Transparent moulding compound

1. A single layer or multi-layer film comprising a first composition which comprises at least 95% by weight of a copolyamide having a melt viscosity of from 250 to 10,000 Pas, which is obtained by polymerizing a monomer composition consisting essentially of:

a) from 65 to 99 mol % of a substantially equimolar mixture comprising

an unbranched aliphatic diamine having from 6 to 18 carbon atoms and

an unbranched aliphatic dicarboxylic acid having from 6 to 18 carbon atoms,

where said mixture

comprises an average of from 8 to 12 carbon atoms per monomer,

and

b) from 1 to 35 mol % of a substantially equimolar mixture comprising

a cycloaliphatic diamine having from 8 to 20 carbon atoms and of a non-aromatic dicarboxylic acid having from 6 to 18 carbon atoms, wherein all of the dicarboxylic acids in (b) are non-aromatic.

2. The film as claimed in claim 1 , wherein, the copolyamide has a crystallite melting point T m in the range from 180 to 220° C.

3. The film as claimed in claim 1 , wherein, the enthalpy of fusion of the copolyamide is at least 30 J/g.

4. The film as claimed in claim 1 , wherein, said a) is selected from the group consisting of hexamethylenediamine/sebacic acid and hexamethylenediamine/1,12-dodecanedioic acid.

5. A printable or printed item which comprises the film as claimed in claim 1 .

6. The item as claimed in claim 5 , wherein the film is a single-layer film.

7. The film as claimed in claim 1 , having a thickness of from 0.02 to 1 mm.

8. The film as claimed in claim 1 , which comprises one or more further underlayers, selected from the group of polyamide elastomer, polyamide, copolyamide, and adhesion promoter.

9. The film as claimed in claim 8 , wherein one of the underlayers has been transparently or opaquely colored.

10. The film as claimed in claim 1 , which is a topcoat for skis or snowboards.

11. The film according to claim 1 , wherein said copolyamide exhibits a relative solution viscosity, measured on a 0.5% strength by weight solution in m-cresol at 23° C. to ISO 307, of about 1.5 to about 2.5.

12. The film as claimed in claim 1 ,

wherein, the copolyamide has a crystallite melting point T m in the range from 185 to 210° C.

13. The film as claimed in claim 1 ,

wherein, the copolyamide has a crystallite melting point T m in the range from 190 to 200° C.

14. The film according to claim 1 , wherein said copolyamide having a melt viscosity of from 250 to 10,000 Pas is obtained by polymerizing a monomer composition consisting essentially of:

(a) from 85 to 96 mol % of a substantially equimolar mixture comprising

an unbranched aliphatic diamine having from 6 to 8 carbon atoms and

an unbranched aliphatic dicarboxylic acid having from 6 to 18 carbon atoms,

where said mixture comprises an average of from 8 to 12 carbon atoms per monomer,

and

b) from 4 to 15 mol % of a substantially equimolar mixture comprising

a cycloaliphatic diamine having from 8 to 20 carbon atoms and a non-aromatic dicarboxylic acid having from 6 to 18 carbon atoms, wherein all of the dicarboxylic acids in (b) are non-aromatic.

15. The film as claimed in claim 1 , wherein, the enthalpy of fusion of the copolyamide is at least 55 J/g.

16. The film as claimed in claim 1 , wherein the mixture has an average carbon number of from 9 to 11 atoms per monomer.

17. The film as claimed in claim 1 , wherein the copolyamide has a number average molecular weight of from 200 to 2,000.

18. The film as claimed in claim 14 , wherein the mixture has an average carbon number of from 9 to 11 carbon atoms per monomer.

19. The film as claimed in claim 14 , wherein the copolyamide has a number average molecular weight of from 200 to 2,000.

20. A single layer or multi-layer film comprising a transparent layer consisting essentially of copolyamide having a viscosity of from 250 to 10,000 Pa·s, wherein the copolyamide contains only aliphatic monomers and is obtained by polymerzing a monomer mixture comprising:

a) from 65 to 99 mol % of a substantially equimolar mixture comprising

an unbranched aliphatic diamine having from 6 to 8 carbon atoms and

an unbranched aliphatic dicarboxylic acid having from 6 to 18 carbon atoms,

where said mixture

comprises an average of from 8 to 12 carbon atoms per monomer,

and

b) from 1 to 35 mol % of a substantially equimolar mixture comprising

a cycloaliphatic diamine having from 8 to 20 carbon atoms and a non-aromatic dicarboxylic acid having from 6 to 18 carbon atoms, wherein all of the dicarboxylic acids in (b) are non-aromatic.

21. The film as claimed in claim 20 , wherein, the copolyamide has a crystallite melting point T m in the range from 180 to 220° C.

22. The film as claimed in claim 20 , wherein, the enthalpy of fusion of the copolyamide is at least 30 J/g.

23. The film as claimed in claim 20 . wherein, said a) is selected from the group consisting of hexamethylenediamine/sebacic acid and hexamethylenediamine/1,12-dodecanedioic acid.

24. A printable or printed item which comprises the film as claimed in claim 20 .

25. The item as claimed in claim 20 , wherein the film is a single-layer film.

26. The film as claimed in claim 20 , having a thickness of from 0.02 to 1 mm.

27. The film as claimed in claim 1 , wherein the first composition consists of the copolyamide and the copolyamide consists of a mixture of polymerized monomers (a) and (b).

28. The film as claimed in claim 1 , wherein the film is transparent.

29. The film as claimed in claim 1 , wherein the copolyamide is obtained by polymerizing a monomer composition that consists of (a) and (b).