Abstract: A process for making an oxymethylene polymer comprising polymerizing at least one compound capable of forming —CH2O— repeat units (monomer) in the presence of at least one ester of the general formula I (ester): R1—CO—O—R2 (I) wherein R1 can be hydrogen, wherein R1 and R2 are independently of each other linear or branched C1 to C10 alkyl C5 to C7 cycloalkyl —[R3-0-]nR4 wherein R3 is a linear or branched C2 to C5 alkylen and R4 is a linear of branched C1 to C5 alkyl and n is an integer of from 1 to 5. and in the presence of at least one Lewis acid.

Abstract: The present invention relates to a process for preparing dioxolane by reacting ethylene glycol with an aqueous solution of formaldehyde in the presence of an acid catalyst. The raw product comprising water, dioxolane and methanol is fed to a phase separation unit (20) wherein an organic extracting agent is present. An organic fraction stream from the phase separation unit is transferred to an upper part of a purification column (30) from which dioxolane is withdrawn as a bottom product while the distillate stream of the purification column is recycled to the phase separation unit.

Abstract: The present invention relates to a process for preparing dioxolane by reacting ethylene glycol with an aqueous solution of formaldehyde in the presence of an acid catalyst. The raw product comprising water, dioxolane and methanol is fed to a phase separation unit (20) wherein an organic extracting agent is present. An organic fraction stream from the phase separation unit is transferred to an upper part of a purification column (30) from which dioxolane is withdrawn as a bottom product while the distillate stream of the purification column is recycled to the phase separation unit. An aqueous fraction stream from the phase separation unit is transferred to a waste water column (40), withdrawing a waste water stream from the bottom of the waste water column, recycling a distillate stream (42) from the waste water column to the phase separation unit, and withdrawing a side stream (43) containing methanol from a stage below the feed stage of the waste water column.

Abstract: The invention relates to a method for the combined processing of at least two polymer melts selected from the group consisting of (M1), (M2) and (M3), wherein (M1) is a polymer melt comprising a terephthalate polyester (A1), (M2) is a polymer melt comprising a copolyester (A2) on the basis of terephthalic acid, at least one aliphatic, ?-dicarboxylic acid and at least one aliphatic 1,?-diol, and (M3) is a polymer melt 0 comprising a copolyester (A3) on the basis of terephthalic acid, at least one polytetramethylene glycol and at least one aliphatic 1,?-diol. The method comprises the alternating processing of the at least two polymer melts into at least one product selected from the group consisting of pellets (P1), fibers (P2), expanded particles (P3), preforms (P4) and articles (P5).

Abstract: The present invention relates to a method for the combined production of at least two target products selected from the group consisting of (T1), (T2) and (T3), wherein (T1) is a terephthalate polyester, (T2) is a copolyester on the basis of terephthalic acid, at least one aliphatic 1,?-dicarboxylic acid and at least one aliphatic 1,?-diol, and (T3) is a copolyester on the basis of terephthalic acid, polytetramethylene glycoland at least one aliphatic 1,?-diol.

Abstract: The present invention relates to a process for preparing dioxolane by reacting ethylene glycol with an aqueous solution of formaldehyde in the presence of an acid catalyst. The raw product comprising water, dioxolane and methanol is fed to a phase separation unit (20) wherein an organic extracting agent is present. An organic fraction stream from the phase separation unit is transferred to an upper part of a purification column (30) from which dioxolane is withdrawn as a bottom product while the distillate stream of the purification column is recycled to the phase separation unit. An aqueous fraction stream from the phase separation unit is transferred to a waste water column (40), withdrawing a waste water stream from the bottom of the waste water column, recycling a distillate stream (42) from the waste water column to the phase separation unit, and withdrawing a side stream (43) containing methanol from a stage below the feed stage of the waste water column.

Abstract: The present invention relates to a process for preparing dioxolane by reacting ethylene glycol with an aqueous solution of formaldehyde in the presence of an acid catalyst. The raw product comprising water, dioxolane and methanol is fed to a phase separation unit (20) wherein an organic extracting agent is present. An organic fraction stream from the phase separation unit is transferred to an upper part of a purification column (30) from which dioxolane is withdrawn as a bottom product while the distillate stream of the purification column is recycled to the phase separation unit.

Abstract: The present invention relates to a method for the deactivation of an acid catalyst during the production process of a polyoxymethylene copolymer (cPOM) by adding triisopropanolamine (tris(2-hydroxypropyl)amine) to a mixture which comprises the polyoxymethylene copolymer (cPOM) and the acid catalyst.

Abstract: The present invention relates to a process for energy recovery in a process for the preparation of 1,3,5-trioxane.

Abstract: The present invention relates to a method for the production of a colored polyoxymethylene copolymer by mixing a raw polyoxymethylene copolymer in particulate form, comprising 2 to 30% by weight of unreacted residual monomers, with a coloring agent in particulate form, in a degassing apparatus. In addition, the present invention relates to the colored polyoxymethylene copolymer obtainable by the process and the use of the colored polyoxymethylene copolymer for the production of molding parts.

Abstract: The present invention relates to a process for energy recovery in a process for the preparation of 1,3,5-trioxane.

Abstract: A motor-adjustable steering column may include a support unit that is connectable to a vehicle body and holds an adjustment unit. The adjustment unit may include a steering spindle mounted in a casing unit rotatably about a longitudinal axis. The casing unit may include an outer casing tube that receives an inner casing tube in an axially displaceable, telescopic fashion. An adjustment drive may be connected to the inner and outer casing tubes. The inner casing tube can be retracted and deployed axially relative to the outer casing tube. An intermediate casing tube may be disposed coaxially between the inner and outer casing tubes so as to be axially displaceable in telescopic fashion relative to the inner and outer casing tubes. The intermediate casing tube can be axially retracted and deployed relative to the inner and outer casing tubes by the adjustment drive.

Abstract: A process for making an oxymethylene polymer comprising polymerizing at least one compound capable of forming —CH2O— repeat units (monomer) in the presence of at least one ester of the general formula I (ester): R1—CO—O—R2 (I) wherein R1 can be hydrogen, wherein R1 and R2 are independently of each other linear or branched C1 to C10 alkyl C5 to C7 cycloalkyl —[R3-0-]nR4 wherein R3 is a linear or branched C2 to C5 alkylen and R4 is a linear of branched C1 to C5 alkyl and n is an integer of from 1 to 5. and in the presence of at least one Lewis acid.

Abstract: The invention relates to a process for production of expanded foam beads of one or more polyesters based on aliphatic or aliphatic and aromatic dicarboxylic acids and aliphatic diols, comprising the steps of: (a) melting the polyester and admixing the polyester with 1 to 3.5 wt %, based on the polyester, of a carbon dioxide and/or nitrogen blowing agent and also 0.1 to 2 wt % of a nucleating agent, and pressing the nucleated polyester melt, containing blowing agent, through a perforated disk controlled to a temperature between 150° C. and 185° C. and into a pelletizing chamber, (b) using a cutting device to comminute the polymer melt pressed through the perforated disk into individual expanding pellets, (c) discharging the pellets from the pelletizing chamber into a stream of water which is at a temperature of 5 to 90° C. and a pressure of 0.1 bar to 20 bar above ambient pressure.

Abstract: The invention relates to a steering column for a motor vehicle comprising a steering shaft which is mounted in a steering shaft mounting unit and is rotatable about a longitudinal axis, and comprising a support unit for connecting the steering shaft mounting unit to the body of the motor vehicle. At least one component of the steering column is composed at least partially of a fiber-reinforced composite material and the component lies in the flux of force between the steering column and the body. The component is provided with at least one pultrusion layer which has multiple fibers produced by pultrusion as reinforcing fibers, said fibers being oriented parallel to one another in the direction of the longitudinal axis.

Abstract: A motor-adjustable steering column may include a support unit that is connectable to a vehicle body and holds an adjustment unit. The adjustment unit may include a steering spindle mounted in a casing unit rotatably about a longitudinal axis. The casing unit may include an outer casing tube that receives an inner casing tube in an axially displaceable, telescopic fashion. An adjustment drive may be connected to the inner and outer casing tubes. The inner casing tube can be retracted and deployed axially relative to the outer casing tube. An intermediate casing tube may be disposed coaxially between the inner and outer casing tubes so as to be axially displaceable in telescopic fashion relative to the inner and outer casing tubes. The intermediate casing tube can be axially retracted and deployed relative to the inner and outer casing tubes by the adjustment drive.

Abstract: Fiber composite components can be formed by winding fibers along tracks of a winding spool of a winding core. The fibers may either be pre-coated with a curable resin, or the curable resin may be applied to the fibers after the fibers are wound along the tracks of the winding spool of the winding core. The curable resin may also and/or alternatively be applied to a mold that receives the fibers wound about the winding spool. The curable resin may then be cured, after which the winding spool and the winding core may be removed in order to release the fiber composite component. In some cases, the winding spool may be removed from the fiber composite component by moving the winding spool inwardly towards an inside of the winding core.

Abstract: A steering-column assembly for a motor vehicle may include a steering spindle rotatably mounted in a steering-column tube, which steering-column tube is mounted in a console that connects the steering-column directly or indirectly to a body of the motor vehicle. At least one of the components of the steering-column, such as the console, for example, may include a fiber composite component that can be formed by winding fibers along tracks of a winding spool of a winding core, introducing a curable resin into the fibers or a mold to be used with the wound fibers, curing the wound fibers, and removing the winding spool and the winding core so as to release the fiber composite component. The fiber composite component may then be fitted into the steering column assembly.

Abstract: The invention relates to a steering column for a motor vehicle comprising a steering shaft which is mounted in a steering shaft mounting unit and is rotatable about a longitudinal axis, and comprising a support unit for connecting the steering shaft mounting unit to the body of the motor vehicle. At least one component of the steering column is composed at least partially of a fibre-reinforced composite material and the component lies in the flux of force between the steering column and the body. The component is provided with at least one pultrusion layer which has multiple fibres produced by pultrusion as reinforcing fibres, said fibres being oriented parallel to one another in the direction of the longitudinal axis.

Abstract: The invention relates to a steering column for a motor vehicle comprising a steering shaft which is mounted in a steering shaft mounting unit and is rotatable about a longitudinal axis, and comprising a support unit for connecting the steering shaft mounting unit to the body of the motor vehicle. At least one component of the steering column is composed at least partially of a fiber-reinforced composite material and the component lies in the flux of force between the steering column and the body. The component is provided with at least one pultrusion layer which has multiple fibers produced by pultrusion as reinforcing fibers, said fibers being oriented parallel to one another in the direction of the longitudinal axis.