Abstract: The present invention relates to a polyoxymethylene molding composition comprising (A) 0.1-5.0% by weight of colorant, (B) 0.01-0.5% by weight of a nitrogen-containing stabilizer, (C) 0.05-1% by weight of an ester of a polyhydric alcohol and at least one fatty acid, and (D) 0.001-0.5% by weight of a metal salt of a fatty acid, and (I) polyoxymethylene polymer and, where appropriate, up to 40% by weight of other conventional additives, and variants of this constitution in advantageous versions. In the case of these polyoxymethylene molding compositions the selection of the colorants is no longer restricted to conventional colorants suitable particularly for POM. The products produced therewith are particularly stable during processing and feature low formaldehyde emission, defect-free surfaces, and high color fastness.

Abstract: The invention relates to a process for preparation of polymer blends comprising at least one polyoxymethylene and at least one thermoplastic elastomer, where the thermoplastic elastomer is micropelletized by a pelletizing process and the pellets obtained in a) are dispersed in the polyoxymethylene matrix via melting of the components and mixing of these at low shear forces, and also to the use of micropelletized thermoplastic elastomers for preparation of polyoxymethylenes with low formaldehyde emission.

Abstract: The present invention relates to a polyoxymethylene molding composition comprising (A) 0.1-5.0% by weight of colorant, (B) 0.01-0.5% by weight of a nitrogen-containing stabilizer, (C) 0.05-1% by weight of an ester of a polyhydric alcohol and at least one fatty acid, and (D) 0.001-0.5% by weight of a metal salt of a fatty acid, and (I) polyoxymethylene polymer and, where appropriate, up to 40% by weight of other conventional additives, and variants of this constitution in advantageous versions. In the case of these polyoxymethylene molding compositions the selection of the colorants is no longer restricted to conventional colorants suitable particularly for POM. The products produced therewith are particularly stable during processing and feature low formaldehyde emission, defect-free surfaces, and high color fastness.

Abstract: The invention relates to a process for preparation of polymer blends comprising at least one polyoxymethylene and at least one thermoplastic elastomer, where the thermoplastic elastomer is micropelletized by a pelletizing process and the pellets obtained in a) are dispersed in the polyoxymethylene matrix via melting of the components and mixing of these at low shear forces, and also to the use of micropelletized thermoplastic elastomers for preparation of polyoxymethylenes with low formaldehyde emission.

Abstract: The present invention relates to a polyoxymethylene molding composition comprising

Abstract: The present invention relates to a polyoxymethylene molding composition comprising:

Abstract: The present invention relates to single- or multilayer films and one or more layers comprising at least one polyolefin molding composition containing at least one polyolefin derived from at least one olefin having at least 2 carbon atoms, of the formula Ra—CH═CH—Rb, in which Ra and Rb are identical or different and are a hydrogen atom or a straight-chain or branched C1-C15-alkyl radical, or Ra and Rb, together with the atoms connecting them, form a ring or ring system, and the polyolefin has been prepared by means of metallocene catalysts. The present invention furthermore relates to a process for the production of films and layers in which a polyolefin molding composition having a particle size of from 20 &mgr;m to 5000 &mgr;m is used or prepared. The shaped polyolefin molding composition is melt-mixed with at least one additive and shaped. The melt-mixed and shaped material is melted at a temperature of from 150° C. to 300° C.

Abstract: The present invention relates to single- or multilayer films and one or more layers comprising at least one polyolefin molding composition containing at least one polyolefin derived from at least one olefin having at least 2 carbon atoms, of the formula Ra—CH═CH—Rb, in which Ra and Rb are identical or different and are a hydrogen atom or a straight-chain or branched C1-C15-alkyl radical, or Ra and Rb, together with the atoms connecting them, form a ring or ring system, and the polyolefin has been prepared by means of metallocene catalysts. The present invention furthermore relates to a process for the production of films and layers in which a polyolefin molding composition having a particle size of from 20 &mgr;m to 5000 &mgr;m is used or prepared. The shaped polyolefin molding composition is melt-mixed with at least one additive and shaped. The melt-mixed and shaped material is melted at a temperature of from 150° C. to 300° C.

Abstract: Pure N-vinyl-2-pyrrolidone is prepared by treating the crude N-vinyl-2-pyrrolidone with an acid ion exchanger.

Abstract: 3,4-dihydro-2H-pyrans of the formula I ##STR1## where R.sup.1 is C.sub.4 -C.sub.20 -alkyl, C.sub.4 -C.sub.20 -alkoxyalkyl, aryl or C.sub.7 -C.sub.20 -arylalkyl, or is aryl or C.sub.7 -C.sub.20 -arylalkyl which bears from one to three substituents selected from the group consisting of halogen, C.sub.1 -C.sub.8 -alkyl, C.sub.1 -C.sub.8 -haloalkyl, C.sub.1 -C.sub.8 -alkoxy or C.sub.1 -C.sub.8 -haloalkoxy, R.sup.2 is hydrogen or C.sub.1 -C.sub.4 -alkyl, R.sup.3 is aryl, or aryl bearing from one to three substituents selected from the group consisting of halogen, C.sub.1 -C.sub.8 -alkyl, C.sub.1 -C.sub.8 -haloalkyl, C.sub.1 -C.sub.8 -alkoxy or C.sub.1 -C.sub.8 -haloalkoxy, or the radical ##STR2## where R.sup.4, R.sup.5 and R.sup.6 are hydrogen or C.sub.1 -C.sub.4 -alkyl, R.sup.7 is phenyl or benzoyl, or phenyl or benzoyl bearing from one to three substituents selected from the group consisting of halogen, C.sub.1 -C.sub.8 -alkyl, C.sub.1 -C.sub.8 -haloalkyl, C.sub.1 -C.sub.8 -alkoxy and C.sub.1 -C.sub.

Abstract: Manufacture of insoluble polyvinyl lactams in the absence of oxygen and in the presence of .alpha.- or .beta.-ketocarboxylic acids or esters thereof.

Abstract: Manufacture of insoluble polyvinyl lactams by polymerization in the absence of oxygen and in the presence of sulfur compounds having a functionality of less than 6.

Abstract: Method of producing .gamma.-butyrolactams by reacting .gamma.-butyrolactones with ammonia in the presence or absence of water at elevated temperatures and pressures. The reaction is carried out continuously at temperatures ranging from 180.degree. to 340.degree.C whilst maintaining pressures which are at least 10 percent higher than the pressure equal to the sum of the partial pressures of the reactants at the temperature used. .gamma.-Butyrolactams are valuable intermediates, for example in the manufacture of polymers, pharmaceuticals and solvents.

Abstract: Manufacture of insoluble poly-N-vinyl-pyrrolidone-2 or copolymers of N-vinylpyrrolidone-2 in the presence of a difunctional crosslinker by heating the reaction solution at temperatures above 80.degree.C and completing the reaction at the boiling temperature of water.