Peelable polyester film with self-venting, process for its...

Details Peelable polyester film with self-venting, process for its... Peelable polyester film with self-venting, process for its...

2007-05-01

2007-05-01

Chen, Vivian (Department: 1773)

Stock material or miscellaneous articles

Hollow or container type article

Shrinkable or shrunk

C428S141000, C428S215000, C428S216000, C428S334000, C428S335000, C428S336000, C428S323000, C428S480000, C428S910000, C525S437000, C525S444000, C528S302000, C528S308000, C528S308600, C528S308700, C264S171160, C264S171190, C264S288400, C264S290200

Reexamination Certificate

active

10984920

ABSTRACT:
Coextruded, biaxially oriented polyester films which have a base layer (B) and have a heatsealable outer layer (A) that can be peeled from APET/CPET and from CPET, where the outer layer (A) includesa) from 80 to 98% by weight of polyester andb) from 2 to 10% by weight of inorganic and/or organic particles with a median diameter d50of from 3 to 12 μm,and wherec) the polyester is composed of from 12 to 89 mol % of units derived from at least one aromatic dicarboxylic acid and of from 11 to 88 mol % of units derived from at least one aliphatic dicarboxylic acid,andd) the ratio calculated from the particle size d50of the particles and the layer thickness dAof the outer layer (A) is greater than or equal to 1.5,and the shrinkage of the films, at least in one direction, is more than 5%. The films of the invention are especially suitable, owing to their property of self-venting, as a lid film for APET/CPET or CPET trays.

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