Abstract: A chain drive for a link chain of mining conveyors or mining extraction machines, in particular for scraper chain conveyors, includes a drive shaft. The drive power or the drive torque is introduced into the link chain by chain tooth elements. The chain tooth elements are set directly in the drive shaft in seats. For that purpose, the chain tooth elements have a lower coupling portion for interlocking engagement in the seats in the drive shaft. Accordingly, a separate chain wheel is unnecessary.

Abstract: The invention relates to a chain drive (1) for link chains (2) of mining conveyors or mining extraction machines, in particular for scraper chain conveyors. The chain drive (1) comprises a drive shaft (3). The drive power or the drive torque is delivered to the link chain (2) by sprocket tooth bodies (4). According to the invention, the sprocket tooth bodies (4) are set directly into the drive shaft (3) in seats (6). For that purpose, the sprocket tooth bodies (4) have a lower coupling section (8) for interlocking engagement in the seats (6) in the drive shaft (3). According to the invention, a separate sprocket is no longer necessary.

Abstract: 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.

Abstract: 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.

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

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

Abstract: 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° 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° C.

Abstract: An artificial tooth of plastic or ceramic material. The artificial tooth has a tooth body comprising an internal solid core (1) and at least one external layer (2) formed by injection molding and enveloping the solid core (1) at least in part.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.