438 or those made using vanadium catalysts or those made using constrained geometry catalysts in a batch reactor also having relatively high olefin concentrations as described in u s pat no 5 064 802 or in ep 0 416 815 a2 typically homogeneously branched linear ethylene polymers are ethylene u03b1 olefin interpolymers wherein the u03b1 olefin is at least one c 3 c 20 u03b1 olefin for example propylene 1 butene 1 pentene 4 methyl 1 pentene 1 heptene 1 hexene and 1 octene and preferably the at least one c 3 c 20 u03b1 olefin is 1 butene 1 hexene 1 heptene or 1 octene most preferably the ethylene u03b1 olefin interpolymer is a copolymer of ethylene and a c 3 c 20 u03b1 olefin and especially an ethylene c 4 c 8 u03b1 olefin copolymer such as an ethylene 1 octene copolymer ethylene 1 butene copolymer ethylene 1 pentene copolymer or ethylene 1 hexene copolymer suitable homogeneously branched linear ethylene polymers for use in the invention are sold under the designation of tafmer by mitsui chemical corporation and under the designations of exact and exceed resins by exxon chemical 5 company the term u201c substantially linear ethylene polymer u201d as used herein means that the bulk ethylene polymer is substituted on average with 0 01 long chain branches 1000 total carbons to 3 long chain branches 1000 total carbons wherein u201c total carbons u201d includes both backbone and branch carbons preferred polymers are substituted with 0 01 long chain branches 1000 total carbons to 1 long chain branches 1000 total carbons more preferably from 0 05 long chain branches 1000 total carbons to 1 long chain branched 1000.