Bubblepack film comprises surface layers of linear low-density polyethylene and at least one middle layer comprising a blend of low-density polyethylene and linear low-density polyethylene

摘要

Bubblepack film comprises surface layers of linear low-density polyethylene (I) a middle layer comprising a blend of low-density polyethylene and linear low-density polyethylene (II), where the crystallization temperature of (II) is at least 2 deg C higher than that of (I), and (I) satisfies specified mathematical relationships. Bubblepack film comprises surface layers of linear low-density polyethylene (I) and at least one middle layer comprising a blend of low-density polyethylene and linear low-density polyethylene (II), where the crystallization temperature of (II) is at least 2 deg C higher than that of (I), and (I) satisfies the following mathematical relationships: (A) the deviation coefficient of the composition distribution (Cx), as defined by equation (1), is no more than 0.5 Cx = =s/SCBave (1) where =s is the standard deviation of the composition distribution and SCBave is the average degree of branching; (B) the xylene solubles content (wt.%) is less than 4.8 * 10-5 * (950-d)3 + 10-6 * (950-d)4 +1 where d is the density; and (C) the crystallization temperature is greater than: 0.763 * d-599.2.