Basf Aktiengesellschaft

Franz Schmidt

Erhard Seiler

Gunter Pipper

Rolf Wurmb

Hans-Josef Sterzel

Claus Cordes

Gerhard Fahrbach

Martin Laun

Richard Bung

Wolfgang Schenk

Gerd Blinne

Harro Petersen

Horst Reimann

Eckhard M Koch

Rainer Theysohn

Georg N Simon

Hermann Fischer

Franz Zahradnik

Paul Matthies

Gerhard Welzel

Eduard Heil

Richard Pflueger

Richard Thoma

Hans Pirzer

Wolfgang Groh

Josef G Floss

Siegfried Riegger

Gunter Eckert

Gerd Louis

Klaus Haas

Jurgen Schmidt-Thummes

Hans Lutje

Copolyamides are prepared by a continuous process in which

Continuous preparation of copolyamides from caprolactam and salt of

A highly dilatant copolymer dispersion containing, as essential components, an emulsion copolymer prepared from 1 to 10% by weight, based on the sum of the monomers employed, of .alpha.,.beta.-monoolefinically unsaturated carboxylic acids and other olefinically unsaturated monomers, in which the emulsion copolymer is prepared in the presence of from 5 to 30% by weight, based on the sum of the monomers employed, of allyl carboxylate or alkylallyl carboxylate containing 2 or more copolymerizable olefinic double bonds, or a mixture thereof, the alkyl radical containing 1 to 4 C atoms, and the preparation thereof.

Highly dilatant copolymer dispersion having high continuous-load

A dispersion, having highly dilatant flow, of a carboxyl-containing copolymer of monoolefinically unsaturated monomers, wherein the temperature dependence of the critical shearing rate is greatly reduced by incorporation of from 0.1 to 30% by weight of oxides, hydroxides, carbonates and/or water soluble salts of monovalent or divalent metals.

Highly dilatant polymer dispersions with reduced temperature dependence

Leather is finished with a synthetic carboxylated rubber dispersion to which as much as 50% by weight of one or more oxides and/or hydroxides of divalent and/or trivalent metals may have been added, finishing being carried out by a process in which the carboxylated rubber dispersion is prepared by the emulsion feed method, with a conversion of more than 90%, in such a way that it contains from 20 to 60% by weight of carboxylated rubber which is soluble in dimethylformamide at room temperature.

Finishing leather with a synthetic carboxylated rubber dispersion

Nylons are prepared by a continuous process in which, in a precondensation zone, an aqueous solution of a salt of a dicarboxylic acid of 6 to 18 carbon atoms and a diamine of 6 to 18 carbon atoms is heated to 250.degree.-300.degree. C. under superatmospheric pressure, with simultaneous vaporization of water and formation of a prepolymer, the prepolymer and the vapor are separated, and the former is fed into a polycondensation zone and condensed under superatmospheric pressure of from 1 to 10 bar and at from 250.degree. to 300.degree. C., wherein the aqueous salt solution is condensed under superatomspheric pressure of from 1 to 10 bar in the first third of the tubular precondensation zone provided with baffles, until the degree of conversion is not less than 93%, and the prepolymer and the vapor phase are brought into intimate contact with one another in the remaining two thirds of the precondensation zone.

Continuous preparation of nylon from aqueous salt solution in

Nylons are prepared by a continuous process in which, in an evaporator zone, an aqueous solution of a salt of a dicarboxylic acid of 6 to 18 carbon atoms and a diamine of 6 to 18 carbon atoms is heated to 250.degree.-300.degree. C. under superatmospheric pressure, with simultaneous vaporization of water and formation of a prepolymer, the prepolymer and the vapors are separated continuously, the vapors are rectified and the entrained diamines are recycled, and the prepolymer is fed to a polycondensation zone and subjected to polycondensation under superatmospheric pressure of from 1 to 10 bar and at from 250.degree. to 300.degree. C., wherein the aqueous salt solution is heated under superatmospheric pressure of from 1 to 10 bar during a residence time of less than 60 seconds, with the proviso that, on leaving the evaporator zone, the degree of conversion is not less than 93% and the water content of the prepolymer is not more than 7% by weight.

Continuous preparation of nylon with diamine recycling

A process for the preparation of an amide-containing polyether comprises polycondensing a dihalobenzene compound, preferably bis-(4-chlorophenyl) sulfone or 4,4'-bis-(4'-chlorobenzoyl)-diphenyl ether, with an amide-containing bis-phenol of the formula HO-Ar.sup.1 -NHCO-Ar.sup.2 -CONH-Ar.sup.1 -OH where Ar.sup.1 is an aromatic radical of 6 to 12 carbon atoms and Ar.sup.2 is an aromatic radical of 6 to 12 carbon atoms or has the formula II ##STR1## where A.sup.1 is --SO.sub.2 --, --CO--, --C(CH.sub.3).sub.2 -- or 0 and n is 0 or 1, preferably 1,4-bis(4-hydroxybenzamido)-benzene, in the presence of an anhydrous alkali metal carbonate, and optionally in the presence of a bisphenol of the formula III ##STR2## where Ar.sup.1 and A.sup.1 have the above meanings and n and m are 0 or 1. The polyethers may be used to produce moldings, fibers, films, adhesives and coating materials.

Preparation of amide-containing polyethers

A glass-clear nylon based on aromatic dicarboxylic acids and dialicyclic diamines is prepared by polycondensing isophthalic acid with a mixture of 3,3'-dimethyl-4,4'-diamino-dicyclohexylmethane and hexamethylenediamine. The nylons may be used for the production of moldings, especially by injection-molding.

Glass-clear nylons from 3,3'-dimethyl PACM

A process for the preparation of high molecular weight linear saturated polyesters derived from dicarboxylic acids or their ester-forming derivatives and aliphatic and/or cycloaliphatic diols, comprising the condensation of polyester precondensates having a relative viscosity of from 1.05 to 1.15 at from 220.degree. to 280.degree. C. under reduced pressure, wherein

Preparation of linear high molecular weight saturated polyesters

Poly(alkylene terephthalate) molding materials which contain, as the stabilizer, a diepoxide of molecular weight from 200 to 2,000, and a catalyst which is an alkali metal salt of a chelating agent possessing one or more --N(CH.sub.2 --COO.sup.-).sub.2 groups in the molecule. Preferred catalysts are trisodium nitrilotriacetate and tetrasodium ethylenediaminetetraacetate. The molding materials may be used for the manufacture of moldings, films, monofilaments and fibers.

Stabilized poly(alkylene terephthalate) molding materials

Impact-resistant thermoplastic molding compositions containing from 70 to 98 percent by weight of a polyoxymethylene and from 30 to 2 percent by weight of a block copolymer of the general formula A -- B -- A, wherein A is a polyalkylene oxide block and B is a diene polymer block.

Thermoplastic molding compositions of high impact resistance

Thermoplastic molding compositions based on polyoxymethylene and containing, to improve the impact resistance, a block copolymer of a diene polymer block B and at least one poly(alkylmethacrylate) block A.

Thermoplastic molding compositions of polyoxymethylenes and glass fibers and containing from 0.1 to 5.0 per cent, by weight of the total weight of the mixture, of alkoxymethyl ureas having the formula ##EQU1## where R.sup.1 and R.sup.2 are the same or different and denote straight-chain or branched-chain alkyl of from 1 to 10 carbon atoms and R.sup.3 and R.sup.4 denote hydrogen or alkyl, or R.sup.3 and R.sup.4 are joined together to form a heterocyclic ring with the adjacent ureido group.

Growing community of inventors

Mannheim, Germany

Franz Schmidt