives by starting from the corresponding 2,2,6,6-tetraaLkyLpiperidinols and from an allyl halide, characterized in that the reaction is made to take place in the absence of water, and in the presence of a finely subdivided allyl-metal hydroxide and of small amounts of a phase-transfer catalyst. The products, which are thus obtained with yields higher than 90%, are useful a stabilizers for polymers or as intermediates for such products.

Process for the synthesis of allylated derivatives of

Oxamidic stabilizers containing organofunctional groups of silicon, capable of producing polymeric structures or of chemically binding themselves to a solid support.

Oxamidic stabilizers

Process for obtaining granular forms of organic and inorganic antiacid additives and tetrakis-[3-(3,5-di-tert.-butyl-4-hydroxyphenyl)-propionyloxymethyl]-metha ne, carried out in the presence of an amount of the latter in the molten state, homogeneously distributed throughout the powder mass.

Phenols are oxidated to quinones with hydrogen peroxide in the presence of catalytic amounts of bromine, iodine, hydrogen bromide and hydrogen iodide.

Process for the preparation of quinones

Stabilizers for organic polymers are disclosed, of the type of sterically hindered phenols or amines, which are obtained by means of the reaction of a sterically hindered phenol or amine bearing in the molecule at least in alkoxysilanol group with a mono- or poly-hydroxy aliphatic alcohol, by a transesterification reaction. The stabilizers so obtained are compatible with the organic polymers, wherein they remain stably.

Process for the preparation of stabilizers for organic polymers

Reactive stabilizer compounds, to be used in the stabilization of organic polymers, contain a sterically hindered, N-substituted piperidinic, morpholinic or pyrrolidinic group, and at least a hydrolysable silicic function. Such compounds give rise, by hydrolysis of the silicic function, to complex resinous structures endowed with stabilizing properties. The reactive stabilizer compounds can spontaneously hydrolyse inside the polymer, or they can be stably supported on a solid support, or they can be chemically linked to the polymeric chain to be stabilized.

Growing community of inventors

San Donato Milanese, Italy

Luciano Pallini