发明名称 |
Expandable polystyrene composition in the form of beads used for production of expanded products such as insulation and packaging, contains styrene polymer, blowing agent and plasticiser |
摘要 |
<p>A polystyrene (PS) composition (I) in the form of expandable beads based on (1) 100 parts by weight (pts. wt.) styrene polymer and (2) 2.2-4.0 pts. wt. blowing agent(s) also contains (3) 0.01-0.4 pt. wt. plasticiser(s). Independent claims are also included for (1) a method (M1) for the production of (I) in one or more stages, one of which involves the (co)polymerisation of styrene in aqueous suspension (2) a method (M2) for the production of medium-density expanded PS objects from (I), by thermal pre-expansion to give beads with an apparent density of 40-190 g/l, followed by stabilisation in air for 6-48 hours at 0-40[deg]C and 50-160 kPa (abs.) and then processing in a heated mould (3) pre-expanded beads with an apparent density of 40-190g/l, containing 100 pts. wt. styrene polymer, 0.5-3.0 pts. wt. blowing agent and 0-0.4 pt. wt. plasticiser (4) a method (M3) for the production of pre-expanded beads with an apparent density of 40-190 (preferably 50-125) g/l by thermal pre-expansion of (I) (5) medium-density expanded PS objects made from (I) or from the above pre-expanded beads by the above methods, with a density of 40-190 (preferably 50-125) g/l .</p> |
申请公布号 |
FR2858977(A1) |
申请公布日期 |
2005.02.25 |
申请号 |
FR20030010073 |
申请日期 |
2003.08.21 |
申请人 |
BP CHEMICALS LIMITED;DEUTSCHE BP |
发明人 |
GALLICE ALEXANDRE;CARLIER CHRISTOPHE;BRES PHILIPPE;WAECKERLE UWE |
分类号 |
C08J9/00;C08J9/14;C08J9/16;C08J9/20;C08J9/22;(IPC1-7):C08J9/16 |
主分类号 |
C08J9/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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