Bayer Aktiengesellschaft

Ciba Specialty Chemicals Corporation

Merck Patent Gesellschaft MIT Beschrankter Haftung

Siemens Aktiengesellschaft

Dietrich Braun

Rudolf Pfaendner

Helmut Wahlig

Thomas Wannemacher

Harald Pielartzik

Hanns-Peter Muller

Leo Morbitzer

Helmut-Martin Meier

Wolfgang Von Gentzkow

Elvira Dingeldein

Alex Wegmann

Arnd-Peter Rudolf

Klaus Titzschkau

Elvira Dingeldain

The present invention relates to a process and composition for the chain stopping of vinyl chloride polymerization or copolymerization in the presence of a stable free nitroxyl radical and a phenolic antioxidant. A further subject of the invention is the use of a stable free nitroxyl radical together with a phenolic antioxidant as a chain stopping mixture for the vinyl chloride polymerization or copolymerization. A further aspect of the invention is the use of higher sterically hindered nitroxyl radicals alone as chain stopping agents for the vinyl chloride polymerization.

Process for chain stopping of PVC polymerization

The present invention pertains to a process for controlled free radical polymerization or copolymerization of vinyl chloride at a temperature between 40&#xb0; C. and 95&#xb0; C., at a pressure between 5 and 30 bar in the presence of a stable free nitroxyl radical.

(CO)polymerization of vinyl chloride in the presence of a stable nitroxyl radical

A process for the feedstock recycling of thermoset materials treats the material with a partially hydrogenated aromatic hydrocarbon at a temperature of from 200 to 350&deg; C. in the presence of an amine. In the case of epoxy resin materials an amine is not needed if processing is carried out at temperatures of from 300 to 350&deg; C.

Process for recycling of thermoset materials

The new bisesters of unsaturated carboxylic acids corresponding to the following formula ##STR1## may be used in curable polyester resin mixtures which may in turn be used for the production of moldings. The curable mixtures obtainable from the new bisesters of unsaturated carboxylic acids show a higher glass transition temperature than normal polyester resins and, despite a higher crosslink density, show broader-mesh crosslinking.

Bisesters of unsaturated carboxylic acids, their production and their

A shaped mass resorbable in the body, comprises collagen and a bioresorbable binding agent for collagen, the binding agent being selected, e.g., from polymers of C.sub.2-16 .alpha.-hydroxyalkanoic acids, polymers of natural amino acids, hydrolyzed collagen or hydrolyzed elastin.

Medicinally useful, shaped mass of collagen resorbable in the body

Reactive oligomers obtainable by reacting .alpha.-substituted acrylic acid derivatives and tetra-aryl succinic acid dinitriles do excellently work as non-peroxidic initiators for curing radically polymerizable compounds and compositions, particularly unsaturated polyester resins.

Reactive oligomers as curing agent for unsaturated polyester

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Darmstadt, Germany

Dietrich Braun