Patent ID: 6605658
Filing Date: 2003-08-12
Classification: C08K

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, optionally, (d) at least one compound belonging to the group of sterically hindered amines, said compounds belonging to the group of pyrazolones (a) being selected from those having general formula (I) or (II): â€ƒwherein R1 represents a hydrogen atom; a linear or branched C1-C18 alkyl group; a linear or branched C2-C18 alkenyl group; a linear or branched C2-C18 alkynyl group; a linear or branched C2-C8 alkoxyalkyl group; a C5-C8 cycloalkyl group; a heterocyclic group with 5 or 6 atoms containing at least one heteroatom selected from the group consisting of oxygen, nitrogen and sulfur, a C6-C20 aryl group; an amine group having general formula (III): or an acid or ester group having general formula (IV) or (V):â€”COOR9â€ƒâ€ƒ(IV): â€”CH2COOR10â€ƒâ€ƒ(V); wherein R2, R3, R4, R5 and R6, the same or different, each represents a hydrogen atom; a linear or branched C1-C18 alkyl group; a linear or branched C2-C18 alkynyl group; a linear or branched C2-C18 alkenyl group; a C5-C8 cycloalkyl group, or a C6-C20 aryl group; or, R2 and R3, considered jointly with the carbon atom to which they are bound, represent a C5-C8 cycloalkyl group; R7, R8, R9 and R10, the same or different, each represents a hydrogen atom; a linear or branched C1-C18 alkyl group; a C5-C8 cycloalkyl group; or a C6C20 aryl group; or, R7 and R8, considered jointly with the nitrogen atom to which they are bound, represent a heterocyclic group with 5 or 6 atoms optionally containing another heteroatom selected from oxygen, nitrogen or sulfur.