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Durable polyester film, method for producing same, film for sealing solar cell which is produced using same, and solar cell

A manufacturing method and technology of polyester film, applied in the field of polyester film, can solve problems such as deterioration of yield, easy agglomeration, shortening filter life in filtration process, etc., and achieve the effect of less internal defects

Active Publication Date: 2015-02-11
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the buffers used in Patent Documents 4 and 5 have the problem of being easily aggregated when added, and these aggregates shorten the life of the filter in the filtration process, or the fine aggregates remaining due to incomplete filtration Remains inside the film as foreign matter, so there is also a problem that the yield will deteriorate in the form of poor appearance

Method used

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  • Durable polyester film, method for producing same, film for sealing solar cell which is produced using same, and solar cell
  • Durable polyester film, method for producing same, film for sealing solar cell which is produced using same, and solar cell
  • Durable polyester film, method for producing same, film for sealing solar cell which is produced using same, and solar cell

Examples

Experimental program
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Embodiment

[0110] [Measurement method of physical properties]

[0111] Hereinafter, the configuration and effects of the present invention will be described more concretely using examples. It should be noted that the present invention is not limited to the following examples. Before describing each example, measuring methods of various physical properties are described.

[0112] (1) Diethylene glycol (DEG) content

[0113] Using 2.5 mL of monoethanolamine as a solvent, 1.0 g of a measurement sample (polyester resin (raw material) or polyester film) was hydrolyzed at 260°C. Next, 10 mL of methanol was added, cooled, neutralized with terephthalic acid, centrifuged, and diethylene glycol in the supernatant was measured with a gas chromatograph (GC-14A manufactured by Shimadzu Corporation). (DEG) content. In addition, additive components such as inorganic particles settle as insoluble matter during centrifugation, so the sedimented components are filtered and weighed, and the weight is s...

reference example 1

[0170] [Reference Example 1] Preparation of Polyester Resin 1

[0171] As a first step, 100 parts by mass of dimethyl terephthalate, 38.15 parts by mass of ethylene glycol, and 0.25 parts by mass of diethylene glycol were mixed under a nitrogen atmosphere at a temperature of 260°C. Then, the temperature was lowered to 225° C., 0.068 parts by mass of manganese acetate tetrahydrate and 0.029 parts by mass of antimony trioxide were added, and then 15.9 parts by mass of ethylene glycol and 0.10 parts by mass of diethylene glycol were gradually added over 2 hours while stirring. The mixture, methanol was distilled off at the same time, to end the transesterification reaction. As the second step, after the transesterification reaction is completed, the temperature of the polyester in the reaction system is set to 225°C, and 0.015 parts by mass of phosphoric acid (corresponding to 1.5 mol / t) and 0.027 parts by mass of sodium dihydrogenphosphate dihydrate are added. (corresponding to...

reference example 2

[0172] [Reference Example 2] Preparation of Polyester Resin 2-26

[0173] Except having used the conditions shown in Table 1-1 and Table 1-2, the polyester resin was obtained using the method similar to the reference example 1. It should be noted that, for polyester resin 5, 85.6 parts by mass of terephthalic acid was used instead of 100 parts by mass of dimethyl terephthalate, and for polyester resins 11 and 12, instead of sodium dihydrogen phosphate dihydrate, Potassium dihydrogen phosphate was used. In addition, regarding polyester resins 8, 9, and 23, the solid-phase polymerization time in the fourth step was adjusted so as to have the intrinsic viscosities shown in Table 1-1 and Table 1-2. In addition, regarding the polyester resin 24, the intrinsic viscosity of the polyester in the third step is 0.50, and the number of carboxyl terminal groups is 27 equivalents / t, and then, in the fourth step, solid-state polymerization is performed until the intrinsic viscosity becomes...

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Abstract

Provided are: a polyester film which can maintain the durability thereof even under high-temperature / high-humidity conditions, rarely undergoes the occurrence of thickness failure, breakage, internal defects in the film and the like during the process of producing the film, and has excellent productivity; and a method for producing the film. A biaxially oriented polyester film comprising a polyester resin containing 0.1 to 5.0 moles / t inclusive of an alkali metal phosphate salt, wherein the intrinsic viscosity (IV) of the polyester resin that constitutes the film is 0.65 to 0.80 inclusive, the content of a terminal carboxyl group is 20 equivalents / t or less, the content of diethylene glycol is 0.9 to 3.0 mass% inclusive, and the average speed of sound of the film is 2.20 km / sec or more.

Description

technical field [0001] The present invention relates to a durable polyester film. In more detail, it relates to a polyester film which has a high property retention rate in a heat-and-humidity environment, and which is excellent in film productivity and processability, and is particularly useful for solar cell sealing films, It is also useful for outdoor use such as building materials and automotive materials. Background technique [0002] Polyester resins have excellent mechanical properties, thermal properties, chemical resistance, electrical properties, and moldability, and have been used in various applications. The polyester film made of the polyester resin, especially the biaxially oriented polyester film, has been used as a copper-clad laminate, solar cell sealant, etc. due to its mechanical properties, electrical properties, etc. Electrical insulating materials such as films, adhesive tapes, flexible printed circuit boards, membrane switches, planar heating element...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18B29C55/14C08G63/83C08K3/32C08K5/06C08L67/02H01L31/048B29K67/00B29L7/00B29L31/34
CPCC08J5/18H01L31/0481C08J2367/02B29C55/143B29K2067/00Y02E10/50C08G63/692C08G2261/91C08J2367/00C08K3/32C08K5/053C08L67/02C08L2203/162
Inventor 松永笃吉井隆晃青木里纱
Owner TORAY IND INC
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