Brominated flame retardant
AssigneeBASF SE
InventorsKonrad KNOLL, Ingo BELLIN, Jan HOLOCH, Eckhard NEUFELD
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Abstract
Brominated vinylaromatic-diene block copolymers (Br-SBC) comprising a vinylaromatic polymer block S and a brominated diene polymer block BB, wherein before bromination the weight-average molar mass Mw of the block S is greater than or equal to Mw of the block BB, use thereof as flame retardants, and also polymer compositions comprising these for unfoamed and foamed thermoplastic polymers, for example EPS and XPS.
Claims17
A brominated vinylaromatic-diene block copolymer (Br-SBC) comprising at least one vinylaromatic polymer block S, in particular polystyrene block, and at least one brominated diene polymer block BB,
- wherein
- before bromination the weight-average molar mass Mw of the block S is greater than or equal to Mw of the block BB;
- the molar mass Mw of the block BB (before bromination) is from 50 000 to 130 000 g/mol;
- and
- the molar mass Mw of the block S is from 60 000 to 300 000 g/mol;
- wherein the molar mass Mw is determined by means of GPC in accordance with ISO 16014-3:2012 (relative to polystyrene standards at 25° C. in THF) before bromination.
Dependencies are inferred from the claim text.