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US 2003/0149181 A1Published application
Ethylene interpolymer blend compositions
OwnerBrian W.S. Kolthammer, Robert S. Cardwell +4inventors
InventorsBrian W.S. Kolthammer, Robert S. Cardwell, Ronald P. Markovich, Bharat I. Chaudhary, Adam E. Laubach, Jesus Nieto
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Abstract
Film, molded articles and fibers prepared from ethylene/α-olefin interpolymer compositions are disclosed. The interpolymer compositions are blends prepared by combining specified amounts of a narrow molecular weight distribution, narrow composition distribution breadth index interpolymer, and a broad molecular weight distribution, broad composition distribution breadth index interpolymer, with each blend component having a specified density, melt index and degree of branching.
Claims22
A molded article comprising an ethylene/α-olefin interpolymer composition comprising;
- (A) an ethylene/α-olefin interpolymer which;
- (i) has a narrow molecular weight distribution, defined as an Mw/Mn of less than about 3,
- (ii) has 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) has 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) has an aluminum residue content of less than or equal to about 250 ppm present in the interpolymer composition, and
- (v) is present in an amount of from about 15 to about 85% by weight (based on the combined weight of Components A and B);
- and
- (B) an ethylene/α-olefin interpolymer;
- which
- (i) has a broad molecular weight distribution, defined 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),;
- (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
- (iv) is present in an amount of from about 15 to about 85% by weight based on the combined weight of Components A and B;
- and wherein said molded article is made by rotational molding, injection molding or blow molding.
12 more elements
A film made from an ethylene/α-olefin interpolymer composition comprising;
- (A) an ethylene/α-olefin interpolymer which;
- (i) has a narrow molecular weight distribution, defined as an Mw/Mn of less than about 3,
- (ii) has 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) has 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) has an aluminum residue content of less than or equal to about 250 ppm present in the interpolymer composition, and
- (v) is present in an amount of from about 15 to about 85% by weight (based on the combined weight of Components A and B);
- and
- (B) an ethylene/α-olefin interpolymer;
- which
- (i) has a broad molecular weight distribution, defined as defined 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);
- (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
- (iv) is present in an amount of from about 15 to about 85% by weight based on the combined weight of Components A and B;
- and wherein said film is a cast film or a blown film or an extrusion coated film.
12 more elements
A fiber made from an ethylene/α-olefin interpolymer composition comprising;
- (A) an ethylene/α-olefin interpolymer which;
- (i) has a narrow molecular weight distribution, defined as an Mw/Mn of less than about 3,
- (ii) has 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) has 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) has an aluminum residue content of less than or equal to about 250 ppm present in the interpolymer composition, and
- (v) is present in an amount of from about 15 to about 85% by weight (based on the combined weight of Components A and B);
- and
- (B) an ethylene/α-olefin interpolymer;
- which
- (i) has a broad molecular weight distribution, defined as defined 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);
- (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
- (iv) is present in an amount of from about 15 to about 85% by weight based on the combined weight of Components A and B;
- and wherein said fiber is a staple fiber, a melt blown fiber or spun bonded fiber or gel spun fiber.
12 more elements
An interpolymer blend composition having 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;
- comprising
- (A) one or more ethylene/α-olefin interpolymers which;
- (i) has a narrow molecular weight distribution, defined as an Mw/Mn of less than about 3,
- (ii) has 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) has 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) has an aluminum residue content of less than or equal to about 250 ppm present in the interpolymer composition, and
- (v) is present in an amount of from about from about 5 to about 50% by weight (based on the combined weight of Components A and B;
- and
- (vi) has a density of from about 0.850 to about 0.908 g/cm3;
- and
- (B) an ethylene/α-olefin interpolymer;
- which
- (i) has a broad molecular weight distribution, defined as defined 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);
- (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
- (iv) 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 wherein
- (C) said interpolymer composition has an improvement in 23° C. Izod Impact of at least 5% over a blend of the same final melt index and density, but wherein the density of Component A is greater than or equal to 0.909 g/cm3.
16 more elements
Dependencies are inferred from the claim text.