Bayer Aktiengesellschaft

Bayer Akteingesellschaft

Bayer Faser Gmbh

Michael Kausch

Carlhans Suling

Karl-Heinz Wolf

Rudi Dauscher

Hans Schroer

Wolfgang Klein

Konrad Schmitz

Hans-Josef Buysch

Rolf-Volker Meyer

Karlheinz Wolf

Beatrix Frauendorf

Heinz Gall

Christine Soenksen

The invention describes elastane packages on cylindrical tubes which are provided with a finishing oil content varying over the filament length, and a method for the production thereof. Instead of being applied uniformly along the filament, the finishing oil is distinctly increased on the outermost part, constituting in particular at least 3%, of the filament wound onto the tubes such that the oil coat in this region is at least 1.2 times higher than in the remaining region of the package. This gives rise to a finishing coat gradient of the package from the outside (high) inwards (low).

Elastane fiber spools provided with a variable application of a preparation

The invention relates to a spinning process, more particularly a dry spinning process, for the production of elastane fibers in which 0.8 to 2% by weight of polydimethylsiloxane with a viscosity of 50 to 300 cSt and 0.2 to 0.6% by weight of ethoxylated polydimethylsiloxane with a viscosity of 20 to 150 cSt are added to the elastane spinning solution before it is spun.

Yarn formed of eastane fibers produced by the dry spinning or wet spinning of spinning solutions which include polydimethylsiloxane and ethoxylated polydimethylsiloxane

Process for the production of elastane fibers by inclusion of a

The invention relates to a process for the production of highly concentrated and, surprisingly, viscosity-stable solutions of segmented polyurethane urea elastomers in highly polar solvents, such as dimethyl formamide and dimethyl acetamide, having little or no tendency to turn to paste, characterized by the use of certain primary and secondary cycloaliphatic monoamines or cycloaliphatic monisocyanates as chain-extending agents/blocking agents in the reaction of NCO prepolymers based on relatively high molecular weight dihydroxy compounds and (preferably aromatic) diisocyanates with aliphatic and and/or cycloaliphatic diamine chain-extending agents. The chain terminators according to the invention also show unexpected iprovements in the color of the elastomer solution and also in the stability of the end products, preferably filaments, to light and noxious gases. The invention also relates to elastomers of corresponding composition containing special terminators, preferably in the form of filaments, films or coatings showing improved stability to light and waste gases.

Process for the production of segmented polyurethane urea elastomer

The invention relates to elasthane fibers which are protected against harmful environmental influences, particularly sunlight and combustion gases, by a synergistic stabilizer combination of

Elasthane fibers stabilized against environmental influences

The invention relates to essentially linear polyurethane elastomers, having improved properties, made from polyester or polyether diols, diisocyanates and chain extenders, the latter having liquid-crystalline properties; and also films and, in particular, fibres which are prepared on the basis of such liquid-crystalline polyurethane components and are shaped thermoplastically (via melting) or from solutions (by solution spinning processes). The invention furthermore relates to an appropriate process for the preparation of the polyurethane elastomers, particularly of PU elastomer fibres (Elasthan and Spandex fibres).

Linear polyurethane elastomers, and a process for the preparation thereof

This invention relates to highly stretchable elasthane fibres (Spandex fibres) based on segmented polyurethane(urea)s with improved elastic properties and high resistance to microbial degradation, characterized in that the polyurethane(urea)s used for the synthesis of the elasthanes are prepared from mixtures of relatively high molecular weight copolyester diols in the molecular weight range of from 2,500 to 4,000 and relatively high molecular polytetrahydrofurandiols in the molecular weight range of from 1,500 to 3,000.

Highly stretchable elasthane fibres with improved properties

In the production of elasthane threads by solution spinning of polyurea polyurethanes by conventional spinning processes, excellent stabilization against light and noxious gases are obtained if at least one component of the system to be spun contains tertiary amino groups and the substances used as antioxidizing agents are phenols of the kind which do not form colored nitro compounds.

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Kö'ln, Germany

Michael Kausch