Abstract Disclosed herein is a laminated film comprising a polyester film containing minute closed cells and having a density of 0.40 to 1.30 g/cm³ and a polyester film having a density of more than 1.30 g/cm³ laminated on one side or both sides of the polyester film containing minute closed cells. In the laminated film of the present invention, the surface smoothness, which is a serious defect of a conventional film containing a large number of minute closed cells, is improved and the ink adhesive property is also improved, thereby enhancing the printing suitability. The breakage during the stretching process of film formation is reduced and the film forming properties are improved. Thus, the productivity was enhanced, thereby enabling the film to be supplied to the market at a low cost. Application of the film to various fields is enabled and the industrial value of the film is very large.
A laminated film comprising a uniaxially or biaxially stretched polyester film containing minute closed cells and having a density of 0.40 to 1.30 g/cm³ and a uniaxially or biaxially stretched polyester film having a density of more than 1.30 g/cm³ laminated on one side or both sides of said polyester film containing minute closed cells.
Claim 2
Dependent Claim
55 words
A laminated film comprising a uniaxially or biaxially stretched polyester film containing minute closed cells and having a density of 0.40 to 1.30 g/cm³ and a uniaxially or biaxially stretched polyester film having a density of more than 1.30 g/cm³ laminated on one side or both sides of said polyester film containing minute closed cells.
Claim 3
Dependent Claim
35 words
A laminated film according to claim 1, wherein said polyester film having a density of 0.40 to 1.30 g/cm³ comprises a polyester and 3 to 40 wt% of a crystalline polypropylene based on said polyester.
Claim 4
Dependent Claim
21 words
A laminated film according to claim 2, wherein said polypropylene have a melt flow index of 0.2 to 120 g/10 min.
Claim 5
Dependent Claim
19 words
A laminated film according to claim 1, wherein the density of said laminated film is 0.50 to 1.37 g/cm³.
Claim 6
Dependent Claim
21 words
A laminated film according to claim 1, wherein the air leakage index of said laminated film is 1000 to 10000 sec.
Claim 7
Dependent Claim
33 words
A laminated film according to claim 1, wherein the center-line averaged surface roughness on the surface of said polyester film having a density of more than 1.30 g/cm³ is 0.05 to 1.0 µm.
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