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    • 6. 发明申请
    • Heat-Sealable Propylene-Based Polymer Composition, Heat-Sealable Film, and Uses Thereof
    • 可热封的丙烯基聚合物组合物,热封膜及其用途
    • US20090258243A1
    • 2009-10-15
    • US12083764
    • 2006-10-13
    • Kazuhide MaruyamaIchiro TakeishiNorihide InoueHiroshi Hoya
    • Kazuhide MaruyamaIchiro TakeishiNorihide InoueHiroshi Hoya
    • B32B27/32C08L23/16
    • B32B27/32C08J5/18C08J2323/10C08L23/0815C08L23/10C08L23/12C08L2205/02C08L2205/03Y10T428/31909Y10T428/31913Y10T428/31938C08L2666/06
    • The heat-sealable propylene-based polymer composition of the present invention comprises a propylene polymer composition (A) comprising a propylene polymer component (a1) and a propylene/ethylene random copolymer component (a2) having a propylene unit content of 63 to 77% by mol and an ethylene unit content of 23 to 37% by mol, an ethylene/(α-olefin random copolymer (B), and a soft propylene polymer (C) which has an ethylene content of 0 to 30% by mol and an α-olefin content of 0 to 30% by mol and whose melting point, as measured by a differential scanning calorimeter (DSC), is not higher than 100° C. or is not observed; and this heat-sealable propylene-based polymer composition contains the propylene polymer composition (A) in an amount of 50 to 90% by mass, the ethylene/α-olefin random copolymer (B) in an amount of 3 to 25% by mass and the soft propylene polymer (C) in an amount of 0.5 to 40% by mass ((A)+(B)+(C)=100% by mass). The present invention also provides a heat-sealable film using the composition and a packaging bag comprising the film. The heat-sealable film of the present invention has high heat-seal strength, is little decreased in heat-seal strength even after heat treatment and is excellent in blocking resistance, rigidity and low-temperature impact resistance.
    • 本发明的可热封丙烯类聚合物组合物包括丙烯聚合物组分(a1)和丙烯单元含量为63-77%的丙烯/乙烯无规共聚物组分(a2)的丙烯聚合物组合物(A) 乙烯单元含量为23〜37摩尔%,乙烯/(α-烯烃无规共聚物(B))和乙烯含量为0〜30摩尔%的软丙烯聚合物(C),和 通过差示扫描量热计(DSC)测定的熔点为0〜30摩尔%的α-烯烃含量为100℃以下,或者未观察到,该热封性丙烯系聚合物组合物 含有量为50〜90质量%的丙烯聚合物组合物(A),乙烯/α-烯烃无规共聚物(B)的量为3〜25质量%,软质丙烯聚合物(C)为 (A(A)+(B)+(C)= 100质量%)为0.5〜40质量% 使用该组合物的密封膜和包含该膜的包装袋。 本发明的热封膜具有高的热封强度,即使热处理后的热封强度也几乎没有降低,并且抗粘连性,刚性和耐低温冲击性优异。