The invention relates to a
polymer comprising units derived from
ethylene, said
polymer having: a) a Melt Index of from 0.05 to 20 g / 10 min as determined by ASTM-1238 Condition E; b) at least 10 per 1000 C-atoms of short chain branches, containing five carbon atoms or less, as determined by C13 NMR, and less than 3.5 mol %, of units derived from a copolymerizable ethylenically unsaturated ester, c) a density of from 0.90 to 0.94 g / cm3, preferably 0.91 to 0.935 g / cm3, especially 0.92 to 0.93 g / cm3 as determined by ASTM D1505, and d) a relaxation time as described herein of at least 10 s. Such polymers are obtainable by
polymerization by free
radical polymerization using a
chain transfer agent that incorporates into the
polymer chain such as an alpha-olefin, preferably propylene, as a
chain transfer agent, preferably in a tubular reactor under circumstances to favor LCB formation in a down
stream part of the tubular reactor. The polymer may be used for stretch hood film, preferably as a blown film coextruded tube comprising: a) a core of the above polymer; and b) a
skin layer, on each side of the core which may be of the same or different composition, comprising at least 60 wt % of an LLDPE having density of 0.91 to 0.94 g / cm3 as determined by ASTM-D 1238 Condition E and
hexane extractables less than 1.5 wt %, said
skin layer containing less than 7500 ppm of anti-block
particulates and said film having an elastic
recovery after a 100% stretch of at least 40% and providing a normalized holding force per 100 μm thickness pre-stretch at 85% stretch after an initial stretch of 100% of at least 20 N / 50 mm at a deformation rate of less than 10% of the starting length per second.