Polyamide compositions
Flame resistant compositions based on nylon-6 (PA 6) or nylon-6,6 (PA 66) may include melamine cyanurate, titanium dioxide, glass fibers, and non-fibrous and non-foamed ground glass having a specific particle size distribution, geometry and optionally sizing. Methods for producing the composition are also provided, as well as use of the compositions for production of products for the electrical industry, preferably electrical components such as residual current circuit breakers and other circuit breakers.
1. A composition comprising:
A) 5% to 92.8% by weight of nylon-6 or nylon-6,6,
B) 5% to 80% by weight of non-fibrous and non-foamed ground glass having a d90 of 5 μm to 250 μm,
C) 2% to 8% by weight of glass fibres,
D) 0.1% to 40% by weight of melamine cyanurate, and
E) 0.1% to 10% by weight of titanium dioxide,
with the proviso that the sum total of all the percentages by weight is always 100%.
2. The composition according to claim 1 ,
wherein component B) is optionally sized with at least one aminoalkyltrialkoxysilane, in amounts of 0.01% by weight to 1.5% by weight, based on the amount of the non-fibrous and non-foamed ground glass.
3. The composition according to claim 1 , wherein the non-fibrous and non-foamed ground glass has a particulate, non-cylindrical form with a width to thickness ratio of less than 5.
4. The composition according to claim 3 , wherein the non-fibrous and non-foamed ground glass has a density of 2400 kg/m 3 to 2700 kg/m 3 .
5. The composition according to claim 4 , wherein the non-foamed and non-fibrous ground glass does not exhibit the glass geometry typical of fibrous glass with a cylindrical or oval cross section having a length to diameter ratio (L/D ratio) of greater than 5.
6. The composition according to claim 5 , wherein the non-fibrous and non-foamed ground glass comprises at least one of soda-lime glass, borosilicate glass, A Glass or E Glass.
7. The composition according to claim 6 , wherein the non-fibrous and non-foamed ground glass comprises glass types in which the K 2 O content is less than or equal to 2% by weight, based on all the components of the glass.
8. The composition according to claim 3 , wherein the width to thickness ratio is less than 2.
9. The composition according to claim 6 , wherein the non-fibrous and non-foamed ground glass comprises E glass.
10. A composition comprising:
A) 30% to 80% by weight, of nylon-6,
B) 15% to 50% by weight, of a non-fibrous and non-foamed glass having a d90 determined by laser diffractometry in the range from 16 to 25 μm,
C) 4% to 6% by weight, of glass fibres,
D) 1% to 20% by weight, of melamine cyanurate,
E) 1% to 2% by weight, of titanium dioxide, and
H) 5% to 25% by weight, of ethylenebisstearylamide,
with the proviso that the sum total of all the percentages by weight is always 100%.