Abstract: Polyamide polyalkyl(meth)acrylate block copolymers which are built from polyamide generating monomers in addition to 15-70 weight percent polyalkyl(meth)acrylates as well as products produced from same. The block copolymers are produced by producing polyamide or copolyamide blocks with an average molar mass in the range between 500 and 5,000 g/Mol with an amino end group in a first polymerization or polycondensation step and degassing in order to reduce the water content; adding, in a second step, ?,?-functionalized polyalkyl(meth)acrylate diols; and fully condensing the reaction mixture into high-molecular block copolymer (A) at a reduce pressure in a further polycondensation step; discharging it, or further processing it into molding bodies.

Abstract: A catalyst solution for the anionic polymerization of lactones and/or lactams comprises a salt of at least one compound of the general formula I In this formula (I), R1 is H or an aliphatic, cycloaliphatic or aromatic radical with 1 to 12 C atoms which can also have heteroatoms or hetero groups, the radical R2, which is the same or different, is H, halogen, C1–C5-alkyl, ethoxy or wherein said solvation agent S comprises N-methylpyrrolidone, N-octylpyrrolidone, N-cyclohexylpyrrolidone, N-octylcaprolactam, tetrabutyl urea or mixtures thereof methoxy, and n=1, 2 or 3, and wherein the salt is dissolved in an aprotic solvation agent S.

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 solution of an alkali salt, which is strongly basic, clear, stable in storage and liquid at room temperature, of aniline, amidated with a monocarboxylic acid, or its derivatives in an aprotic solvation agent, a method for production thereof and the polyamides produced using this solution.

Abstract: Polyamide polyalkyl(meth)acrylate block copolymers which are built from polyamide generating monomers in addition to 15-70 weight percent polyalkyl(meth)acrylates as well as products produced from same. The block copolymers are produced by producing polyamide or copolyamide blocks with an average molar mass in the range between 500 and 5,000 g/Mol with an amino end group in a first polymerization or polycondensation step and degassing in order to reduce the water content; adding, in a second step, &agr;,&ohgr;-functionalized polyalkyl(meth)acrylate diols; and fully condensing the reaction mixture into high-molecular block copolymer (A) at a reduce pressure in a further polycondensation step; discharging it, or further processing it into molding bodies.

Abstract: The invention concerns a softener-free polyamide prepared by polycondensation and/or polymerization of polyamide-forming monomers, wherein it was obtained by adding 5-50 wt. % of a dimer diol with a molecular weight within the range of 400-1000 and/or corresponding OH-terminated polyesters.

Abstract: This invention relates to adhesion agents and compatibility agents, respectively, on the basis of partially crystalline, high-molecular block (co)polyester amides, produced by direct esterification of carboxyl-terminated or hydroxycarboxyl-terminated polyamide precondensates and hydroxyl-terminated or hydroxycarboxyl-terminated polyester segments, characterized in that the block (co)polyester amides form two crystalline phases and comprise as segments(A) at least one polyamide or copolyamide block having a uniform number average molar mass of at least 1000 g/mole,(B) at least one aromatic polyester and/or copolyester block having a uniform number average molar mass of at least 1000 g/mole, and(C) at least one further diol component of the general structureHO--R--OH,wherein R is selected from the group consisting of aliphatic or partially aromatic (co)polyesters, aliphatic polyethers, aliphatic (co)polyester amides, polycarbonates or aliphatic or aromatic hydrocarbons.

Abstract: This invention relates to biologically degradable, partially crystalline block copolyester-polyamides comprising at least two chemically differently structured segments of which at least one is a polyester (PES) block or a copolyester (coPES) block, preferably with a number average molecular mass of 340 to 10,000 g/mole, and at least one is a polyamide (PA) block or a copolyamide (coPA) block, preferably with a number average molecular mass of 400 to 3,000 g/mole. In addition, copolyester-amide (coPEA) blocks can be employed, preferably with a number average molecular mass of 500 to 5,000 g/mole. The invention also relates to a polycondensation process for the manufacture of these partially crystalline block copolyester-polyamides. The block copolymers described are useful for the manufacture of fibers, foils, molded articles and hot melt-type adhesives. Molded components manufactured from the copolymers in accordance with the invention are biologically degradable and are capable of being composted.

Abstract: A thermally insulating lining for the housing of the heater system ensures that on the outside of the heater system only low temperatures are reached which are not dangerous to operators in the vicinity of the engine. Combustion air duct means between an air preheater and a burner is formed by a large number of tubes arranged alongside each other in at least one row and along an inside wall of the combustion chamber. These tubes ensure that the flow state remains satisfactory and constant and they are substantially more durable than sheet metal duct means as used hitherto.

Abstract: A thermally insulating lining for the housing of a heater system for a Stirling, or hot air engine ensures that only safe temperature will be reached on the outside of the heater system. The insulating lining is arranged in two parts. An insulating wall is made up of individually adjacentely placed, replaceable insulating elements in the form of ceramic tiles, and/or ceramic tubes, and an intermediate space between the tiles and the outer wall. The intermediate space is separated, if desired, from the insulating elements by a ceramic paper. The intermediate space is packed with ceramic fiber batts, or loose, lump ceramic insulating material.

Abstract: The temperature of the working gas in the heating chamber of each of a number of cylinders is continuously measured. An electronic selection circuit selects the lowest measured temperature as a control parameter by which the speed of a blower in the common air supply is controlled for providing an air flow proportional to blower speed. A pressure-detecting device measures the air flow through a pressure converter provides an electrical signal that normally controls the valves of the respective fuel supplies for the combustion chambers of the cylinders, but a monitoring device for each cylinder compares the measured working gas temperature with a pre-set maximum value so that when the maximum value is exceeded, the fuel supply valve is changed over to control by the output of the monitoring device, to reduce the fuel supply until the maximum temperature is no longer exceeded in that cylinder.