申请人:——
公开号:US20010014718A1
公开(公告)日:2001-08-16
Asoft resin composition of the present invention comprises a polyethylene resin (A) and an ethylene/&agr;-olefin random copolymer (B) comprising ethylene and an &agr;-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 g&eegr;* 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/&agr;-olefin copolymer resin composition of the present invention comprises a liner ethylene /&agr;-olefin copolymer (A-&agr;) comprising ethylene and an &agr;-olefin having 4 to 20 carbon atoms and a long-chain branched ethylene/&agr;-olefin random copolymer (B-&agr;) comprising ethylene and an &agr;-olefin having 3 to 20 carbon atoms in a specific proportion, wherein a density and melt flow rate of the copolymer (A-&agr;) and a density, MFR, intrinsic viscosity, glass transition temperature, crystallinity, molecular weight distribution, B value and g&eegr;* values of the copolymer (B-&agr;) are each in a specific range. A film of the invention is produced from the resin composition.
The ethylene/&agr;-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.
本发明的软性树脂组合物包括聚乙烯树脂(A)和乙烯/α-烯烃随机共聚物(B),其中乙烯/α-烯烃随机共聚物(B)包括具有3至20个碳原子的α-烯烃和乙烯,并具有特定比例,而聚乙烯树脂(A)的熔流率和密度,以及共聚物(B)的密度,内在粘度,玻璃转移温度,结晶度,分子量分布,B值和g'值均在特定范围内。软性树脂组合物具有出色的熔融流动特性,即具有出色的成型性能,并能够提供在柔韧性和耐热性之间平衡出色的成型品。
本发明的乙烯/α-烯烃共聚物树脂组合物包括一种线性乙烯/α-烯烃共聚物(A-α),其中乙烯/α-烯烃共聚物(A-α)包括具有4至20个碳原子的α-烯烃和乙烯,以及一种长链支化乙烯/α-烯烃随机共聚物(B-α),其中乙烯/α-烯烃随机共聚物(B-α)包括具有3至20个碳原子的α-烯烃和乙烯,并具有特定比例,而共聚物(A-α)的密度和熔融速率,以及共聚物(B-α)的密度,熔流率,内在粘度,玻璃转移温度,结晶度,分子量分布,B值和g'值均在特定范围内。本发明的薄膜是由树脂组合物制成的。乙烯/α-烯烃共聚物树脂组合物具有出色的耐热稳定性和适用于高速成型的特性,并能够提供机械强度性能,低温热封性能和密封稳定性出色的薄膜,进一步具有滑动特性和防堵塞特性,因此具有出色的操作性能和适用于自动灌装机高速灌装的特性。该薄膜还具有上述效果。