High impact compositions of polyethylene and polypropylene block copolymers

Claim 2

A BINARY POLYPROPYLENE COMPOSITION HAVING SYNERGISTIC IMPACT PROPERTIES WHICH COMPRISES: A. FROM ABOUT 3 TO ABOUT 15 PERCENT BY WEIGHT OF THE TOTAL COMPOSITION OF A LINEAR POLYETHYLENE COMPONENT HAVING A MELT INDEX BETWEEN ABOUT 0.5 AND ABOUT 0.9 AND A DENSITY OF AT LEAST 0.93, AND II. FROM ABOUT 85 TO ABOUT 97 PERCENT BY WEIGHT OF THE TOTAL COMPOSITION OF A BLOCK COPOLYMER COMPONENT CONTAINING A. FROM ABOUT 60 TO ABOUT 95 PERCENT BY WEIGHT OF A POLYPROPYLENE PREBLOCK, AND B. FROM ABOUT 5 TO ABOUT 40 PERCENT BY WEIGHT OF A POSTBLOCK OF A RANDOM COPOLYMER OF ETHYLENE AND ANOTHER A-OLEFIN, WHEREIN THE CONTENT OF ETHYLENE DERIVED UNITS IN SAID POSTBLOCK RANGES BETWEEN ABOUT 25 AND ABOUT 75 MOLE PERCENT.

Claim 3

A polypropylene composition according to claim 1 wherein the linear polyethylene component is a homopolymer of ethylene.

Claim 4

A polypropylene composition according to claim 1 wherein the linear polyethylene component is a random copolymer of ethylene and no more than about 5 mole percent of an Alpha -olefin having 3 to 8 carbon atoms.

Claim 5

A polypropylene composition according to claim 1 wherein the linear polyethylene component is present in an amount from about 3 to about 10 percent by weight of the total composition.

Claim 6

A polypropylene composition according to claim 1, wherein the polypropylene preblock is a polypropylene homopolymer.

Claim 7

A Polypropylene composition according to claim 1, wherein the polypropylene preblock is a random copolymer of propylene and no more than 5 mole percent of another Alpha -olefin having from 2 to 8 carbon atoms.

Claim 8

A polypropylene composition according to claim 1, wherein the random copolymer postblock is a random copolymer of ethylene and propylene and the content of ethylene derived units in said postblock is between about 30 and about 70 mole percent.

Claim 9

A polypropylene composition according to claim 7, wherein the content of ethylene derived units in said postblock is between about 35 and about 60 mole percent.

Claim 10

A binary polypropylene composition having synergistic impact properties which comprises: I. from about 3 to about 10 percent by weight of the total composition of a linear polyethylene homopolymer component having a melt index between about 0.5 and about 0.9 and a density of at least 0.93, and II. from about 90 to about 97 percent by weight of the total composition of a block copolymer component containing a. from about 75 to about 90 percent by weight of a polypropylene homopolymer preblock, and b. from about 10 to about 25 percent by weight of a postblock of a random copolymer of ethylene and propylene, wherein the content of ethylene derived units in said postblock ranges between about 30 and about 70 mole percent.

Claim 11

A binary polypropylene composition having synergistic impact properties which comprises: I. from about 3 to about 10 percent by weight of the total composition of a linear polyethylene homopolymer component having a melt index between about 0.5 and about 0.9 and a density of at least 0.93, and II. from about 90 to about 97 percent by weight of the total composition of a block copolymer component containing a. from about 75 to about 90 percent by weight of a polypropylene homopolymer preblock, and b. from about 10 to about 25 percent by weight of a postblock of a random copolymer of ethylene and propylene, wherein the content of ethylene derived units in said postblock ranges between about 30 and about 70 mole percent.