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: The present invention relates to vulcanization accelerators constituted by compounds, derived from secondary amines, belonging to the class of enamines and to a process for their preparation.

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: The present invention relates to vulcanization accelerators constituted by compounds, derived from secondary amines, belonging to the class of enamines and to a process for their preparation.

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: 1

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: 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.

Abstract: Vulcanization accelerators consisting of compounds belonging to the group of enamines having general formula (I):

Abstract: Vulcanization accelerators constituted by compounds belonging to the class of dihydropyridines having the general formula (I): ##STR1## and their use in natural or synthetic rubbers.

Abstract: The present invention relates to vulcanization accelerators constituted by compounds, derived from secondary amines, belonging to the class of enamines and to a process for their preparation.

Abstract: Stabilizing compositions for organic polymers, composed of mixtures of at least one liquid phenolic antioxidant and at least one aminic antioxidant, subjected to thermal treatment, are characterized by their stabilizing capacity which is considerably higher than that of either single components or of corresponding untreated mixtures.These stabilizing compositions can be used in all field where the single components of the mixtures are generally used and, preferably, in the stabilization of organic polymers normally subject to deterioration due to oxidation processes.

Abstract: Organic compounds of phenolic nature for stabilizing organic polymers are described together with the process for preparing said stabilizing compounds. Stabilized polymer compositions incorporating said stabilizing compounds are also described.