Coextruded, hot-sealable and peelable polyester film,...

Details Coextruded, hot-sealable and peelable polyester film,... Coextruded, hot-sealable and peelable polyester film,...

2006-12-05

2006-12-05

Chen, Vivian (Department: 1773)

Stock material or miscellaneous articles

Structurally defined web or sheet

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

C428S334000, C428S336000, C428S346000, C428S347000, C428S349000, C428S3550RA, C428S323000, C525S165000, C525S173000, C525S174000, C525S177000, C525S437000, C525S444000, C528S302000, C528S308000, C528S308600, C528S308700, C264S288400, C264S290200

Reexamination Certificate

active

07144615

ABSTRACT:
This invention relates to a coextruded, transparent, biaxially oriented polyester film comprising a base layer (B) and a heatsealable top layer (A) which is peelable with respect to at least CPET. The heatsealable and peelable top layer (A) consists ofa) 70–97% by weight of polyester andb) 3–20% by weight of a polyester-incompatible polymer (=anti-PET polymer) based on the mass of the top layer (A), whereinc) the polyester is composed of 20–95 mol % of units derived from at least one aromatic dicarboxylic acid and 5–80 mol % of units derived from at least one aliphatic dicarboxylic acid, the sum of the dicarboxylic acid-derived molar percentages being 100, andd) the layer thickness of the top layer (A) dAis from 1.7 to 6.0 μm.The invention further relates to a process for producing the film and to its use.

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