Mineral-filled polyamide moulding compounds
AssigneeEms-Chemie AG
InventorPhilipp HARDER
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Abstract
Disclosed is a mineral-filled thermoplastic polyamide moulding compound consisting of at least one polyamide; a mineral filler, glass or carbon fibers, a black colorant, and an additive. The polyamide moulding compound has a colour brightness L* of a maximum of 30 if the gloss is also measured and of a maximum of 12 if the gloss is not also measured. Also disclosed is a method for improving the deep black colour impression of a black-coloured, mineral-filled polyamide moulding compound.
Claims21
1-16. (Canceled)
A thermoplastic polyamide moulding compound consisting of:
- A 20-89.9 wt.-% of at least one polyamide;
- B 10-55 wt.-% of mineral filler, consisting of a mixture of 45 to 70 wt.-% of crypto crystalline silicic acid B1, 5 to 15 wt.-% of amorphous silicic acid B2 and 20 to 40 wt.-% of calcined kaolin B3, in relation to 100 wt.-% of B, respectively, wherein the component B has an aluminium oxide content of 5-20 wt.-%, and a silicon oxide content of 80-95 wt.-%, in relation to 100% of B;
- C 0-15 wt.-% of glass fibers and/or carbon fibers
- D 0.1-5.0 wt.-% of black colorant;
- and
- E 0-5.0 wt.-% of additives;
- wherein the sum of A to E is 100% of the thermoplastic polyamide moulding compound,
- and wherein the thermoplastic polyamide moulding compound has a color brightness L*, determined according to DIN EN ISO 11664-4:2020 in the CIELAB color space on a plate of the dimension 60×60×2 mm, of a maximum of 30 if the gloss is also measured and of a maximum of 12 if the gloss is not also measured.
A method for enhancing a deep black color impression in a black-colored, mineral-filled polyamide moulding compound wherein a color brightness L* of the polyamide moulding compound, determined according to DIN EN ISO 11664-4:2020 in the CIELAB color space on a plate of the dimension 60×60×2 mm, is a maximum of 30 if the gloss is included and is a maximum of 12 if the gloss is excluded, the method comprising including mineral fillers (B) in the polyamide moulding compound, wherein the mineral fillers consist of a mixture of 45 to 70 wt.-% of crypto crystalline silicic acid B1, 5 to 15 wt.-% of amorphous silicic acid B2, and 20 to 40 wt.-% of calcined kaolin B3, in relation to 100 wt.-% of B, respectively, wherein the component B has an aluminium oxide content of 5-20 wt.-% and a silicon oxide content of 80-95 wt.-%, in relation to 100% of B, in a black-colored, mineral-filled polyamide moulding compound.
Dependencies are inferred from the claim text.