| 摘要 |
The object of this invention is to provide a blown film which even if it is thin, is strong, feels firm and has high transparency and this invention provides a blown film comprising a multi-layer film of 3 or more layers comprising surface layers made of linear low-density polyethylene 1 satisfying the following requirements (A) to (C) and middle layers, wherein at least one of the middle layers is a layer comprising a resin composition comprising low-density polyethylene and linear low-density polyethylene 2 having a crystallization temperature higher by at least 2° C. than the crystallization temperature of the linear low-density polyethylene 1, as well as a blown film having a haze value of 7% or less, a tear strength of at least 110 kN/m in the MD direction, and a 1% secant modulus (1% SM) of at least 190 MPa. (A): a composition distribution variation coefficient (Cx) represented by the following equation (1) is not more than 0.5, <paragraph lvl="0"><in-line-formula>Cx=sigma/SCBave (1) </in-line-formula> wherein sigma is a standard deviation of composition distribution, and SCBave is an average branching degree, (B): a content (a) of cold xylene-soluble portion in terms of % by weight based on the weight of the linear low-density polyethylene 1 and the density (d) satisfy the following inequality (2), <paragraph lvl="0"><in-line-formula>a<4.8x10-5x(950-d)3+10-6x(950-d)4+1 (2) </in-line-formula>(C): a crystallization temperature (Tc) and a density (d) satisfy the following inequality (3), <paragraph lvl="0"><in-line-formula>Tc>0.763xd-599.2 (3) </in-line-formula>
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