Oriented film comprising at least five layers

Claim 2

An oriented multilayer film comprising: a cross-linked core layer comprising either (a) an ethylene vinyl acetate copolymer or (b) a three component blend of (1) a linear low density polyethylene, (2) a linear medium density polyethylene and (3) an ethylene vinyl acetate copolymer; two cross-linked interior layers each comprising a linear low density polyethylene; and two cross-linked surface layers each comprising a three component blend cf (1) a linear low density polyethylene, (2) a linear medium density polyethylene, and (3) an ethylene vinyl acetate copolymer.

Claim 3

An oriented multilayer film according to claim 1 having 5 layers and comprising: a cross-linked core layer comprising either (a) an ethylene vinyl acetate copolymer or (b) a three component blend of (1) from about 40%, by weight, to about 60%, by weight, of a linear low density polyethylene, (2) from about 20%, by weight, to about 30%, by weight, of a linear medium density polyethylene and (3) from about 20%, by weight, to about 30%, by weight, of an ethylene vinyl acetate copolymer; two cross-linked intermediate layers each comprising a linear low density polyethylene; and two cross-linked surface layers each comprising a three component blend of (1) from about 40% to about 60%, by weight, of a linear low density polyethylene, (2) from about 20% to about 30%, by weight, of a linear medium density polyethylene, and (3) from about 20% to about 30%, by weight, of an ethylene vinyl acetate copolymer.

Claim 4

An oriented multilayer film according to claim 1 having 5 layers and comprising: a cross-linked core layer consisting essentially of either (a) about 100%, by weight, of an ethylene vinyl acetate copolymer comprising from about 3.3% to about 4.1% vinyl acetate derived units, said ethylene vinyl acetate copolymer having a density of from about 0.9232 to about 0.9250 grams per cubic centimeter at 23°C or (b) a three component blend of (1) about 55%, by weight, of a linear low density polyethylene having a density of about 0.920 grams per cubic centimeter at 23°C, (2) about 28%, by weight, of a linear medium density polyethylene having a density of about 0.935 grams per cubic centimeter at 23°C and (3) about 17%, by weight, of an ethylene vinyl acetate copolymer comprising from about 3.3% to about 4.1% vinyl acetate derived units, said ethylene vinyl acetate copolymer having a density of from about 0.9232 to about 0.9250 grams per cubic centimeter at 23°C; two cross-linked intermediate layers each consisting essentially of about 100%, by weight, of a linear low density polyethylene having a density of about 0.920 grams per cubic centimeter at 23°C; and two cross-linked surface layers each consisting essentially of a three component blend of (1) about 50%, by weight, of a linear low density polyethylene having a density of about 0.920 grams per cubic centimeter at 23°C, (2) about 25%, by weight, of a linear medium density polyethylene having a density of about 0.935 grams per cubic centimeter at 23°C, and (3) about 25%, by weight, of an ethylene vinyl acetate copolymer comprising fran about 3.3% to about 4.1% vinyl acetate derived units, said ethylene vinyl acetate compolymer having a density of from about 0.9232 to about 0.9250 grams per cubic centimeter at 23°C.

Claim 5

An oriented multilayer film according to claim 1 in which the two cross-linked surface layers each also comprise (4) at least one ultraviolet light stabilizer.

Claim 6

An oriented multilayer film according to claim 2 adapted for use as a storm window in which the two cross-linked surface layers each also comprise (4) from about 500 ppm to about 3,000 ppm of at least one hindered amine ultraviolet light stabilizer.

Claim 7

A multilayer film according to claim 3 adapted for use as an exterior storm window in which the two cross-linked surface layers each also contain (4) about 1,500 parts per million of at least one hindered amine ultraviolet light stabilizer.

Claim 8

A multilayer film according to claim 4 comprising from about 500 to about 3,000 parts per million of said ultraviolet light stabilizer.

Claim 9

A multilayer film according to claim 4 or 5 comprising about 1,000 to about 2,000 parts per million of said ultraviolet light stabilizer.

Claim 10

A multilayer film according to-claim 5 or 6 which has been cross-linked with from about 3 MR to about 8 MR of irradiation.

Claim 11

A multilayer film according to claim 9 which has been cross-linked with from about 5 MR to about 7 MR of irradiation.

Claim 12

A multilayer film according to any one of claims 5, 6, 9 or 10 which has been oriented by racking at a racking ratio of from about 3.0 to about 4.0 in both the longitudinal and transverse directions.

Claim 13

A multilayer film according tc claim 11 which has been oriented by racking at a racking ratio of fran about 3.0 to about 3.5 in both the longitudinal and transverse directions.

Claim 14

A multilayer film according to claim 2 or 3 which has been cross-linked with from about 1 MR to about 5 MR of irradiation.

Claim 15

A multilayer film according to claim 13 which has been cross-linked with fran about 2 MR to about 4 MR of irradiation.

Claim 16

A multilayer film according to any of claims 2, 3, 13 or 14 which has been oriented by racking at a racking ratio of from about 4.0 to about 6.0 in both the longitudinal and transverse directions.

Claim 17

A multilayer film according to claim 15 which has been oriented by racking at a racking ratio of from about 4.5 to about 5.5 in both the longitudinal and transverse directions.

Claim 18

A multilayer film according to claim 2 or 5 in which said ethylene vinyl acetate copolymer comprises from about 2%, by weight, to about 18%, by weight, of vinyl acetate derived units.

Claim 19

A multilayer film according to claim 17 in which said vinyl acetate copolymer comprises fran about 2%, by weight, to about 10%, by weight, of vinyl acetate derived units.

Claim 20

A multilayer film according to any of claims 1 to 18 further comprising a colorant additive to at least one of said layers.

Claim 21

-20. A multilayer film according to claim 19 in which the colorant additive is solely in said core layer.

Claim 22

2 1. A multilayer film according to any of claims 1 to 20 in which the two surface layers are substantially equal to each other and the sum of the thicknesses of the two surface layers comprise fran about 40% to about 60% of the total thickness of the film, (b) the thicknesses of the two intermediate layers are substantially equal to each other and the sum of the thicknesses of the two intermediate layers comprises fran about 40% to about 60% of the total thickness of the film, (c) the thickness of the core layer comprises from about 10% to about 30% of the total film thickness and (d) the total film thickness is from about 50 gauge to about 200 gauge.