Heat sealable polyvinyl chloride films
View Patent ↗A heat sealable film for use in food packaging comprises a resin composition comprising vinyl chloride homopolymer, vinyl chloride-vinyl acetate copolymer and plasticizer in an amount greater than about 15% by weight of the resin composition. In one embodiment, the film is adapted to provide a controlled oxygen transmission of at least 500 cc/in2/24 hours. The embodiment is also adapted to heat seal on conventional packaging equipment.
1. A heat sealable film for use in food packaging comprising a film formed from a resin composition comprising: a blend of polyvinyl chloride; copolymer of vinyl chloride and vinyl acetate; and plasticizer in an amount greater than about 15% by weight of the resin composition;
wherein the film is adapted to heat seal to itself; and
wherein the film is biaxially oriented and heat shrinks in an amount less than 80% of its original length at about 195° F.
2. The heat sealable film of claim 1 , wherein the plasticizer is present in an amount greater than about 20% by weight of the resin composition.
3. The heat sealable film of claim 1 , wherein the plasticizer is present in an amount ranging from about 15% to about 40% by weight of the resin composition.
4. The heat sealable film of claim 1 , wherein the plasticizer is present in an amount ranging from about 15% to about 30% by weight of the resin composition.
5. The heat sealable film of claim 1 , wherein the film comprises copolymer of vinyl chloride and vinyl acetate in an amount ranging from about 1% to about 30% by weight of the resin composition.
6. The heat sealable film of claim 1 , wherein the film comprises copolymer of vinyl chloride and vinyl acetate in an amount ranging from about 5% to about 20% by weight of the resin composition.
7. The heat sealable film of claim 1 , wherein the film comprises copolymer of vinyl chloride and vinyl acetate in an amount ranging from about 10% to about 20% by weight of the resin composition.
8. The heat sealable film of claim 1 , wherein the film comprises copolymer of vinyl chloride and vinyl acetate in an amount ranging from about 15% to about 20% by weight of the resin composition.
9. The heat sealable film of claim 1 , wherein the film is oriented biaxially in an amount ranging from about 50% to about 400% of its original length in the machine direction and in the transverse direction.
10. The heat sealable film of claim 1 , wherein the film has a heat sealing window of at least 20° F.
11. The heat sealable film of claim 1 , wherein the film has a heat sealing window of at least 30° F.
12. The heat sealable film of claim 1 , wherein the film is an irradiated film having crosslinked polymers.
13. The heat sealable film of claim 1 , wherein the film has an oxygen transmission rate of about 150 to about 1200 g/100 in 2 /24 hours.
14. The heat sealable film of claim 1 , wherein the film comprises slip in an amount ranging from about 0.05% to about 0.6% by weight of the resin composition.
15. The heat sealable film of claim 1 , wherein the film comprises slip in an amount ranging from about 0.01% to about 0.6% by weight of the resin composition.
16. A heat sealable film for use in food packaging comprising a film formed from a resin composition comprising: a blend of polyvinyl chloride; copolymer of vinyl chloride and vinyl acetate; and plasticizer in an amount greater than about 15% by weight of the resin composition;
wherein the film is adapted to heat seal to itself; and
wherein the film is oriented and heat shrinks in an amount less than 60% of its original length at about 195° F.