Polyester film, laminated film, and solar-cell back sheet and solar cell both including same

A technology of solar cells and polyester films, which is applied in the field of polyester films, can solve problems such as hydrolysis degradation and reduced heat and humidity resistance, and achieve high durability, excellent time and high heat and humidity resistance effects

Active Publication Date: 2012-05-09
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in order to make polyester films, especially polyester films mainly composed of ethylene terephthalate units, highly functional, when mixing other components (such as ultraviolet absorbers, inorganic particles, etc.), mixing Deterioration occurs due to hydrolysis during kneading, and the obtained film exhibits the functions of the added components, but there is a problem that the heat and humidity resistance decreases.

Method used

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  • Polyester film, laminated film, and solar-cell back sheet and solar cell both including same
  • Polyester film, laminated film, and solar-cell back sheet and solar cell both including same
  • Polyester film, laminated film, and solar-cell back sheet and solar cell both including same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0190] Using 100 mol% of terephthalic acid as a dicarboxylic acid component, 100 mol% of ethylene glycol as a glycol component, and using magnesium acetate, antimony trioxide, and phosphorous acid as a catalyst, the polycondensation reaction was carried out. Then, the obtained polyethylene terephthalate was dried at 160°C for 6 hours to make it crystallized, and then solid-phase polymerized at 220°C and a vacuum of 0.3 Torr for 9 hours to obtain a polyethylene terephthalate with a melting point of 255°C. Ethylene terephthalate (PET) (crystalline polyester resin A). Next, use 95mol% terephthalic acid, 5mol% isophthalic acid as the dicarboxylic acid component, use 100mol% cyclohexanedimethanol as the glycol component, and use magnesium acetate, antimony trioxide, and phosphorous acid as the catalyst to carry out Polycondensation reaction to obtain polycyclohexanedimethylene terephthalate (PCT / I5mol%) (crystalline polyester resin B) containing 5 mol% isophthalic acid having a mel...

Embodiment 2～5、21、22

[0194]A biaxially stretched film was obtained in the same manner as in Example 1, except that the stretch ratio was changed as shown in Table 1 in the film production process. The resulting film was evaluated as follows: the flatness of the dispersed phase of the crystalline polyester resin B, the ratio of titanium oxide particles present in or in contact with the dispersed phase of the crystalline polyester resin B, the average relative reflectance, and the heat and humidity resistance test. Evaluation of mechanical properties and mechanical properties after light resistance test. As a result, as shown in Table 1, it was a film with good heat-and-moisture resistance, light resistance, and light reflectivity, and it was found that the film with higher flatness of crystalline polyester resin B was a film with better heat-and-moisture resistance. In addition, using the above-mentioned film, a solar battery back sheet was produced in the same manner as in Example 1, and the moist...

Embodiment 6

[0196] Use 92mol% terephthalic acid, 8mol% isophthalic acid as the dicarboxylic acid component, use 100mol% cyclohexanedimethanol as the glycol component, and use magnesium acetate, antimony trioxide, and phosphorous acid as the catalyst to carry out the polycondensation reaction, In the same manner as in Example 1, except that polycyclohexanedimethylene terephthalate (PCT / I 8 mol%) containing 8 mol% of isophthalic acid having a melting point of 270° C. was used as the crystalline polyester resin B get the film. The resulting film was evaluated as follows: the flatness of the dispersed phase of the crystalline polyester resin B, the ratio of titanium oxide particles present in or in contact with the dispersed phase of the crystalline polyester resin B, the average relative reflectance, and the ratio after the heat and humidity resistance test. Evaluation of mechanical properties and mechanical properties after the light resistance test. As a result, as shown in Table 1, it wa...

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Abstract

The invention is to provide a polyester film excellent in moist heat resistance and other characteristics (ultraviolet ray resistance, light reflecting characteristic, etc.), and to provide a solar battery backsheet excellent in moist heat resistance and ultraviolet ray resistance by using the polyester film. It is also a task to provide a highly durable solar battery by using the solar battery backsheet. The polyester film is a polyester film containing particles and two kinds of crystalline polyester resins in which a sea-island structure is formed, and being characterized in that if a crystallization temperature of a crystalline polyester resin that forms a continuous phase (also referred to as matrix phase) (hereinafter, referred to as crystalline polyester resin A) is represented by TccA and a crystallization temperature of a crystalline polyester resin that forms a dispersion phase (also referred to as domain phase) (hereinafter, referred to as crystalline polyester resin B) is represented by TccB, an expression (1) below is satisfied, and that a degree of flatness of the dispersion phase is 3 or more, and that 70% or more of a total number of the particles are present in the dispersion phase or are in contact with the dispersion phase. TccA - TccB 5 DEG C.

Description

technical field [0001] The present invention relates to a polyester film which can be used particularly preferably as a solar cell back sheet, and also to a solar cell back sheet and a solar cell using the film. Background technique [0002] Polyester (especially polyethylene terephthalate, polyethylene 2,6-naphthalate, etc.) resins are excellent in mechanical properties, thermal properties, chemical resistance, electrical properties, and moldability , for a variety of purposes. The polyester resin is formed into a film to obtain a polyester film, wherein the biaxially oriented polyester film can be used as a copper-clad laminate, solar battery backplane, adhesive tape, flexible printing, etc. in consideration of its mechanical properties and electrical properties. Electrical insulating materials such as substrates, membrane switches, planar heating elements, or flat cables, magnetic recording materials, capacitor materials, packaging materials, automotive materials, buildi...

Claims

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Application Information

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IPC IPC(8): C08J5/18B32B27/36H01L31/042
CPCH01L31/0487Y02E10/52H01L31/0481C08J2367/02C08J5/18B32B9/00B32B2307/412H01L31/049Y02E10/50Y10T428/254Y10T428/249921B32B27/36C08L67/02
Inventor 青山滋岛津绫子盐见笃史高桥弘造
Owner TORAY IND INC
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