Sealable, flame-resistant, co-extruded, biaxially oriented foil that is mat on one side and a method for producing and using same
AssigneeMitsubishi Polyester Film GmbH
InventorsUrsula Murschall, Ulrich Kern, Guenther Crass, Herbert Peiffer, Hans Mahl
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Abstract
The invention relates to a sealable, flame-retardant, coextruded, biaxially oriented polyester film with one matt side, and composed of at least one base layer B and of, applied to the two sides of this base layer, a sealable outer layer A and a matt outer layer C. The film also comprises at least one flame retardant. The invention further relates to the use of the film and to a process for its production.
Claims13
A sealable, flame-retardant, coextruded, biaxially oriented polyester film with one matt side and with at least one base layer B based on a thermoplastic polyester, and with a sealable outer layer A, and also with a matt outer layer C, where a flame retardant is present in at least one layer, characterized in that the sealable outer layer A has a minimum sealing temperature of 110° C. and a seal seam strength of at least 1.3 N/15 mm, and the topographies of the two outer layers A and C have the following features.
- Sealable outer layer A:
- Ra<30 nm
- Value measured for gas flow from 500 to 4000 s
- Non-sealable, matt outer layer C:
- 200 nm<Ra<1000 nm
- Value measured for gas flow <50 s.
A process for producing a sealable, flame-retardant, biaxially oriented polyester film with one matt side and with at least one polyester film with at least one base layer B based on a thermoplastic polyester, and with a sealable outer layer A, and also with a matt outer layer C, where at least one layer comprises a flame retardant which is added by way of masterbatch technology, and where the masterbatch has been precrystallized and/or predried, characterized in that melts corresponding to the individual layers of the film are coextruded through a flat-film die, the resultant film is drawn off on one or more rollers for solidification, and then the film is biaxially stretched (oriented) and the biaxially stretch film is heat-set.
Dependencies are inferred from the claim text.