Oriented mutilayer film having core of cross-linked lldpe; storm windows therefrom

Claim 2

An oriented multilayer film comprising: a cross-linked core layer comprising a linear low density polyethylene; and two cross-linked surface layers each comprising a four 5 component blend of (1) a linear low density polyethylene, (2) a linear medium density polyethylene, (3) an ethylene-vinyl acetate copolymer and (4) at least one ultraviolet light stabilizer.

Claim 3

An oriented three layer film useful , as a storm window comprising: 10 a cross-linked core layer comprising a linear low density polyethylene; two cross-linked surface layers each comprising a four component blend of (1) from \ 40% to 60%, by weight, of a linear low density polyethylene, (2) from 20% to 30%, by 15 weight, of a linear medium density polyethylene, (3) from \ 20% to \30%, by weight, of an ethylene-vinyl acetate copolymer and (4) from 1500 ppm to 3,000 ppm of at least one hindered amine ultravio let light stabilizer.

Claim 4

An oriented three layer film useful , as a storm window comprising: 10 a cross-linked core layer comprising a linear low density polyethylene; two cross-linked surface layers each comprising a four component blend of (1) from \ 40% to 60%, by weight, of a linear low density polyethylene, (2) from 20% to 30%, by 15 weight, of a linear medium density polyethylene, (3) from \ 20% to \30%, by weight, of an ethylene-vinyl acetate copolymer and (4) from 1500 ppm to 3,000 ppm of at least one hindered amine ultravio let light stabilizer.

Claim 5

An oriented three layer film useful \ as a storm 20 window comprising: a cross-linked core layer consisting essentially of a linear low density polyethylene having a density of about 0.920 grams per cubic centimeter; and two cross-linked surface layers each consisting essen- §) 25 tially 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, (2) about 25%, by weight, of a linear medium density.polyeth-' ylene having a density of about 0.935 grams per cubic centimeter, (3) •o\* »0 AUG 1987^ _3,_ 211770 about 25%, by weight, of an ethylene-vinyl acetate copolymer comprising r from 3.3% to 4.1% by weight vinyl jacetate derived units, said copolymer having a density of from 0.9232 to J 0.9250 grams per cubic centimeter and (4) about 1,500 parts per million of a hindered amine 5 ultraviolet light stabilizer.

Claim 6

An oriented three layer film useful \ as a storm 20 window comprising: a cross-linked core layer consisting essentially of a linear low density polyethylene having a density of about 0.920 grams per cubic centimeter; and two cross-linked surface layers each consisting essen- §) 25 tially 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, (2) about 25%, by weight, of a linear medium density.polyeth-' ylene having a density of about 0.935 grams per cubic centimeter, (3) •o\* »0 AUG 1987^ _3,_ 211770 about 25%, by weight, of an ethylene-vinyl acetate copolymer comprising r from 3.3% to 4.1% by weight vinyl jacetate derived units, said copolymer having a density of from 0.9232 to J 0.9250 grams per cubic centimeter and (4) about 1,500 parts per million of a hindered amine 5 ultraviolet light stabilizer.

Claim 7

The film of claim 1 comprising from I 500 to 1 3,000 parts per million of said ultraviolet light stabilizer.

Claim 8

The film of claim 1 comprising _ i 1,000 to 2,000 parts per million of said ultraviolet light stabilizer. 10

Claim 9

The film of claim 1 comprising about 1,500 parts per million of said ultraviolet light stabilizer.

Claim 10

The film of claim 2 wherein said ethylene-vinyl acetate copolymer comprises from 2%, by weight, to 18%, by weight, of iP&S vinyl acetate derived units. ......

Claim 11

Sr-r? 'i/Jff 15 "8. The film of claim 2 wherein said ethylene-vinyl acetate copolymer comprises from j2%, by weight, to ./10%, by weight, of vinyl acetate derived units.

Claim 12

The film of claim 2 wherein said ethylene-vinyl acetate copolymer comprises from 2%, by weight, to 15%, by weight, of 20 vinyl acetate derived units.

Claim 13

The film of claim 2 comprising from 11,000 to 2,000 parts per million of hindered amine ultraviolet light stabilizer.

Claim 14

The film of claim 2 comprising about 1,500 parts per million of hindered amine ultraviolet light stabilizer- | 25

Claim 15

The film of claim 2 or 3 further comprising ^a colorant additive to at least one of said layers.

Claim 16

The film of claim. 2 or 3 -further comprising a ,^olorant additive solely in said core layer. • =40- 4/041184/1/40 Zf • > f: 211770

Claim 17

The film of claim 2 or 3 which has been cross-linked with from -about 4 MR to afeotrt 8 MR of irradiation.

Claim 18

The film of claim 2 or 3 which has been cross-linked with from 5 MR to 7 MR of irradiation. 5

Claim 19

The film of claim 2 or 3 which has been cross-linked with about 6 MR of irradiation.

Claim 20

The film of claim 2 or 3 which has been oriented by racking at a racking ratio of from 3.0 to 4.0 in both the longitudinal and transverse directions. 10

Claim 21

The film of claim 2 or 3 which has been oriented by racking at a racking ratio of from 3.0 to 3.5 in both the longitudinal and transverse directions.

Claim 22

The film of claim 2 or 3 which have been oriented by racking at a racking ratio of about 3.3 in both the longitudinal .-and 15 transverse directions.

Claim 23

The film of claiir 2 or 3 which has an average longitudinal elongation at break and 73°F of about 221% and an average transverse elongation at break and 73°F of about 226%.

Claim 24

The film of claiir 2 or 3 which has an average longitudinal elongation at break and 73°F of about 221% and an average transverse elongation at break and 73°F of about 226%.

Claim 25

The film of claim 2 or 3 which has an average longitudi- 20 nal tear propagation at 73°F of about 29.13 and an average transverse tear propagation at 73°F of about 30.38.

Claim 26

The film of claim, 2 or 3 which has an average ball burst impact at 73°F, 1.00 inch diameter sphere head of about 37.3 centimeters x killograms. 4 4/041184/1/41 t1' 21 1770

Claim 27

An oriented multilayer film as claimed in any one of the preceding claims substantially as hereinbefore described with reference to any example thereof and/or the accompanying drawings. J DATED THIS DAY OF 19^S A. J. PARK & SON PEP, ytf-Ls# JocJ AGENTS FOR THE APPLICANTS C/o • /£ . . - 42 -