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Heat-sealable polyester film
| Details |
Inventors: Peiffer, Herbert; Bennett, Cynthia; Roth, Werner; Fritsch, Karsten;
Assignee: Hoechst Diafoil GmbH (Wiesbaden, DE)
Primary Examiner: Chen; Vivian
Assistant Examiner:
Attorney, Agent or Firm:
The invention relates to a coextruded heat-sealable polyester film having at least one base layer and at least one heat-sealable outer layer, wherein this heat-sealable outer layer comprises a copolymer which contains from 5 to 95% by weight of ethylene 2,6-naphthalate units. |
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DETAILED DESCRIPTION What is claimed is: 1.
A coextruded heat-sealable polyester film having at least one polyester base layer and at least one heat-sealable outer layer, wherein said heat-sealable outer layer comprises a copolymer which contains from 5 to 95% by weight of ethylene 2,6-naphthalate units.
2.
A polyester film as claimed in claim 1, wherein said heat-sealable outer layer(s) contain(s) from 10 to 90% by weight of polyethylene 2,6-naphthalate copolymer.
3.
A polyester film as claimed in claim 1, wherein the glass transition temperature of the polymer of the heat-sealable outer layer is at least 2.
degree.
C.
higher than the glass transition temperature of the polyester of the base layer.
4.
A polyester film as claimed in claim 1, wherein the film has a sealing initiation temperature of below 120.
degree.
C.
5.
A polyester film as claimed in claim 1, wherein the heat-sealable outer layer is arranged on both sides of the base layer.
6.
A polyester film as claimed in claim 1, wherein the heat-sealable layer has a thickness of from 0.
2 to 5 .
mu.
m.
7.
A polyester film as claimed in claim 1, wherein a non-heat-sealable outer layer is located on one side of the base layer.
8.
A polyester film as claimed in claim 1, wherein the copolymer of the heat-sealable outer layer contains ethylene terephthalate units.
9.
A polyester film as claimed in claim 1, wherein the copolymer of the heat-sealable outer layer comprises predominantly ethylene 2,6-naphthalate units and ethylene terephthalate units.
10.
A polyester film as claimed in claim 9, wherein the weight ratio of ethylene 2,6-naphthalate units to ethylene terephthalate units is from 5:95 to 95:5.
11.
A polyester film as claimed in claim 1, wherein the film has been coated in-line.
12.
A polyester film as claimed in claim 1, wherein the film has been corona-treated.
13.
A polyester film as claimed in claim 1, wherein the film has been metallized.
14.
A polyester film as claimed in claim 1, wherein the film has been printed.
15.
A process for producing a heat-sealable polyester film as claimed in claim 1, which comprises coextruding at least one copolymer containing polyethylene 2,6-naphthalate and a polyester through a flat film die onto a chill roll, where they are cooled, and then monoaxially or biaxially orienting the resultant semifinished film, after which the film is heat-set and finally wound up
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Nonmetallic Processes 
