Patent ID: 7166676

Claim:
A polymer blend composition, comprising: (a) from 1 to 99% by weight of Component (I) (based on the combined weights of Component (I) and Component (II)) of an ethylene copolymer, and wherein Component (I) is an ethylene copolymer having the following properties: (1) a density, d (g/cm3), of from 0.870 to 0.980; (2) an M w /M n of from 2.5 to 10, wherein M w and M n are, respectively, a weight average molecular weight and an number average molecular weight, both as measured by gel permeation chromatography (GPC); (3) when, in cross fractionation chromatography (CFC) of said ethylene copolymer, with respect to extraction at an arbitrary temperature T(° C.) falling within the range of between a first temperature, at which a maximum amount of extraction is exhibited and a second temperature, which is the lower temperature of either the temperature of 10° C. higher than said first temperature or 96° C., the relationship between said arbitrary temperature T(° C.) and a point in molecular weight on a molecular weight distribution profile of a copolymer fraction extracted at said arbitrary temperature T(° C.), at which point in molecular weight, said molecular weight distribution profile of the copolymer fraction shows a peak having a maximum intensity, is treated by the least squares method to obtain an approximate straight line within the range of between said first temperature and said second temperature; if there is the copolymer fraction, the amount of which is less than 1% by weight on the total amount, excluding purge, of copolymer fractions extracted at temperatures in the overall range of extraction temperatures in CFC, the copolymer fraction can be excluded from the calculation for the approximate straight line; the approximate straight line has a gradient within the range defined by the formula (I): −1≦{log Mp ( T 1 )−log Mp ( T 2 )}/( T 1 −T 2 )≦−0.005 (I), wherein: T 1 and T 2 are two different arbitrary extraction temperatures T(° C.) within the range of between said first temperature and said second temperature, and Mp(T 1 ) and Mp(T 2 ) are, respectively, molecular weights corresponding to T 1 and T 2 on said approximate straight line; and (4) the measurement of said ethylene copolymer by CFC shows characteristics, such that the sum of respective amounts of copolymer fractions extracted at temperatures, which are at least 10° C. lower than said first temperature, as defined above, is 8% by weight or less, based on the total amount, excluding purge, of copolymer fractions extracted at temperatures in the overall range of extraction temperatures in CFC; and (b) Component (II), wherein Component (II) includes a polymer selected from the group consisting of: (a) a second ethylene copolymer of Component (I) of different molecular weight or density, (b) a homogeneous narrow composition distribution ethylene interpolymer, and (c) a heterogeneous broad composition distribution ethylene interpolymer.