Flame-Retardant Composition Comprising 0.040% to 0.095% by Weight of a Flame Retardant
AssigneeCovestro Deutschland AG
InventorsHelmut Werner Heuer, Michael Erkelenz, Christian Kaiser
Life of this patent
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Abstract
The present invention relates to compositions containing linear polycarbonate, branched polycarbonate, a reinforcing fibre and a small amount of salts of sulfonic acid, sulfonamide or sulfonimide derivatives. The invention likewise relates to the use of branched polycarbonate in a polycarbonate composition for achieving a classification according to UL94 of V-0 at a layer thickness of 2.00 mm.
Claims15
A composition containing
- (A) 3% to 82% by weight of a linear polycarbonate,
- (B) 15% to 96% by weight of a polycarbonate having a degree of branching of 0.8 to 1.5 mol % and not comprising any end groups of formula (I):
- in which each Y independently is a halogen, an alkyl group having 1 to 3 carbon atoms, an alkoxy group having 1 to 3 carbon atoms, an arylalkyl group having 7 to 12 carbon atoms, an alkylaryl group or a nitro group,
- y is 0 to 4 and c is 1 to 5, with the proviso that y+c is 1 to 5, and in which * represents the position at which formula (I) terminates the polycarbonate (B),
- (C) 0.040% to 0.095% by weight of a compound selected from the group of alkali metal, alkaline earth metal or ammonium salts of aliphatic or aromatic sulfonic acid, sulfonamide or sulfonimide derivatives and combinations thereof, and
- (D) 1% to 40% by weight of a reinforcing fibre,
- where the % by weight are based on the sum total of components (A) to (D).
A method for achieving a V-0 classification according to UL94 at 2.00 mm layer thickness comprising providing a composition comprising 15% to 96% by weight of a polycarbonate (B) having a degree of branching of 0.8 to 1.5 mol % and not comprising any end groups of formula (I):
- in which each Y independently is a halogen, an alkyl group having 1 to 3 carbon atoms, an alkoxy group having 1 to 3 carbon atoms, an arylalkyl group having 7 to 12 carbon atoms, an alkylaryl group or a nitro group,
- y is 0 to 4 and c is 1 to 5, with the proviso that y+c is 1 to 5, and in which * represents the position at which formula (I) terminates the polycarbonate (B),
- the composition containing
- (A) linear polycarbonate,
- (C) an alkali metal, alkaline earth metal or ammonium salt of aliphatic or aromatic sulfonic acid, sulfonamide or sulfonimide derivatives or combinations thereof and
- (D) a reinforcing fibre,
- wherein a content of component (C) in the composition is 0.05% to 0.095% by weight and where the % by weight are based on the sum total of components (A) to (D).
Dependencies are inferred from the claim text.