A process for producing a heat-sealable polymeric film comprises the steps of:
(a) melt-extruding a substrate layer of polymeric material;
(b) stretching the substrate layer in a first direction;
(c) optionally stretching the substrate layer in a second, orthogonal direction;
(d) optionally heat-setting the stretched substrate layer;
(e) forming a heat-sealable coating layer on a surface of the substrate
layer by melt-coating directly thereon a molten polymeric material; and
(f) cooling the coated substrate layer;
wherein coating step (e) is prior to step (b) or between steps (b) and (c);
wherein the thickness of the coating layer is less than about 8 m; wherein
the molten polymeric material of the coating layer comprises a copolyester, and
wherein the molten polymeric material comprises a copolyester.
