摘要:
A process for treating the working surfaces of equipment used in the production and processing of polycarbonate is disclosed. The thermal treatment in an oxidative atmosphere results in resin and molded articles having improved optical quality.
摘要:
The invention relates to a process for the preparation of polycarbonate by the melt transesterification method, polycarbonate having a small buildup of electrostatic charge and obtainable by this process and shaped articles or extrudates, in particular optical data stores or diffuser discs, comprising this polycarbonate.
摘要:
The present invention relates to polycarbonate, polyester carbonate and polyester having end groups derived from alkylsiloxane-substituted phenols, as well as to the use of phenolic compounds having alkylsiloxane substituents as chain terminators in the preparation of polycarbonate, polyester carbonate and polyester, as well as to mouldings and extrudates produced from these polymers, to processes for the preparation of the polymers, and to novel phenolic compounds of formula (2).
摘要:
A process for purifying polycarbonate is disclosed. The process entails filtering molten polycarbonate having weight average molecular weight of 14,000 to 30,000 g/mol through at least one non-woven metal structure having a thickness of 5 to 1 mm, said structure including at least one dense layer, and at least one less dense layer wherein said dense layer is 0.05 to 0.2 mm thick and has pore size of 1 to 10 μm to obtain pure polycarbonate.
摘要:
A phenolic compound having a branched structure is disclosed. The compound conforms to HO—Ar1—X—Ar2—[Y—W]n (1) wherein Ar1 and Ar2 independently denote an optionally substituted mononuclear or polynuclear aromatic moiety, X and Y independently denote a single bond or a divalent radical, W denotes an optionally substituted mononuclear or polynuclear aromatic moiety or an aliphatic or cycloaliphatic radical, and n is 1 to 5, is useful as a terminal group in polycarbonates, polyester carbonates and polyesters. Also disclosed is a process for producing such resins where the disclosed compound is a chain terminator.
摘要:
The present invention relates to a composition comprising, (a) a transparent or translucent polymer or polymer blend in an amount which together with components b) to g) gives 100 wt. %, (b) optionally 0 ppm to 2500 ppm of one or more stabilizers, (c) 0.001 ppm to 10,000 ppm of at least one dye comprising structure 1a and/or 1b, (d) 0.001 ppm to 10,000 ppm of at least one dye selected from the group consisting of dyes differing from dyes having structure 1a and/or 1b based on perinone or indanthrone and dyes based on a phthalocyanine or phthalocyanine complex, (e) optionally 0 ppm to 3000 ppm of one or more release agents, (f) optionally 0 ppm to 6000 ppm of one or more UV absorbers, and (g) optionally 0 ppm to 500,000 ppm of one or more further additives.
摘要:
A transport device for slabs, which device is arranged between at least two casting machines and at least one rolling mill. The transport device has at least two linear and stationary conveyor sections on which a slab can be conveyed in a conveying direction. The transport device further has at least two linear conveyor sections which are arranged to be pivotable in order to convey a slab at an angle to the conveying direction. In order to improve guidance of the slabs and provide a flexible transport of the slabs from the casting machines to the rolling mill, the at least two linear, pivotable conveyor sections are arranged to be pivotable independently of one another.
摘要:
The present invention relates to a polymer composition which absorbs infrared (IR) radiation, containing a transparent thermoplastic plastic, an inorganic infrared absorber and at least one inorganic nano-scale pigment, and to the preparation and use of the polymer compositions according to the invention, and to products produced therefrom. In particular, the present invention relates to polymer compositions comprising a. at least one transparent thermoplastic material; b. at least one inorganic IR absorber which comprises a tungsten compound and wherein the IR absorber is present in an amount of from 0.0075 wt. % to 0.0750 wt. %, calculated as solids content of tungstate in the total composition; and c. at least one inorganic, nano-scale pigment present in an amount of from 0.0005 wt. % to 0.0035 wt. %, based on the total composition; and d. optionally further additives.
摘要:
The invention relates to compositions containing polycarbonate and defined quantities of a triazine, and to the production and use thereof for producing moulded parts, in particular optical quality sheets and tubes, according to an extrusion method
摘要:
The invention relates to a polymer composition which absorbs infrared radiation (IR), containing a transparent thermoplastic plastic, an inorganic infrared absorber, also referred to as IR absorber hereinbelow, at least one inorganic nano-scale pigment, and the combination of at least two organic colouring agents of a specific structure, and to the preparation and use of the polymer compositions according to the invention and to products produced therefrom.