Food wrap having low oxygen permeability and desirable elastic properties

Claim 2

AN ELASTIC FILM AN OXYGEN PERMEABILITY OF LESS THAN 30 CUBIC DENTIMETERS:MIL/100 SQUARE INCHES/24 HOURS/ATMOS PHERIC, AS DETERMINED BY THE TEST PROCEDURE OF ASTM-143466, AND PERMANENT DEFORMATION OF LESS THAN 10 PER CENT WHEN STRETCHED TO 50 PER CENT ELONGATION AT 40*F., SAID ELASTIC FILM CONSISTING ESSENTIALLY TO (A) A THERMOPLASTIC URETHANE POLYMER HAVING A DUROMETER A HARDNESS OF FROM ABOUT 60 TO ABOUT 100, AND (B) A VINYLIDENE CHLORIDE POLYMER, SAID VINYLIDENE CHLORIDE POLYMER BEING COMPOUND OF FROM 50 TO 95 WEIGHT PER CENT POLYMERIZED VINYLIDENE CHLORIDE, THE REMAINDER OF SAID VINYLIDENE CHLORIDE POLYMER BEING AT LEAST ONE POLYMERIZED MONOMER SELECTED FROM THE GROUP CONSISTING OF VINYL CHLORIDE, ALKYL ACRYLATE, ALKYL METHACRYLATE, AND ACRYLONTRILE; WHEREIN WHEN SAID THERMOPLASTIC URETHANE POLYMER HAS A DUROMETER A HARDNESS OF FROM ABOUT 90 TO ABOUT 100, THE PROPORTION OF SAID THERMOPLASTIC URETHANE POLYMER IN SAID ELASTIC FILM IS FROM ABOUT 65 TO ABOUT 95 WEIGHT PER CENT; WHEREIN WHEN SAID THERMOPLASTIC URETHANE POLYMER HAS A DUROMETER A HARDNESS OF FROM ABOUT 70 TO ABOUT 90, THE PROPORTION OF SAID THERMOPLASTIC URETHANE POLYMER IN SAID ELASTIC FILM IS FROM ABOUT 35 TO ABOUT 65 WEIGHT PER CENT; AND WHEREIN WHEN SAID THERMOPLASTIC URETHANE POLYMER HAS A DUROMETER A HARDNESS OF FROM ABOUT 60 TO ABOUT 70, THE PROPORTION OF SAID THERMOPLASTIC URETHANE POLYMER IN SAID ELASTIC FILM IS FROM ABOUT 15 TO ABOUT 45 WEIGHT PER CENT.

Claim 3

An elastic film having an oxygen permeability of less than 30 cubic centimeters-mil/100 square inches/24 hours/atmosphere, as determined by the test procedure of ASTM-1434-66, and permanent deformation of less than 10 per cent when stretched to 50 per cent elongation at 40*F., said elastic film consisting essentially of (a) a thermoplastic urethane polymer having a Durometer A hardness of from about 60 to about 100, and (b) a vinylidene chloride polymer, said vinylidene chloride polymer being composed of from 50 to 95 weight per cent polymerized vinylidene chloride, the remainder of said vinylidene chloride polymer being at least one polymerized monomer selected from the group consisting of vinyl chloride, alkyl acrylate, alkyl methacrylate, and acrylonitrile; wherein when said thermoplastic urethane polymer has a Durometer A hardness of from about 90 to about 100, the proportion of said thermoplastic urethane polymer in said elastic film is from about 65 to about 95 weight per cent; wherein when said thermoplastic urethane polymer has a Durometer A hardness of from about 70 to about 90, the proportion of said thermoplastic urethane polymer in said elastic film is from about 35 to about 65 weight per cent; and wherein when said thermoplastic urethane polymer has a Durometer A hardness of from about 60 to about 70, the proportion of said thermoplastic urethane polymer in said elastic film is from about 15 to about 45 weight per cent.

Claim 4

An elastic film having an oxygen permeability of less than 30 cubic centimeters-mil/100 square inches/24 hours/atmosphere, as determined by the test procedure of ASTM-1434-66, and permanent deformation of less than 10 per cent when stretched to 50 per cent elongation at 40*F., said elastic film consisting essentially of (a) a thermoplastic urethane polymer having a Durometer A hardness of from about 60 to about 100, and (b) a vinylidene chloride polymer, said vinylidene chloride polymer being composed of from 50 to 95 weight per cent polymerized vinylidene chloride, the remainder of said vinylidene chloride polymer being at least one polymerized monomer selected from the group consisting of vinyl chloride, alkyl acrylate, alkyl methacrylate, and acrylonitrile; wherein when said thermoplastic urethane polymer has a Durometer A hardness of from about 90 to about 100, the proportion of said thermoplastic urethane polymer in said elastic film is from about 65 to about 95 weight per cent; wherein when said thermoplastic urethane polymer has a Durometer A hardness of from about 70 to about 90, the proportion of said thermoplastic urethane polymer in said elastic film is from about 35 to about 65 weight per cent; and wherein when said thermoplastic urethane polymer has a Durometer A hardness of from about 60 to about 70, the proportion of said thermoplastic urethane polymer in said elastic film is from about 15 to about 45 weight per cent.

Claim 5

The elastic film of claim 1 wherein said remainder of said vinylidene chloride polymer includes polymerized vinyl chloride.

Claim 6

The elastic film of claim 1 wherein said vinylidene chloride polymer has an oxygen permeability of less than about 40 cubic centimeters-mil/100 square inches/24 hours/atmosphere, as determined by the test procedure of ASTM 1434-66, when formed into a film consisitng essentially of 92 weight percent of said vinylidene chloride polymer and 8 weight percent of dibutyl sebacate.

Claim 7

The elastic film of claim 1 wherein said vinylidene chloride polymer has an oxygen permeability of less than about 30 cubic centimeters-mil/100 square inches/24 hours/atmosphere, as determined by the test procedure of ASTM-1434-66, when formed into a film consisting essentially of 92 weight percent of said vinylidene chloride polymer and 8 weight percent of dibutyl sebacate.

Claim 8

The elastic film of claim 2 wherein said vinylidene chloride polymer has an oxygen permeability of less than about 30 cubic centimeters-mil/100 square inches/24 hours/atmosphere, as determined by the test procedure of ASTM-1434-66, when formed into a film consisting essentially of 92 weight per cent of said vinylidene chloride polymer and 8 weight per cent of dibutyl sebacate.

Claim 9

The elastic film of claim 1 wherein the thermoplastic urethane polymer comprises the reaction product of (a) a polyester of a dihydric alcohol and a dicarboxylic acid, and (b) an organic diisocyanate.

Claim 10

The elastic film of claim 2 wherein the thermoplastic urethane polymer comprises the reaction product of (a) a polyester of dihydric alcohol and a dicarboxylic acid, and (b) an organic diisocyanate.

Claim 11

The elastic film of claim 3 wherein the thermoplastic urethane polymer comprises the reaction product of (a) a polyester of a dihydric alcohol and a dicarboxylic acid, and (b) an organic diisocyanate.

Claim 12

The elastic film of claiim 4 wherein the thermoplastic urethane polymer comprises the reaction product of (a) a polyester of a dihydric alcohol and a dicarboxylic acid, and (b) an organic diisocyanate.

Claim 13

The elastic film of claiim 4 wherein the thermoplastic urethane polymer comprises the reaction product of (a) a polyester of a dihydric alcohol and a dicarboxylic acid, and (b) an organic diisocyanate.

Claim 14

The elastic film of claim 5 wherein the thermoplastic urethane polymer comprises the reaction product of (a) a polyester of a dihydric alcohol and a dicarboxylic acid, and (b) an organic diisocyanate.

Claim 15

The elastic film of claim 1 wherein the thermoplastic urethane polymer comprises the reaction product of bis(4-isocyanatophenyl)methane, 1,4-butanediol, and a polyester of adipic acid and ethylene glycol.

Claim 16

The elastic film of claim 2 wherein the thermoplastic urethane polymer comprises the reaction product of bis(4-isocyanatophenyl)methane, 1,4-butanediol and a polyester of adipic acid and ethylene glycol.

Claim 17

The elastic film of claim 3 wherein the thermoplastic urethane polymer comprises the reaction product of bis(4-isocyanatophenyl)methane, 1,4-butanediol, and a polyester of adipic acid and ethylene glycol.

Claim 18

The elastic film of claim 4 wherein the thermoplastic urethane polymer comprises the reaction product of bis(4-isocyanatophenyl)methane, 1,4-butanediol, and a polyester of adipic acid and ethylene glycol.

Claim 19

The elastic film of claim 5 wherein the thermoplastic urethane polymer comprises the reaction product of bis(4-isocyanatophenyl)methane, 1,4-butanediol, and a polyester of adipic acid and ethylene glycol.

Claim 20

A bag fabricated from the film of claim 1.