CROSS-LINKABLE POLYETHYLENE-BASED COMPOSITION, METHOD OF MANUFACTURING A TUBE THEREFROM, AND TUBE Russian patent published in 2005 - IPC

FIELD: polymer materials.

SUBSTANCE: composition contains 0.05 to 0.24 hydrolyzable silane groups per 100 methylene units and shows standard density at least 954 kg/m³. Flowability factor of composition melt is below 1.5 g/10 min under loading 5 kg and above 2 g/10 min under loading 21.6 kg as measured in accordance with ASTM standard D 1238. Tube manufacture process envisages extrusion of composition in the form of tube in the first stage and subsequent hydrolysis of the tube in order to link cross-linkable polyethylene. Tubes manufactured according to present invention show high long-term resistance to pressure above 12.5 MPa as measured according to ISO/TR standard 9080 and can be used for transportation of fluid substances under high pressure.

EFFECT: improved consumer's quality of tubes.

13 cl, 4 ex