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US 2011/0209747 A1Published application
Polyester film, manufacturing method thereof, polyester film for sealing back face of solar cell, protective film for back face of solar cell, and solar cell module
AssigneeFUJIFILM Corporation
InventorZemin SHI
Life of this patent
Estimating the term…
Abstract
A biaxially oriented polyester film having: an equilibrium moisture content of from 0.1% by mass to 0.25% by mass; a difference between moisture contents measured at 10 cm intervals of from 0.01% by mass to 0.06% by mass; a degree of crystallinity of from 30% to 40%; a concentration of terminal carboxyl groups of from 5 equivalents/ton to 25 equivalents/ton; and a thickness of from 100 μm to 350 μm.
Claims13
A biaxially oriented polyester film having:
- an equilibrium moisture content of from 0.1% by mass to 0.25% by mass;
- a difference between moisture contents measured at 10 cm intervals of from 0.01% by mass to 0.06% by mass;
- a degree of crystallinity of from 30% to 40%;
- a concentration of terminal carboxyl groups of from 5 equivalents/ton to 25 equivalents/ton;
- and
- a thickness of from 100 μm to 350 μm.
3 more elements
A manufacturing method of a polyester film, comprising:
- cooling a molten film-shaped polyester extruded from an extrusion die at a rate of from 250° C./min to 800° C./min;
- and
- performing a longitudinal stretching in a length direction with a stretching stress of from 5 MPa to 15 MPa and a stretch ratio of from 2.5 times to 4.5 times, and a transverse stretching in a width direction, on the cooled film-shaped polyester, so that a thickness of the polyester film after the longitudinal stretching and the transverse stretching becomes from 100 μm to 350 μm.
Dependencies are inferred from the claim text.