Resin composition comprising a linear ethylene/alpha-olefin-copolymer and a long-chain branched ethylene/alpha-olefin-copolymer and films of the same

摘要

Asoft resin composition of the present invention comprises a polyethylene resin (A) and an ethylene/α-olefin random copolymer (B) comprising ethylene and an α-olefin having 3 to 20 carbon atoms at a specific proportion, wherein an MFR and density of the polyethylene resin (A), and a density, intrinsic viscosity, glass transition temperature, crystallinity, molecular weight distribution, B value and gη* values of the copolymer (B) are each in a specific range. The soft resin composition is excellent in melt flow characteristics, namely excellent in moldability, and is capable of providing moldings excellent in balance between pliability and heat resistance.;An ethylene/α-olefin copolymer resin composition of the present invention comprises a liner ethylene /α-olefin copolymer (A-α) comprising ethylene and an α-olefin having 4 to 20 carbon atoms and a long-chain branched ethylene/α-olefin random copolymer (B-α) comprising ethylene and an α-olefin having 3 to 20 carbon atoms in a specific proportion, wherein a density and melt flow rate of the copolymer (A-α) and a density, MFR, intrinsic viscosity, glass transition temperature, crystallinity, molecular weight distribution, B value and gη* values of the copolymer (B-α) are each in a specific range. A film of the invention is produced from the resin composition.;The ethylene/α-olefin copolymer resin composition is excellent in heat stability and suitability for high-speed molding, and can provide the films excellent in mechanical strength properties, low temperature heat-sealing properties and sealing stability, and further in slip characteristics and anti-blocking properties thereby being excellent in handling properties and suitability for high-speed filling upon packaging by automatic filling machines. The film also exhibits the effect as described above.