摘要:
Copolymers are described containing blocks of the structural repeat units of the formula I and blocks containing structural units of the formula II [—O—CH2—]x, (I) [—O—R1—], (II) where R1 is a divalent radical derived from a hydroxy-terminated aliphatic or cycloaliphatic oligomer or polymer which, where appropriate, has ether groups and/or carbonyloxy groups in the chain, and x is a whole number, at least 10. The copolymers may be used for producing moldings.
摘要:
Copolymers are described containing blocks of the structural repeat units of the formula I and blocks containing structural units of the formula II [—O—CH2—]x, (I) [—O—R1—], (II) where R1 is a divalent radical derived from a hydroxy-terminated aliphatic or cycloaliphatic oligomer or polymer which, where appropriate, has ether groups and/or carbonyloxy groups in the chain, and x is a whole number, at least 10.The copolymers may be used for producing moldings.
摘要:
Multiblock copolymers are described and contain the structural unit of formula I -A-O—R1—O—CO—(R2—CO—)m—X-D-X—(CO—R2)m—CO—X— (I), where A is a radical derived from a homo- or copolyoxymethylene, R1 is an alkylene radical-having at least two carbon atoms or a cycloalkylene radical, R2 is a direct carbon-carbon bond, or an alkylene, cycloalkylene, arylene, or aralkylene radical, X is selected from —O—, —S—, or —NH—, D is a divalent radical B which is a radical of a hydroxy-terminated, mercaptan-terminated, or amino-terminated polymer which derives from polyalkylene glycols, polyvinyl ethers, polyvinyl ether-alkene copolymers, polyvinyl esters, polyvinyl ester-alkene copolymers, polyvinyl alcohols, polyvinyl alcohol-alkene copolymers, polyvinylaromatics, polyacrylates, polymethacrylates, polyacetals, polycarbonates, polyesters, polyamides, polyimines, polyetherester elastomers, polyetheramide elastomers, polyalkadienes, polyurethanes, polyureas, polysiloxanes, or a triblock copolymer radical -PAO-B-PAO-, where B assumes one of the above meanings and PAO is a polyalkylene oxide radical, and m is 0 or 1. The multiblock copolymers may be used to produce moldings.
摘要:
Copolymers are described containing blocks of the structural repeat units of the formula I and blocks containing structural units of the formula II [—O—CH2—]x (I), [—O—R1—] (II), where R1 is a divalent radical derived from a hydroxy-terminated aliphatic or cycloaliphatic oligomer or polymer which, where appropriate, has ether groups and/or carbonyloxy groups in the chain, and x is a whole number, at least 10. The copolymers may be used for producing moldings.
摘要:
Molding materials and the moldings produced therefrom, containing a) polyoxymethylene in which at least 50% of the terminal groups are hydroxyl groups, which has a melt volume rate MVR of less than 20 cm3/10 minutes, measured according to ISO 1133 at 190° C. and 2.16 kg, and whose proportion of low molecular weight constituents having low molecular weights below 10 000 dalton is less than 15% by weight, based on the total mass of the polyoxymethylene, and b) a thermoplastic elastomer, are described.The moldings produced from these molding materials are distinguished by a very high notch impact strength.
摘要:
The invention relates to moldings or molding compositions composed of polyoxymethylene and featuring very low formaldehyde emission, comprising from 0.1 to 50.0% by weight of a tribological modifier, from 0.01 to 0.5% by weight of a cyclic stabilizer which contains at least one nitrogen atom in the ring, and from 0.05 to 1% by weight of at least one ester composed of a polyhydric alcohol and of at least one (C10-C32) fatty acid, and also to their production and use.
摘要:
Homo- or copolyoxymethylenes are described and contain the repeat structural unit of formula I -A-O—R1—O—CO—(R2—CO—)m—O— (I), where A is a radical derived from a homo- or copolyoxymethylene, R1 is an alkylene radical having at least two carbon atoms, or a cycloalkylene radical, R2 is a direct carbon-carbon bond, or an alkylene, cycloalkylene, arylene, or aralkylene radical, and m is 0 or 1. These polymers may be prepared by reacting end-group-functionalized homo- or copolyoxymethylenes with selected chain-linking agents. The reaction products can be used to produce moldings.
摘要:
Compositions are described comprising a) polyoxymethylene, b) thermoplastic elastomer having active hydrogen atoms, c) polyoxymethylene which differs from component a) and contains active hydrogen atoms, d) reagent for covalent coupling of components b) and c), and e) if appropriate, another impact modifier, which differs from component b). The compositions feature improved toughness and can be used for production of moldings.
摘要:
The present invention relates to novel molding compositions based on semicrystalline engineering thermoplastics which, in conventional processing techniques, give moldings with reduced surface gloss. A feature of the molding compositions is that they comprise, in a polymer matrix, if appropriate with the usual additives, polymer particles with a median size d50 of from 0.1 μm to 100 μm, and comprise at least one other incompatible or semicompatible polymer which has not been chemically crosslinked, and also, if appropriate, comprise salt-like additives. The invention further relates to moldings which are produced by means of conventional processing techniques, in particular via injection molding, from these matt-effect molding compositions.
摘要:
An air outlet device for a vehicle, especially for an aircraft, comprises a nozzle body with an air intake opening and an air outlet opening. The air outlet device further comprises a holding element formed with an accommodating opening having the nozzle body supported therein for rotation about a longitudinal axis extending through the air intake opening and the air outlet opening, and a valve body arranged coaxially within the nozzle body and guided by the holding element. Upon rotation of the nozzle body, the valve body can be displaced in the nozzle body between a closing position for blocking the air outlet opening and a maximum opening position for clearing the air outlet opening to the maximum extent. The valve body is of a hollow configuration.