Abstract: Fibers, preferably electret fibers, made of materials which contain predominantly fiber-forming polymer or polycondensate, with a preparation applied onto the fibers, where the applied preparation contains at least one active substance which has volatilized after a time period of 20 minutes at a temperature of at most 250° C., preferably at most 230° C., to at least 80 weight % are disclosed. The active substance is preferably a compound having the general formula (I) R1R2R3NO  (I) where R1 is hydrogen or an unsubstituted or substituted C1-C30 alkyl, alkenyl, or aryl group, and R2 and R3, independently of one another, are hydrogen or unsubstituted or substituted C1-C10 alkyl, alkenyl, or aryl groups.

Abstract: The low-shrinkage hybrid yarns comprise reinforcing filaments and matrix filaments composed of thermoplastic polymers having a lower melting point than the melting or decomposition point of the reinforcing filaments. The yarns are characterized by a 160.degree. C. hot air shrinkage of not more than 2% and a 200.degree. C. hot air shrinkage of not more than 5%. A process for producing these hybrid yarns includes the steps of feeding yarn strands moving at different speeds into an entangling jet, heating a matrix feed yarn during the feeding thereof into the entangling jet, entangling the feed yarn strands, and taking off the strands with or without shrinkage and additional heating.

Abstract: There is described a synthetic yarn fabric for the gas-releasing part of an airbag. The synthetic yarn is a synthetic high-tenacity multifilament yarn having a filament linear density of less than 4 dtex and a yarn count within the range from 250 to 550 dtex. The fabric itself is in a crepe or modified huckaback weave. In contradistinction to the conventional polyamide fabrics, it is uncoated and is preferably woven from unsized yarns. The fabric need not be calendered. It has been found that this fabric of fine-filament, high-tenacity polyester yarn, although uncoated, does meet the airbag fabric requirements such as readily preselectable air permeability, low fabric weight and low fabric thickness and also high fabric strength.

Abstract: The low-shrinkage hybrid yarns comprise reinforcing filaments and matrix filaments composed of thermoplastic polymers having a lower melting point than the melting or decomposition point of the reinforcing filaments. The yarns are characterized by a 160.degree. C. hot air shrinkage of not more than 2% and a 200.degree. C. hot air shrinkage of not more than 5%.These yarns are useful for producing composites.

Abstract: Woven or laid structures comprising at least two systems of parallel threads, at least one of these thread systems having more than 10 threads per centimeter and comprising at least 10%, based on the thread system, of hybrid yarns comprising reinforcing filaments and lower melting matrix filaments composed of thermoplastic polymers. In such woven or laid structures, the matrix component can be melted to form textile sheet materials of adjustable gas and/or liquid permeability, which are especially useful for manufacturing airbags.

Abstract: Described is a composite comprising at least one textile sheet construction composed of synthetic polymer and hybrid yarn comprising reinforcing fiber and lower melting bonding fiber. Also described is a net comprising in at least one direction hybrid yarns composed of reinforcing fiber and of lower melting bonding fiber. The composites can be used for producing bituminized roofing and sealing membranes.

Abstract: The present invention relates to a concrete mold liner and to molds for concrete production which produce patterned or very smooth concrete surfaces.

Abstract: A process for the production of hydrolysis resistant polyester fibers and filaments (preferably monofilaments for use in paper making machine sieves) comprises feeding a masterbatch of a polymeric carrier and an end group blocking agent to a spinneret together with a thread-forming polyester material, wherein the polymeric carrier has practically no end groups which react with the end group blocking agents. In addition to the process and the masterbatch, the polyester fibers or filaments of increased resistance to hydrolysis, in which the agents for blocking the end groups are distributed inhomogeneously over the cross-section of the monofilament, comprise a content of end group blocking agent that increases continuously from the core to the jacket of the fiber.

Abstract: The use is disclosed of modified polyesters, for example isophthalic acid modified polyethylene terephthalate in high frequency welding. The process is useful for incipient or complete melting of shaped structures, especially sheets, films, coats, hollow articles, injection-molded articles, yarns and textile sheet materials comprising such yarns , composed of such polyesters. The process can be carried out with customary high frequency welding equipment.

Abstract: A tow of melt spun filaments and a method for treating such filaments to produce a tow of uniformly crimped filaments having a high initial modulus by heat setting and stuffer box crimping includes the steps of heat-setting the tow, spraying the hot-heat-set tow with an aqueous fiber finish to effect shocklike cooling of the tow, passing the sprayed tow to a pair of squeeze rolls in whose nip it is kneaded through using a defined nip pressure and squeezed off to a fiber finish pickup of 0.7 to 7% by weight of the tow weight, heating the squeezed-off moist tow on a heated multiroll arrangement in such a way that it leaves the multiroll arrangement with a moisture content of 0.5 to 5% by weight of the tow weight and a temperature of 40.degree. to 1000.degree. C., feeding the tow with this moisture content and this temperature to a crimping machine and crimping it.

Abstract: Polyesters are disclosed containing at least 0.1 mol % of the structural repeat units of the formula I and optionally up to 99.9 mol % of the structural repeat units of the formula II--O--OC--Ar.sup.1 --CO--O--R.sup.1 -- (I)--O--OC--Ar.sup.2 --CO--O--R.sup.2 -- (II)whereAr.sup.1 is a radical of the formula III and/or of the formula IV and/or of the formula V ##STR1## Ar.sup.2 is a bivalent mono- or polycyclic aromatic radical which differs from the radicals of the formulae III, IV and V,R.sup.1 and R.sup.2 are independently of each other a bivalent cycloaliphatic radical derived from cyclohexanedimethanol, a radical of the formula --.sub.n H.sub.2n -- and/or a radical of the formula --?C.sub.m H.sub.2m --O--!.sub.x --C.sub.m H.sub.2m --,wheren is an integer between 2 and 10,m is an integer between 2 and 10, andx is an integer from 1 to 20,Y is a direct C--C bond, --NR.sup.3 --, --S-- or --O--,Z is a direct C--C bond or a bridging group --O--, --C.sub.q H.sub.2q --, --S--, --CO-- or --SO.sub.

Abstract: Cut-resistant fibers comprise a filler having a Mohs hardness of at least 3 and a fiber-forming material comprising selected aromatic polyamides soluble in polar aprotic organic solvents. The fibers are useful for manufacturing protective clothing.

Abstract: Papermaking machine fabrics, filters and reinforcing layers for elastomers, comprise monofilaments of copolymers containing 85 to 99 mol % of the structural repeat unit of the formula I ##STR1## 1 to 15 mol % of the structural repeat unit of the formula II--OC--R.sup.2 --CO--O--R.sup.3 --O-- (II),whereR.sup.1 is a radical of a dihydric aliphatic or cycloaliphatic alcohol or is derived from mixtures of such alcohols,R.sup.2 is a radical of an aliphatic, cycloaliphatic or monocyclic aromatic dicarboxylic acid or is derived from mixtures of such dicarboxylic acids,R.sup.3 assumes one of the definitions for R.sup.1, and the quantitative data are based on the total amount of the polymer.

Abstract: Described is a rollable thermal insulation comprising synthetic fiber material and having a thermal conductivity of not more than 0.04 W/m*K (determined in accordance with DIN 4108 Part 1) and a DIN 4102 Part 1 fire behavior corresponding to building material class B1, wherein the synthetic fiber material is composed of carrier and bonding fibers made of polyester, preferably polyethylene terephthalate, the bonding fibers consisting in at least parts of the surface of a polyester having a melting point which is below the melting point of the carrier fibers.

Abstract: A safety belt is made of a fabric of high-tenacity filament yarns made of phosphorus-modified copolyester having a yarn linear density of less than 2000 dtex, having a single-fiber linear density of less than or equal to 25 dtex and having a breaking elongation of less than 30%. The phosphorus-modified copolyester contains a bifunctional phosphorus compound in an amount of 0.1% to 5% by weight, based on the amount of phosphorus, in the polymer chain.

Abstract: A method for treating a tow of melt-spun filaments to produce a tow of uniformly crimped filaments having a high initial modulus by heat-setting and stuffer box crimping includes the steps of heat-setting the tow, spraying the hot-heat-set tow with an aqueous fiber finish to effect shocklike cooling of the tow, passing the sprayed tow to a pair of squeeze rolls in whose nip it is kneaded through using a defined nip pressure and squeezed off to a fiber finish pickup of 0.7 to 7% by weight of the tow weight, heating the squeezed-off moist tow on a heated multiroll arrangement in such a way that it leaves the multiroll arrangement with a moisture content of 0.5 to 5% by weight of the tow weight and a temperature of 40.degree. to 100.degree. C., feeding the tow with this moisture content and this temperature to a crimping machine and crimping it.

Abstract: Described is a support for electrodes of primary or secondary electric cells, said support comprising an open-mesh, three-dimensional network structure composed of plastics threads coated unbrokenly with one or more efficiently conducting, thin metal coats and, to form the three-dimensional structure, being provided with humplike depressions and/or elevations which are distributed over its surface and in whose region the distance between the plastics threads is increased, wherein at least the outer metal coat of the plastics threads consists of a valve metal. Also described are electrodes comprising such a support and a process for producing the articles mentioned.

Abstract: Described are monofilaments with a core-sheath structure comprising a core of a thermoplastic polyester or copolyester and a sheath comprising a thermoplastic polyester, wherein the polyester or copolyester of the core has a melting point of 165.degree. to 290.degree. C., preferably of 220.degree. to 240.degree. C., and includes at least 70 mol %, based on the totality of all polyester structural units, of structural units derived from aromatic dicarboxylic acids and from aliphatic diols, and not more than 30 mol %, based on the totality of all polyester structural units, of dicarboxylic acid units which differ from the aromatic dicarboxylic acid units which form the predominant portion of the dicarboxylic acid units, and diol units derived from aliphatic diols and which differ from the diol units which form the predominant portion of the diol units, and the sheath comprises a polyester mixture comprising a thermoplastic polyester whose melting point is between 165.degree. and 240.degree. C., preferably 220.

Abstract: Two-component loop yarns are composed of core and effect filaments, at least part of the core component consisting of aromatic polyamides, wherein the aromatic polyamides contain the structural repeat units of the formulae I and II--OC--Ar.sup.1 --CO--NH--Ar.sup.2 --NH-- (I)--OC--Ar.sup.1 --CO--NH--Ar.sup.3 --NH-- (II),where Ar.sup.1, Ar.sup.2 and Ar.sup.3 are each independently of the others a bivalent mono- or polycyclic aromatic radical whose free valences are disposed para or meta or comparably parallel, coaxial or angled to each other, and Ar.sup.2 and Ar.sup.3 each have different individual meanings within the scope of the given definitions, and the respective monomer components underlying the polymer are selected so as to produce an aromatic polyamide which forms preferably isotropic solutions in organic solvents.

Abstract: Described are monofilaments with a core-sheath structure comprising a core of a thermoplastic polyester or copolyester and a sheath comprising a thermoplastic polyester, wherein the polyester or copolyester of the core has a melting point of 200.degree. to 300.degree. C., preferably of 220.degree. to 285.degree. C., and includes at least 70 mol %, based on the totality of all polyester structural units, of structural units derived from aromatic dicarboxylic acids and from aliphatic diols, and not more than 30 mol %, based on the totality of all polyester structural units, of dicarboxylic acid units which differ from the aromatic dicarboxylic acid units which form the predominant portion of the dicarboxylic acid units, and diol units derived from aliphatic diols and which differ from the diol units which form the predominant portion of the diol units, and the sheath comprises a polyester mixture comprising a thermoplastic polyester whose melting point is between 200.degree. and 300.degree. C., preferably 220.