US4447480A — Shrinkable film for poultry bags

Claim 1

Independent Claim 167 words

A heat-shrinkable film, suitable for use in fabricating bags for packaging frozen poultry, comprising a mixture of between about 80 and about 95 percent by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of from at least about 1.7 to about 4.5 percent by weight, based on the weight of said ethylene-vinyl acetate copolymer, and having a melt index of from at least about 0.15 to about 0.35 decigram per minute; and between about 5 and about 20 percent by weight, based on the weight of said film, of a polyethylene material selected from the group consisting of: (a) low pressure-high density polyethylene having a melt index of between about 0.15 and about 0.70 decigram per minute, and a density of between about 0.94 and about 0.96 gram per cubic centimeter, and (b) low pressure-low density polyethylene having a melt index of between about 0.3 and 3.0 decigrams per minute, and a density of between about 0.915 and about 0.925 gram per cubic centimeter.

Claim 2

Dependent Claim 167 words

A heat-shrinkable film, suitable for use in fabricating bags for packaging frozen poultry, comprising a mixture of between about 80 and about 95 percent by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of from at least about 1.7 to about 4.5 percent by weight, based on the weight of said ethylene-vinyl acetate copolymer, and having a melt index of from at least about 0.15 to about 0.35 decigram per minute; and between about 5 and about 20 percent by weight, based on the weight of said film, of a polyethylene material selected from the group consisting of: (a) low pressure-high density polyethylene having a melt index of between about 0.15 and about 0.70 decigram per minute, and a density of between about 0.94 and about 0.96 gram per cubic centimeter, and (b) low pressure-low density polyethylene having a melt index of between about 0.3 and 3.0 decigrams per minute, and a density of between about 0.915 and about 0.925 gram per cubic centimeter.

Claim 3

Dependent Claim 39 words

The film of claim 1 wherein said ethylene-vinyl acetate copolymer has a vinyl acetate content of between about 2.25 and about 3.0 percent by weight and a melt index of between about 0.2 and about 0.3 decigram per minute.

Claim 4

Dependent Claim 35 words

The film of claim 1 wherein said low pressure-low density polyethylene is a copolymer formed from ethylene and a comonomer selected from the group consisting of butene, pentene, hexene, heptene and octene, and mixtures thereof.

Claim 5

Dependent Claim 22 words

The film of claim 1 wherein said polyethylene material comprises between about 10 and about 15 percent by weight of the film.

Claim 6

Dependent Claim 22 words

The film of claim 3 wherein said copolymer has a melt index of between about 0.3 and about 3.0 decigrams per minute.

Claim 7

Dependent Claim 36 words

The film of claim 3 wherein said copolymer has a melt index of between about 0.5 and about 2.0 decigrams per minute, and a density of between about 0.915 and about 0.920 gram per cubic centimeter.

Claim 8

Dependent Claim 41 words

The film of claim 1 wherein said low pressure-low density polyethylene is a heterogeneous copolymer formed from ethylene, and at least one comonomer selected from the group consisting of propylene and butene-1, and at least one C 5 -C 8 comonomer.

Claim 9

Dependent Claim 36 words

The film of claim 7 wherein said copolymer has a density of between about 0.91 and about 0.94 gram per cubic centimeter, and a melt index of between about 0.3 and about 3.0 decigrams per minute.

Claim 10

Dependent Claim 36 words

The film of claim 7 wherein said copolymer has a melt index of between about 0.5 and about 2.0 decigrams per minute, and a density of between about 0.915 and about 0.925 gram per cubic centimeter.

Claim 11

Dependent Claim 39 words

The film of claim 1 wherein said low pressure-high density polyethylene has a melt index of between about 0.15 and about 0.3 decigram per minute, and a density of between about 0.945 and about 0.955 gram per cubic centimeter.

Claim 12

Dependent Claim 39 words

The film of claim 10 wherein said low pressure-low density polyethylene has a melt index of between about 0.5 and about 2.0 decigrams per minute, and a density of between about 0.915 and about 0.920 gram per cubic centimeter.

Claim 13

Dependent Claim 12 words

The film of claim 1 fabricated in the form of a bag.

Claim 14

Dependent Claim 157 words

A heat-shrinkable film suitable for use in fabricating bags for packaging frozen poultry, comprising a mixture of from about 85 to about 90 percent by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of between about 1.7 and about 4.5 percent by weight of said copolymer, and having a melt index of between about 0.15 and about 0.35 decigram per minute; and between about 10 and about 15 percent by weight, based on the weight of said film, of a polyethylene material selected from the group consisting of: (a) low pressure-high density polyethylene having a melt index of between about 0.15 and about 0.70 decigram per minute, and a density of between about 0.94 and about 0.96 gram per cubic centimeter, and (b) low pressure-low density polyethylene having a melt index of between about 0.3 and about 3.0 decigrams per minute, and a density of between about 0.915 and about 0.925 gram per minute.

Claim 15

Dependent Claim 157 words

A heat-shrinkable film suitable for use in fabricating bags for packaging frozen poultry, comprising a mixture of from about 85 to about 90 percent by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of between about 1.7 and about 4.5 percent by weight of said copolymer, and having a melt index of between about 0.15 and about 0.35 decigram per minute; and between about 10 and about 15 percent by weight, based on the weight of said film, of a polyethylene material selected from the group consisting of: (a) low pressure-high density polyethylene having a melt index of between about 0.15 and about 0.70 decigram per minute, and a density of between about 0.94 and about 0.96 gram per cubic centimeter, and (b) low pressure-low density polyethylene having a melt index of between about 0.3 and about 3.0 decigrams per minute, and a density of between about 0.915 and about 0.925 gram per minute.

Claim 16

Dependent Claim 18 words

The film of claim 13 wherein said ethylene-vinyl acetate copolymer has a melting point of about 106° C.

Claim 17

Dependent Claim 56 words

The film of claim 13 wherein said ethylene vinyl acetate copolymer has a vinyl acetate content of between about 2.25 to about 3.0 percent by weight, based on the weight of said copolymer, a melt index of between about 0.2 to about 0.3 decigram per minute, and a density of about 0.917 gram per cubic centimeter.

Claim 18

Dependent Claim 20 words

The film of claim 13 wherein said film has a thickness of from about 1.5 mils to about 2.75 mils.

Claim 19

Dependent Claim 12 words

The film of claim 13 fabricated in the form of a bag.

Claim 20

Dependent Claim 154 words

A resin mixture comprising between about 80 and about 95 percent by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of from at least about 1.7 to about 4.5 percent by weight, based on the weight of said ethylene-vinyl acetate copolymer, and having a melt index of from about 0.15 to about 0.35 decigram per minute; and between about 5 and about 20 percent by weight, based on the weight of said resin mixture, of a polyethylene material selected from the group consisting of: (a) low pressure-high density polyethylene having a melt index of between about 0.15 and about 0.70 decigram per minute, and a density of between about 0.94 and about 0.96 gram per cubic centimeter, and (b) low pressure-low density polyethylene having a melt index of between about 0.3 and about 3.0 decigrams per minute, and a density of between about 0.915 and about 0.925 gram per cubic centimeter.

Claim 21

Dependent Claim 154 words

A resin mixture comprising between about 80 and about 95 percent by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of from at least about 1.7 to about 4.5 percent by weight, based on the weight of said ethylene-vinyl acetate copolymer, and having a melt index of from about 0.15 to about 0.35 decigram per minute; and between about 5 and about 20 percent by weight, based on the weight of said resin mixture, of a polyethylene material selected from the group consisting of: (a) low pressure-high density polyethylene having a melt index of between about 0.15 and about 0.70 decigram per minute, and a density of between about 0.94 and about 0.96 gram per cubic centimeter, and (b) low pressure-low density polyethylene having a melt index of between about 0.3 and about 3.0 decigrams per minute, and a density of between about 0.915 and about 0.925 gram per cubic centimeter.

Claim 22

Dependent Claim 41 words

A resin mixture as in claim 18 wherein said ethylene-vinyl acetate copolymer has a vinyl acetate content of between about 2.25 and about 3.0 percent by weight and a melt index of between about 0.20 and about 0.30 decigram per minute.

Claim 23

Dependent Claim 37 words

A resin mixture as in claim 18 wherein said low pressure-low density polyethylene is a copolymer formed from ethylene and a comonomer selected from the group consisting of butene, pentene, hexene, heptene and octene, and mixtures thereof.

Claim 24

Dependent Claim 26 words

A resin mixture as claimed in claim 18 wherein said polyethylene material comprises between about 10 and about 15 percent by weight of said resin mixture.

Claim 25

Dependent Claim 24 words

A resin mixture as in claim 20 wherein said copolymer has a melt index of between about 0.3 and about 3.0 decigrams per minute.

Claim 26

Dependent Claim 38 words

A resin mixture as in claim 20 wherein said copolymer has a melt index of between about 0.5 and about 2.0 decigrams per minute, and a density of between about 0.915 and about 0.920 gram per cubic centimeter.

Claim 27

Dependent Claim 43 words

A resin mixture as in claim 18 wherein said low pressure-low density polyethylene is a heterogeneous copolymer formed from ethylene, and at least one comonomer selected from the group consisting of propylene and butene-1, and at least one C 5 -C 8 comonomer.

Claim 28

Dependent Claim 38 words

A resin mixture as in claim 18 wherein said copolymer has a density of between about 0.91 and about 0.94 gram per cubic centimeter and a melt index of between about 0.3 and about 3.0 decigrams per minute.

Claim 29

Dependent Claim 38 words

A resin mixture as in claim 24 wherein said copolymer has a melt index of between about 0.5 and about 2.0 decigrams per minute, and a density of between about 0.915 and about 0.925 gram per cubic centimeter.

Claim 30

Dependent Claim 41 words

A resin mixture as in claim 18 wherein said low pressure-high density polyethylene has a melt index of between about 0.15 and about 0.3 decigram per minute, and a density of between about 0.945 and about 0.955 gram per cubic centimeter.

Claim 31

Dependent Claim 41 words

A resin mixture as in claim 27 wherein said low pressure-low density polyethylene has a melt index of between about 0.5 and about 2.0 decigrams per minute, and a density of between about 0.915 and about 0.920 gram per cubic centimeter.

Claim 32

Dependent Claim 145 words

A resin mixture comprising from about 85 to 90 percent by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of between about 1.7 and about 4.5 percent by weight of said copolymer, and having a melt index of between about 0.15 and about 0.35 decigram per minute; and between about 10 and about 15 percent by weight, based on the weight of said resin mixture, of a polyethylene material selected from the group consisting of: (a) low pressure-high density polyethylene having a melt index of between about 0.15 and about 0.70 decigram per minute, and a density of between about 0.94 and about 0.96 gram per cubic centimeter, and (b) low pressure-low density polyethylene having a melt index of between about 0.3 and about 3.0 decigrams per minute, and a density of between about 0.915 and about 0.925 gram per cubic centimeter.

Claim 33

Dependent Claim 145 words

A resin mixture comprising from about 85 to 90 percent by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of between about 1.7 and about 4.5 percent by weight of said copolymer, and having a melt index of between about 0.15 and about 0.35 decigram per minute; and between about 10 and about 15 percent by weight, based on the weight of said resin mixture, of a polyethylene material selected from the group consisting of: (a) low pressure-high density polyethylene having a melt index of between about 0.15 and about 0.70 decigram per minute, and a density of between about 0.94 and about 0.96 gram per cubic centimeter, and (b) low pressure-low density polyethylene having a melt index of between about 0.3 and about 3.0 decigrams per minute, and a density of between about 0.915 and about 0.925 gram per cubic centimeter.

Claim 34

Dependent Claim 20 words

A resin mixture as in claim 29 wherein said ethylene-vinyl acetate copolymer has a melting point of about 106° C.

Claim 35

Dependent Claim 58 words

A resin mixture as in claim 29 wherein said ethylene vinyl acetate copolymer has a vinyl acetate content of between about 2.25 to about 3.0 percent by weight, based on the weight of said copolymer, a melt index of between about 0.20 to about 0.30 decigram per minute, and a density of about 0.917 gram per cubic centimeter.

Claim 36

Dependent Claim 30 words

A resin mixture as in claim 29 wherein said mixture is in the form of an extruded film havig a thickness of from about 1.5 mils to about 2.75 mils.

Claim 37

Dependent Claim 18 words

A resin mixture as in claim 32 wherein said film is fabricated in the form of a bag.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1987-05-08	1987-11-07	1988-05-08	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1991-05-08	1991-11-07	1992-05-08	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1995-05-08	1995-11-07	1996-05-08	$7700.00	Window Closed / Lapsed

Shrinkable film for poultry bags

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