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Polyester film and laminate using same

A technology of polyester film and laminate, applied in the field of polyester film, can solve the problems of insufficient formability and complicated process, and achieve good effect of forming followability

Active Publication Date: 2013-09-04
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the above-mentioned structure is adopted, the process becomes complicated, and furthermore, it cannot be said that the formability is sufficient.

Method used

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  • Polyester film and laminate using same
  • Polyester film and laminate using same
  • Polyester film and laminate using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0151] Each polyester resin was dried at 180°C for 4 hours using a vacuum dryer to sufficiently remove moisture, then supplied to a single-screw extruder with the composition shown in the table, melted at 280°C, and filtered After removal of foreign matter and uniformity of the extrusion volume, the machine and gear pump are used to spray out in sheet form on a cooling drum (hard chrome plating with a maximum height of 0.2 μm) controlled at a temperature of 4°C using a T-die to obtain untreated Stretch film. At this time, the distance between the lip of the T-die and the cooling drum was set to 35 mm, and static electricity was applied at a voltage of 14 kV using a wire-shaped electrode with a diameter of 0.1 mm to make it adhere to the cooling drum. In addition, the passing speed of the sheet through the cooling drum was 25 m / min, and the contact length between the sheet and the cooling drum was 2.5 m.

[0152] Then, before stretching in the longitudinal direction, the tempe...

Embodiment 2

[0155] Except having controlled the cooling drum temperature to 7 degreeC, it carried out similarly to Example 1, and obtained the biaxially-oriented polyester film with a film thickness of 25 micrometers.

Embodiment 3

[0157] Except having controlled the cooling drum temperature to 15 degreeC, it carried out similarly to Example 1, and obtained the biaxially-oriented polyester film with a film thickness of 25 micrometers.

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Abstract

Provided is a polyester film, which is suitable for use in battery packages, particularly for use in deep drawn packages of lithium ion secondary batteries that comprise an electrolyte (in a solid state or in a liquid state), and which is also suitable for use in packages of pharmaceutical products that have various shapes. The polyester film is characterized in that the stresses at 5% elongation (F5 values) and the stresses at 10% elongation (F10 values) of the film in the machine direction and in the transverse direction at 25 DEG C respectively satisfy the following formulae (I) and (II). 1.5>= F10MD / F5MD>= 1 (I) 1.5>= F10TD / F5TD>= 1 (II).

Description

technical field [0001] The present invention relates to a polyester film, and particularly relates to a polyester film that can be suitably used for battery packaging, medical packaging, etc., after being laminated on a metal foil and then molded. Background technique [0002] Lithium batteries, also known as lithium secondary batteries, have liquid and gel polymers, solid polymers, polymer electrolytes, etc., and are batteries that generate current from the movement of lithium ions, including positive and negative active materials that contain polymers. lithium battery. The composition of the lithium secondary battery is: positive electrode current collector material (aluminum, nickel) / positive electrode active material layer (metal oxide, carbon black, metal sulfide, electrolyte solution, polymer positive electrode material such as polyacrylonitrile) / electrolyte layer ( Carbonate-based electrolytes such as propylene carbonate, ethylene carbonate, dimethyl carbonate, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C55/12B29C51/08B32B15/09H01M2/02H01M50/105H01M50/119H01M50/121H01M50/124H01M50/131H01M50/133H01M50/136
CPCB29K2067/00B32B27/36B32B2307/50B32B2439/00B32B2439/80B32B2457/12B32B2553/00B29K2305/02B29C51/002B29C51/14B29L2009/003B29C55/143C08J5/18C08J2367/02Y10T428/265Y10T428/31681Y10T428/31786B32B15/09Y02E60/10H01M50/131H01M50/105H01M50/133H01M50/121H01M50/124H01M50/136H01M50/119B29C55/12B29C51/08B32B2250/02B32B2367/00B32B2457/10B32B15/20B32B2307/734B32B2311/24B65D1/00B65D85/00C08G63/16C08G63/183
Inventor 真锅功田中照也高桥弘造
Owner TORAY IND INC