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Easy Adhesive Polyester Film

A polyester film, easy-adhesive technology, applied in the direction of polarizing elements, synthetic resin layered products, chemical instruments and methods, etc., can solve the problems of insufficient adhesion between polyester film and hydrophilic adhesives, etc. , to achieve the effect of excellent environmental adaptability and excellent adhesion

Active Publication Date: 2022-05-06
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyester films do not have sufficient adhesion to hydrophilic adhesives, and this tendency is particularly pronounced for polyester films that have been oriented by stretching.

Method used

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  • Easy Adhesive Polyester Film
  • Easy Adhesive Polyester Film
  • Easy Adhesive Polyester Film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0148] (1) Preparation of coating solution

[0149] Mix the following coating agents to prepare the solid content ratio of polyester resin (A-1) / polyvinyl alcohol resin (B-1) / reactive methylene-blocked isocyanate crosslinking agent (C-1) It is 92 / 3 / 5 coating solution. The aqueous polyester dispersion uses the aqueous dispersion (Aw-1) that is dispersed with the polyester resin of acid value 2KOHmg / g, and the polyvinyl alcohol aqueous solution uses the aqueous solution that is dissolved in the polyvinyl alcohol (Bw- 1).

[0150]

[0151] (2) Manufacture of easy-adhesive polyester film

[0152] As a film base polymer, PET resin pellets having an intrinsic viscosity (solvent: phenol / tetrachloroethane = 60 / 40) of 0.62 dl / g and substantially no particles were dried at 135°C under a reduced pressure of 133 Pa. 6 hours. Then, it was supplied to an extruder, melt-extruded into a sheet form at about 280° C., and quenched and solidified on a rotating cooling metal roll whose surf...

Embodiment 2

[0156] The following coating agents were mixed, and the solid content ratio of polyester resin (A-1) / polyvinyl alcohol resin (B-1) / active methylene blocked isocyanate crosslinking agent (C-1) Except having changed into 83 / 5 / 12, it carried out similarly to Example 1, and obtained the easily-adhesive polyester film.

[0157]

Embodiment 3

[0159] Except having changed polyester resin into (A-2) and polyester aqueous dispersion into (Aw-2), it carried out similarly to Example 2, and obtained the easily-adhesive polyester film.

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Abstract

[Problems] The present invention provides an adhesive layer-forming composition that does not substantially contain an organotin compound as a crosslinking / curing catalyst, and that has excellent adhesion between a polyester film and a functional layer such as a polarizer or an adhesive layer, Furthermore, it is an easily adhesive polyester film that does not block in the presence of dew condensation water. [Solution] An easy-adhesive polyester film, which has an easy-adhesive layer on at least one side, and the aforementioned easy-adhesive layer is composed of polyester resin, polyvinyl alcohol resin and active methylene A composition obtained by curing a blocked isocyanate crosslinking agent, the curing catalyst of the composition in the easily bonding layer does not substantially contain organic tin, and the peeling force of the easily bonding polyester film is 2 N / cm or less after water adhesion .

Description

technical field [0001] The present invention relates to an easily-adhesive polyester film that does not cause blocking even if dew condensation water adheres, has excellent adhesiveness to polarizers and functional layers, and is also excellent in environmental adaptability. The easily-adhesive polyester film of the present invention is suitable as a base film for optical members such as displays, and is particularly suitable as a polarizer protective film. Background technique [0002] In a liquid crystal display device, polarizing plates are arranged on both sides of a glass substrate forming a surface of a liquid crystal panel due to its image forming method. A polarizing plate generally has a structure in which a polarizer protective film is bonded to both surfaces of a polarizer made of a polyvinyl alcohol-based film and a dichroic material such as iodine via a hydrophilic adhesive such as a polyvinyl alcohol-based resin. As a protective film for protecting a polarizer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/36G02B5/30
CPCG02B5/30B32B27/36C08J5/18C08K5/29C08J2367/00C08J2467/00C08J2429/04C08J7/043
Inventor 广瀬友香中岛涉山口洋平
Owner TOYOBO CO LTD