Multilayer polyolefin-containing film

Claim 2

An oriented multilayer film comprising: a cross-1 inked 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 intermediate layers each comDrisina a linear low density polyethylene; and two cross-linked surface layers each comprising a three component blend of (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 as claimed in claim 1 wherein said two cross-linked surface layers further include at least one ultraviolet lioht stabilizer.

Claim 4

An oriented five layer film comprising: a cross-linked core layer comprising either (a) an ethylene vinyl acetate copolymer or (b) a three component blend of (1) from 40%, by weight, to 60%, by weight, of a linear low density polyethylene, (2) from 20%, by weight, to 30%, by weight, of a linear medium density polyethylene and (3) from 20£, by weight, to 30%, by weight, of an ethylene vinyl acetate copoly mer; two cross-linked intermediate layers each comprising a linear low density polyethylene; and • \ V -59- two cross-linked surface layers each comprising a component blend weight, of an ethylene vinyl acetate copolymer.

Claim 5

An oriented five layer film comprising: a cross-linked core layer comprising either (a) an ethylene vinyl acetate copolymer or (b) a three component blend of (1) from 40%, by weight, to 60%, by weight, of a linear low density polyethylene, (2) from 20%, by weight, to 30%, by weight, of a linear medium density polyethylene and (3) from 20£, by weight, to 30%, by weight, of an ethylene vinyl acetate copoly mer; two cross-linked intermediate layers each comprising a linear low density polyethylene; and • \ V -59- two cross-linked surface layers each comprising a component blend weight, of an ethylene vinyl acetate copolymer.

Claim 6

An oriented five layer film as claimed in claim 3 suitable for use as a packaging material.

Claim 7

An oriented five layer film as claimed in claim 3 suitable for use as a storm window and said two cross-linked surface layers each comprises a four component blend with the additional component being from 5Q0 ppm to 3000 ppm of at least one hindered amine ultraviolet light stabilizer.

Claim 8

An oriented five layer film suitablefor use as a packaging material comprising: a cross-linked core layer consisting essentially of either (a) about 100%, by weight, of an ethylene vinyl acetate copolymer comprising from 3.3% to 4.1t vinyl acetate derived units, said ethylene vinyl acetate copolymer having a density of from centigrade or (b) a three component blend of (1) about 55%, by weight, or a linear low density polyethylene having a density of about 0.920 grams per cubic centimeter at 23 degrees centigrade, (2) about of (1) from 40% to 60%, by weight, of a linear low density polyethylene, (2) from 20% to 30%, by Height, of a linear medium density polyethylene, and (3) from 201 to 30%, by 0.9232 to 0.9250 grams per cubic centimeter at 23 degrees KJ .f'V ,30CT»87 - 60 - 28%, by weight of a linear medium density polyethylene having a density of about 0.935 grams per cubic centimeter at 23 degrees centigrade and (3) about 17X, by weight, of an ethylene vinyl acetate copolymer comprising from 3.3*6 to 4.1% vinyl acetate derived units, said ethylene vinyl acetate copolymer having a density of from 0.9232 to 0.9250 grams per cubic centimeter at 23 degrees centigrade; two cross-linked intermediate layers each consisting essentially of about 1002, by weight, of a linear low density polyethylene having a density of about 0.920 grams per cubic centimeter at 23 degrees centigrade; 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 degrees centigrade, (2) about 25%, by weight, of a linear medium density polyethylene having a density of about 0.935 grams per cubic centimeter at 23 degrees centigrade, and (3) about 25%, by weight, of an ethylene vinyl acetate copolymer comprising from 3.3% to 4.1% vinyl acetate derived units, said ethylene vinyl acetate copolymer having a density of from 0.9232 to 0.9253 grams per cubic centimeter at 23 degrees centigrade.

Claim 9

An oriented five layer film suitablefor use as a packaging material comprising: a cross-linked core layer consisting essentially of either (a) about 100%, by weight, of an ethylene vinyl acetate copolymer comprising from 3.3% to 4.1t vinyl acetate derived units, said ethylene vinyl acetate copolymer having a density of from centigrade or (b) a three component blend of (1) about 55%, by weight, or a linear low density polyethylene having a density of about 0.920 grams per cubic centimeter at 23 degrees centigrade, (2) about of (1) from 40% to 60%, by weight, of a linear low density polyethylene, (2) from 20% to 30%, by Height, of a linear medium density polyethylene, and (3) from 201 to 30%, by 0.9232 to 0.9250 grams per cubic centimeter at 23 degrees KJ .f'V ,30CT»87 - 60 - 28%, by weight of a linear medium density polyethylene having a density of about 0.935 grams per cubic centimeter at 23 degrees centigrade and (3) about 17X, by weight, of an ethylene vinyl acetate copolymer comprising from 3.3*6 to 4.1% vinyl acetate derived units, said ethylene vinyl acetate copolymer having a density of from 0.9232 to 0.9250 grams per cubic centimeter at 23 degrees centigrade; two cross-linked intermediate layers each consisting essentially of about 1002, by weight, of a linear low density polyethylene having a density of about 0.920 grams per cubic centimeter at 23 degrees centigrade; 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 degrees centigrade, (2) about 25%, by weight, of a linear medium density polyethylene having a density of about 0.935 grams per cubic centimeter at 23 degrees centigrade, and (3) about 25%, by weight, of an ethylene vinyl acetate copolymer comprising from 3.3% to 4.1% vinyl acetate derived units, said ethylene vinyl acetate copolymer having a density of from 0.9232 to 0.9253 grams per cubic centimeter at 23 degrees centigrade.

Claim 10

A film of claim 4 wherein said ethylene vinyl acetate copolymer of the core and surface layers comprises from 21 by weiqht, to 18% by weiqht, of vinyl acetate derived units. liVy s. *' 13 OCT 1987 - 61 -

Claim 11

A film of claim 4 wherein said vinyl acetate copolymer of the core and surface layers comprises from 2%, by weiqht, to 102, by weiqht, of vinyl acetate derived units.

Claim 12

The film of claim 4 wherein said ethylene vinyl acetate copolymer of the core and surface layers comprises from 2%, by weight, to 5X I • by weiqht, of vinyl acetate derived units.

Claim 13

A film of claim 4 or 6 further comprising a colorant additive to at least one of said layers.

Claim 14

A film of claim 4 or 6 further comprising a colorant additive solely in said core layer.

Claim 15

A film of claim 4 or 6 which has been cross-linked with from 1 MR to 5 MF of irradiation.

Claim 16

A film of claim 4 or 6 which has been cross-linked with from 2 MR to 4 MR of irradiation.

Claim 17

A. film of claim 4 or 6 which has been cross-linked with about 3 MR of irradiation.

Claim 18

A film of claim 4 or 6 which has been oriented by racking at a racking ratio of from 4.0 to 6.0 in both the longitudinal and transverse directions.

Claim 19

A film of claim 4- or 6 which has been oriented by racking / at a racking ratio of from 4.5 to 5.5 in both the longitu dinal and transverse directions. y ^ L i i> li (i 62 -

Claim 20

A film of claim 4 or 6 which has been oriented by racking at a racking ratio of about 5.0 in both the longitudinal and transverse directions.

Claim 21

A film of claim 4 or 6 wherein (a) the thicknesses of the two surface layers are substantially equal to each other and the sum of the thicknesses of the two surface layers comprise from 40% to 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 from 40% to 60% of the total thickness of the film, (A (c) the thickness of the core layer comprises from [I® the fil"1 thickness and (d), the total fi lm thickness is from 50 gauge to 200 gauge.

Claim 22

A film of claim 18 wherein the thickness of the core layer comprises about 14% of the total film thickness and the thickness of the two intermediate and the two surface layers each comprise about 21.5% of the total film thickness.

Claim 23

A film of any one of the preceding claims wherein the film is biaxially oriented in the range of 4.0 to 6.0 times the original dimensions in both the transverse and longitudinal di rections. storm window comprising: /-v ( *20CT!9$? V '-.V

Claim 24

An oriented five layer film suitablefor use as an exterior,^', - ... j Id L 1 t j h b - 63 - a cross-1 Inked core layer consisting essentially of either (a) about 100%, by weight, of an ethylene vinyl acetate copolymer t1 grade or (b) a three component blend of (1) about 55%, t»y weight, of a linear low density polyethylene having a density of about 0.920 grams per cubic centimeter at 23 degrees centigrade, (2) about 28%, by weight of a linear medium density polyethylene having a density of about 0.935 grams per cubic centimeter at 23 degrees centigrade and (3) about 17%, by weight, of an ethylene vinyl acetate copolymer comprising from 3.3% to 4.1% vinyl acetate derived units, said ethylene vinyl acetate copolymer having a density of from 0.9232 to 0.9250 grams per cubic centimeter at 23 degrees cen- 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 grains per cubic centimeter at 23 degrees centigrade; and two cross-linked surface layers each consisting essentially of a four 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 degrees centigrade, (2) about 25%, by weight, of a linear medium density polyethylene having a density of about 0.935 grams perc jV ^ comprising from 3.3% to 4.1% vinyl acetate derived units, said ethylene vinyl acetate copolymer having a density of from 0.9232 to 0.9250 grams per cubic centimeter at 23 degrees cen- ti grade; 'di 1 bb - 54 - cubic centimeter at 23 degrees centigrade, (3) about 25*, by weight, of an ethylene vinyl acetate copolymer comprising from 3.3£ to 4.It vinyl acetate derived units, said ethylene vinyl acetate copolymer having a density of from 0.9232 to 0.9250 grams per cubic centimeter at 23 degrees centigrade and (4) about 1,500 parts per million of at least one hindered amine ultraviolet light stabilizer.

Claim 25

An oriented five layer film suitablefor use as an exterior,^', - ... j Id L 1 t j h b - 63 - a cross-1 Inked core layer consisting essentially of either (a) about 100%, by weight, of an ethylene vinyl acetate copolymer t1 grade or (b) a three component blend of (1) about 55%, t»y weight, of a linear low density polyethylene having a density of about 0.920 grams per cubic centimeter at 23 degrees centigrade, (2) about 28%, by weight of a linear medium density polyethylene having a density of about 0.935 grams per cubic centimeter at 23 degrees centigrade and (3) about 17%, by weight, of an ethylene vinyl acetate copolymer comprising from 3.3% to 4.1% vinyl acetate derived units, said ethylene vinyl acetate copolymer having a density of from 0.9232 to 0.9250 grams per cubic centimeter at 23 degrees cen- 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 grains per cubic centimeter at 23 degrees centigrade; and two cross-linked surface layers each consisting essentially of a four 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 degrees centigrade, (2) about 25%, by weight, of a linear medium density polyethylene having a density of about 0.935 grams perc jV ^ comprising from 3.3% to 4.1% vinyl acetate derived units, said ethylene vinyl acetate copolymer having a density of from 0.9232 to 0.9250 grams per cubic centimeter at 23 degrees cen- ti grade; 'di 1 bb - 54 - cubic centimeter at 23 degrees centigrade, (3) about 25*, by weight, of an ethylene vinyl acetate copolymer comprising from 3.3£ to 4.It vinyl acetate derived units, said ethylene vinyl acetate copolymer having a density of from 0.9232 to 0.9250 grams per cubic centimeter at 23 degrees centigrade and (4) about 1,500 parts per million of at least one hindered amine ultraviolet light stabilizer.

Claim 26

A film of claim 2 comprising from 500 to 3,000 parts per million of said ultraviolet light stabilizer.

Claim 27

A film of claim 2 comprising 1,000 to 2,390 parts per million of said ultraviolet light stabilizer.

Claim 28

A film of claim 2 comprising about 1,590 parts per million of said ultraviolet light stabilizer.

Claim 29

A film of claim 5 wherein said ethylene vinyl acetate copolymer of the core and surface layers comprises from 2%, by weight to 18% by weiqht, of vinyl acetate derived units.

Claim 30

A film of claim 5 wherein said vinyl acetate copolymer of the core and surface layers comprises from 2%, by weight, to 10%, by weight, of vinyl acetate derived units.

Claim 31

A film of claim 5 wherein said ethylene vinyl acetate copolymer of the core and surface layers comprises from 2%, by weight, to ..... 5%, by weight of vinyl acetate derived units. r 2 ! - 65 -

Claim 32

A film of claim 5 comprising from 1,000 to 2,00® part per million of hindered amine ultraviolet light stabilizer.

Claim 33

A film of claim 5 comprising about 1,500 parts per million of hindered amine ultraviolet light stabilizer.

Claim 34

A film of claim 5 or 21 further comprising a colorant additive to at least one of said layers.

Claim 35

A film of claim 5 or 21 further comprising a colorant additive solely in said core layer.

Claim 36

A film of claim 5 or 21 which has been cross-linked with from 3 MR to 8 MR of irradiation.

Claim 37

A film of claim 5 or 21 which has been cross-linked with from 5 MR to 7 of irradiation.

Claim 38

A film of claim 5 or 21 which has been cross-linked with about 6 MR of irradiation.

Claim 39

A film of claim 5 or 21 which has been oriented by racking at a racking ratio of from 3.0 to 4.0 in both the longitudinal and transverse directions.

Claim 40

A film of claim 5 or 21 which has been oriented by racking at a racking ratio of from 3.0 to 3.5 in both the longitudinal and transverse directions. - r 13 0CTJ98?, .*» V Hjb6 - 66 -

Claim 41

a film of claim 5 or 21 which has been oriented by racking at a racking ratio of about 3.3 In both the longitudinal and transverse directions.

Claim 42

A film of claim 5 or 21 wherein (a) the thicknesses of the two surface layers are substantially equal to each other and the sum of the thicknesses of the two surface layers comprise from 40% to 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 from 40% to 60% of the total thickness of the film, (c) the thickness of the core layer comprises from 10% to 30% of the total film thickness and (d) the total film thickness is from 50 gauge to 200 gauge.

Claim 43

A film of claim 38 wherein the thickness of the core layer comprises about 14% of the total film thickness and the tliickness of the two intermediate and the two surface layers each comprise about 21.5% of the total film thickness.

Claim 44

A film as claimed in any one of the preceding claims substantially as hereinbefore described with reference to any example thereof and/or with reference to any of the accompanying drawings. Cy JJe/thair euthoriced Agerstc, A. J. PARK & SONt per .U/rvrviO,.