Abstract:
Eine thermoplastische Formmasse, enthaltend die Komponenten A, B, C und D, in den Mengen: a) 3 bis 91,9Gew.-% eines oder mehrerer Styrolcopolymere A, b) 3 bis 91 Gew.-% eines oder mehrerer Polyamide B, c) 5 bis 50 Gew.-% eines oder mehrerer Pfropfpolymerisats C d) 0,1 bis 25 Gew.-% eines Terpolymeren D mit einem Oligomerenanteil von kleiner als 3 Gew.-%, sowie gegebenenfalls als weitere Komponenten einen weiteren KautschukE, ein min- destens monofunktionelles Anhydrid F, faser-oder teilchenförmige Füllstoffe G sowie weitere Zusatzstoffe H, weist eine deutlich verminderte Anisotropie der Schlagzähigkeit auf.
Abstract:
Die vorliegende Erfindung betrifft Verfahren zur Herstellung von Copolymeren A) mit verringertem Schmutzpartikelgehalt, enthaltend 49,2 bis 93,2 Gew.-% sich von einem oder mehreren vinylaromatischen Monomeren (Komponente A1 )) ableitende Struktureinheiten, 6 bis 50 Gew.-% sich von einem oder mehreren Vinylcyaniden (Komponente A2)) ableitende Struktureinheiten, 0,8 bis 7 Gew.-% sich von einem oder mehreren Dicarbonsäureanhydriden (Komponente A3)) ableitende Struktureinheiten und 0 bis 25 Gew.-% sich von weiteren copolymerisierbaren Monomeren (Komponente A4)) ableitende Struktureinheiten, wobei die Gew.-% jeweils auf das Gesamtgewicht der sich von den Komponenten A1), A2), A3) und A4) ableitenden Struktureinheiten bezogen sind und zusammen 100 Gew.-% ergeben, durch Masse- oder Lösungspolymerisation, wobei erfindungswesentlich ist, dass das mathematische Produkt aus den Gew.-% der sich von Komponente A2) und den Gew.-% der sich von Komponente A3) ableitenden Struktureinheiten des Copolymers A) im Bereich von 40 Gew.-%2 bis 65 Gew.-%2 liegt. Weiterhin betrifft die vorliegende Erfindung die Copolymere A), thermoplastische Formmassen enthaltend die Copolymere A), die Verwendung der Copolymere A) und der thermoplastischen Formmassen sowie die aus den Copolymeren A) und den thermoplastischen Formmassen erhältlichen Formkörper, Folien, Fasern und Schäume.
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zur Messung der Farbeigenschaften eines Granulats in einem bewegten Granulatstrom, umfassend die folgenden Schritte: (A) Erzeugen einer stationären oder sich bewegenden Granulatschicht aus wenigstens einem Teil des bewegten Granulatstroms mit einheitlicher Schichtdicke, (B) Messung der Farbeigenschaften an der in Schritt (A) erzeugten Granulatschicht und (C) gegebenenfalls Rückführen des Teils des Granulatstroms, aus dem die Granulat schicht in Schritt (A) erzeugt worden ist, in den Granulatstrom und gegebenenfalls Fortsetzen der Bewegung des Granulatstroms, sowie eine Vorrichtung zur Durchführung des Verfahrens.
Abstract:
The invention relates to molding compounds which comprise 10 to 100 % by weight of a composition (I) which is constituted of A) 40 to 95 % by weight, based on the weight of composition (I), of a copolymer comprising 55 to 90 % by weight, based on the weight of component A, of a-methylstyrene, 10 to 50 % by weight, based on the weight of component A, of acrylonitrile, and 0 to 5 % by weight, based on the weight of component A, of other monomers, as component A; B) 2.5 to 75 % by weight, based on the weight of composition (I), of a polymer B, constituted of 60 to 90 % by weight, based on the weight of component B, of a vinyl-aromatic monomer, 8.01 to 39.8 % by weight, based on the weight of component B, of acrylonitrile, and 0.2 to 1.99 % by weight, based on the weight of component B, of maleic acid anhydride, as component B; and C) 2.5 to 60 % by weight, based on the weight of composition (I), of glass fibers as component C, whereby the sum of components A, B and C adds up to 100 % by weight. The invention also relates to methods for producing the inventive molding compounds, and to the use of the compounds for producing a molded article.
Abstract:
The invention relates to a tube bundle heat exchanger (R) for removing dissolved substances from a polymer solution (P) by degassing, having a bundle of tubes (R) which are arranged parallel to one another and vertically and are fastened at both ends in each case in one tube plate (B), and having a degassing region below the lower tube plate (B), having an insert (1) in each tube (R), which insert (1) narrows the free throughflow cross section through the tube (R), and wherein the polymer solution (P) is supplied into the tubes (R) in a single-phase liquid state, and having a casing space around the tubes (R) which is traversed by a heat carrier, wherein the degassing takes place by means of a pressure drop between the inlet pressure of the polymer solution (P) in the tube bundle heat exchanger (R) and the degassing region, characterized in that each insert (1) is designed in such a way as to generate a pressure step between the inlet pressure and the pressure in the degassing region, by means of which pressure step a predefined low residual content of dissolved substances is obtained in the degassed polymer, and an additional heat input which is necessary for this purpose takes place via the heat carrier into the single-phase liquid polymer solution (P).
Abstract:
The invention relates to a thermoplastic molding compound, comprising the components A, B, C and D in the following quantities: a) 3 to 91.9% by weight of one or more styrene copolymers A, b) 3 to 91.9% by weight of one or more polyamides B, c) 5 to 50% by weight of one or more graft polymers C, d) 0.1 to 25% by weight of a terpolymer D having an oligomer percentage of less than 3% by weight, and optionally as additional components another rubber, an at least monofunctional anhydride F, fiber or particle-shaped fillers G, and additional additives H, wherein the molding compound exhibits considerably reduced anisotropy regarding impact resistance.
Abstract:
The invention relates to molding compounds which comprise 10 to 100 % by weight of a composition (I) which is constituted of A) 40 to 95 % by weight, based on the weight of composition (I), of a copolymer comprising 55 to 90 % by weight, based on the weight of component A, of a-methylstyrene, 10 to 50 % by weight, based on the weight of component A, of acrylonitrile, and 0 to 5 % by weight, based on the weight of component A, of other monomers, as component A; B) 2.5 to 75 % by weight, based on the weight of composition (I), of a polymer B, constituted of 60 to 90 % by weight, based on the weight of component B, of a vinyl-aromatic monomer, 8.01 to 39.8 % by weight, based on the weight of component B, of acrylonitrile, and 0.2 to 1.99 % by weight, based on the weight of component B, of maleic acid anhydride, as component B; and C) 2.5 to 60 % by weight, based on the weight of composition (I), of glass fibers as component C, whereby the sum of components A, B and C adds up to 100 % by weight. The invention also relates to methods for producing the inventive molding compounds, and to the use of the compounds for producing a molded article.
Abstract:
The present invention relates to a method for producing copolymers A) having a reduced dirt particle content, containing 49.2 to 93.2% by weight of structural units derived from one or more vinyl aromatic monomers (component A1)), 6 to 50% by weight of structural units derived from one or more vinyl cyanides (component A2)), 0.8 to 7% by weight of structural units derived from one or more dicarboxylic acid anhydrides (component A3)), and 0 to 25% by weight of structural units derived from further copolymerizable monomers (component A4)), wherein each weight percent is based on the total weight of the structural units derived from components A1), A2), A3), and A4) and together are 100% by weight, by means of mass or solution polymerization, wherein it is essential to the invention that the mathematical product of the weight percent of the structural units of the copolymer A) derived from the component A2) and of the weight percent of the structural units of the copolymer A) derived from the component A3) ranges between 40% by weight and 65% by weight. The present invention further relates to the copolymers A), to thermoplastic molding compounds containing the copolymer A), to the use of the copolymers A) and of the thermoplastic molding compounds, and to the molded bodies, films, fibers, and foams that can be obtained from the copolymers A) and the thermoplastic molding compounds.
Abstract:
Thermoplastic moulding materials containing the following ingredients with regard to components A-F: A) 5-70 wt. % of at least one graft copolymer A) consisting of a rubber elastic base with a glass transition temperature below 0° and a grafted overlay made of a styrene compound and acrylonitrile or methacrylonitrile or mixtures thereof in addition to, optionally, other monoethylenically unsaturated monomers, B) 29 - 90 wt. % of a hard copolymer made of at least one styrene compound, acrylonitrile or methacrylonitrile or mixtures thereof and, optionally, other monoethylenically unsaturated monomers, C) 0 - 5 wt. % of at least one three-block copolymer X-Y-X with a middle block Y made of propylenoxide units and terminal blocks X made of ethylenoxide units, D) 0.01 - 5 wt. % of at least one butylated reaction product of cresol with dicyclopentadiene, E) 0.01 -5 wt. % of at least one thiocarboxylic acid ester, F) 0.01 -5 wt. % of at least one alkaline metal salt or alkaline earth metal salt of a C6-C20carboxylic acid, G) 0 -30 wt. %, in relation to constituents A) - G), of other usual additives. The moulding materials exhibit a db*-value, after exposure to the atmosphere, of less than +5,0 after 100 hours of exposure to light and the atmosphere according to ISO 4892/2, method A, black panel temperature 65 °C, colour measurement according to CIE-Lab in accordance with DIN 6174 and DIN 5033.
Abstract:
The present invention relates to thermoplastic plastic moulding compositions, comprising a mixture composed of (A) from 30 to 69% by weight, based on the entirety of components (A), (B) and (C), of a methyl methacrylate polymer, (B) from 30 to 69% by weight, based on the entirety of components (A), (B) and (C), of a copolymer, obtainable via polymerization of a vinylaromatic monomer and of a vinyl cyanide, and (C) from 1 to 40% by weight, based on the entirety of components (A), (B) and (C), of a graft copolymer, obtainable from (C1) from 60 to 90% by weight, based on (C), of an agglomerated core based on a 1,3-diene, (C2) from 5 to 20% by weight, based on (C), of a first graft shell composed of a vinylaromatic monomer, of an alkyl methacrylate, and, if appropriate, of a crosslinking monomer, and (C3) from 5 to 20% by weight, based on (C), of a second graft shell composed of an alkyl (meth)acrylate polymer, with the proviso that the quantitative ratio of (C2) to (C3) is in the range from 2:1 to 1:2, and it is inventively significant here that the core (C1) has a monomodal particle size distribution, the average particle size D50 of the core (C1) (determined by the method mentioned in the description) is in the range from 300 to 400 nm, and the difference between the refractive index (nD-C) of the entire component (C) and the refractive index (nD-AB) of the entire matrix of components (A) and (B) is in the range from 0.003 to 0.008, each of the refractive indices being measured by the methods mentioned in the description, and also to processes for preparation of these moulding compositions, to their use, and to the mouldings obtainable therefrom.