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

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

2004-09-29

2008-10-28

Chen, Vivian (Department: 1794)

Stock material or miscellaneous articles

Structurally defined web or sheet

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

C428S215000, C428S216000, C428S335000, C428S336000, C428S323000, C428S347000, C428S349000, C428S3550RA, C428S480000, C428S910000, C525S437000, C525S444000, C528S302000, C528S308000, C528S308600, C528S308700, C264S171160, C264S171190, C264S288400, C264S290200

Reexamination Certificate

active

07442427

ABSTRACT:
This invention relates to coextruded, transparent, biaxially oriented polyester film comprising a base layer (B) and a heatsealable top layer (A) which is peelable from at least APET, the heatsealable and peelable top layer (A) consisting ofa) 80-98% by weight of polyester andb) 2-10% by weight of inorganic and/or organic particles having an average diameter d50of from 2.5 to 8.0 μm (based on the mass of the top layer (A)),whereinc) the polyester being composed of 12-89 mol % of units which derive from at least one aromatic dicarboxylic acid and 11-88 mol % of units which derive from at least one aliphatic dicarboxylic acid, the sum of the dicarboxylic acid-derived molar percentages being 100,d) the ratio of particle size d50and layer thickness dAof the top layer (A) being greater than 1.2 ande) the layer thickness of the top layer (A) dAbeing from 1.0 to 5 μm.The invention further relates to a process for producing the film and to its use.

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