Bayer Aktiengesellschaft

Hermann Lohwasser

Ulrich Reinehr

Alfred Nogaj

Alfred Nagaj

Horst Wieden

Salts of formula (III) ##STR1## wherein R.sup.1 represents CN or a C.sub.1 -C.sub.8 alkyl group, R.sub.2 a mononuclear C.sub.6 -C.sub.10 aryl group and R.sub.3 a C.sub.1 -C.sub.3 alkyl group or hydrogen; and of formula (IV) ##STR2## wherein R represents hydrogen or C.sub.1 -C.sub.3 alkyl, Aryl a C.sub.6 -C.sub.10 (substituted) phenyl group, and R', R' represent hydrogen and C.sub.1 -C.sub.4 alkyl or R'+R' together represent C.sub.4 alkylene and a process for their preparation by reaction of the thiocarbamate of a primary aliphatic amine, of a bis-amine or of cyanamide with a guanidine hydrohalide.

Dithiocarbamate salts and their use as vulcanization accelerators

The invention relates to dry-spun polyacrylonitrile filament yarns having a tensile strength of at least 47 cN/tex and an individual filament denier of at most 1.5 dtex and preferably an overall denier of 20 to 145 tex as well as to a process for the production thereof by spinning, hot drawing and relaxing, wherein the spun filaments are drawn during spinning to such an extent that, after subsequent hot drawing in a ratio of from 1:6 to 1:10 and relaxation, the individual filaments have a denier of at most 1.6 dtex.

Polyacrylonitrile filament yarns

The invention relates to a process for the production of bulk yarns from chemically different acrylonitrile polymers.

Process for the production of bulk yarns

The invention relates to a process for the production of spontaneously crimping composite fibres of acrylonitrile polymers wherein the dry-spun-filaments which still contain solvent are stretched to at least three times their original length in a bath of hot water which contains from 12 to 30 % by weight of dimethyl formamide. The stretching operation may be carried out in one or two stages.

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Dormagen, Germany

Hermann Lohwasser