Thin-film polarizer, method for manufacturing the same, and polarizer and display device including the same

Abstract

The present invention relates to a method for manufacturing a thin polarizer, comprising the steps of: forming a film laminate body by alternately attaching at least two unstretched polymer films and at least two unstretched polyvinyl alcohol-based films by means of an attractive force or an adhesive layer; stretching the film laminate body so that the polyvinyl alcohol-based films have a thickness of 10 μm or less after the stretching; and separating the polymer films and the polyvinyl alcohol-based films from the stretched film laminate body.

Description

technical field

[0001] The present disclosure relates to a thin film polarizer, a manufacturing method thereof, and a polarizing plate and a display device including the thin film polarizer, and more specifically, the present disclosure relates to a thin film polarizer having a thickness of 10 μm or less, a manufacturing method thereof, And a polarizing plate and a display device comprising the film polarizing plate. Background technique

[0002] The polarizer used in the polarizing plate is an optical device that converts natural light or arbitrarily selected polarized light into polarized light with a specific directionality, and has been widely used in display devices, such as liquid crystal display devices and organic light-emitting devices ( OLED). As polarizers hitherto used in display devices, polyvinyl alcohol (PVA)-based polarizing films containing iodine-based compounds or dichroic dyes and having molecular chains stretched in a predetermined direction have genera...

Examples

Embodiment 1

[0100] Three sheets of unstretched polyvinyl alcohol-based film and two sheets of unstretched polyurethane film were alternately stacked on each other without using a medium material, thereby forming an unstretched film laminate having the following structure : Unstretched polyvinyl alcohol-based film / unstretched polyurethane film / unstretched polyvinyl alcohol-based film / unstretched polyurethane film / unstretched polyvinyl alcohol-based film.

[0101] In this case, as the unstretched polyvinyl alcohol-based film, a PE30-grade polyvinyl alcohol-based film (thickness: 30 μm) of Kuraray Corporation was used, and allowed to stand in a pure solution at 25° C. Swelling was performed for 15 seconds, and then a dyeing process was performed at a temperature of 25°C for 60 seconds using an iodine solution having a concentration of 0.3 wt%.

[0102] On the other hand, as the unstretched polyurethane film, a film produced by a thermoplastic polyurethane resin obtained by reacting diphenylm...

Embodiment 2

[0105] Two sheets of unstretched polyvinyl alcohol-based films and two sheets of unstretched polyurethane films were alternately stacked on each other without using a medium material, and in addition to forming an unstretched polyvinyl alcohol-based film with In addition to the unstretched film laminate of the structure of / unstretched polyurethane film / unstretched polyvinyl alcohol-based film / unstretched polyurethane film, by the same method as in Example 1, Two thin-film polarizers with a thickness of 5 to 7 μm.

Embodiment 3

[0107] A 4 wt% aqueous solution was prepared by dissolving polyvinyl alcohol (average degree of polymerization: 2000, saponification degree: 94%, manufactured by Nippon Synthetic Chemicals Co., Ltd.) containing acetoacetyl group (5 wt%) in pure water. Here, with respect to 100 parts by weight of polyvinyl alcohol, 6.7 parts by weight of a titanium amine complex crosslinking agent (TYZOR TE produced by DuPont) was added and stirred to mix, whereby an adhesive A was produced.

[0108] Coating adhesive A to a thickness of 100 nm on both side surfaces of an unstretched polyurethane film, and then bonding two unstretched polyvinyl alcohol-based films to produce an unstretched polyvinyl alcohol-based Film laminate 1 of the structure of vinyl alcohol film / unstretched polyurethane film / unstretched polyvinyl alcohol-based film. Adhesive A is coated to a thickness of 100 nm on one side surface of another unstretched polyurethane film, and then a piece of unstretched polyvinyl alcohol-ba...

technical field

[0001] The present disclosure relates to a thin film polarizer, a manufacturing method thereof, and a polarizing plate and a display device including the thin film polarizer, and more specifically, the present disclosure relates to a thin film polarizer having a thickness of 10 μm or less, a manufacturing method thereof, And a polarizing plate and a display device comprising the film polarizing plate. Background technique

[0002] The polarizer used in the polarizing plate is an optical device that converts natural light or arbitrarily selected polarized light into polarized light with a specific directionality, and has been widely used in display devices, such as liquid crystal display devices and organic light-emitting devices ( OLED). As polarizers hitherto used in display devices, polyvinyl alcohol (PVA)-based polarizing films containing iodine-based compounds or dichroic dyes and having molecular chains stretched in a predetermined direction have genera...

Examples

Embodiment 1

[0100] Three sheets of unstretched polyvinyl alcohol-based film and two sheets of unstretched polyurethane film were alternately stacked on each other without using a medium material, thereby forming an unstretched film laminate having the following structure : Unstretched polyvinyl alcohol-based film / unstretched polyurethane film / unstretched polyvinyl alcohol-based film / unstretched polyurethane film / unstretched polyvinyl alcohol-based film.

[0101] In this case, as the unstretched polyvinyl alcohol-based film, a PE30-grade polyvinyl alcohol-based film (thickness: 30 μm) of Kuraray Corporation was used, and allowed to stand in a pure solution at 25° C. Swelling was performed for 15 seconds, and then a dyeing process was performed at a temperature of 25°C for 60 seconds using an iodine solution having a concentration of 0.3 wt%.

[0102] On the other hand, as the unstretched polyurethane film, a film produced by a thermoplastic polyurethane resin obtained by reacting diphenylm...

Embodiment 2

[0105] Two sheets of unstretched polyvinyl alcohol-based films and two sheets of unstretched polyurethane films were alternately stacked on each other without using a medium material, and in addition to forming an unstretched polyvinyl alcohol-based film with In addition to the unstretched film laminate of the structure of / unstretched polyurethane film / unstretched polyvinyl alcohol-based film / unstretched polyurethane film, by the same method as in Example 1, Two thin-film polarizers with a thickness of 5 to 7 μm.

Embodiment 3

[0107] A 4 wt% aqueous solution was prepared by dissolving polyvinyl alcohol (average degree of polymerization: 2000, saponification degree: 94%, manufactured by Nippon Synthetic Chemicals Co., Ltd.) containing acetoacetyl group (5 wt%) in pure water. Here, with respect to 100 parts by weight of polyvinyl alcohol, 6.7 parts by weight of a titanium amine complex crosslinking agent (TYZOR TE produced by DuPont) was added and stirred to mix, whereby an adhesive A was produced.

[0108] Coating adhesive A to a thickness of 100 nm on both side surfaces of an unstretched polyurethane film, and then bonding two unstretched polyvinyl alcohol-based films to produce an unstretched polyvinyl alcohol-based Film laminate 1 of the structure of vinyl alcohol film / unstretched polyurethane film / unstretched polyvinyl alcohol-based film. Adhesive A is coated to a thickness of 100 nm on one side surface of another unstretched polyurethane film, and then a piece of unstretched polyvinyl alcohol-ba...

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