Abstract: Mixtures of additives in granular form comprising: one or more stabilizers for organic polymers; one or more organic or inorganic pigments; and/or one or more dyes; obtained by extrusion at a temperature capable of enabling the partial or total melting of the lowest-melting component. The above mixtures can be used in the stabilization and dyeing of organic polymers.

Abstract: A transesterification process for the preparation of tetrakis [3-(3,5-di-tert-butyl-4-hydroxy phenyl)propionyl oxymethyl] methane by the reaction of methyl-(3,5-di-tert-butyl-4-hydroxy phenyl)propionate ester with pentaerythritol wherein the reaction takes place in the presence of an ester exchange catalyst combination consisting of (a) at least one basic or neutral catalyst and (b) at least one metal compound capable of behaving as a Lewis acid and wherein the reaction is conducted through a first stage in which only basic or neutral catalyst is present in the reaction mixture followed by a second stage which commences with the addition of Lewis acid catalyst to the reaction mixture when the amount of di-substituted intermediate product contained within the reaction mixture is less than 20 area % analyzed by HPLC. The preferred basic catalysts are lithium hydroxide and lithium hydroxide monohydrate. The preferred Lewis acid catalyst is zinc octanoate.

Abstract: Liquid stabilizing mixtures for organic polymers comprising: a) a liquid compound belonging to the group of sterically hindered phenols consisting of esters or mixtures of esters having formula (I); b) a solid compound belonging to the group of sterically hindered phenols having formula (II).

Abstract: Mixtures of additives in granular form comprising: one or more stabilizers for organic polymers; one or more organic or inorganic pigments; and/or one or more dyes; obtained by extrusion at a temperature capable of enabling the partial or total melting of the lowest-melting component. The above mixtures can be used in the stabilization and dyeing of organic polymers.

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

Abstract: Liquid stabilizing mixtures for organic polymers comprising: a) a liquid compound belonging to the group of sterically hindered phenols consisting of esters or mixtures of esters having formula (I); b) a solid compound belonging to the group of sterically hindered phenols having formula (II).

Abstract: Liquid composition which can be polymerized into organic glasses, by means of radical polymerization with low shrinkage, comprising the product obtained from the trans-esterification of a diallycarbonate (A) with a mixture of one or more linear or branched aliphatic diols (B), containing from three to ten carbon atoms in the molecule, with a linear or branched aliphatic polyol (C), containing from four to twenty carbon atoms and from three to six hydroxyl groups in the molecule. The molar ratio A/(B+C) in the above polymerizable liquid composition ranges from 2/1 to 5/1 and the quantity of (C) in the mixture (B+C) is equal to or less than 25% by weight with respect to the total weight of this mixture.

Abstract: Liquid composition polymerizable, by means of radicalic polymerization, into organic glass, comprising the product obtained from the transesterification of a mixture of diallyl carbonate (A) and a phthalic ester (B), with one or more polyols (C), linear or branced, containing from two to eight carbon atoms in the molecule.

Abstract: Crystalline modification of mixtures comprising (a) a nickel-quencher corresponding to [2,2′-thio-bis(4-t-octylphenolate)-n-butylamine Nickel (II)] 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 (ø)}=6.291 and 2{acute over (ø)}=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.

Abstract: Stabilizing mixtures for organic polymers comprising: a) at least one compound belonging to the group of pyrazolones; b) at least one compound belonging to the group of organic phosphites or phosphonites; c) at least one compound belonging to the group of sterically hindered phenols; and d) at least one compound belonging to the group of sterically hindered amines. The above mixtures are useful in the stabilization to degradation caused by oxygen, heat and/or light, of organic polymers.

Abstract: Process for the preparation of symmetrical diacylhydrazines having general formula (I): R1—CO—NH—NH—CO—R1 wherein R1 represents a linear or branched C1-C18 alkyl group; a linear or branched C2-C8 alkoxyalkyl group; a C2-C8 cyanoalkyl group; a C5-C8 cycloalkyl group, said cycloalkyl group optionally containing a heteroatom selected from oxygen, nitrogen and sulfur; a C6-C18 aryl group; a C7C20 arylalkyl group or alkylaryl group, said arylalkyl or alkylaryl groups optionally substituted with one or more hydroxyl groups, or with one or more linear or branched C1-C8 alkoxyl groups; comprising: (a) reacting an ester of a carboxylic acid having general formula (II): R1—CO—OR2 wherein R1 has the same meanings defined above and R2 represents a linear or branched C1-C18 alkyl group, with hydrazine, in its pure or hydrated state, obtaining a monoacylhydrazine having general formula (III): R1—CO—NH—NH2; (b) reacting the monoacylhydrazine having general formula

Abstract: Photochromic compounds belonging to the group of spiro-isoindolino-oxazines having general formula (I). The above photochromatic compounds having general formula (I) have excellent photochromic characteristics, excellent stress resistance and high dyability characteristics.

Abstract: 2-(2′-hydroxyphenyl)benzotriazoles having general formula (I). The above 2-(2′-hydroxyphenyl)benzotriazoles are useful as light stabilizers for organic polymers.

Abstract: Granular form of a mixture comprising: (a) a nickel-quencher corresponding to [2,2′-thio-bis(4-t-octyl-phenolate)-n-butylamine Nickel (II)]; (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;=17.593 and 2&thgr;=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.

Abstract: 2-(2′-hydroxyphenyl)benzotriazoles having general formula (I): The above 2-(2′-hydroxyphenyl)benzotriazoles can be used as light stabilizers for organic polymers.

Abstract: The invention relates to a polymeric composition comprising at least one engineering polymer and at least one phosphate ester flame retardant additive which is characterized in that the phosphate ester is a mixed tri (tertiary butylphenyl) phosphate ester which comprises from 1 to 45% by weight of tri (tertiary butylphenyl) phosphate; from 10 to 55% by weight of di tertiary butylphenyl mono phenyl phosphate; from 10 to 60% by weight of mono tertiary butylphenyl diphenyl phosphate and less than 10% by weight of triphenyl phosphate.

Abstract: 2-(2'-hydroxyphenyl)benzotriazoles having general formula (I): ##STR1## The above 2-(2'-hydroxyphenyl)benzotriazoles can be used as light stabilizers for organic polymers.

Abstract: 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.