Abstract: Sizing agent-free tangled multifilament yarn with an opening length of 1 to 6 cm and a knot strength of no more than 2, at least the majority of whose filaments have a thin film consisting mainly of hard wax constituting about 0.3 to 2% of the total weight of the filaments together with this film, and are glued, at least in places, via this film to adjacent filaments.

Abstract: Thermotropic, fully aromatic polyesters, which consist essentially of(a) repeating units of the formula ##STR1## in proportions of 20 to 70 mole percent, (b) units of the formula ##STR2## in proportions of 10 to 40 mole percent, (c) one or both units of the formula ##STR3## wherein X=C.dbd.O or --O--, in proportions of 0 to 15 mole percent, (d) units of the formula(s) ##STR4## in proportions of 0 to 33 mole percent, and (e) units of the formula ##STR5## in proportions of 2 to 40 mole percent, have high Vicat B temperatures and can be thermoplastically processed at temperatures below 400.degree. C.

Abstract: The invention relates to a hydrophilic moulding compound of homopolyester and/or copolyester which contains 1 to 20 percent by weight of an alkaline and/or alkaline-earth salt of salt-forming polymer and/or copolymers from ethylenic unsaturated monomers as finely dispersed filling material, having in particualr a maximum particle size of 1 um, the salt-forming polymers being composed in particular of the following single monomers or mixtures thereof: vinyl-sulfonic acid, acrylamidoalkylene-sulfonic acid, sulfonated styrene, acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, crotonic acid, vinyl-phosphonic acid, monoalkyl ester of maleic acid, monoalkyl ester of fumaric acid.The invention also relates to a process according to which the salts are preferably added to the polycondensation mixture of the polyester starting materials before and/or during poly-condensation as a suspension in polyhydric alcohol.

Abstract: A dialysis membrane used for hemodialysis having a structure comprised of flat films, blown films or tubular threads of substitution-modified cellulose, in which the effects of complement activation and leukopenia are clearly reduced. The average degree of substitution of the modified cellulose is 0.02 to 0.07. Dialysis membranes, which have proven successful within the scope of the invention, contain modified cellulose, having a structure represented by the formula cellulose-Z, wherein Z represents the group --R'--X--Y.X is at least one member selected from the group consisting of ##STR1## Y is at least one member selected from the group consisting of --R, --NR.sub.2, --Si(OR").sub.3, --SO.sub.3 H, --COOH, --PO.sub.3 H.sub.2, --N.sup.+ HR.sub.2, --OR" and the salts thereof.R' is at least one member selected from the group consisting of an alkylenes cycloalkylenes and arylenes having a total of 1 to 25 carbon atoms.R" is a hydrogen atom or R.

Abstract: Water-containing water glass fibers are disclosed, substantially free from non-alkaline compounds and having a water content of from about 15 to 30% by weight, a tear strength of from about 5 to 30 cN/tex, a ratio of alkaline oxide to silicon dioxide of from about 1:3 to 1:1.9, an amorphous structure and a density of from about 2 g/cm.sub.3 to 2.5 g/cm.sup.3. The fibers are preferably cut into lengths of from 1 to 40 mm. They may be used for subsequent production of silica fibers, a technique more advantageous than producing the latter from a melt containing SiO.sub.2 or by acid-leaching of glass fibers. The silica fibers are useful for producing wet webs, filter linings and reinforcing material.

Abstract: Thermoplastically workable polyurethane-elastomers are disclosed which are obtained through polyaddition of substantially pure trans-cyclohexane-1,4-diisocyanate, macrodiols of average molecular weight from 800 to 4000 and bisethoxylated Bisphenol A or mixtures thereof with short-chain diols customarily employed as chain lengtheners. The polyurethanes possess the advantage that their softening points lie in a very favorable temperature range which makes possible their thermoplastic workability at below the decomposition temperature, and also guarantees outstanding mechanical-elastic characteristics as well as excellent long-term light stability. As a result the polyurethanes according to the present invention are outstandingly suitable as material for shaped bodies to be employed in areas of use placing high requirements on the employed materials. For example, highly valuable elastomer fibers can be manufactured from these polyurethanes by means of melt spinning.

Abstract: Process for the production of silica fibers of the type in which alkali water glass is dry spun into water-containing alkali silicate fibers which are then contacted with solutions containing hydrogen ions for transforming into silica fibers, the improvement being dry-spinning glass free from non-alkaline compounds having a molar ratio of alkaline oxide to silic dry dioxide of from about 1:3 to 1:1.9 and a viscosity of about 10-700 Pa measured at 30.degree. C., at 10.degree.-50.degree. C. in a drying funnel of a temperature of more than 100.degree. C., at a discharge velocity of minimum 5 m/min.

Abstract: Process for the production of water containing water glass fibers of the type in which alkali water glass is dry spun into water containing fibers, the improvement being dry-spinning water glass free from non-alkaline compounds having a molar ratio of alkaline oxide to silicon dioxide of from about 1:3 to 1:1.9 and a viscosity of about 10-700 Pa measured at 30.degree. C., at 10.degree.-50.degree. C. in a drying funnel of a temperature of more than 100.degree. C., at a discharge velocity of minimum 5m/min.

Abstract: Zinc chelates of terephthaloyl-terephthalic/oxalic copolyhydrazides, the oxalic dihydrazide and terephthalic dihydrazide units having a molar ratio in the range of 19:6 to 6:19, as well as the products aftertreated with an oxalic acid solution.

Abstract: Mixtures hardenable under the influence of air moisture are provided. They comprise at least one organic polyisocyanate or an polyepoxide and as a moisture activated hardener an N,N'-substituted imidazolidine derivative or an N,N'-substituted hexahydropyrimidine derivative, which show at no nitrogen atom a --CO--NH-- grouping and which are present in sufficient amount to provide for cross-linking. The mixtures for example provide lacquers and adhesives having various touch dry times.

Abstract: Polyurethanes prepared from macrodiols with an average molecular weight between about 800 and 4000, lower molecular weight chain extenders with at least two labile hydrogens, and cyclohexane-1,4-diisocyanate with a trans-isomer content of at least 90%, are described. These polyurethanes exhibit exceptional mechanical properties, high softening temperatures, and remarkable stability to light and to many common solvents.Methods for preparation of the novel polyurethanes, as well as for their use, are also disclosed.

Abstract: Flame retardant films and fibers of zinc chelates of terephthaloyl-terephthalic/oxalic copolyhydrazides, the oxalic dihydrazide and terephthalic dihydrazide units having a molar ratio in the range of 19:6 to 6:19. The products aftertreated with an oxalic acid solution are colorless.

Abstract: A process for the production of high molecular weight, fiber- and film-trimming polyterephthaloyl oxalamidrazone and polydiphenylether-4,4'-dicarboxylic acid oxalamidrazone where a solution of pure terephtaloyl chloride or diphenyl-ether-4,4'-dicarboxylic acid dichloride in an inert solvent free from amines and water is slowly added, at a temperature between 10.degree. C. and 35.degree. C., to a solution of pure oxalic acid bisamidrazone in dimethyl acetamide and/or N-methyl pyrrolidone, free from amines and water, containing 4 to 6 percent by weight of anhydrous lithium chloride, the total quantity of the solvents used amounting to 1.25 to 3.30 liters per mole of oxalic acid bisamidrazone.