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US 6,420,442 B1Granted
Flame-proofed polystyrene foamed materials
AssigneeBASF SE
InventorsFranz-Josef Dietzen, Guiscard Glück, Gerd Ehrmann, Gerhard Turznik, Gerhard Alicke, Klaus Hahn, Martin Klatt, Karlheinz Braun
Life of this patent
Estimating the term…
Abstract
Flame-retardant foam slabs are based on styrene polymers wherein from 1 to 12% by weight of expanded graphite and also, if desired, from 1 to 12% by weight of a phosphorus compound are present as flame retardants.
Claims15
An extruded foam slab having a density of from 20 to 200 g/l and having a cross-sectional area of at least 50 cm2, based on styrene polymers, wherein from 1 to 12% by weight, based on the styrene polymers, of expandable graphite, having no surface coating, is present as a flame retardant.
Dependencies are inferred from the claim text.