Abstract: The invention relates to an improved method for producing polysulfones, in particular polyethersulfones (PES) and polyphenylene sulfones (PPSU), where N-methylpyrrolidone (NMP) or/and N-ethylpyrrolidone (NEP) is/are used as solvent/as solvents. The invention also relates to the obtained polysulfones that have a higher glass transition temperature, molded articles produced therefrom, and use thereof.

Abstract: The present invention relates to an improved method for the production of polysulfones, in particular for the production of polyether sulfones (PESU) and polyphenylene sulfones (PPSU), the solvent being N-methylpyrrolidone (NMP) or/and N-ethylpyrrolidone (NEP).

Abstract: The invention relates to semi crystalline, melt processible, partially aromatic copolyamides, producible by condensation of at least the following monomers or the precondensates thereof: a) terephthalic acid b) at least one dimerised fatty acid with up to 44 carbon atoms and c) at least one aliphatic diamine of the formula H2N—(CH2)x—NH2, wherein x means a whole number from 4-18.

Abstract: The invention relates to a polymer mixture of partially crystalline aliphatic polyamides and partially aromatic polyamides, the proportion of aliphatic polyamides being more than 50% by weight and the quantitative ratio of the aliphatic carbon atoms to amide bonds in the aliphatic polyamides being in the range of 8:1 to 12:1 and the partially aromatic polyamides, which are present in deficit, having, in addition to hexamethyleneterephthalamide (6T) units, further partially aromatic and/or aliphatic amide units and being predominantly partially crystalline. The invention relates furthermore to the use of polymer mixtures of this type for various application fields, in particular for express couplings or connectors for fuel lines.

Abstract: The invention relates to semi crystalline, melt processible, partially aromatic copolyamides, producible by condensation of at least the following monomers or the precondensates thereof: a) terephthalic acid b) at least one dimerised fatty acid with up to 44 carbon atoms and c) at least one aliphatic diamine of the formula H2N—(CH2)x—NH2, wherein x means a whole number from 4-18.

Abstract: The invention relates to a polymer mixture of partially crystalline aliphatic polyamides and partially aromatic polyamides, the proportion of aliphatic polyamides being more than 50% by weight and the quantitative ratio of the aliphatic carbon atoms to amide bonds in the aliphatic polyamides being in the range of 8:1 to 12:1 and the partially aromatic polyamides, which are present in deficit, having, in addition to hexamethyleneterephthalamide (6T) units, further partially aromatic and/or aliphatic amide units and being predominantly partially crystalline. The invention relates furthermore to the use of polymer mixtures of this type for various application fields, in particular for express couplings or connectors for fuel lines.

Abstract: The invention is relative to weather-resistant polyamides and to methods of their production in which the polymerization or polycondensation of the polyamide-forming monomers (I) is carried out in the presence of 0.02 to 0.7% by weight 4-amino-2,2,6,6-tetraalkylpiperdine (II), 0 to 0.5% by weight of an aliphatic or cycloaliphatic diamine (III) carrying a primary and a tertiary amino group and 0.02 to 0.7% by weight of a 2,6-dialkylphenol (IV) functionalized in 4-position to the OH group and with the formula ##STR1## in which R.sup.1 and R.sup.2 are the same or different alkyl groups with 1 to 6 C atoms, R.sup.3 is either a hydrogen atom or a methyl group, functional group A represents either a free carboxyl group or a carboxyl group esterified with C.sub.1 -C.sub.

Abstract: The invention is directed to a hydrolytically polymerized polycaprolactam with new chain regulation, whereby the polymerization of caprolactam (I) is carried out with 0.1-0.7 weight percent of an aromatic dicarboxylic acid (II), 0.01-0.7 weight percent of an aliphatic or cycloaliphatic diamine (III) that carries a primary and a tertiary amino group, and/or 0.01-0.7 weight percent 4-amino-2,2,6,6-tetraalkyl piperidine (IV), whereby the quantities of constituents I through IV add up to 100 weight percent and the quantity of the constituents III and/or IV amounts to 0.01-0.7 weight percent.

Abstract: A process for producing precondensates of partially crystalline or amorphous, thermoplastically processable, partially aromatic polyamides or copolyamides, and the use of the higher molecular weight of polyamides, accessible from the precondensates, for producing molding compositions, which are further processable by means of suitable processing techniques, involves the control of temperature and water vapor partial pressure, in a batch process.

Abstract: Thermoplastically processable elastomeric block copolyetheresteretheramides from recurring units of the formula ##STR1## in which ##STR2## represents a polyamide segment containing terminal carboxyl groups and having an average molar mass of 700 to 10,000,--O--E--O-- is a poly-(oxytetramethylene)-segment having an average molar mass of 600 to 3,500,--NH--F--NH-- represents a poly-(oxy-1,2-propylene)-segment containing terminal amino groups and having an average molar mass of 350 to 2,500,x and y are integers from 3 to 35 and indicate the number of the respective, randomly arranged, recurring units, the ratio x:y of components A and B varying between 5:1 and 1:5.The ether amides of the present invention can optionally be mixed with additives, fillers, modifiers, or other compatible polymers normally used in tile processing of polyamides and which are suitable for the production of molded articles, for example by injection molding, coinjection, extrusion, blow molding, etc.

Abstract: Thermoplastically processable elastomeric block copolyetheresteretheramides from recurring units of the formula ##STR1## in which ##STR2## represents a polyamide segment containing terminal carboxyl groups and having an average molar mass of 700 to 10 000, --O--E--O-- is a poly-(oxytetramethylene)-segment having an average molar mass of 600 to 3 500, --NH--F--NH-- represents a poly-(oxy-1,2-propylene)-segment containing terminal amino groups and having an average molar mass of 350 to 2 500, x and y are integers from 3 to 35 and indicate the number of the respective, randomly arranged, recurring units, the ratio x:y of components A and B varying between 5:1 and 1:5.The ether amides of the present invention can optionally be mixed with additives, fillers, modifiers, or other compatible polymers normally used in the processing of polyamides and which are suitable for the production of molded articles, for example by injection molding, coinjection, extrusion, blow molding, etc.

Abstract: A method for the preparation of block polyurethane amides in a melt by the reaction of(a) a linear polyamide having terminal carboxylic acid ester groups and which melts at not more than 210.degree. C.; and(b) a polyurethane having hydroxyl groups at its chain ends;at a temperature of 160.degree. C. to 240.degree. C., and in the presence of a trans-esterification accelerator.

Abstract: Hydrolysis-stable, thermoplastic block polyetheresteramides are produced by a catalyzed polycondensation of linear, aliphatic polyamides having carboxyl end groups with .alpha.,.omega.-dihydroxypolyethers and additionally, a linear or branched, aliphatic or cycloaliphatic diol having 2-8 carbon atoms in an amount of 3-30 mol %, relative to the sum of the moles of both other starting materials. The ratio of the moles of the polyamide components to the sum of the moles of the dihydroxypolyether and diol components is 0.81 to 0.985.

Abstract: A process for the manufacture of thermoplastic block polyetheresteramides by polycondensation of linear polyamides having carboxyl end groups with approximately equimolar quantitites of .alpha.,107 -dihydroxypolyethers in the presence of organic or inorganic stannous compounds as esterification catalysts. Preferred polyamide-forming materials include the monomers of PA-6, PA-11, PA-12, PA-6.6, PA-6.9, PA-6.10, PA-6.12, PA-6.13, or mixtures thereof and linear and branched aliphatic, aromatic, and cycloaliphatic dicarboxylic acids. The molecular weight of the polyamides used is 700-15,000, and that of the dihydroxypolyethers is 400-4,000. Polycondensation takes place at atmospheric or reduced pressure and at temperatures of 210.degree.-280.degree. C.