RESIN COMPOSITIONS AND USE THEREOF

摘要

A flexible resin composition of the invention comprises a polyethylene resin (A) and an ethylene- alpha -olefin random copolymer (B) comprising ethylene and a C3-C20 alpha -olefin at a specific ratio, and is characterized in that the MFR and density of the polyethylene resin (A) and the density, intrinsic viscosity, glass transition temperature, crystallinity, molecular weight distribution, B value, and g eta * value of the copolymer (B) lie respectively within specific ranges. This composition is excellent in melt flow characteristics, i.e., moldability, and can give a molded article excellent in the balance between flexibility and heat resistance. An ethylene- alpha -olefin copolymer resin composition of the invention comprises (A- alpha ) a linear ethylene- alpha -olefin copolymer comprising ethylene and a C4-C20 alpha -olefin and (B- alpha ) a long-chain branched ethylene- alpha -olefin random copolymer comprising ethylene and a C3-C20 alpha -olefin at a specific ratio, and the density and MFR of the copolymer (A- alpha ) and the density, MFR, intrinsic viscosity, glass transition temperature, crystallinity, molecular weight distribution, B value, and g eta * value of the copolymer (B- alpha ) lie respectively within specific ranges. A film of the invention is made from this resin composition. This ethylene- alpha -olefin copolymer resin composition is excellent in heat stability and high-speed moldability, and can give a film excellent in mechanical strength properties, low-temperature heat sealability, stability of seal, slip characteristics, antiblocking properties, handleability, and adaptability to high-speed filling in automatic filling and packaging. The obtained film also exhibits these effects.