Resin composition and film suitable for agricultural covering material

Claim 1

A film for an agricultural covering material, which has a thickness of 5 to 20 μm and is obtained by subjecting a starting resin composition to the inflation film-forming operation at a blow ratio of at least 2, said resin composition comprising a blend comprising (A) a resin of a random copolymer of ethylene with an α-olefin having at least 3 carbon atoms, which has a melt flow rate of 0.02 to 0.08 g/10 min 190° C.), a crystallinity of at least 50% by the X-ray diffractometry and a density (D A ) of 0.935 to 0.950 g/cc as determined at 20° C. and (B) a resin of a random copolymer of ethylene with an α-olefin having at least 4 carbon atoms, which has a melt flow rate of 0.1 to 5 g/10 min (as determined at 190° C.), a crystallinity of at least 40% by the X-ray diffractometry and a melting point of 115 to 130° C., at an (A)/(B) weight ratio of from 92/8 to 70/30, wherein the density (D B ) (g/cc) of the random copolymer resin as the component (B), determined at 20° C., satisfied the following requirements: 0.905≦D.sub.B ≦0.935; and D.sub.B ≦0.9D.sub.A +0.09 wherein D A stands for the density of the random copolymer resin as the component (A), determined at 20° C.