STRENGSPRUTBAR KOMPOSITION FOR FRAMSTELLNING AV SLANG, FORFARANDE FOR FRAMSTELLNING AV VERMEHERDAD SLANG SAMT FORNETAD OCH VERMEHERDAD SLANG

摘要

Drip irrigation tubing cross-linked by irradiation, the tubing having a burst strength at 80.degree.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.