Peelable polyester film having improved oxygen barrier,...

Details Peelable polyester film having improved oxygen barrier,... Peelable polyester film having improved oxygen barrier,...

2007-04-17

2007-04-17

Chen, Vivian (Department: 1773)

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

C428S323000, C428S215000, C428S216000, C428S334000, C428S335000, C428S336000, C428S474400, C428S475200, C428S475500, C428S480000, C428S910000, C525S420000, C525S425000, C528S302000, C528S308000, C528S308600, C528S308700, C264S171160, C264S171190, C264S288400, C264S290200

Reexamination Certificate

active

10984921

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) comprisesfrom 80 to 99% by weight of polyester andfrom 1 to 10% by weight of inorganic and/or organic particles with a median diameter d50of from 2.5 to 12 μm, and wherethe polyester is composed offrom 12 to 89 mol % of units derived from at least one aromatic dicarboxylic acid and offrom 11 to 88 mol % of units derived from at least one aliphatic dicarboxylic acid,and the ratio calculated from the particle size d50of the particles and the layer thickness dAof the outer layer (A) is ≧1, and the base layer (B) comprises poly(-xyleneadipamide). The films of the invention are suitable, owing to their increased oxygen barrier, as a packaging material for foods and other consumable goods or as a lid film for APET/CPET or CPET trays.

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