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Uniaxially stretched multilayer laminate film, and optical member comprising same

A technology of uniaxial stretching and lamination of films, applied in optical elements, optical elements, optics, etc., can solve limited and difficult to fully ensure the adhesion of the prism layer, and reduce the reactivity of thermosetting crosslinking agents.

Inactive Publication Date: 2017-03-08
TEIJIN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In particular, in solvent-free UV-curable resins such as prism layers, it is impossible to expect an improvement in adhesion by dissolving the base material with an organic solvent, so coating films that can ensure adhesion are extremely limited (Patent Documents 10, 11 Wait)
[0022] In the case of forming such an easily-adhesive coating film on a reflective polarization brightness enhancement film, polyester resins other than PET are often used as the reflection polarization brightness enhancement film. In most cases, there is no crystallization process, so the reactivity of the thermosetting crosslinking agent is reduced, and it is difficult to ensure sufficient adhesion to the prism layer even if the coating liquid composition is the same as that of the PET film base material

Method used

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  • Uniaxially stretched multilayer laminate film, and optical member comprising same
  • Uniaxially stretched multilayer laminate film, and optical member comprising same
  • Uniaxially stretched multilayer laminate film, and optical member comprising same

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preparation example Construction

[0238]

[0239] Next, the method for producing the uniaxially stretched multilayer laminated film of the present invention will be described in detail.

[0240] In the uniaxially stretched multilayer laminate film of the present invention, a polymer constituting the first layer and a polymer constituting the second layer are alternately laminated in a molten state to prepare an alternate laminate of a total of 101 or more layers or a total of 300 or less layers , preferably on both sides of which a layer of thick film (buffer layer) is provided, and the alternate laminate with the buffer layer is divided into, for example, 2 to 4 parts using a device called layer doubling, taking the alternate laminate with the buffer layer as 1 Blocks are laminated again so that the number of layers (multiplication number) of the block becomes 2 to 4 times, and the above-mentioned method can be used to increase the number of layers. By such a method, it is possible to obtain an intermediate...

Embodiment 1-1

[0375] As the polyester for the first layer, dimethyl 2,6-naphthalene dicarboxylate, dimethyl terephthalate, and ethylene glycol were transesterified in the presence of titanium tetrabutoxide, followed by polycondensation. Prepare 95 mol% of the acid component as a 2,6-naphthalene dicarboxylic acid component (represented as PEN in the table), 5 mol% of the acid component as a terephthalic acid component (represented as DMT in the table), and the diol component as Copolyester of ethylene glycol (DMT5PEN) (intrinsic viscosity 0.64dl / g).

[0376] In addition, as the polyester for the second layer, dimethyl 2,6-naphthalene dicarboxylate, dimethyl terephthalate, ethylene glycol, and trimethylene glycol were transesterified in the presence of titanium tetrabutoxide , and then continue the polycondensation reaction, prepare 50 mol% of the acid component as 2,6-naphthalene dicarboxylic acid component (recorded as PEN in the table), and 50 mol% of the acid component as terephthalic aci...

Embodiment 1-2~1-4

[0380] [Example 1-2~1-4, Comparative Example 1-1~1-2]

[0381] As shown in Table 1-1, except that the resin composition of each layer, layer thickness, and stretching conditions were changed, it carried out similarly to Example 1-1, and obtained the uniaxially stretched multilayer laminated film. The resin composition of each layer of the uniaxially stretched multilayer laminated film obtained as described above, the characteristics of each layer, and the physical properties of the uniaxially stretched multilayer laminated film are shown in Table 1-1.

[0382] [Coating solution 1-A]

[0383] (acrylic adhesive)

[0384] It consists of 60 mol% methyl methacrylate / 30 mol% ethyl acrylate / 5 mol% 2-hydroxyethyl acrylate / 5 mol% N-methylolacrylamide (Tg=40°C). In a four-necked bottle, put 302 parts of ion-exchanged water and raise the temperature to 60° C. in a nitrogen stream, then add 0.5 parts of ammonium persulfate and 0.2 parts of sodium bisulfite as a polymerization initiator,...

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Abstract

Provided is a uniaxially stretched multilayer laminate film in which a first layer and a second layer are alternately laminated, wherein 1) the first layer is a layer containing a polyester, the polyester containing ethylene naphthalate units in a range of 50-100 mol%, inclusive, based on the repeating units that make up the polyester, and 2) the polymer forming the second layer is a copolymer polyester that includes a 2,6-naphthalenedicarboxylic acid component, an ethylene glycol component, and a trimethylene glycol component as the copolymer components, (A) the content of the ethylene naphthalate units in the polyester of the first layer constituting 80-100 mol%, inclusive, based on the repeating units that make up the polyester, and (B) the polymer forming the second layer being a copolymer polyester that further includes an alicyclic diol component as a copolymer component. This film is a polymer film of multilayer structure employing a polyethylene naphthalate polymer in a layer having high refractive index characteristics, and is thereby provided with polarizing capability, as well as improved cohesion between layers.

Description

technical field [0001] The present invention relates to a uniaxially stretched multilayer laminate film and an optical part comprising the same. More specifically, it relates to a uniaxially stretched multilayer laminated film, which is a polymer film of a multilayer structure, and has reflective polarization properties and an optical component comprising the same, and an optical component comprising the same. Adhesiveness. Background technique [0002] (Multilayer Lamination Film, Brightness Enhancement Film) [0003] A film in which a plurality of layers with a low refractive index and layers with a high refractive index are laminated alternately can be used as an optical interference film that selectively reflects or transmits light of a specific wavelength due to structured light interference between layers. In addition, in such a multilayer laminated film, by gradually changing the film thickness or laminating films having different reflection peaks, high reflectance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/36G02B5/30
CPCB32B27/36G02B5/30B32B2250/05B32B2250/244B32B2250/42B32B2457/20B32B2551/00B32B27/08B32B2307/418B32B2307/516B32B2457/202G02F1/1335B32B2307/42G02B5/0268G02B5/305G02F1/133528G02F1/13362
Inventor 清水智子大宅太郎冈田悠哉久保耕司
Owner TEIJIN LTD
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