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US 6,607,823 B2Granted
Heat seal coating and coated film
AssigneeMitsubishi Polyester Film GmbH
InventorsRobert Giles Posey, Charles David Carlson, Jr., Jeffrey R. Rounsley
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Abstract
The present invention provides a coated polymer film having heat seal properties. The heat seal coating includes a propylene diol copolyester. Preferably, the copolyester is formed from 1,3-propane diol, isophthalic acid and a sulfomonomer. A method of heat sealing using this coated film is also disclosed.
Claims25
A coated polymer film comprising:
- a self-supporting polymer film layer, and
- a heat seal coating on said film layer, said heat seal coating consisting essentially of a copolyester formed of components including isophthalic acid, a sulfomonomer containing a sulfonate group attached to a dicarboxylic nucleus, and 1,3-propane diol.
A process for preparing a heat sealable film, said process comprising:
- coating a surface of a polymer film with a heat seal coating consisting essentially of a water-soluble copolyester binder, wherein said copolyester is formed of monomers including a 1,3-propane diol.
A method of forming a seal, comprising:
- placing a film having a heat seal coating thereon against a substrate, wherein said heat seal coating consists essentially of a 1,3-propane diol-based copolyester;
- applying heat to said film.
A method of laminating comprising the steps of
- i) providing a self-supporting polymer film, which film has a coating thereon, wherein said coating consists essentially of a copolyester including a sulfomonomer and a 1,3-propane diol.
- ii) extruding a molten resin onto said film.
Dependencies are inferred from the claim text.