Expandable styrene polymers comprising polymeric brominated flame-retardant
AssigneeBASF SE
InventorsIngo Bellin, Eckhard Neufeld, Jan Holoch
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Abstract
Expandable styrene polymers comprising polymeric brominated flame-retardant, wherein the polymeric brominated flame-retardant comprises at least one brominated polybutadiene block having a bromination degree between 33 and 75%, based on the double bonds in the polybutadiene block before bromination, a process for producing such expandable styrene polymers by suspension polymerization and particulate foam moldings made therefrom.
Claims14
An expandable styrene polymer comprising a polymeric brominated flame-retardant, wherein the polymeric brominated flame-retardant comprises 50 to 85 wt.-% of brominated polybutadiene blocks and the weight average molecular weight Mw of the polymeric brominated flame-retardant is in the range from 80.000 to 180.000 g/mol, determined by Gel Permeation Chromatography according to ISO 16014-3:2012 before bromination and the polymeric brominated flame-retardant has a total bromine content in the range from 50 to 55 wt.-%, determined by elemental analysis, and comprises at least one brominated polybutadiene block having a bromination degree, determined by 1H-NMR spectroscopy, between 59 and 75%, based on the double bonds in the polybutadiene block before bromination, wherein a styrene polymer foam prepared from the expandable styrene polymer has an average cell size is in the range from 120 to 250 μm and a thermal conductivity of from 30.6 to 34.6 mW/(m*K).
Dependencies are inferred from the claim text.