摘要:
For the preparation of polyarylene ether ketones by Friedel-Crafts polycondensation, a reaction mixture consisting ofA. a monomer system,B. a Lewis acid,C. if required, a Lewis base andD. an inert solventis subjected to polycondensation in two reaction zones, discharged from the second reaction zone with plug flow and compounded. The reaction mixture is subjected to polycondensation in the first reaction zone while stirring to a viscosity of about 2,000 mPa.s, is transferred to the second reaction zone and is discharged therefrom by means of an inert solvent or of an inert gas saturated with the solvent, under from about 6 to 65, preferably from 10 to 25, bar, the transport pressure being reduced in at least two stages and the pressure reduction in the first stage being not more than 60%.
摘要:
Process for purifying and cooling a gas stream comprising a dialkyl ester A) of an aromatic dicarboxylic acid, which comprises treating the gas stream with an aliphatic dihydroxy compound B) at a temperature less than/equal to the melting point of the dialkyl ester A) in a 1st stage and treating the gas stream with an aliphatic dihydroxy compound B) at above the melting point of the dihydroxy compound B) in at least one 2nd stage.
摘要:
The invention relates to a steering column for a motor vehicle with a steering spindle pivotably supported by a jacket unit and a securement unit rigidly securable on the motor vehicle and bearing the jacket unit. The securement unit includes a base section, at least one side jaw extending next to the jacket unit, and at least first and second securement plates with bolt openings for the securement of the securement unit on the motor vehicle by means of securement bolts. The first and second securement plates are each inclined with respect to the at least one side jaw by an angle in the range between 15° and 75°, and preferably between 30° and 60°.
摘要:
Polymer dihydroxy compounds corresponding to the following formula ##STR1## in whichR.sup.1, R.sup.2, R.sup.3 =H or C.sub.1 -C.sub.4 alkyl,R.sup.4 =H or C.sub.1 -C.sub.4 alkyl,R.sup.5 =--C.sub.6 H.sub.5, --C.sub.6 H.sub.4 CH.sub.3, --CH.dbd.CH.sub.2, or --CO.sub.2 R.sup.7,R.sup.6 =C.sub.1 -C.sub.4 alkyl, aryl, or H,R.sup.7 =C.sub.1 -C.sub.4 alkyl,m=0 or 1,n=5 to 100,q=0 or 1,a process for their production and their use in thermoplastic molding compositions.
摘要翻译:对应于下式的化合物二羟基化合物,其中R1,R2,R3 = H或C1-C4烷基,R4 = H或C1-C4烷基,R5 = -C6H5,-C6H4CH3,-CH = CH2或 - CO 2 R 7,R 6 = C 1 -C 4烷基,芳基或H,R 7 = C 1 -C 4烷基,m = 0或1,n = 5〜100,q = 0或1,其制备方法及其在热塑性成型 组合物。
摘要:
Thermoplastic molding compositions compriseA) from 5 to 97.9% by weight of a vinylaromatic polymer with syndiotactic structure,B) from 2 to 90% by weight of a low-viscosity polyamide with a viscosity number VN in the range from 50 to 150 ml/g andC) from 0.1 to 50% by weight of a polar-group-modified polyphenylene ether.
摘要:
The invention relates to a steering column for a motor vehicle comprising a steering spindle, which is mounted rotatably about its axis in a steering spindle bearing unit, a holding part, which is designed to connect the steering spindle bearing unit directly or indirectly to the body of the motor vehicle, wherein at least one of the components of the steering column is at least partially formed from a material that contains reinforcing fibers, wherein the reinforcing fibers are arranged along paths on a wall surface and, by means of multiple holding fibers, which run at an angle that is greater than 0° in relation to the paths of the reinforcing fibers and enclose the reinforcing fibers, are fixed on the wall surface.
摘要:
A fixing device has at least one clamping device and at least one locking element which can be acted upon by the clamping device, and at least one counter locking element. In a closed position of the clamping device, the locking element and the counter locking element are arranged in an engagement position, and the fixing device has at least one elastic resetting element for resetting the locking element in an open position of the clamping device. The fixing device has at least one engagement element which, in the closed position of the clamping device, is in engagement by preferably plastic deformation of at least one surface of the locking element and/or of the counter locking element in a form-fitting manner with the surface.
摘要:
Process for purifying and cooling a gas stream comprising a dialkyl ester A) of an aromatic dicarboxylic acid, which comprises treating the gas stream with an aliphatic dihydroxy compound B) at a temperature less than/equal to the melting point of the dialkyl ester A) in a 1st stage and treating the gas stream with an aliphatic dihydroxy compound B) at above the melting point of the dihydroxy compound B) in at least one 2nd stage.
摘要:
Thermoplastic molding compositions comprise A) from 20 to 99% by weight of a polyester, up to 90% by weight of which may be replaced by a polycarbonate or a polyamide, B) from 0.1 to 7% by weight of a carbodiimide of the formula I ##STR1## where R.sup.1 are identical or different radicals selected from the group consisting of --NCO, --NHCONHR.sup.5, --NHCONR.sup.5 R.sup.6 and --NHCOOR.sup.7, where R.sup.5 , R.sup.6 are identical or different and are alkyl, cycloalkyl or aralkyl, R.sup.7 is the same as R.sup.5 or is alkoxy(poly)oxyalkylene and R.sup.2 , R.sup.3 are identical or different aliphatic radicals having from 1 to 18 carbon atoms or cycloaliphatic radicals having from 5 to 15 carbon atoms or aromatic radicals having from 6 to 15 carbon atoms, R.sup.4 are identical or different aliphatic radicals having from 2 to 20 carbon atoms or halogen or alkoxy, x is an integer from 0 to 4 and n is an integer from 0 to 10, C) from 0 to 75% by weight of conventional additives and processing aids, where the sum of the percentages by weight of components A) to C) is 100%.
摘要:
Process for purifying and cooling a gas stream comprising a dialkyl ester A) of an aromatic dicarboxylic acid, which comprises treating the gas stream with an aliphatic dihydroxy compound B) at above the melting point of the dialkyl ester A) in a 1st stage and treating the gas stream with an aliphatic dihydroxy compound B) at above the melting point of the dihydroxy compound B) in at least one 2nd stage.