Multilayer plastic articles

Claim 2

A multilayer plastic structure comprising a laminate of at least one layer of a high gas barrier polymer and at least one layer of an intimate blend of at least one propylene based polymer and at least one linear low density polyethylene wherein the total amount of the linear low density polyethylene is equal to or less than about 30 percent by weight of said blend, the structure having an outstanding balance of properties including gas barrier resistance including permeability to oxygen of not more than 3 cc-mil/100 sq. in. day, resistance to delamination, top load strength and low temperature drop impact resistance according to ASTM test 2463-74.

Claim 3

The invention defined in claim 1 wherein the propylene based polymer is polypropylene homopolymer.

Claim 4

The invention defined in claim 1 wherein the propylene based polymer is a propylene-ethylene copolymer including about 2-5 mole percent ethylene copolymerized with the propylene.

Claim 5

The invention defined in claim 1 wherein the linear low density polyethylene has a density of less than about 0.93 grams per cubic centimeter and a melt index of less than 10 grams per ten minutes.

Claim 6

The invention defined in claim 1 wherein said linear low density polyethylene has a density of about 0.92 grams per cubic centimeter and a melt index of less than about 2 grams/10 minutes.

Claim 7

The invention defined in claim 1 wherein said linear low density polyethylene is equal to about 20 percent by weight of the said blend.

Claim 8

A container formed from the structure of claim 1.

Claim 9

The invention defined in claim 1 wherein said high gas barrier polymer is an ethylene-vinyl alcohol copolymer.

Claim 10

A multilayer plastic structure comprising a laminate of a pair of outer layers and a centrally located core layer wherein said centrally located core layer includes at least one high gas barrier polymer and said outer layers are each an intimate blend of at least one propylene based polymer and at least one linear low density polyethylene with the total amount of the linear low density polyethylene being equal to or less than 30 percent by weight of said blend, the structure having an outstanding balance of properties including gas barrier resistance including permeability to oxygen of not more than 3 cc-mil/100 sq. in. day, resistance to delamination, top load strength and low temperature drop impact resistance according to ASTM test 2463-74.

Claim 11

A multilayer plastic structure comprising a laminate of a pair of outer layers and a centrally located core layer wherein said centrally located core layer includes at least one high gas barrier polymer and said outer layers are each an intimate blend of at least one propylene based polymer and at least one linear low density polyethylene with the total amount of the linear low density polyethylene being equal to or less than 30 percent by weight of said blend, the structure having an outstanding balance of properties including gas barrier resistance including permeability to oxygen of not more than 3 cc-mil/100 sq. in. day, resistance to delamination, top load strength and low temperature drop impact resistance according to ASTM test 2463-74.

Claim 12

The invention defined in claim 9 wherein the propylene based polymer is polypropylene homopolymer.

Claim 13

The invention defined in claim 9 wherein the propylene based polymer is a propylene-ethylene copolymer including about 2-5 mole percent ethylene copolymerized with the propylene.

Claim 14

The invention defined in claim 9 wherein the linear low density polyethylene has a density of less than about 0.93 grams per cubic centimeter and a melt index of less than about 10 grams per ten minutes.

Claim 15

The invention defined in claim 9 wherein said linear low density polyethylene has a density of about 0.92 grams per cubic centimeter and a melt index of less than about 2 grams per ten minutes.

Claim 16

The invention defined in claim 9 wherein said linear low density polyethylene is equal to about 20 percent by weight of the said blend.

Claim 17

A container formed from the structure of claim 9.

Claim 18

The invention defined in claim 9 wherein said high gas barrier polymer is an ethylene-vinyl-alcohol copolymer.

Claim 19

A multilayer plastic structure comprising a laminate of a pair of outer layers, a pair of intermediate adhesive layers and a centrally located core layer wherein: said outer layers being formed from an intimate blend of at least one propylene based polymer and at least one linear low density polyethylene wherein the toal amount of the linear low density polyethylene is equal to or less than about 30 percent by weight of said blend; said intermediate adhesive layers being formed from at least one olefinic hydrocarbon polymer; and said centrally located core layer being formed from at least one high gas barrier polymer, the structure having an outstanding balance of properties including gas barrier resistance including permeability to oxygen of not more than 3 cc-mil/100 sq.in. day, resistance to delamination, top load strength and low temperature drop impact resistance according to ASTM test 2463-74.

Claim 20

A multilayer plastic structure comprising a laminate of a pair of outer layers, a pair of intermediate adhesive layers and a centrally located core layer wherein: said outer layers being formed from an intimate blend of at least one propylene based polymer and at least one linear low density polyethylene wherein the toal amount of the linear low density polyethylene is equal to or less than about 30 percent by weight of said blend; said intermediate adhesive layers being formed from at least one olefinic hydrocarbon polymer; and said centrally located core layer being formed from at least one high gas barrier polymer, the structure having an outstanding balance of properties including gas barrier resistance including permeability to oxygen of not more than 3 cc-mil/100 sq.in. day, resistance to delamination, top load strength and low temperature drop impact resistance according to ASTM test 2463-74.

Claim 21

The invention defined in claim 17 wherein the propylene based polymer is polypropylene homopolymer.

Claim 22

The invention defined in claim 17 wherein the propylene based polymer is a propylene-ethylene copolymer including about 2-5 mole percent ethylene copolymerized with the propylene.

Claim 23

The invention defined in claim 17 wherein the linear low density polyethylene has a density of less than about 0.93 grams per cubic centimeter and a melt index of less than about 10 grams per ten minutes.

Claim 24

The invention defined in claim 17 wherein the linear low density polyethylene has a density of about 0.92 grams per cubic centimeter and a melt index of less than about 2 grams per ten minutes.

Claim 25

The invention defined in claim 17 wherein said linear low density polyethylene is equal to about 20 percent by weight of the said blend.

Claim 26

A container formed from the structure of claim 17.

Claim 27

The invention defined in claim 15 wherein the high gas barrier polymer is an ethylene-vinyl alcohol copolymer.

Claim 28

A composition of matter comprising a blend of a propylene based polymer that is a copolymer of ethylene and propylene and a linear low density polyethylene wherein the total amount of the linear low density polyethylene is no more than about 20 percent by weight of said blend.

Claim 29

A composition of matter comprising a blend of a propylene based polymer that is a copolymer of ethylene and propylene and a linear low density polyethylene wherein the total amount of the linear low density polyethylene is no more than about 20 percent by weight of said blend.

Claim 30

The invention defined in claim 25 wherein the copolymer is about 2 to 4 mole percent ethylene and 96 to 98 mole percent polypropylene.

Claim 31

The invention defined in claim 25 wherein the propylene based polymer is a propylene-ethylene copolymer including about 2-5 mole percent ethylene copolymerized with the propylene, the copolymer being about 20 weight percent of the blend.

Claim 32

The invention defined in claim 25 wherein the linear low density polyethylene has a density of less than about 0.93 grams per cubic centimeter and a melt index of less than 10 grams per ten minutes.

Claim 33

The invention defined in claim 25 wherein said linear low density polyethylene has a density of about 0.92 grams per cubic centimeter and a melt index of less than about 2 grams/10 minutes.

Claim 34

The invention defined in claim 25 wherein said linear low density polyethylene is equal to about 20 percent by weight of the said blend and the copolymer has a density of about 0.89 to 0.9/gms/cc and a melt index of less than about 30 grams/10 min.