Reinforced polypropylene pipe

1. A single- or multilayer threaded pipe, wherein at least one layer is produced from a polyolefin composition comprising (percentages based as a sum of components (A) and (B)):

(A) 73 to 87 wt % of a heterophasic polypropylene composition comprising (percentages based on the heterophasic polypropylene composition):

(1) 65-95 wt % of a propylene homopolymer insoluble in xylene at 25° C. in an amount over 85 wt %, comprising a polydispersity index ranging from 4 to 13, and an intrinsic viscosity ([η] 1 ) value of over 2.2 dl/g; and

(2) 5-35 wt % of an olefin polymer of ethylene with propylene or a C 4 -C 10 alpha-olefin comprising an ethylene content ranging from 35 to 60 wt %, and an intrinsic viscosity of a fraction soluble in xylene ([η] 2 ) of at least 1.4 dl/g;

wherein a ratio of the intrinsic viscosity value of the propylene polymer (1) to that of the olefin polymer (2) ([η] 1 /[η] 2 ) ranges from 0.45 to 1.6; and

(B) 13-27 wt % of at least one filler selected among calcium carbonate, talc, wollastonite, or mixtures thereof.

2. The single- or multilayer threaded pipe according to claim 1 , wherein the at least one filler (B) is calcium carbonate.

3. The single- or multilayer threaded pipe according to claim 1 , wherein the single- or multilayer threaded pipe comprises at least one thread profile, and the thread profile is trapezoidal comprising flat crests and roots.

4. The single- or multilayer threaded pipe according to claim 3 , wherein the thread profile comprises angles α and β, wherein the angles α and β are formed by oblique sides of at least one trapezoidal rib.

5. The single- or multilayer threaded pipe according to claim 4 , wherein the single- or multiplayer threaded pipe comprises planes perpendicular to a plane ( 24 ), and the planes perpendicular to the plane ( 24 ) vary independently from 0.1° to 45°.

6. The single- or multilayer threaded pipe according to claim 3 , wherein the angles α and β are equal.

7. The single- or multilayer threaded pipe according to claim 3 , wherein the at least one thread profile conforms to that described DIN norm 103, Part 1.

8. The single- or multilayer threaded pipe according to claim 3 , the at least one thread profile is rectangular.

9. The single- or multilayer threaded pipe according to claim 3 , further comprising a wall residual thickness of a tongue thread profile from 7% to 65%, with respect to a mean wall thickness.

10. The single- or multilayer threaded pipe according to claim 3 , further comprising a residual wall thickness of a groove thread profile from 25% to 70%, with respect to a mean wall thickness.

11. The single- or multilayer threaded pipe according to claim 3 , further comprising at least one crest and root, wherein the at least one crest and root is equal to or greater than 2.0 mm in width.

12. The single- or multilayer threaded pipe according to claim 1 , further comprising a unthreading strength, wherein the unthreading strength is higher than 6200 N.

13. The single- or multilayer threaded pipe according to claim 1 , wherein the pipe is a single-layer pipe.

14. A single-layer threaded pipe, wherein at least one layer is produced from a polyolefin composition comprising (percentages based as a sum of components (A) and (B)):

(A) 73 to 87 wt % of a heterophasic polypropylene composition comprising (percentages based on the heterophasic polypropylene composition):

(1) 65-95 wt % of a propylene homopolymer insoluble in xylene at 25° C. in an amount over 85 wt %, comprising a polydispersity index ranging from 4 to 13, and an intrinsic viscosity ([η] 1 ) value of over 2.2 dl/g; and

(2) 5-35 wt % of an olefin polymer of ethylene with propylene or a C 4 -C 10 alpha-olefin comprising an ethylene content ranging from 35 to 60 to 85 wt %, and an intrinsic viscosity of a fraction soluble in xylene ([η] 2 ) of at least 1.4 dl/g;

wherein a ratio of the intrinsic viscosity value of the propylene polymer (1) to that of the olefin polymer (2) ([η] 1 /[η] 2 ) ranges from 0.45 to 1.6; and

(B) 13-27 wt % of at least one filler selected among calcium carbonate, talc, wollastonite, or mixtures thereof; the single-layer threaded pipe comprising two threaded ends, the single-layer threaded pipe further comprising:

a threaded profile selected from the group consisting of tongue profile and groove profile;

the thread profile comprise a rectangular profile, and conform to DIN norm 103—Part 1;

a nominal outside diameter (d n ) ranging from 110 to 200 mm;

a wall thickness ranging from 7.00 to 11.00 mm;

a residual wall thickness of the tongue profile ranging from 2.00 to 4.50 mm and a residual wall thickness of the groove profile ranging from 2.40 to 5.00 mm;

a thread depth of the threaded profile is of 2.00 mm for threaded pipes comprising 110 mm≦d n ≦140 mm, and of 2.6 mm for threaded pipes comprising 140 mm<d n ≦200 mm; and

projecting ribs of the thread profile are 2.9 mm in width, and grooves are 3.1 mm in width.

15. The pipe of claim 1 wherein the heterophasic polypropylene composition has an MFR of 0.9 to less than 5.0 g/10 min.

16. The pipe of claim 14 wherein the heterophasic polypropylene composition has an MFR of 0.9 to less than 5.0 g/10 min.