Coating composition
View Patent ↗Coating composition comprising an ethylene copolymer containing not more than 5 mole-% comonomer, whereby the fraction of the ethylene copolymer having a molecular weight of 300 000 g/mol-600 000 g/mol has a methyl branching of more than 4.0 Methyl per 1000 C as determined by SEC/FT-IR analysis.
1. Coating composition comprising an ethylene copolymer containing not more than 5 mole-% comonomer, whereby the fraction of the ethylene copolymer having a molecular weight of 300 000 g/mol-600 000 g/mol has a methyl branching of more than 4.0 Methyl per 1000 C as determined by SEC/FT-IR analysis.
2. Coating composition according to claim 1 , whereby the comonomer(s) is/are selected from C 3 to C 10 alpha olefins.
3. Coating composition according to claim 1 , whereby the ethylene copolymer has an eta(1 kPas) of 1800 kPas or higher.
4. Coating composition according to claim 1 , whereby the ethylene copolymer has a Mw/Mn of 15 to 25.
5. Coating composition according to claim 1 , whereby the ethylene copolymer has a methyl branching of 1.0 to 3.7 Methyl per 1000 C as determined by SEC/FT-IR analysis.
6. Coating composition according to claim 5 comprising a pigment.
7. Coating composition according to claim 6 , wherein the pigment is carbon black.
8. Coating composition according to claim 6 , wherein the coating composition including the pigment has a density of at least 961.0 kg/m 3 .
9. Pipe being coated with the coating composition according to claim 1 .
10. Pipe according to claim 9 , wherein the coating layer is the outermost layer of the pipe.
11. Pipe according to claim 10 , whereby the coating layer representing the outermost layer of the pipe directly covers an adhesive layer comprising a polymeric composition obtained by grafting with an acid grafting agent.
12. Process for the coating of a pipe including the extrusion of a coating composition according to claim 1 .
13. Process according to claim 12 , whereby the pressure in the extruder for extrusion of the coating composition is 119 bar or lower at 50 rpm screw speed.
14. Process according to claim 12 , whereby the die temperature of the extruder for extrusion of the coating composition is 225° C. or lower at 50 rpm screw speed.
15. Process according to claim 12 , whereby the die temperature of the extruder for extrusion of the coating composition is 200° C. or lower at 150 rpm screw speed.