Bayer Aktiengesellschaft

Francis Bentz

Gerhard D Wolf

Gunther Nischk

Hans E Kunzel

Ralf Miessen

Theo Neukam

Klaus Elfert

Ulrich Reinehr

Helmut Engelhard

Hans J Rosenkranz

Gunter Arend

Frank Druschke

Claus-Rudiger Bernert

Dieter Brokmeier

Peter Kleinschmidt

Eugen Velker

Gunther Blankenstein

Helmut Sinner

A disulphimide group-containing acrylonitrile copolymer semi-permeable membrane which comprises:

Process of using a semi-permeable membrane of acrylonitrile copolymers

This invention relates to urethanes which contain at least one sulphonic acid group and at least two free OH-groups and to a process for the preparation thereof.

Polyalkylene oxide-containing urethane polyols with sulphonic acid groups

The invention relates to semipermeable membranes with a water absorption capacity of from 4.5 to 11% by weight, preferably from 4.5 to 8% by weight, as measured on approximately 40.mu. thick symmetrical films at room temperature and at 65% relative air humidity, a throughflow of 130 to 200 l/m.sup.2 d for a desalination level of 94.6 to 99.5% and consisting of an aromatic heterocycle-containing copolyamide with a relative viscosity of .gtoreq.1.4, as measured on a 0.5% N-methyl pyrrolidone solution at a temperature of 20.degree. C.

Semipermeable membranes of heterocyclic copolyamides

The invention relates to semipermeable membranes with a water absorption capacity of from 4.5 to 10% by weight preferably from 4.5 to 8% by weight as measured on approximately 40.mu. thick symmetrical films at room temperature and 65% relative air humidity, with a throughflow of at least 80 1/m.sup.2 d for a desalination level of at least 85% and consisting of a fully aromatic copolyamide with a relative viscosity of .gtoreq.1,4, as measured on a 0.5% N-methyl pyrrolidone solution at a temperature of 20.degree. C.

Semipermeable membranes of copolyamides

The instant invention relates to dihydroxy carbamates containing sulphonic acid groups, and to a process for their production. They are obtained by the addition of bisulphites to unsaturated carbamates.

Dihydroxy carbamates containing sulphonic acid groups

The invention relates to antistatic polyamide compositions comprising a polyamide and as an antistatic agent from 0.1 to 20%, preferably from 1.5 to 15%, by weight based on the total weight of the composition of urethanes with ether groups. The urethanes with ether groups are stable in melts of aliphatic polyamides for prolonged periods at temperatures of up to about 300.degree. C. and filaments and fibers of such polyamides or woven fabrics, knitted fabrics, non-woven or pile fabrics produced from these filaments or fibers show outstanding antistatic properties.

Antistatic polyamide compositions with polyalkyleneglycol ether having

The invention relates to a process for the production of a stabilized crosslinkable copolymer of acrylonitrile which comprises copolymerizing at least 65% by weight of acrylonitrile with from 0.1 to 3% by weight of an N-methylol acyl ester of an ethylenically unsaturated carboxylic acid amide, optionally from 0.5 to 5% by weight of an N-methylol alkyl ether of an ethylenically unsaturated carboxylic acid amide and, optionally, at least one other copolymerizable comonomer in an aqueous medium in the presence of a redox catalyst and in the presence of at least one water-soluble compound containing a carboxylic acid amide group.

Stabilization of crosslinkable polymers

The present invention relates to new polyether urethanes corresponding to the general formula ##STR1## and to a process for their production. The polyether urethanes are stable for prolonged periods at temperatures of up to approximately 300.degree. C in aliphatic polyamide melts, and polyamides containing urethanes of this kind, more especially filaments and fibers of such polyamides or woven fabrics, knitted fabrics, nonwovens or pile fabrics produced from these filaments or fibers, show excellent antistatic properties.

Polyether urethanes as antistatic additives in polyamide compositions

The invention relates to a process for the production of dyed filaments from aromatic polyamides which are not modified with acid or basic groups.

Process for dyeing wet-spun aromatic polyamides in gel form

The invention relates to a process for the production of dyed filaments from aromatic polyamides which are modified with acid groups.

Process for dyeing dry-spun aromatic polyamides

The invention relates to a process for the production of stabilized, crosslinkable copolymers of acrylonitrile with N-methylol alkyl ethers of unsaturated carboxylic acid amides and optionally other comonomers by polymerizing in the presence of a stabilizer compound containing a carboxylic acid amide group such as amide, urea or lactam.

Stabilizing crosslinkable copolymers comprising acrylonitrile,

The invention relates to a process for the production of dyed filaments of aromatic polyamides which have not been modified with acid or basic group.

Dyeing dry-spun aromatic polyamides

The invention relates to a process for the production of dyed filaments from aromatic polyamides which contain acid groups.

The invention relates to a process for the production of crosslinkable polymers of acrylonitrile by polymerising acrylonitrile with a crosslinking component and optionally other comonomers in strongly polar organic solvents and in the presence of a peroxodisulphate and a 1,3-diketone as initiator system.

Spinnable solutions containing crosslinkable copolymers of acrylonitrile

The instant invention relates to dihydroxy sulphonates containing ether groups, and to a process for their production. They are obtained by the addition of bisulphites to (poly)alkoxylated dihydroxy alkenes.

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Cologne, Germany

Francis Bentz