Ciba-geigy Corporation

Ciba Specialty Chemicals Corporation

Werner Stauffer

Rolf Schmid

Peter Nesvadba

Alfred Steinmann

Martin Brunner

Bruno Rotzinger

Thomas Schmutz

Michael Fischer

Andreas Kramer

Helmut Zondler

Gerhard Rytz

Bernard Gilg

Margot Clauss

Michael Roth

Alfred Renner

Friedrich Stockinger

Abdul-Cader Zahir

Andreas M&uuml;hlebach

Polymeric stabilizers having low polydispersity

Polymerizable compositions containing alkoxyamine compounds derived from nitroso- or nitrone compounds

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.

ABS copolymers and similar styrene or .alpha.-methylstyrene copolymers which contain an elastomer phase are stabilized against light-induced degradation by a) incorporation of a copolymerizable sterically hindered amine in, and b) addition of a non-copolymerizable sterically hindered amine to, the copolymer. Preferred sterically hindered amines are polyalkylpiperidines.

Process for the preparation of stabilized styrene copolymers containing

ABS copolymers and similar styrene or .alpha.-methylstyrene copolymers with contain an elastomer phase are stabilized against light-induced degradation by a) incorporation of a copolymerizable sterically hindered amine in, and b) addition of a non-copolymerizable sterically hindered amine to, the copolymer. Preferred sterically hindered amines are polyalkylpiperidines.

Stabilized styrene copolymers containing elastomer particles modified

The invention relates to curable compositions comprising

Curable composition of polyether sulfone or polyether ketone copolymer

Storage-stable heat-curable mixtures are described which contain

Mixtures containing polymides alkenyphenols and either epoxide

There are described novel imidazolides (N-acylimidazoles) of the formula I ##STR1## wherein R.sub.1 is methyl, ethyl or isopropyl,

Novel imidazolides and their use as curing agents for polyepoxide

Heat-curable mixtures, containing (a) an epoxide resin having on average more than one epoxide group in the molecule, (b) an allyl-substituted or methallyl-substituted imide of the formula I ##STR1## in which E is allyl or methallyl, G is hydrogen or methyl, n is 1 or 2, and R is hydrogen, alkyl, alkenyl, cycloalkyl, aryl, benzyl or arylene, and (c) a curing catalyst, have good storage stability and processability and produce moulded materials having high mechanical strength values and good resistance to heat.

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Fribourg, Switzerland

Werner Stauffer