Polymer compositions
Polymer compositions, such as polyamide-based compositions, include melamine cyanurate, nepheline syenite, and glass fibres.
1. A composition comprising:
100 parts by weight of polyamide 6,
20 to 30 parts by weight of nepheline syenite,
6 to 9 parts by weight of long glass fibres, and
5 to 15 parts by weight of melamine cyanurate.
2. The composition according to claim 1 , wherein:
the polymer comprises
the nepheline syenite has a d95 of about 1 to about 150 μm and a d50 of about 1 to about 35 μm;
the long glass fibres having a starting length of 1 to 50 mm, and a fibre diameter of about 7 to about 18 μm; and
the melamine cyanurate particles having mean particle diameter of about 0.1 μm to about 100 μm.
3. The composition according to claim 1 , wherein the polyamide has a viscosity number of about 80 to about 180 ml/g, as determined in accordance with ISO 307, in a 0.5% by weight solution in 96% by weight sulphuric acid at 25° C.
4. The composition according to claim 1 , wherein:
the nepheline syenite has a particle size d95 of 10 to 100 μm and a d50 of about 2 to about 20 μm, determined by laser diffractometry according to standard ISO 13320; and
the melamine cyanurate has mean particle diameter of about 0.1 μm to about 30 μm.
5. The composition according to claim 1 , wherein:
the nepheline syenite has a d95 of about 12 to about 70 μm, and a mean particle size (d50) of 2.5 to 15 μm, determined by laser diffractometry according to standard ISO 13320; and
the melamine cyanurate has mean particle diameter of about 0.1 μm to about 7 μm.
6. The composition according to claim 1 , wherein the nepheline syenite is of particulate, non-cylindrical form having a length-to-thickness ratio of less than 5.
7. The composition according to claim 1 , wherein the glass fibers are long glass fibres having a starting length of about 2 to about 7 mm, and a fibre diameter of about 9 to about 15 μm.
8. The composition according to claim 1 , wherein
the nepheline syenite has a particle size d95 of 10 to 100 μm and a d50 of about 2 to about 20 μm, determined by laser diffractometry according to standard ISO 13320;
the long glass fibers have a starting length of about 2 to about 7 mm, and a fibre diameter of about 9 to about 15 μm; and
the melamine cyanurate has a mean particle diameter of about 0.1 μm to about 30 μm.
9. The composition according to claim 1 , further comprising titanium dioxide.
10. The compositions according to claim 1 , further comprising at least one lubricant and/or demoulding agent.
11. The composition according to claim 1 , further comprising at least one laser absorber selected from the group antimony trioxide, tin oxide, tin orthophosphate, barium titanate, aluminium oxide, copper hydroxyphosphate, copper orthophosphate, potassium copper diphosphate, copper hydroxide, antimony tin oxide, bismuth trioxide and anthraquinone.
12. The composition according to claim 1 , further comprising at least one further flame retardant other than melamine cyanurate.
13. The composition according to claim 10 , wherein the at least one further flame retardant comprises a halogen-free and/or phosphorus-free flame retardant.
14. The composition according to claim 1 , further comprising at least one filler other than nepheline syenite and melamine cyanurate.
15. The composition according to claim 1 , wherein:
the nepheline syenite has a d95 of about 15 to about 35 μm, and a mean particle size (d50) of about 3 to about 10 μm, determined by laser diffractometry according to standard ISO 13320;
the glass fibres are long glass fibres having a starting length of about 2 to about 7 mm, and a fibre diameter of about 9 to about 15 μm; and
the melamine cyanurate has a mean particle size of about 0.1 to about 7 μm.
16. The composition according to claim 15 , further comprising 2 or more of the following components:
titanium dioxide;
at least one lubricant;
at least one demoulding agent;
at least one laser absorber;
at least one further flame retardant other than melamine cyanurate; and
at least one additional filler other than nepheline syenite and melamine cyanurate.
17. The composition according to claim 1 , wherein:
the glass fibres are E-glass fibres having a mean fibre diameter of 10 μm to 12 μm and/or a mean fibre length of 4 to 5 mm, and
the composition further comprises:
ethylene-bis-stearylamide as an additional flame retardant; and
3,3′-bis(3,5-di-tert-butyl-4-hydroxyphenyl)-N,N′-hexamethylenedipropionamide as an antioxidant.
18. A moulding comprising the composition according to claim 1 .
19. A method for producing products, the method comprising:
mixing the components of the composition according to claim 1 in at least one mixer to produce a moulding composition;
feeding the mixture, in the form of the moulding composition, through at least one mixer outlet and at least one of:
processing the mixture further; and
forming the mixture into a strand and cutting the strand into granules of a desired length by means of a granulator, and
shaping the moulding composition or granules in a shaping process.
20. The method of claim 19 wherein:
the nepheline syenite has a mean particle size (d50) of 1 μm to 35 μm, determined by laser diffractometry according to standard ISO 13320; and
the glass fibers are long glass fibres having a starting length of 1 to 50 mm; and
the melamine cyanurate has a mean particle size of 0.1 μm to 100 μm.