Crosslinkable high pressure polyethylene composition, a process for the preparation thereof, a pipe and a cable prepared thereof
View Patent ↗The present invention relates to a crosslinkable high pressure polyethylene composition containing ethylene silane copolymer resin having a content of silane of about 0.1 to 10 weight % and at least one silanol condensation catalyst. The invention further relates to a process for the preparation thereof, to a pipe made of said composition and to the use of the composition as an insulation for a cable.
1. A pipe made of a crosslinkable polyethylene composition containing a crosslinkable high-pressure ethylene silane copolymer resin having a content of silane of about 0.1 to 10 wt %, less than 40 wt % high density polyethylene, and at least one silanol condensation catalyst, wherein the ethylene silane copolymer resin has a density of >925 kg/m 3 and wherein the composition provides a pipe that has pressure resistance at 95 °C. of at least 4.4 MPa for a failure time of at least 1000 hours.
2. The pipe according to claim 1 , wherein the ethylene silane copolymer resin has a density of >928 kg/m 3 .
3. The pipe according to claim 2 , wherein the ethylene silane copolymer resin is an ethylene-vinyltriethoxysilane copolymer, an ethylene-gamma-methacryloxytriethoxysilane copolymer, an ethylene-vinyltrimethoxysilane copolymer or an ethylene-gamma-trimethoxysilane copolymer resin.
4. The pipe according to claim 1 , wherein the amount of high density polyethylene is 15-35 wt.-%.
5. The pipe according to claim 1 , wherein the MFR 2 at 190° C./2.16 kg of the composition is 0.1-100 g/10 mm.
6. The pipe according to claim 1 , wherein the elongation at break is >200% as measured according to ISO 527.
7. The pipe according to claim 1 , wherein the tensile strength at break is >12.5 Mpa as measured according to ISO 527.
8. The pipe according to claim 1 , wherein gel content is >65 weight % as measured according to ASTM D 2765.
9. The pipe according to claim 1 , wherein the polyethylene composition further comprises 0.1 to 2.0 wt.-% of a drying agent.
10. The pipe according to claim 1 , wherein the amount of high density polyethylene is 20-30 wt-%.
11. A pipe made of a crosslinkable polyethylene composition comprising an ethylene-vinyltrimethoxysilane copolymer resin having a content of silane of about 0.1 to 10 wt %, less than 40 wt % high density polyethylene, and at least one silanol condensation catalyst, wherein the ethylene silane copolymer resin has a density of >925 kg/m 3 and wherein the composition provides a pipe that has pressure resistance at 95 °C. of at least 4.4 MPa for a failure time of at least 1000 hours.
12. A pipe made of a crosslinkable polyethylene composition, the composition comprising:
a crosslinkable high-pressure ethylene silane copolymer resin having a content of silane of about 0.1 to 10 wt %;
at least one silanol condensation catalyst; and
20-30 wt % high density polyethylene;
wherein:
the ethylene silane copolymer resin has a density of >925 kg/m 3 ; and
the pipe has pressure resistance at 95° C. of at least 4.4 MPa for a failure time of at least 1000 hours.
13. A pipe made of a crosslinkable polyethylene composition, the composition comprising:
a crosslinkable high-pressure ethylene silane copolymer resin having a content of silane of about 0.1 to 10 wt %;
at least one silanol condensation catalyst; and
<40 wt % high density polyethylene;
wherein:
the ethylene silane copolymer resin has a density of >928 kg/m 3 ; and
the pipe has pressure resistance at 95° C. of at least 4.4 MPa for a failure time of at least 1000 hours.