Ciba-geigy Corporation

Witco Vinyl Additives Gmbh

Ciba Specialty Chemicals Corporation

Crompton Vinyl Additives Gmbh

Rolf Drewes

Wolfgang Wehner

Hans-Helmut Friedrich

Karl Josef Kuhn

Markus Kolb

Kornelia Malzacher

Hans-Ludwig Mehner

Hans-Jurgen Sander

Rudolf Pfaendner

Heinz Herbst

Kurt Hoffmann

Walter Wecht

Bernd Braun

Hans-J Urgen Sander

Stabilized halogen-containing polymers

Stabiliser combinations for chlorine-containing polymers

A description is given of compounds of the general formula I

NH2-modified 6-aminouracils as stabilizers for halogenated polymers

The invention relates to compositions comprising

Pyrrolodiazine derivatives as stabilizers for chilorine-containing

Stabilized polyvinyl chloride containing recycled material

A stabilizer combination, mainly for PVC, is described, comprising

Stabilizer combinations for chlorine-containing polymers

Rigid PVC stabilised with N,N-dimethyl-6-aminouracils

Pyrrolodiazine derivatives as stabilizers for chlorine-containing

A high degree of stabilization of flexible PVC is achieved by using a perchlorate and a terminal epoxide compound.

Stabilized flexible PVC

Use of a di- or polysaccharide alcohol and an inorganic or organic zinc, aluminum or rare-earth compound allows a high degree of stabilization of a halogen-containing polymer or polymer recyclate.

A high degree of stabilization of polyvinyl chloride is achieved by using a perchlorate, a terminal epoxide compound and an antioxidant.

Stabilized polyvinyl chloride

Use of an inorganic or organic zinc compound and a terminal epoxide compound, optionally with chalk, gives a high level of stabilization of PVC.

There is disclosed a process for the preparation of 1,3-diketones of formula I ##STR1## wherein R.sub.1 and R.sub.2 are each independently of the other C.sub.1 -C.sub.20 alkyl, phenyl or phenyl which is substituted by halogen, hydroxy, NO.sub.2, C.sub.1 -C.sub.4 alkyl and/or C.sub.1 -C.sub.4 alkoxy, C.sub.7 -C.sub.9 phenylalkyl or a radical of formula II

Process for the preparation of linear 1,3-diketones

There is disclosed a process for the preparation of an alpha-aminoketone salt of formula I ##STR1## which comprises reacting a nitrosated keto ester of formula II ##STR2## with a carboxylic anhydride of formula IV ##STR3## under the conditions of catalytic hydrogenation, to a compound of formula III ##STR4## which compound of formula III is then hydrolysed with an acid H.sub.n A to the salt I, in which formulae above R.sub.1 is C.sub.1 -C.sub.6 alkyl, phenoxy-C.sub.1 -C.sub.4 alkyl, phenyl, C.sub.7 -C.sub.9 phenylalkyl, or phenyl or C.sub.7 -C.sub.9 phenylalkyl which are substituted by halogen, C.sub.1 -C.sub.6 alkyl or C.sub.1 -C.sub.6 alkoxy, hydroxy or cyano, R.sub.2 is C.sub.1 -C.sub.4 alkyl or cyclohexyl, n is 1 to 3, R.sub.3 is C.sub.1 -C.sub.4 alkyl and A is the radical of an organic or mineral protic acid. Pyrroles suitable as co-stabilisers for PVC can be prepared from alpha-aminoketone salts of formula I.

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Lindenfels, Germany

Rolf Drewes