Ciba Specialty Chemicals Corporation

Ciba-geigy Corporation

Thomas Schmutz

Bruno Rotzinger

Martin Brunner

Werner Stauffer

Hans Zweifel

Erich Kramer

Polyolefin mouldings which have excellent stability on permanent contact with extracting media comprise, as stabilizers, a selected mixture comprising an organic phosphite or phosphonite and a specially selected group of sterically hindered phenols or a certain group of sterically hindered amines. In addition, a selected three-component mixture comprising a phosphite or phosphonite, a phenolic antioxidant and a certain group of sterically hindered amines is particularly suitable as stabilizer for polyolefin moldings which are in permanent contact with extracting media.

Process for stabilization of polyolefins in permanent contact with extracting media

A process is described for the preparation of olefin polymers by polymerization over a transition metallocene catalyst with the addition of at least one phosphorus(III) compound, sterically hindered amine, sterically hindered phenol or acid scavenger, alone or in combination with one another; the polymers which can be obtained in this way are of outstanding stability.

Process for the preparation of stabilized olefin polymers

The invention relates to a process for the preparation of olefin polymers by polymerization using a transition metal catalyst with the addition of an aminoalkyl-1,1'-biphenyl-2,2'-diylphosphite or aminoalkyl-2,2'-alkylidene-bis(phenyl)phosphite, in conjunction with optional further modifiers. The polymers obtainable in this manner have excellent long-term stability.

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Riehen, Switzerland

Thomas Schmutz