Abstract:
Disclosed are expandable styrene polymers (EPS) containing, in relation to the styrene polymer, a) 0.05 to 5 percent by weight of an organic bromine compound containing a minimum of 50 percent by weight of bromine as a flameproofing agent, b) 0.05 to 2 percent by weight of a flameproofing synergist, c) 1 to 5 percent by weight of a metallic salt as an acid collector. Also disclosed is a method for producing said expandable styrene polymers.
Abstract:
The invention relates to a method for producing expandable thermoplastic polymer particles by post-impregnating thermoplastic polymer particles that contain at least one styrene polymer and at least one polyolefin, using a blowing agent. Said post-impregnation is predominantly carried out in the gas phase.
Abstract:
The invention relates to a method and a device for granulating polymer melts containing blowing agent in a granular heating chamber, through which there flows a liquid at a pressure above ambient pressure. In a first step, the polymer melt is forced into the granulating chamber, in a second step the polymer melt is cut by a cutting device into individual granular grains and in a third step the granular grains produced in the granulation are discharged with the liquid from the granulating chamber and separated from the liquid. The method additionally comprises at least one of the following steps: (a) comminuting agglomerates or granular grains that exceed a predetermined maximum size, in a comminuting machine arranged downstream of the granulating chamber or in a comminuting unit arranged downstream of the cutting device, (b) allowing the liquid to expand in an expansion machine, (c) allowing the liquid to expand in a throttle device, a pressure equalizing tank being arranged upstream of the throttle device, (d) separating the granular grains from the liquid without previously allowing the liquid to expand with the granular grains contained in it.
Abstract:
The invention relates to expanded particulate moulded parts with a density ranging between 10 and 100 g/l. Said parts are obtained by welding pre-expanded particulate consisting of expandable thermoplastic polymer granulates, the latter containing between 5 and 100 wt. % styrene copolymer A), between 0 and 95 wt. % polystyrene B) and between 0 and 95 wt. % thermoplastic polymer C) that differs from a) and b). The invention also relates to methods for producing the expandable thermoplastic polymer granulates.
Abstract:
The invention relates to expandable polystyrene granulates with at least a bi- or multi-modal molecular-weight distribution, to a method for producing said granulates and to their use in the production of expanded particulate moulded parts.
Abstract:
The invention relates to a particle foam which contains 0.5 to 8 wt.-% of one or more corrosion inhibitors, selected from among amines, triazoles, carboxylic acid esters, carboxylic acid salts, nitrites, alcohols or mixtures thereof, to methods for producing said foam and to the use for packaging corrodible metal articles.
Abstract:
Disclosed are expandable styrol polymer granulates that are rendered flame-proof without using halogen and contain: a) 5 to 50 wt. % of a filler selected among powdered inorganic materials such as talc, chalk, kaolin, aluminum hydroxide, aluminum nitrite, aluminum silicate, barium sulfate, calcium carbonate, titanium dioxide, calcium sulfate, silicic acid, silica flour, aerosil, alumina, or wollastonite; b) 2 to 40 wt. % of expanded granite which has an average particle size ranging from 10 to 1000 µm, c) 0 to 20 wt. % of red phosphorus or an organic or inorganic phosphate, phosphite, or phosphonate; d) 0 to 10 wt. % of black or graphite. Also disclosed are methods for the production of said styrol polymer granulates and the use thereof for producing self-extinguishing expanded polystyrol particles.
Abstract:
The invention relates to a method and a device for granulating polymer melts containing blowing agent in a granular heating chamber, through which there flows a liquid at a pressure above ambient pressure. In a first step, the polymer melt is forced into the granulating chamber, in a second step the polymer melt is cut by a cutting device into individual granular grains and in a third step the granular grains produced in the granulation are discharged with the liquid from the granulating chamber and separated from the liquid. The method additionally comprises at least one of the following steps: (a) comminuting agglomerates or granular grains that exceed a predetermined maximum size, in a comminuting machine arranged downstream of the granulating chamber or in a comminuting unit arranged downstream of the cutting device, (b) allowing the liquid to expand in an expansion machine, (c) allowing the liquid to expand in a throttle device, a pressure equalizing tank being arranged upstream of the throttle device, (d) separating the granular grains from the liquid without previously allowing the liquid to expand with the granular grains contained in it.
Abstract:
A method for the production of coated, expandable, styrene polymer (EPS) granules by extrusion of a styrene polymer melt containing an expanding agent through a nozzle plate with subsequent underwater granulation, wherein the EPS granules are coated by coating agents that are soluble, emulsifiable or suspendable in water in the water circuit of the underwater granulator.