Extruded polystyrene resin foam board and process for preparing the same
AssigneeJsp Corporation
InventorsMasato Naito, Naochika Kogure, Teruyuki Akiyama, Akira Okuda
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Abstract
The present invention relates to a process for preparing an extruded polystyrene resin foam board having excellent flame retardancy and recyclability, which comprises extruding and foaming a foamable composition, the foamable composition containing a polystyrene resin, a blowing agent and a specific flame retardant including a phosphate ester and a brominated bisphenol ether compound represented by the formula shown in the specification, and to a polystyrene resin foam board having excellent flame retardancy, environmental compatibility and recyclability.
Claims18
A process for preparing an extruded polystyrene resin foam board having an apparent density of 20 to 60 kg/m3 and a thickness of 10 to 150 mm, comprising extruding a foamable composition, which contains at least a polystyrene resin, a flame retardant and a blowing agent and which has been molten and kneaded in an extruder, through a die attached to said extruder,
- wherein said flame retardant comprises a phosphate ester and a brominated bisphenol ether compound represented by the following formula:
- where R represents an alkyl group having 1 to 3 carbon atoms and A represents —C(CH3)2—, —SO2—, —S—, —O—, —CO— or —CH2—, and
- wherein said phosphate ester and said brominated bisphenol ether compound are present in amounts of 0.1 to 6 parts by weight and 0.5 to 5 parts by weight, respectively, per 100 parts by weight of said polystyrene resin.
An extruded polystyrene resin foam board having an apparent density of 20 to 60 kg/m3 and a thickness of 10 to 150 mm and containing 0.10 to 0.90 mol of a saturated hydrocarbon having 3 to 5 carbon atoms per 1 kg of said foam board and a flame retardant comprising a phosphate ester and a brominated bisphenol ether compound represented by the following formula:
- wherein R represents an alkyl group having 1 to 3 carbon atoms and A represents —C(CH3)2—, —SO2—, —S—, —O—, —CO— or —CH2—.
An extruded polystyrene resin foam board having an apparent density of 20 to 60 kg/m3 and a thickness of 10 to 150 mm and containing 0 to 0.80 mol of 1,1,1,2-tetrafluoroethane per 1 kg of said foam board, 0.05 to 0.80 mol of a saturated hydrocarbon having 3 to 5 carbon atoms per 1 kg of said foam board and a flame retardant comprising a phosphate ester and a brominated bisphenol ether compound represented by the following formula:
- wherein R represents an alkyl group having 1 to 3 carbon atoms and A represents —C(CH3)2—, —SO2—, —S—, —O—, —CO— or —CH2—.
Dependencies are inferred from the claim text.