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Readily adherable polyester film

A polyester film, easy-adhesive technology, applied in the direction of polyester coatings, film/sheet adhesives, adhesives, etc., can solve the high toxicity of organotin, the limitation of organotin compounds, and light-curable adhesives Eliminates problems such as reduced adhesion with the easy-adhesive layer, and achieves excellent adhesion and environmental suitability

Pending Publication Date: 2021-10-19
TOYO TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, organotin compounds are known to be highly toxic and affect organisms even in small amounts, and the use of organotin compounds has been limited in recent years
In addition, if an organotin catalyst is used, the adhesion between the photocurable adhesive and the easily bonding layer tends to decrease.
This is presumed to be due to the fact that organotin catalysts reduce the activity of photocation catalysts

Method used

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  • Readily adherable polyester film
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  • Readily adherable polyester film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0199] (1) Adjustment of coating liquid

[0200] 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 became a coating liquid of 92 / 3 / 5. 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).

[0201]

[0202]

[0203] (2) Manufacture of easy-adhesive polyester film

[0204] 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...

Embodiment 2

[0208] 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.

[0209]

[0210]

Embodiment 3

[0212] In the coating solution, except that the polyester-based resin was changed to (A-2) and the polyester aqueous dispersion was changed to (Aw-2), the same procedure as in Example 2 was carried out to obtain an easily-adhesive polyester film.

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Abstract

The invention addresses the problem of providing a readily adherable polyester film containing substantially no organotin compound as a cross-linking / curing catalyst within a composition forming a readily adhering layer, and demonstrating excellent tight-adhesion to both hydrophilic adhesives and photo-curable adhesives. The polyester film has a readily adhering layer on at least one surface thereof. The readily adhering layer is yielded by curing a composition comprising a polyester-based resin, a polyvinyl alcohol-based resin, and a cross-linking agent having a nitrogen element. The readily adherable polyester film contains substantially no organotin as a curing catalyst for the composition in the readily adhering layer. On the readily adhering layer surface, the content percentage of the nitrogen element among the elements constituting the surface is between 2.0 at% and 3.0 at% inclusive as analyzed by ESCA (electron spectroscopy for chemical analysis).

Description

technical field [0001] For example, the present invention relates to an easily-adhesive polyester film exhibiting excellent adhesion to both a hydrophilic adhesive and a photocurable adhesive for bonding a polarizing plate and a polarizing plate protective film . 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. In the past, polarizing plates generally have a polarizer protective film bonded to both sides of a polarizer made of a polyvinyl alcohol-based film and a dichroic material such as iodine with a hydrophilic adhesive such as a polyvinyl alcohol-based resin. structure. As a protective film for protecting a polarizing plate, a t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J167/02C09J129/04C09J11/04C09J7/25
CPCC09J167/02C09J129/04C09J11/04C09J7/255C08K2201/014C08L2203/20C09J2301/122C09J2467/006C09J2203/318C08L29/04C08K3/36C08L67/02B32B27/36C08J7/043C08J5/18C09D129/04C09D167/00G02B1/10C08J2367/00
Inventor 池田友香惠岛明纪山口洋平
Owner TOYO TOYOBO CO LTD
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