Halogen free flame-retardant thermoplastic moulding compositions based on polyamide with increased glow-wire resistance
The present invention relates to thermoplastic moulding compositions comprising unbranched, thermoplastic polyamide, a phosphinic or diphosphinic salt, a nitrogen-containing flame retardant combination and also at least one oxygen-containing, nitrogen-containing or sulphur-containing metal compound and also to the production and the use of the inventive moulding compositions for production of fibres, of foils and of mouldings of any type.
1. A molding composition comprising:
A) from 20 to 97% by weight of an unbranched aliphatic thermoplastic polyamide,
B) from 1 to 30% by weight, based on the entire composition, of at least one phosphinic acid salt of the formula (I)
wherein
R 1 and R 2 are ethyl,
M is aluminum,
M is from 1 to 4,
C) from 1 to 40% by weight of a nitrogen-containing flame retardant combination of
C1) from 2 to 3% by weight, based on 100% by weight of the entire composition, of melamine cyanurate and
C2) about 5% by weight, based on 100% by weight of the entire composition, of melamine polyphosphate,
D) from 1 to 3% by weight, based on the entire composition, of zinc borate.
2. A molding composition comprising:
A) from 20 to 97% by weight of an unbranched aliphatic thermoplastic polyamide,
B) from 1 to 30% by weight, based on the entire composition, of at least one phosphinic acid salt of the formula (I)
wherein
R 1 and R 2 are ethyl,
M is aluminum,
M is from 1 to 4,
C) from 1 to 40% by weight of a nitrogen-containing flame retardant combination of
C1) from 0.1 to 25% by weight, based on 100% by weight of the entire composition, of melamine cyanurate and
C2) at least 0.1 to 25% by weight, based on 100% by weight of the entire composition, of melamine polyphosphate,
wherein the ratio of the melamine cyanurate C1) to the melamine polyphosphate C2) is from 2:5 to 3:5, and
D) from 0.1 to 10% by weight, based on the entire composition, of zinc borate.
3. The molding composition according to either claim 1 or claim 2 , further comprising:
F) from 0.1 to 60% by weight of one or more fillers and reinforcing materials.
4. The molding composition according to either claim 1 or claim 2 , further comprising:
G) 0.01 to 40% by weight, based on the entire composition, of other additives.
5. A process for producing fibers, foils or moldings, comprising:
forming said fibers, foils or moldings from the molding composition according to either claim 1 or claim 2 .
6. Fibers, foils and moldings obtainable via the process according to either claim 1 or claim 2 .
7. A process for production of halogen-free flame-retardant foils, fibers or moldings, comprising:
forming said halogen-free flame-retardant fibers, foils or moldings from the molding composition according to either claim 1 or claim 2 .