Polymeric composition of matter, oriented polymeric films and shrink bags made therefrom

Claim 2

An oriented multiple layer polymeric film, comprising a first, barrier layer having second and third layers each adhered to a respective one of the opposite surfaces of the first layer and two further layers one being a blend of linear low density polyethylene and ethylene vinyl acetate, characterised in that the second and third layers both have essentially the same composition, the fourth layer is adhered to one of the second and third layers and the fifth layer is adhered to the fourth layer, and further characterised in that the second, third and fifth layers each comprise an ethylene vinyl acetate, while the fourth layer comprises a blend of 10% to less than 20% or more than 80 up to 90% by weight linear low density polyethylene and the balance is ethylene vinyl acetate.

Claim 3

An oriented multiple layer polymeric film, comprising a first, barrier layer having second and third layers each adhered to a respective one of the opposite surfaces of the first layer, and two further layers one being a blend of linear low density polyethylene (LLDPE) and ethylene vinyl acetate, characterised in that the second and third layers have essentially the same composition and comprise an EVA, the fourth layer is adhered to one of the second and third layers and comprises the said blend which is 10% to less than 20% or more than 80% up to 90% by weight LLDPE and the balance is EVA, and the fifth layer is LLDPE or an EVA.

Claim 4

An oriented multiple layer polymeric film, comprising a first, barrier layer having second and third layers each adhered to a respective one of the opposite surfaces of the first layer, and two further layers one being a blend of linear low density polyethylene (LLDPE) and ethylene vinyl acetate, characterised in that the second and third layers have essentially the same composition and comprise an EVA, the fourth layer is adhered to one of the second and third layers and comprises the said blend which is 10% to less than 20% or more than 80% up to 90% by weight LLDPE and the balance is EVA, and the fifth layer is LLDPE or an EVA.

Claim 5

An oriented multiple layer polymeric film, consisting of a first barrier layer having second and third layers each adhered to a respective one of the opposite surfaces of the first layer, and fourth and fifth layers respectively adhered to surfaces of the second and third layers not adhered to the first layer, the fourth and fifth layers each being a blend of linear low density polyethylene (LLDPE) and ethylene vinyl acetate (EVA) and each of the second and third layers being an EVA, the fourth and fifth layers having the same composition and being composed of 10 to less than 20% or more than 80 up to 90% LLDPE and the balance being EVA; the percentages quoted being by weight.

Claim 6

An oriented multiple layer polymeric film, consisting of a first barrier layer having second and third layers each adhered to a respective one of the opposite surfaces of the first layer, and fourth and fifth layers respectively adhered to surfaces of the second and third layers not adhered to the first layer, the fourth and fifth layers each being a blend of linear low density polyethylene (LLDPE) and ethylene vinyl acetate (EVA) and each of the second and third layers being an EVA, the fourth and fifth layers having the same composition and being composed of 10 to less than 20% or more than 80 up to 90% LLDPE and the balance being EVA; the percentages quoted being by weight.

Claim 7

An oriented multiple layer polymeric film, consisting of a first barrier layer having second and third layers each adhered to a respective one of the opposite surfaces of the first layer, and fourth and fifth layers respectively adhered to surfaces of the second and third layers not adhered to the first layer, the fourth and fifth layers each being a blend of linear low density polyethylene (LLDPE) and ethylene vinyl acetate (EVA) and each of the second and third layers being an EVA, the fourth and fifth layers having different compositions, one of these layers being composed of 10 to less than 20% or more than 80 up to 90% LLDPE, the balance being EVA, and the other of these layers being composed of more than 10 up to 90% LLDPE, the balance being EVA; the percentages quoted being by weight.

Claim 8

An oriented multiple layer polymeric film, consisting of a first barrier layer having second and third layers each adhered to a respective one of the opposite surfaces of the first layer, and fourth and fifth layers respectively adhered to surfaces of the second and third layers not adhered to the first layer, the fourth and fifth layers each being a blend of linear low density polyethylene (LLDPE) and ethylene vinyl acetate (EVA) and each of the second and third layers being an EVA, the fourth and fifth layers having different compositions, one of these layers being composed of 10 to less than 20% or more than 80 up to 90% LLDPE, the balance being EVA, and the other of these layers being composed of more than 10 up to 90% LLDPE, the balance being EVA; the percentages quoted being by weight.

Claim 9

An oriented multiple layer polymeric film, comprising a first, barrier layer having second and third layers each adhered to a respective one of the opposite surfaces of the first layer, characterised in that the second and third layers both have essentially the same composition, a fourth layer is adhered to one of the second and third layers and a fifth layer is adhered to the fourth layer, and further characterised in that the second, third and fifth layers comprise ethylene vinyl acetate, while the fourth layer comprises 10% to 100% by weight linear low density polyethylene.

Claim 10

An oriented multiple layer polymeric film, comprising a first, barrier layer having second and third layers each adhered to a respective one of the opposite surfaces of the first layer, characterised in that the second and third layers both have essentially the same composition, a fourth layer is adhered to one of the second and third layers and a fifth layer is adhered to the fourth layer, and further characterised in that the second, third and fifth layers comprise ethylene vinyl acetate, while the fourth layer comprises 10% to 100% by weight linear low density polyethylene.

Claim 11

An oriented multiple layer polymeric film comprising a first, barrier layer having second and third layers each adhered to a respective one of the opposite surfaces of the first layer, with fourth and fifth layers adhered to the second and third layers on the respective surfaces of the latter layers opposite the first layer, characterised in that the second and third layers have essentially the same composition and comprise a first pair of layers; the fourth and fifth layers have essentially the same composition and comprise a second pair of layers, and further characterised in that in the combined composition of the first and second pairs of layers, at least one of the pairs comprises at least 50% by weight of an ethylene vinyl acetate component, the remainder of that pair being a linear low density polyethylene; and at least one of the said pairs comprises at least 10% by weight of a linear low density polyethylene component, the remainder of that pair being ethylene vinyl acetate, the requirement for the presence of at least 50% of the ethylene vinyl acetate component and for at least 10% of the linear low density polyethylene component being met by each of the said pairs having a respective one of the components.

Claim 12

An oriented multiple layer polymeric film comprising a first, barrier layer having second and third layers each adhered to a respective one of the opposite surfaces of the first layer, with fourth and fifth layers adhered to the second and third layers on the respective surfaces of the latter layers opposite the first layer, characterised in that the second and third layers have essentially the same composition and comprise a first pair of layers; the fourth and fifth layers have essentially the same composition and comprise a second pair of layers, and further characterised in that in the combined composition of the first and second pairs of layers, at least one of the pairs comprises at least 50% by weight of an ethylene vinyl acetate component, the remainder of that pair being a linear low density polyethylene; and at least one of the said pairs comprises at least 10% by weight of a linear low density polyethylene component, the remainder of that pair being ethylene vinyl acetate, the requirement for the presence of at least 50% of the ethylene vinyl acetate component and for at least 10% of the linear low density polyethylene component being met by each of the said pairs having a respective one of the components.

Claim 13

An oriented film according to claim 6, characterised in that the said first pair of layers comprises 70% to 100% by weight of ethylene vinyl acetate and the second pair of layers comprises 10% to 90% by weight of linear low density polyethylene, for example the first pair of layers comprises 100% ethylene vinyl acetate and the second pair of layers comprises at least 50% linear low density polyethylene by weight.

Claim 14

An oriented film according to claim 6, characterised in that the first pair of layers comprises 50% to 100% by weight of linear low density polyethylene and the second pair of layers comprises 50% to 100% by weight of ethylene vinyl acetate, for example the first pair of layers comprises at least 90% by weight of linear low density polyethylene and the second pair of layers comprises at least 90% by weight of ethylene vinyl acetate.

Claim 15

An oriented film according to any of claims 1 to 8, characterised in that the said barrier layer is selected from polyvinyl chloride-polyvinylidene chloride copolymer, ethylene vinyl alcohol copolymer and polymeric blends containing ethylene vinyl alcohol copolymer.

Claim 16

An oriented film according to any of claims 1 to 9, characterised in that the overall composition of the film comprises 20% to 30% linear low density polyethylene.

Claim 17

A shrink bag made from an oriented film according to any of claims 1 to 10, for example which comprises an extruded tubular article having one end closed by a heat seal and the other end open for filling the bag, said other end being closeable after filling by heat sealing.

Claim 18

A multi-layer film or bag comprising a film, which includes a barrier layer and at least one layer comprising a blend of linear low density polyethylene and ethylene vinyl acetate, the film optionally being oriented.

Claim 19

A multi-layer film or bag comprising a film, which includes a barrier layer and at least one layer comprising a blend of linear low density polyethylene and ethylene vinyl acetate, the film optionally being oriented.

Claim 20

A film or bag according to claim 12, wherein the blend comprises 10% to 90% by weight linear low density polyethylene and 90% to 10% ethylene vinyl acetate.

Claim 21

A polymeric composition of matter comprising a blend characterised by 10% to 90% linear low density polyethylene and 90% to 10% ethylene vinyl acetate, the percentages being by weight.

Claim 22

A polymeric composition of matter comprising a blend characterised by 10% to 90% linear low density polyethylene and 90% to 10% ethylene vinyl acetate, the percentages being by weight.

Claim 23

An oriented polymeric film characterised by comprising a blend according to claim 14.

Claim 24

An oriented film according to claim 15, wherein the blend composition comprises 20% to 30% by weight of linear low density polyethylene.