Bayer Aktiengesellschaft

Hans E Kunzel

Francis Bentz

Gerhard D Wolf

Ralf Miessen

Klaus Elfert

Gunter Arend

Dieter Brokmeier

Claus-Rudiger Bernert

Peter Kleinschmidt

Helmut Sinner

Gunther Blankenstein

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 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 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 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.

High molecular weight aromatic copolyamides which contain a small proportion of structural units having 2,3-(1H,3H)-quinazoline dione rings are disclosed. The presence of quinazolinedione ring units in the copolyamide results in an increased moisture absorption capacity. By using small amounts of quinazoline dione units, the good physical properties of the corresponding quinazoline dione-free polyamide are substantially retained while the moisture absorption is significantly increased. Larger amounts of quinazoline dione units than contemplated (15 mol percent and more) do not improve the moisture absorption further and adversely affect the physical properties. The copolyamides are useful in textile applications in which the improved moisture absorption serves to make clothing prepared from such textiles more comfortable.

Growing community of inventors

Dormagen, Germany

Hans E Kunzel