Patent ID: 8895103

Claim:
A method for manufacturing a shrinkable film, the method comprising: a) preparing an unstretched film by melting and extruding 10-99 wt % of lactic acid and 1-90 wt % of aliphatic or aliphatic-aromatic polyester resin; b) coating a water-dispersed polyurethane coating composition on one surface of the unstretched film through an in-line coating process; c) uniaxially stretching the unstretched film coated with the water-dispersed polyurethane coating composition in the transverse direction (TD); d) heat-treating the uniaxially stretched film at 50-100° C.; and e) forming a metal deposition layer with a thickness of 200 Å-1000 Å on a polyurethane coating layer of the uniaxially stretched film.