| 摘要 |
<p>Coextruded, transparent polyester film with a heat-sealable and peelable outer layer (A) of polyester containing particles with a d50 of 2.5-12.0 microns, in which the polyester comprises 12-89 mol% aromatic dicarboxylic acid units and 11-88 mol% aliphatic diacid units, the ratio of d50 and thickness (dA) of layer (A) is 1.0 or more, and dA is 2.3-10.0 microns. Coextruded, transparent, biaxially-oriented polyester film with a base layer (B) and a heat-sealable and peelable (at least on CPET) outer layer (A) comprising (a) 80-98 wt% polyester and (b) 2-10 wt% inorganic and/or organic particles with an average diameter (d50) of 2.5-12.0 microns, in which (c) the polyester comprises 12-89 mol% aromatic dicarboxylic acid units and 11-88 mol% aliphatic dicarboxylic acid units, (d) the ratio of d50 and the thickness (dA) of layer (A) is 1.0 or more and (e) dA = 2.3-10.0 microns. An independent claim is also included for a method for the production of this film by feeding the polymers for layers (B) and (A) and optionally outer layer (C) into separate extruders, passing the melts through a multi-layer die to form flat, coextruded melt film, drawing off and solidifying the multilayer film over a cooling roller and optionally other rollers, stretching first in the machine direction (MD) at 60-130[deg]C (by a ratio of (2:1)-(5.5:1)) and then in the cross direction (TD) at 90-140[deg]C (by a ratio of (2.4:1)-(5.0:1)), and then heat fixing.</p> |
