Abstract: A method for producing films, fibers, and moldings of a polybenzazole polymer (P) by reacting at temperatures of 0 to 120° C. a mixture including (a) aromatic dicarboxylic compound(s) (I): wherein Ar1 is optionally substituted phenylene, naphthalenediyl, anthracenediyl, biphenyldiyl, diphenylmethanediyl, diphenyl ether diyl, diphenyl thio ether diyl, diphenyl sulfone diyl, benzophenonediyl, pyridinediyl, pyrimidinediyl, furandiyl, or thiophenediyl, substituents being —F, —Cl, —Br, —OR1, and —C1-C10-alkyl, R1 being —H or —C1-C10-alkyl; X1 and X2 are independently-OR2, —F, —Cl, or —Br, R2 being —H, —C1-C10-alkyl, —C1-C10-alkenyl or a repeating unit (a): wherein m is a natural number from 1 to 50, and R3 is —H, C1-C10-alkyl, or C1-C10-alkenyl; (b) aromatic diamino compound(s) of formula (IIa), (IIb), (IIc) and/or (IId); (c) at least one ionic liquid (IL), to obtain a product, processing the product at temperatures 0 to 100° C. and heating of the articles obtained at temperatures of 250 to 500° C.

Abstract: The present invention relates to a method for producing a polybenzazole polymer (P) by reacting a reaction mixture (RG) comprising at least one aromatic dicarboxylic compound of the general formula (I), at least one aromatic diamino compound of the general formula (IIa), (IIb), (IIc) and/or (IId) and also at least one ionic liquid (IL). The present invention also relates to the polybenzazole polymer (P), which is obtainable by the method according to the invention, and also to the use of the polybenzazole polymer (P), for example as fiber material.

Abstract: The invention relates to a process and an apparatus for pelletizing polymer melts comprising blowing agent in a pelletizing chamber through which a liquid flows, its pressure being above the ambient pressure. In a first step, the polymer melt is injected into the pelletizing chamber, in a second step the polymer melt is cut via a cutting apparatus into individual pellets and, in a third step, the pellets produced in the pelletizing process are discharged with the liquid from the pelletizing chamber and are then isolated from the liquid.

Abstract: The invention relates to a module for absorbing energy from an impact to which the module (3) has been subjected, via deformation, comprising a core (5) made of a polymer foam with a density of at most 0.2 g/cm3 and with a compressive modulus of elasticity of at most 200 MPa measured to DIN EN 826, wherein the core (5) has an at least to some extent enclosing shell (7) made of a polymer material, and/or comprises an insert (15) made of a polymer material, where the density of the polymer material of the shell (7) and/or of the insert (15) is at most 2.0 g/cm3 and its tensile modulus of elasticity is at least 700 MPa, measured to DIN EN ISO 527.

Abstract: Expandable styrene polymers (EPS) comprising, in each case based on the styrene polymer, a) from 0.05 to 5% by weight of an organic bromine compound whose bromine content is at least 50% by weight, as flame retardant, b) from 0.05 to 2% by weight of a flame retardant synergist, c) from 0.1 to 5% by weight of a metal salt as acid scavenger, and process for their production.

Abstract: A process for producing polystyrene foam particles having a bulk density in the range from 40 to 400 g/l by extrusion of a polystyrene melt comprising carbon dioxide and/or water as blowing agent through a nozzle and underwater pelletization, wherein the underwater pelletization is carried out at a pressure in the range 1-30 bar.

Abstract: The invention relates to a module for absorbing energy from an impact to which the module (3) has been subjected, via deformation, comprising a core (5) made of a polymer foam with a density of at most 0.2 g/cm3 and with a compressive modulus of elasticity of at most 200 MPa measured to DIN EN 826, wherein the core (5) has an at least to some extent enclosing shell (7) made of a polymer material, and/or comprises an insert (15) made of a polymer material, where the density of the polymer material of the shell (7) and/or of the insert (15) is at most 2.0 g/cm3 and its tensile modulus of elasticity is at least 700 MPa, measured to DIN EN ISO 527.

Abstract: Expandable pelletized styrene polymer materials with at least bi- or multimodal molecular weight distribution, to a process for their preparation, and to use for producing moldable-foam moldings.

Abstract: Expandable styrene polymers (EPS) comprising, in each case based on the styrene polymer, a) from 0.05 to 5% by weight of an organic bromine compound whose bromine content is at least 50% by weight, as flame retardant, b) from 0.05 to 2% by weight of a flame retardant synergist, c) from 0.1 to 5% by weight of a metal salt as acid scavenger, and process for their production.

Abstract: A process for the preparation of expandable styrene polymers having a molecular weight Mw of greater than 170,000 g/mol, which comprises conveying a blowing agent-containing styrene polymer melt having a temperature of at least 120° C. through a die plate with holes whose diameter at the die exit is at most 1.5 mm, and subsequently granulating the extrudate, and expandable styrene polymers (EPS) having a molecular weight Mw of more than 170,000 g/mol with 0.05 to 1.5% by weight of internal water.

Abstract: The invention relates to a process and an apparatus for pelletizing polymer melts comprising blowing agent in a pelletizing chamber through which a liquid flows, its pressure being above the ambient pressure. In a first step, the polymer melt is injected into the pelletizing chamber, in a second step the polymer melt is cut via a cutting apparatus into individual pellets and, in a third step, the pellets produced in the pelletizing process are discharged with the liquid from the pelletizing chamber and are then isolated from the liquid.

Abstract: A process for producing polystyrene foam particles having a bulk density in the range from 40 to 400 g/l by extrusion of a polystyrene melt comprising carbon dioxide and/or water as blowing agent through a nozzle and underwater pelletization, wherein the underwater pelletization is carried out at a pressure in the range 1-30 bar.

Abstract: A process for producing expandable styrene polymers (EPS) having improved expandability, wherein from 0.1 to 1% by weight, based on the styrene polymer, of a free-radical former is metered into a styrene polymer melt containing blowing agent at a melt temperature in the range from 150 to 220° C. and the melt is extruded through a die plate with subsequent underwater pelletization.

Abstract: Expandable pelletized styrene polymer materials with at least bi- or multimodal molecular weight distribution, to a process for their preparation, and to use for producing moldable-foam moldings.

Abstract: The invention relates to a process for producing antistatically treated, expandable styrene polymers, in which a styrene polymer melt is admixed with from 0.05 to 6% by weight of an antistatic and a blowing agent, extruded through a die and pelletized.

Abstract: Expandable styrene polymer granules with halogen-free flame retardancy, comprising a) from 5 to 50% by weight of a filler selected from pulverulent inorganic substances such as talc, chalk, kaolin, aluminum hydroxide, aluminum nitrite, aluminum silicate, barium sulfate, calcium carbonate, titanium dioxide, calcium sulfate, silica, quartz flour, aerosil, alumina or wollastonite, and b) from 2 to 40% by weight of expandable graphite having a mean particle size in the range from 10 to 1000 ?m, c) from 0 to 20% by weight of red phosphorus or an organic or inorganic phosphate, phosphite or phosphonate, d) from 0 to 10% by weight of carbon black or graphite, and processes for their preparation and use for preparing self-extinguishing polystyrene particle foams.

Abstract: Halogen-free, flame-retardant polymer foams, in particular molded polystyrene foams, composed of expandable polystyrene (EPS) or extruded polystyrene foam sheets (XPS), which comprise, as flame retardant, a phosphorus compound of the general formula (I) where R1, R2, and R3, independently of one another, are H, substituted or unsubstituted C1-C15-alkyl, substituted or unsubstituted C1-C15-alkenyl, substituted or unsubstituted C3-C8-cycloalkyl, substituted or unsubstituted C6-C18-aryl, or substituted or unsubstituted C7-C30-alkylaryl, or the hydrolysis product or metal salt of a phosphorus compound of the general formula (I), and processes for their production.

Abstract: A process for producing flame-resistant, expandable styrene polymers (EPS) or flame-resistant extruded styrene polymer foams (XPS), wherein an organic bromine compound having a bromine content of at least 70% by weight is used as flame retardant and a liquid peroxide, hydroperoxide or a peroxide solution is used as flame retardant synergist.

Abstract: Moldable-foam moldings whose density is in the range from 10 to 100 g/l, obtainable via the fusion of prefoamed foam beads composed of expandable, pelletized thermoplastic polymer materials, comprising from 5 to 100% by weight of a styrene copolymer A), from 0 to 95% by weight of polystyrene B), and from 0 to 95% by weight of a thermoplastic polymer C) other than A) and B), and a process for producing the expandable pelletized thermoplastic polymer materials.

Abstract: Moldable-foam moldings whose density is in the range from 8 to 200 g/l, obtainable via fusion of prefoamed foam beads composed of expandable pelletized filled thermoplastic polymer materials, and a process for preparing the expandable pelletized polymer materials.