Hoechst Aktiengesellschaft

Hoechst Trevira Gmbh & Co Kg

Cassella Aktiengesellschaft

Arteva North America S.a.r.l.

Peter Klein

Karl Heinrich

Georg-Emerich Miess

Gunter Keil

Holger Jung

Richard Neuert

Hans-Jerg Kleiner

Uwe Kampschulte

Volker Freudenberger

Friedrich Engelhardt

Rolf Kleber

Karl Hintermeier

Dirk Zierer

Wolfgang Teige

Hans Wagner

Wilfried Pressler

Rex Delker

Werner Bruckner

Bernd Dewald

Bernd Espenschied

Ligia Dominguez De Walter

Ralph Thielemann

Banks Bryan Moore

Georg-Emrich Miess

Process for the preparation of heat-stable, antimony-free polyesters of neutral color and the products which can be prepared by this process

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

Modified polyesters, preparation thereof and use thereof

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

Papermaking machine fabrics

The invention relates to a process for preparing phosphorus-containing compounds of the formula I ##STR1## in which R.sup.1 and R.sup.2 are an alkyl radical having 1 to 8 carbon atoms, a cyclohexyl radical, a cyclopentyl radical, an aryl radical or a halogen-, alkyl- or alkoxy-substituted aryl radical, where R.sup.1 and R.sup.2 together with the phosphorus atom can also form a ring, n and m=0 or 1 and R.sup.3 and R.sup.4 are alkyl radicals having 1 to 4 carbon atoms or n=0, m=0 or 1 and R.sup.3 and R.sup.4 are H, by adding compounds of the formula II ##STR2## into dialkyl esters of fumaric acid or of maleic acid of the formula (III) or dialkyl esters of itaconic acid of the formula (IV) ##STR3## in which R.sup.3 and R.sup.4 have the meaning given above, and, optionally reacting an alkyl ester of a phosphorus-containing dicarboxylic acid of the formula (I), where n=0, with water in the presence of catalytic amounts of an acid to give the phosphorus-containing dicarboxylic acid.

Process for preparing phosphorus-containing dicarboxylic acids alkyl

A process for producing mass-colored fiber or film, comprises the steps of:

Mass-colored formed structures based on aromatic polyamides,

A process for producing fibers or films by the steps of: a) preparing an aromatic polyamide by polycondensation of dicarbonyl dihalides or mixtures thereof with at least two diamines in N-alkyllactams as a solvent, the polycondensation being of at least 90 mol %, based on the total amount of dicarbonyl dihalides in the reaction mixture, of compounds of the formula I or mixtures of such compounds Hal--OC--Ar.sup.1 --CO--Hal (I) with at least 90 mol%, based on the total amount of diamines in the reaction mixture, of compounds of the formula II and optionally III or mixtures of such compounds H.sub.2 N--Ar.sup.2 --NH.sub.2 (II), H.sub.2 N--Ar.sup.3 --NH.sub.2 (III) where Ar.sup.1, Ar.sup.2 and Ar.sup.3 are independently of each other a bivalent aromatic radical, the proportion of structural repeat units in the aromatic polyamide derived from the compounds of the formula II, based on the proportion of the structural repeat units derived from the compounds of the formulae II and III, being at least 50 mol %, and said aromatic polyamide is soluble in organic solvents, b) forcing the solution of the aromatic polyamide obtained in step a) through dies of the desired cross-sectional shape at temperatures from 40.degree. to 120.degree. C. to form fibers or films, c) removing the organic solvent in a conventional manner to produce solvent-leaner or -free fibers or films sufficiently mechanically stable and nontacky for further processing. The process of the invention omits the customary neutralization after the aromatic polyamide has been prepared.

Production of fibers or films using specific forming solutions and the

Aromatic copolyamides, production thereof, formed structures and production thereof Described are aromatic copolyamides comprising the structural repeat units of the formulae I, II and III ##STR1## where Ar.sup.1, Ar.sup.2, Ar.sup.3 and Ar.sup.4 are independently of one another bivalent aromatic radicals whose valence bonds are disposed para or comparably coaxial or parallel to each other,

Aromatic copolyamides, production thereof, formed structures and

Described are low-pill, low-flammability linear fiber-forming polyesters formed from dicarboxylic acid and diol components, which polyesters contain in their polymer chain modifying units formed by esterification or transesterification from compounds of the formulae I and/or II and/or III ##STR1## where R.sup.1 and R.sup.2 are identical or different and each is a univalent aliphatic, araliphatic or aromatic hydrocarbon radical having 1 to 12 carbon atoms, or

Low-pill, low-flammability polyesters, production thereof and structures

A process is described for preparing directly spinnable polymer solutions containing as fiber-forming substance polymers containing at least 95 mol %, based on the polymer, of the recurring structural unit of the formula I

Preparation of fiber-forming meta-aramids

Fiber materials from synthetic polymers, wherein the synthetic polymer is a homogeneous alloy consisting essentially of

Fiber materials from homogeneous blends of aromatic polyamides and

An aromatic copolyamide which is soluble in organic copolyamide solvents and contains recurring structural units of formulae I, II and III ##STR1## in which at least some of the radicals R.sup.1 are a group of formula --OC--R.sup.2 --CO--, in which R.sup.2 is a divalent aromatic radical having valence bonds in the para-position or in a comparable coaxial of parallel position to one another, and in which the remaining radicals are as defined.

Aromatic copolyamides, process for their preparation and shaped articles

Aromatic copolyamides are described which are soluble in organic polyamide solvents and which comprise the recurring structural units of the formulae Ia, Ib, Ic and Id

Aromatic copolyamides, processes for their preparation and structures

There are described aromatic copolyamides which are soluble in organic polyamide solvents and which consist essentially of recurring structural units of the formulae Ia, Ib and Ic on the one hand and Ia, Ib and Ie on the other

Automatic copolyamide

Aromatic copolyamides are described which are soluble in organic polyamide solvents and which essentially consist of the recurring structural units of the formulae Ia, Ib and Ic ##STR1## wherein R.sup.1 and R.sup.4 are divalent aromatic radicals, the valency bonds of which are in the para position or in a comparable coaxial or parallel position relative to one another, R.sup.2 is a radical of the formula III ##STR2## and R.sup.3 is a radical of the formula IV ##STR3## The mole fractions of the individual structural features in the copolyamides are fixed within selected limits. Fibers composed of the copolyamides claimed are distinguished by a high stretchability.

Aromatic copolyaide from diamino benzanilide

There is described a process for preparing aromatic polyamides of high hydrolysis resistance by reacting aromatic diamines in a conventional organic solvent and in the presence or absence of inorganic salts wherein the diamine, which has a water content of up to 25% by weight, is dissolved in the organic solvent, which may likewise contain water, and the solution is subjected to a vacuum distillation until the water content of the bottom product is &lt;100 ppm and subsequently the inorganic salts if necessary and then the dicarbonyl dichloride are added in a conventional manner and the condensation reaction is performed and concluded in a conventional manner.

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Wiesbaden, Germany

Peter Klein