Tough polyamide moulding material
A moulding material contains to an extent of at least 50 wt % of the combination of the following constituents a) 80 to 97 parts by mass of a polyamide component containing a1) 70 to 100 parts by wt of PA PACMX (wherein X=8 to 18), and a2) 30 to 0 parts by wt of a linear aliphatic polyamide having on average 8 to 12 carbon atoms in the monomer units, wherein the parts by wt sum to 100, and b) 20 to 3 parts by mass of a core-shell modifier which contains the following: b1) a core which contains 60 to 100 wt % of butadiene units and 0 to 40 wt % of styrene units, wherein the core makes up 60 to 95 wt % of the core-shell modifier; and b2) a shell which contains 80 to 100 wt % of methyl methacrylate units and 0 to 20 wt % of modifying monomer units, wherein the shell makes up 5 to 40 wt % of the core-shell modifier, wherein the parts by mass of a) and b) sum to 100.
1. A moulding material, which comprises at least 50 wt % of the combination of the following constituents:
a) 80 to 97 parts by mass of a polyamide component comprising
a1) 70 to 100 parts by wt of PA PACMX (wherein X=8 to 18), and
a2) 30 to 0 parts by wt of a linear aliphatic polyamide having on average 8 to 12 carbon atoms in the monomer units,
wherein the parts by wt sum to 100; and
b) 20 to 3 parts by mass of a core-shell modifier comprising
b1) a core which comprises 60 to 100 wt % of butadiene units and 0 to 40 wt % of styrene units, wherein the core makes up 60 to 95 wt % of the core-shell modifier, and
b2) a shell which comprises 80 to 100 wt % of methyl methacrylate units and 0 to 20 wt % of modifying monomer units, wherein the shell makes up 5 to 40 wt % of the core-shell modifier,
wherein the parts by mass of a) and b) sum to 100, and
wherein the moulding material has a transmission at 550 to 750 nm of at least 85%, measured according to ASTM D1003 using injection moulded tests specimens having a thickness of 2 mm.
2. The moulding material according to claim 1 , wherein the PA PACMX is at least one selected from the group consisting of PA PACM10, PA PACM12 and PA PACM14.
3. The moulding material according to claim 1 , wherein the PA PACMX is a PA PACM12.
4. The moulding material according to claim 1 , wherein the PA PACMX has been produced from a PACM having a content of trans,trans isomer of 30% to 70%.
5. The moulding material according to claim 1 , wherein the PA PACMX is microcrystalline with an enthalpy of fusion, measured in accordance with ISO 11357 at the 2nd heating at a heating and cooling rate of 20° C./min, of 5 to 40 J/g.
6. The moulding material according to claim 1 , wherein the PA PACMX is transparent with a transmission of at least 85% and a haze of less than 3% where both properties are measured according to ASTM D 1003 using injection moulded test specimens having a thickness of 2 mm.
7. The moulding material according to claim 1 , wherein the PA PACMX is a PA PACM12, and
wherein the PA PACM12
a) has been produced from a PACM having a content of trans,trans isomer of 30% to 70%, and
b) is microcrystalline with an enthalpy of fusion, measured in accordance with ISO 11357 at the 2nd heating at a heating and cooling rate of 20° C./min, of 5 to 40 J/g.
8. The moulding material according to claim 1 , wherein the difference in the refractive indices between the polyamide component according to a) and the core-shell modifier according to b) at 20° C. is less than 0.008 measured according to DIN EN ISO 489:1999 by method A.
9. The moulding material according to claim 1 , wherein said material consists of components a) and b) and not more than 50 wt % of further customary added substances.
10. A moulded article produced from the moulding according to claim 1 .
11. The moulded article according to claim 10 , wherein said article is a moulding, a film, a bristle or a fibre.
12. The moulded article according to claim 10 , wherein said article is an eyeglasses frame, another frame or the surface coating of a sports article.
13. The moulding material according to claim 1 , wherein the moulding material has a transmission at 550 to 750 nm of at least 88%, measured according to ASTM D1003 using injection moulded tests specimens having a thickness of 2 mm.
14. The moulding material according to claim 1 , wherein the moulding material has a transmission at 550 to 750 nm of from 90.0 to 91.8%, measured according to ASTM D1003 using injection moulded tests specimens having a thickness of 2 mm.
15. The moulding material according to claim 1 , which comprises at least 50 wt % of the combination of the following constituents:
a) 80 to 95 parts by mass of a polyamide component comprising
a1) 70 to 100 parts by wt of PA PACMX (wherein X=8 to 18), and
a2) 30 to 0 parts by wt of a linear aliphatic polyamide having on average 8 to 12 carbon atoms in the monomer units,
wherein the parts by wt sum to 100; and
b) 20 to 5 parts by mass of a core-shell modifier comprising
b1) a core which comprises 60 to 100 wt % of butadiene units and 0 to 40 wt % of styrene units, wherein the core makes up 60 to 95 wt % of the core-shell modifier, and
b2) a shell which comprises 80 to 100 wt % of methyl methacrylate units and 0 to 20 wt % of modifying monomer units, wherein the shell makes up 5 to 40 wt % of the core-shell modifier.
16. The moulding material according to claim 14 , wherein the PA PACMX is a PA PACM12.
17. The moulding material according to claim 16 , wherein the PA PACM12.
a) has been produced from a PACM having a content of trans,trans isomer of 30% to 70%, and
b) is microcrystalline with an enthalpy of fusion, measured in accordance with ISO 11357 at the 2nd heating at a heating and cooling rate of 20° C./min, of 5 to 40 J/g.
18. The moulding material according to claim 14 , wherein the difference in the refractive indices between the polyamide component according to a) and the core-shell modifier according to b) at 20° C. is less than 0.008 measured according to DIN EN ISO 489:1999 by method A.
19. The moulding material according to claim 1 , wherein the only polyamide is the PA PACMX.
20. The moulding material according to claim 14 , wherein the only polyamide is the PA PACMX.