Polyester film
It is provided that a polyester film excellent in heat resistant dimension stability, impact-resistant strength properties, easy-slipping properties, mechanical properties, transparency, and gas barrier performance, and a film roll obtained by winding up this polyester film. A polyester film includes at least one layer mainly including a polyester resin containing a dicarboxylic acid component including furandicarboxylic acid as a main component and a glycol component including ethylene glycol as a main component; and the polyester film has a plane orientation coefficient ΔP of not less than 0.005 and not more than 0.200, a thickness of not less than 1 μm and not more than 300 μm, a heat shrinkage rate of 3.2% or less in each of the MD direction and the TD direction at 150° C. for 30 minutes, and a layer containing at least one additive.
1. A polyester film comprising at least one layer mainly including a polyester resin containing a dicarboxylic acid component including furandicarboxylic acid as a main component and a glycol component including ethylene glycol as a main component; and having a plane orientation coefficient ΔP of not less than 0.005 and not more than 0.200, a thickness of not less than 1 μm and not more than 300 μm, a heat shrinkage rate of 3.2% or less in each of the MID direction and the TD direction at 150° C. for 30 minutes, and a layer containing at least one additive.
2. The polyester film according to claim 1 , wherein the plane orientation coefficient ΔP is not less than 0.100 and not more than 0.160.
3. The polyester film according to claim 2 , wherein the additive is fine particles.
4. The polyester film according to claim 3 , which has an impact strength calculated in 15 μm equivalent of 0.4 J or more.
5. The polyester film according to claim 2 , which has an impact strength calculated in 15 μm equivalent of 0.4 J or more.
6. The polyester film according to claim 1 , wherein the additive is fine particles.
7. The polyester film according to claim 6 , which has an impact strength calculated in 15 μm equivalent of 0.4 J or more.
8. The polyester film according to claim 1 , which has an impact strength calculated in 15 μm equivalent of 0.4 J or more.
9. A polyester film roll obtained by winding up the polyester film according to claim 1 .
10. A polyester film roll obtained by winding up the polyester film according to claim 2 .
11. A polyester film roll obtained by winding up the polyester film according to claim 3 .
12. A polyester film roll obtained by winding up the polyester film according to claim 4 .
13. A polyester film roll obtained by winding up the polyester film according to claim 6 .
14. A polyester film roll obtained by winding up the polyester film according to claim 8 .
15. A method for producing the polyester film according to claim 1 , the method comprising the step of:
stretching an unstretched film in a mechanical direction and a transverse direction, passing the film through a highest-temperature part in a heat fixation treatment, and separating an end portion of the film immediately after the film has been passed through the highest-temperature part; and the step of:
subjecting the resultant film to a relaxation heat treatment in the mechanical direction and the transverse direction.
16. A method for producing the polyester film according to claim 2 , the method comprising the step of:
stretching an unstretched film in a mechanical direction and a transverse direction, passing the film through a highest-temperature part in a heat fixation treatment, and separating an end portion of the film immediately after the film has been passed through the highest-temperature part; and the step of:
subjecting the resultant film to a relaxation heat treatment in the mechanical direction and the transverse direction.
17. A method for producing the polyester film according to claim 3 , the method comprising the step of:
stretching an unstretched film in a mechanical direction and a transverse direction, passing the film through a highest-temperature part in a heat fixation treatment, and separating an end portion of the film immediately after the film has been passed through the highest-temperature part; and the step of:
subjecting the resultant film to a relaxation heat treatment in the mechanical direction and the transverse direction.
18. A method for producing the polyester film according to claim 4 , the method comprising the step of:
stretching an unstretched film in a mechanical direction and a transverse direction, passing the film through a highest-temperature part in a heat fixation treatment, and separating an end portion of the film immediately after the film has been passed through the highest-temperature part; and the step of:
subjecting the resultant film to a relaxation heat treatment in the mechanical direction and the transverse direction.
19. A method for producing the polyester film according to claim 6 , the method comprising the step of:
stretching an unstretched film in a mechanical direction and a transverse direction, passing the film through a highest-temperature part in a heat fixation treatment, and separating an end portion of the film immediately after the film has been passed through the highest-temperature part; and the step of:
subjecting the resultant film to a relaxation heat treatment in the mechanical direction and the transverse direction.
20. A method for producing the polyester film according to claim 8 , the method comprising the step of:
stretching an unstretched film in a mechanical direction and a transverse direction, passing the film through a highest-temperature part in a heat fixation treatment, and separating an end portion of the film immediately after the film has been passed through the highest-temperature part; and the step of:
subjecting the resultant film to a relaxation heat treatment in the mechanical direction and the transverse direction.