US20070096367A1 - Thin films and fabrication method therefor - Google Patents

Thin films and fabrication method therefor Download PDF

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Publication number
US20070096367A1
US20070096367A1 US11/397,403 US39740306A US2007096367A1 US 20070096367 A1 US20070096367 A1 US 20070096367A1 US 39740306 A US39740306 A US 39740306A US 2007096367 A1 US2007096367 A1 US 2007096367A1
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thin film
fabricating
film
stretched
dicarboxylic acid
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US11/397,403
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Cheng Tsai
Chung Fu
Chun Lin
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BenQ Materials Corp
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Daxon Technology Inc
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Assigned to DAXON TECHNOLOGY INC. reassignment DAXON TECHNOLOGY INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FU, CHUNG-NENG, LIN, CHUN-HUNG, TSAI, CHENG-HSIN
Priority to US11/737,131 priority Critical patent/US20070187023A1/en
Priority to US11/743,155 priority patent/US20070200967A1/en
Publication of US20070096367A1 publication Critical patent/US20070096367A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2029/00—Use of polyvinylalcohols, polyvinylethers, polyvinylaldehydes, polyvinylketones or polyvinylketals or derivatives thereof as moulding material
    • B29K2029/04—PVOH, i.e. polyvinyl alcohol

Definitions

  • the invention relates to a thin film, and more specifically to a thin polarization film and a method of fabricating the same.
  • LCD liquid crystal displays
  • Polyvinyl alcohol (PVA) polarization films are generally categorized into iodine-type films where iodine is adsorbed on a properly oriented PVA film, dye-type films where a dichroic dye is adsorbed rather than iodine, and polyene-type films obtained by partial dehydration.
  • a polarizer generally comprises a central stretched PVA film and at least one protective layer, typically of triacetyl cellulose (TAC).
  • TAC triacetyl cellulose
  • the stretched and dried PVA film is a main polarizing element, with a thickness commonly around 20 ⁇ 35 ⁇ m and a stretching ratio of about 5 ⁇ 6, most often 5.8.
  • the conventional abovesaid PVA polarization film is thick, narrow, and has a low-stretching-ratio, resulting in low utilization yield thereof, even with an extremely high width ratio (original/stretched) of 2 ⁇ 2.5, fully unsatisfied to the requirement of large-sized panels.
  • U.S. Pat. No. 6,760,156 and 6,855,276 provide methods for increasing optical properties and uniformity of films by dry processes. A stretching ratio of 5 ⁇ 7 can be achieved. Few efforts, however, are put to increase the stretching ratio/width and decrease the thickness of the resulted polarizing element. Thus, a thin and high stretching ratio/width stretched PVA film is desired to achieve the maximum material utilization yield.
  • the invention provides a method for fabricating a thin film, in which a thin film having a hydroxyl groups-containing surface is placed and stretched in a water tank containing dicarboxylic acid.
  • the invention also provides a thin film fabricated by the disclosed method.
  • FIG. 1 shows chemical bonding between dicarboxylic acid and boric acid and a polyvinyl alcohol film surface.
  • FIG. 2 shows a result of thermal mechanical analysis (TMA) of the polarizer fabricated by example 4 of the invention.
  • FIG. 3 shows an extending path of a polarization film in an extending tank of the invention.
  • FIG. 4 shows another extending path of a polarization film in an extending tank of the invention.
  • the invention provides a method for fabricating a thin film, in which a thin film having a hydroxyl groups-containing surface is placed and stretched in a water tank containing dicarboxylic acid.
  • the thin film having a hydroxyl groups-containing surface may be a polyvinyl alcohol film.
  • the thin film may further be swollen and dyed with an iodine solution containing molecular iodine and iodide ions.
  • the molecular iodine has a weight percentage of about 0.01 ⁇ 0.1% and the iodide ions a weight percentage of about 0.1 ⁇ 10%.
  • the dicarboxylic acid may have 4 ⁇ 6 carbons, such as an adipic acid.
  • the dicarboxylic acid has a weight percentage of about 1 ⁇ 10%, preferably 2 ⁇ 5%.
  • transition metal ions such as zinc, hydrochloric acid, sulfuric acid, or boric acid, are further added to the water tank (extending tank).
  • the transition metal ion has a weight percentage of about 0.1 ⁇ 3% and the boric acid has a weight percentage of about 1 ⁇ 3%.
  • the extending tank has an operating temperature of about 40 ⁇ 60° C.
  • the dicarboxylic acid In the invention, traditional boric acid bonded to the polyvinyl alcohol film surface is replaced by the dicarboxylic acid, as shown in FIG. 1 .
  • the hydrophilic carboxyl groups of the dicarboxylic acid easily bond to the hydroxyl groups of the polyvinyl alcohol film surface to form ester bonds therebetween.
  • the long-chain dicarboxylic acid having 4 ⁇ 6 carbons is flexible, thus increasing tenacity and extensibility of the thin polarization film, without breakage during stretching.
  • additives such as transition metal ions, hydrochloric acid, sulfuric acid, or boric acid are added to the extending tank.
  • a thin, wide, and high-stretching-ratio polarization film is formed by adjusting various stretching parameters such as operating temperature, extending path, rotation rate of nip roller, and concentrations of dicarboxylic acid and additives.
  • At least one protective film such as triacetyl cellulose (TAC), polyethylene terephthalate(PET), or polynorbornene, is laminated thereto.
  • TAC triacetyl cellulose
  • PET polyethylene terephthalate
  • polynorbornene is laminated thereto.
  • the invention also provides a thin film fabricated by the disclosed method.
  • the thin film is suitable for use in a variety of liquid crystal displays, for example, GPS system screens mounted in cars.
  • the stretched polarization film has a stretching ratio of about 6 ⁇ 9, a thickness of about 10 ⁇ 20 ⁇ m, a thickness ratio (original/stretched) of about 4 ⁇ 8, and a width ratio (original/stretched)-of-about 1.5 ⁇ 2.
  • a polyvinyl alcohol film with 650 mm width and 75 ⁇ m thickness was swollen in a water tank.
  • the polyvinyl alcohol film was dyed with an iodine solution.
  • the polyvinyl alcohol film 30 was stretched in an extending tank 10 containing 3% adipic acid, 1% boric acid, and 0.15% zinc ion to form an extended polyvinyl alcohol polarization film.
  • the rotation rates of the nip rollers 20 were 1:1.5:1.55, respectively, and the extending path was shown in FIG. 3 .
  • the operating temperature was 53° C.
  • a polarization film with a stretching ratio of 7.24, a thickness of 12 ⁇ m, and a width of 380 mm was obtained after being stretched and dried.
  • a polyvinyl alcohol film with 650 mm width and 75 ⁇ m thickness was swollen in a water tank.
  • the polyvinyl alcohol film was dyed with an iodine solution.
  • the polyvinyl alcohol film 30 was stretched in an extending tank 10 containing 3% adipic acid, 1% boric acid, and 0.15% zinc ion to form an extended polyvinyl alcohol polarization film.
  • the rotation rates of the nip rollers 20 were 1:1.45:1.5, respectively, and the extending path was shown in FIG. 3 .
  • the operating temperature was 53° C.
  • a polarization film with a stretching ratio of 6.77, a thickness of 17 ⁇ m, and a width of 342 mm was obtained after being stretched and dried.
  • a polyvinyl alcohol film with 650 mm width and 75 ⁇ m thickness was swollen in a water tank.
  • the polyvinyl alcohol film was dyed with an iodine solution.
  • the polyvinyl alcohol film 60 was stretched in an extending tank 40 containing 3% adipic acid, 1% boric acid, and 0.15% zinc ion to form an extended polyvinyl alcohol polarization film.
  • the rotation rates of the nip rollers 50 were 1:1.5:1.5, respectively, and the extending path was shown in FIG. 4 .
  • the operating temperature was 53° C.
  • a polarization film with a stretching ratio of 7.00, a thickness of 11.5 ⁇ m, and a width of 418 mm was obtained after being stretched and dried.
  • a polyvinyl alcohol film with 650 mm width and 75 ⁇ m thickness was swollen in a water tank.
  • the polyvinyl alcohol film was dyed with an iodine solution.
  • the polyvinyl alcohol film 60 was stretched in an extending tank 40 containing 3% adipic acid, 1% boric acid, and 0.15% zinc ion to form an extended polyvinyl alcohol polarization film.
  • the rotation rates of the nip rollers 50 were 1:1.45:1.5, respectively, and the extending path was shown in FIG. 4 .
  • the operating temperature was 53° C.
  • a polarization film with a stretching ratio of 6.77, a thickness of 14.5 ⁇ m, and a width of 385 mm was obtained after being stretched and dried.
  • the polarization film was then laminated with two TAC films (pre-etched with strong base) and dried at 70° C. to form a polarizer.
  • the polarizer was subjected to thermal mechanical analysis (TMA) at 80° C. for 30 min. Compared to similar samples on market (90 ⁇ 110 ⁇ m), the contraction quantity thereof was 47.93 ⁇ m, as shown in FIG. 2 .
  • a polyvinyl alcohol film with 650 mm width and 75 ⁇ m thickness was swollen in a water tank.
  • the polyvinyl alcohol film was dyed with an iodine solution.
  • the polyvinyl alcohol film was stretched in an extending tank containing 5% boric acid to form an extended polyvinyl alcohol polarization film.
  • the rotation rates of the nip rollers were 1:1.4:1.33, respectively.
  • the operating temperature was 53° C.
  • a polarization film with a stretching ratio of 5.8, a thickness of 24 ⁇ m, and a width of 340 mm was obtained after being stretched and dried.
  • the polarization film provided by the invention has a higher stretching ratio, thickness of only around 10 ⁇ 20 ⁇ m, and increased width after being stretched, thus significantly improving material utilization yield.

Abstract

A thin film. The thin film is fabricated by placing a thin film having a hydroxyl groups-containing surface in a water tank containing dicarboxylic acid and stretching the thin film.

Description

    BACKGROUND
  • The invention relates to a thin film, and more specifically to a thin polarization film and a method of fabricating the same.
  • In recent years, there has been an increasing demand for polarization films because of wide use of liquid crystal displays (LCD) in various apparatuses such as word processors, monitors, cell phones, and liquid crystal televisions. Specifically, larger LCD TVs show a growing trend due to increasing popularity of family entertainment systems. Thus, it is necessary to develop thin and wide polarization films to meet the market requirements.
  • Polyvinyl alcohol (PVA) polarization films are generally categorized into iodine-type films where iodine is adsorbed on a properly oriented PVA film, dye-type films where a dichroic dye is adsorbed rather than iodine, and polyene-type films obtained by partial dehydration.
  • Among these, iodine-type film is most widely used due to ease of manufacture and excellent optical performance. A polarizer generally comprises a central stretched PVA film and at least one protective layer, typically of triacetyl cellulose (TAC). The stretched and dried PVA film is a main polarizing element, with a thickness commonly around 20˜35 μm and a stretching ratio of about 5˜6, most often 5.8. The conventional abovesaid PVA polarization film, however, is thick, narrow, and has a low-stretching-ratio, resulting in low utilization yield thereof, even with an extremely high width ratio (original/stretched) of 2˜2.5, fully unsatisfied to the requirement of large-sized panels.
  • U.S. Pat. No. 6,760,156 and 6,855,276 provide methods for increasing optical properties and uniformity of films by dry processes. A stretching ratio of 5˜7 can be achieved. Few efforts, however, are put to increase the stretching ratio/width and decrease the thickness of the resulted polarizing element. Thus, a thin and high stretching ratio/width stretched PVA film is desired to achieve the maximum material utilization yield.
    • SUMMARY
  • The invention provides a method for fabricating a thin film, in which a thin film having a hydroxyl groups-containing surface is placed and stretched in a water tank containing dicarboxylic acid.
  • The invention also provides a thin film fabricated by the disclosed method.
  • A detailed description is given in the following embodiments with reference to the accompanying drawings.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:
  • FIG. 1 shows chemical bonding between dicarboxylic acid and boric acid and a polyvinyl alcohol film surface.
  • FIG. 2 shows a result of thermal mechanical analysis (TMA) of the polarizer fabricated by example 4 of the invention.
  • FIG. 3 shows an extending path of a polarization film in an extending tank of the invention.
  • FIG. 4 shows another extending path of a polarization film in an extending tank of the invention.
    • DETAILED DESCRIPTION
  • The invention provides a method for fabricating a thin film, in which a thin film having a hydroxyl groups-containing surface is placed and stretched in a water tank containing dicarboxylic acid.
  • The thin film having a hydroxyl groups-containing surface may be a polyvinyl alcohol film.
  • The thin film may further be swollen and dyed with an iodine solution containing molecular iodine and iodide ions. The molecular iodine has a weight percentage of about 0.01˜0.1% and the iodide ions a weight percentage of about 0.1˜10%.
  • The dicarboxylic acid may have 4˜6 carbons, such as an adipic acid. The dicarboxylic acid has a weight percentage of about 1˜10%, preferably 2˜5%. In addition to dicarboxylic acid, transition metal ions such as zinc, hydrochloric acid, sulfuric acid, or boric acid, are further added to the water tank (extending tank). The transition metal ion has a weight percentage of about 0.1˜3% and the boric acid has a weight percentage of about 1˜3%. The extending tank has an operating temperature of about 40˜60° C.
  • In the invention, traditional boric acid bonded to the polyvinyl alcohol film surface is replaced by the dicarboxylic acid, as shown in FIG. 1. The hydrophilic carboxyl groups of the dicarboxylic acid easily bond to the hydroxyl groups of the polyvinyl alcohol film surface to form ester bonds therebetween. Compared to the rigid boric acid, the long-chain dicarboxylic acid having 4˜6 carbons is flexible, thus increasing tenacity and extensibility of the thin polarization film, without breakage during stretching. Also, to improve chemical reactivity and properties of the film stretched and avoid discoloration, additives such as transition metal ions, hydrochloric acid, sulfuric acid, or boric acid are added to the extending tank.
  • A thin, wide, and high-stretching-ratio polarization film is formed by adjusting various stretching parameters such as operating temperature, extending path, rotation rate of nip roller, and concentrations of dicarboxylic acid and additives.
  • After the polarization film is formed, at least one protective film (optical film), such as triacetyl cellulose (TAC), polyethylene terephthalate(PET), or polynorbornene, is laminated thereto.
  • The invention also provides a thin film fabricated by the disclosed method. The thin film is suitable for use in a variety of liquid crystal displays, for example, GPS system screens mounted in cars.
  • The stretched polarization film has a stretching ratio of about 6˜9, a thickness of about 10˜20 μm, a thickness ratio (original/stretched) of about 4˜8, and a width ratio (original/stretched)-of-about 1.5˜2.
    • EXAMPLE 1
  • A polyvinyl alcohol film with 650 mm width and 75 μm thickness was swollen in a water tank. Next, the polyvinyl alcohol film was dyed with an iodine solution. Next, referring to FIG. 3, the polyvinyl alcohol film 30 was stretched in an extending tank 10 containing 3% adipic acid, 1% boric acid, and 0.15% zinc ion to form an extended polyvinyl alcohol polarization film. The rotation rates of the nip rollers 20 were 1:1.5:1.55, respectively, and the extending path was shown in FIG. 3. The operating temperature was 53° C. Finally, a polarization film with a stretching ratio of 7.24, a thickness of 12 μm, and a width of 380 mm was obtained after being stretched and dried.
    • EXAMPLE 2
  • A polyvinyl alcohol film with 650 mm width and 75 μm thickness was swollen in a water tank. Next, the polyvinyl alcohol film was dyed with an iodine solution. Next, referring to FIG. 3, the polyvinyl alcohol film 30 was stretched in an extending tank 10 containing 3% adipic acid, 1% boric acid, and 0.15% zinc ion to form an extended polyvinyl alcohol polarization film. The rotation rates of the nip rollers 20 were 1:1.45:1.5, respectively, and the extending path was shown in FIG. 3. The operating temperature was 53° C. Finally, a polarization film with a stretching ratio of 6.77, a thickness of 17 μm, and a width of 342 mm was obtained after being stretched and dried.
    • EXAMPLE 3
  • A polyvinyl alcohol film with 650 mm width and 75 μm thickness was swollen in a water tank. Next, the polyvinyl alcohol film was dyed with an iodine solution. Next, referring to FIG. 4, the polyvinyl alcohol film 60 was stretched in an extending tank 40 containing 3% adipic acid, 1% boric acid, and 0.15% zinc ion to form an extended polyvinyl alcohol polarization film. The rotation rates of the nip rollers 50 were 1:1.5:1.5, respectively, and the extending path was shown in FIG. 4. The operating temperature was 53° C. Finally, a polarization film with a stretching ratio of 7.00, a thickness of 11.5 μm, and a width of 418 mm was obtained after being stretched and dried.
    • EXAMPLE 4
  • A polyvinyl alcohol film with 650 mm width and 75 μm thickness was swollen in a water tank. Next, the polyvinyl alcohol film was dyed with an iodine solution. Next, referring to FIG. 4, the polyvinyl alcohol film 60 was stretched in an extending tank 40 containing 3% adipic acid, 1% boric acid, and 0.15% zinc ion to form an extended polyvinyl alcohol polarization film. The rotation rates of the nip rollers 50 were 1:1.45:1.5, respectively, and the extending path was shown in FIG. 4. The operating temperature was 53° C. Finally, a polarization film with a stretching ratio of 6.77, a thickness of 14.5 μm, and a width of 385 mm was obtained after being stretched and dried.
  • The polarization film was then laminated with two TAC films (pre-etched with strong base) and dried at 70° C. to form a polarizer. Next, the polarizer was subjected to thermal mechanical analysis (TMA) at 80° C. for 30 min. Compared to similar samples on market (90˜110 μm), the contraction quantity thereof was 47.93 μm, as shown in FIG. 2.
    • COMPARATIVE EXAMPLE 1
  • A polyvinyl alcohol film with 650 mm width and 75 μm thickness was swollen in a water tank. Next, the polyvinyl alcohol film was dyed with an iodine solution. Next, the polyvinyl alcohol film was stretched in an extending tank containing 5% boric acid to form an extended polyvinyl alcohol polarization film. The rotation rates of the nip rollers were 1:1.4:1.33, respectively. The operating temperature was 53° C. Finally, a polarization film with a stretching ratio of 5.8, a thickness of 24 μm, and a width of 340 mm was obtained after being stretched and dried.
  • Stretching ratios, thicknesses, widths, thickness ratios (original/stretched), and width ratios (original/stretched) of various polarization films formed by examples 1˜4 and comparative example 1 are compared in Table 1.
    TABLE 1
    Stretching Thickness
    ratio (μm) Width (mm) RT RW
    Example 1 7.24 12.0 380 6.25 1.72
    Example 2 6.77 17.0 342 4.41 1.89
    Example 3 7.00 11.5 418 6.52 1.56
    Example 4 6.77 14.5 385 5.17 1.69
    Comparative 5.80 24.0 340 3.13 1.91
    Example 1

    RT = thickness ratio (original/stretched)

    RW = width ratio (original/stretched)
  • The results indicate that the polarization film provided by the invention has a higher stretching ratio, thickness of only around 10˜20 μm, and increased width after being stretched, thus significantly improving material utilization yield.
  • While the invention has been described by way of examples and in terms of preferred embodiment, it is to be understood that the invention is not limited thereto. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.

Claims (21)

1. A method for fabricating a thin film, comprising:
placing a thin film having a hydroxyl groups-containing surface in a water tank containing dicarboxylic acid; and
stretching the thin film.
2. The method for fabricating a thin film as claimed in claim 1, further comprising swelling the thin film.
3. The method for fabricating a thin film as claimed in claim 1, further comprising dying the thin film with an iodine solution.
4. The method for fabricating a thin film as claimed in claim 3, wherein the iodine solution comprises molecular iodine and iodide ions.
5. The method for fabricating a thin film as claimed in claim 1, wherein the dicarboxylic acid has 4˜6 carbons.
6. The method for fabricating a thin film as claimed in claim 1, wherein the dicarboxylic acid is adipic acid.
7. The method for fabricating a thin film as claimed in claim 1, wherein the dicarboxylic acid has a weight percentage of about 1˜10%.
8. The method for fabricating a thin film as claimed in claim 1, wherein the dicarboxylic acid has a weight ercentage of about 2˜5%.
9. The method for fabricating a thin film as claimed in claim 1, further comprising adding transition metal ions, hydrochloric acid, sulfuric acid, or boric acid to the water tank.
10. The method for fabricating a thin film as claimed in claim 9, wherein the transition metal ions comprise zinc ions.
11. The method for fabricating a thin film as claimed in claim 9, wherein the transition metal ions have a weight percentage of about 0.1˜3%.
12. The method for fabricating a thin film as claimed in claim 9, wherein the boric acid has a weight percentage of about 1˜3%.
13. The method for fabricating a thin film as claimed in claim 1, wherein the water tank has an operating temperature of about 40˜60° C.
14. The method for fabricating a thin film as claimed in claim 1, further comprising laminating at least one protective film on the thin film.
15. The method for fabricating a thin film as claimed in claim 14, wherein the protective film comprises triacetyl cellulose (TAC), polyethylene terephthalate (PET), or polynorbornene.
16. The method for fabricating a thin film as claimed in claim 1, wherein the thin film has a stretching ratio of about 6˜9.
17. The method for fabricating a thin film as claimed in claim 1, wherein the thin film has a thickness of about 10˜20 μm.
18. The method for fabricating a thin film as claimed in claim 1, wherein the thin film has a thickness ratio (original/stretched) of about 4˜8.
19. The method for fabricating a thin film as claimed in claim 1, wherein the thin film has a width ratio (original/stretched) of about 1.5˜2.
20. The method for fabricating a thin film as claimed in claim 1, wherein the thin film is a polyvinyl alcohol polarization film.
21. A thin film formed by the fabrication method as claimed in claim 1.
US11/397,403 2005-10-27 2006-04-04 Thin films and fabrication method therefor Abandoned US20070096367A1 (en)

Priority Applications (2)

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US11/737,131 US20070187023A1 (en) 2005-11-15 2007-04-18 Method of making a polarizer and polarizing sheet thereof
US11/743,155 US20070200967A1 (en) 2005-11-15 2007-05-02 Method of making a polarizer and method of making a polarizing sheet

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TW094137663A TWI273105B (en) 2005-10-27 2005-10-27 Thin films and method of fabricating the same
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US11/743,155 Continuation-In-Part US20070200967A1 (en) 2005-11-15 2007-05-02 Method of making a polarizer and method of making a polarizing sheet

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Publication number Priority date Publication date Assignee Title
JP5606704B2 (en) * 2009-08-27 2014-10-15 株式会社クラレ Manufacturing method of polarizing film
KR20120002815A (en) * 2010-07-01 2012-01-09 동우 화인켐 주식회사 Method for preparing polarizer
JP5548579B2 (en) * 2010-10-15 2014-07-16 日東電工株式会社 Manufacturing method of polarizing film
JP5548580B2 (en) * 2010-10-18 2014-07-16 日東電工株式会社 Manufacturing method of polarizing film
JP5931125B2 (en) * 2014-06-03 2016-06-08 株式会社クラレ Manufacturing method of polarizing film
CN107667305B (en) 2015-06-03 2020-06-30 株式会社Lg化学 Method for manufacturing polarizer and polarizer manufactured thereby

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US3531351A (en) * 1967-05-01 1970-09-29 Polaroid Corp Preparation of light-polarizing film
US5091458A (en) * 1988-05-11 1992-02-25 Findley Adhesives, Inc. Wood glue
US5874551A (en) * 1996-05-29 1999-02-23 Center For Innovative Technology Method of making ester-crosslinked chitosan support materials and products thereof
US20040119178A1 (en) * 2002-12-05 2004-06-24 Nitto Denko Corporation Method for producing polarizing plate, polarizing plate and image display device using the same
US6760156B2 (en) * 2001-09-20 2004-07-06 Nitto Denko Corporation Process of producing a polarizer, polarizer, polarizing plate, and visual display
US6855276B2 (en) * 2001-04-03 2005-02-15 Nitto Denko Corporation Manufacturing method for oriented film, polarizing film, polarizing plate, and visual display

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3531351A (en) * 1967-05-01 1970-09-29 Polaroid Corp Preparation of light-polarizing film
US5091458A (en) * 1988-05-11 1992-02-25 Findley Adhesives, Inc. Wood glue
US5874551A (en) * 1996-05-29 1999-02-23 Center For Innovative Technology Method of making ester-crosslinked chitosan support materials and products thereof
US6855276B2 (en) * 2001-04-03 2005-02-15 Nitto Denko Corporation Manufacturing method for oriented film, polarizing film, polarizing plate, and visual display
US6760156B2 (en) * 2001-09-20 2004-07-06 Nitto Denko Corporation Process of producing a polarizer, polarizer, polarizing plate, and visual display
US20040119178A1 (en) * 2002-12-05 2004-06-24 Nitto Denko Corporation Method for producing polarizing plate, polarizing plate and image display device using the same

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