Patent ID: 9050743
Filing Date: 2015-06-09
Classification: B29C,B29K,B32B,C08G,Y10T

Abstract:
1. A multilayer film comprising, a base layer, wherein the base layer has an average thickness of 40 μm to 50 μm and consists of an aliphatic polycarbonate; and a surface layer laminated on a top surfaces of the base layer and on a bottom surface of the base layer, wherein each surface layer has an average thickness of 60 μm to 75 μm and comprises one or more copolyester polymer selected from poly(butylene adipate-co-terephthalate) and poly(butylene succinate); wherein the aliphatic polycarbonate is a copolymer of carbon dioxide and one or more epoxide compounds, wherein the one or more epoxide compounds are selected from the group consisting of (C wherein the base layer and the surface layer are laminated by coextrusion, wherein the coextrusion is performed by melt extruding the aliphatic polycarbonate at a temperature of 120 to 210° C. and the copolyester polymer at a temperature of 160 to 250° C. and then coextruding the aliphatic polycarbonate and the copolyester polymer using a blown or casting type of film molding machine, and wherein the multilayer film is a three-layer film consisting of the base layer and the surface layers and does not include an adhesive layer or a tie layer, and the base layer and the surface layers are not delaminated in a delamination test using adhesive tape when performed on the multilayer film having an average thickness of 170 μm to 190 μm, a width of 5 cm and a length of 20 cm.