Patent ID: 6448341
Filing Date: 2002-09-10
Classification: C08F,C08L

Abstract:
A molded article comprising an ethylene/&agr;-olefin interpolymer composition wherein said interpolymer composition has a density of from about 0.940 to about 0.960 and a melt index, I2, of from about 3 to about 100 g/10 min; and comprises(A) an interpolymer of ethylene with at least one C3-8 &agr;-olefin and present in an amount of from about 5 to about 50% by weight, based on the combined weight of Components A and B, and having (i) a narrow molecular weight distribution, defined as an Mw/Mn of less than about 3, (ii) a narrow composition distribution breadth index, CDBI, defined as the weight percent of the polymer molecules having a comonomer content within 50 percent of the median total molar comonomer content of Component A, which is greater than about 50 percent; (iii) a degree of branching less than or equal to 2 methyls/1000 carbons in about 15 percent or less by weight, based on the total weight of Component A; (iv) an aluminum residue content of less than or equal to about 250 ppm present in the interpolymer composition, and (v) a density of from about 0.850 to about 0.908 g/cm3; and (B) one or more homopolymers or interpolymers of ethylene and/or at least one C3-8 &agr;-olefin and is present in an amount of from about 50 to about 95% by weight, based on the combined weight of Components A and B, and (i) has a broad molecular weight distribution, define as an Mw/Mn of greater than about 3, (ii) has a broad composition distribution with a degree of branching less than or equal to 2 methyls/1000 carbons in about 10 percent or more by weight, based on the total weight of Component B, and (iii) has a degree of branching greater than or equal to 25 methyls/1000 carbons in about 25 percent or less by weight, based on the total weight of Component B, and wherein(a) said interpolymer composition has an improvement in 23Â° C. Izod Impact of at least 5% over a blend of Component A and Component B having the same final melt index and density, but wherein the density of Component A is greater than or equal to 0.909 g/cm3 and (b) said molded article is made by rotational molding, injection molding or blow molding.