C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/5163, 204/91
C08L 23/02 (2006.01) C08J 3/28 (2006.01) C08J 5/00 (2006.01) C08J 7/18 (2006.01) C08L 23/00 (2006.01) C08L 23/08 (2006.01)
Patent
CA 1195792
ABSTRACT OF THE INVENTION Drip irrigation tubing cross-linked by irradiation, the tubing having a burst strength at 80°C greater than about 3612 hours at 400 psi hoop stress and greater than about 8008 hours at 320 psi hoop stress. The tubing is formed by profile extrusion of a composition comprised of: (1) more than about 80% and less than about 97% by weight of a low pressure, low density hydrocarbon interpolymer; (2) more than about 2% and less than about 10% by weight of a copolymer of ethylene with a vinyl ester of C1-C30 monocarboxylic acid and other alpha olefins in minor concentrations providing a copolymer having a density between 0.91 and 0.94 gm\cm3; (3) more than about 0.01% and less than about 3% by weight of at least one ultraviolet stabilizer; and (4) less than about 0.5% by weight of at least one anti-oxidant stabilizer which permits cross-linking by irradiation.
410351
Hopley William G.
Union Carbide Corporation
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