WO2006106639A1 - 位相差フィルム、およびその製造方法 - Google Patents
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- WO2006106639A1 WO2006106639A1 PCT/JP2006/306205 JP2006306205W WO2006106639A1 WO 2006106639 A1 WO2006106639 A1 WO 2006106639A1 JP 2006306205 W JP2006306205 W JP 2006306205W WO 2006106639 A1 WO2006106639 A1 WO 2006106639A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
-
- 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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/24—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/10—Esters of organic acids, i.e. acylates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/10—Esters of organic acids, i.e. acylates
- C08L1/14—Mixed esters, e.g. cellulose acetate-butyrate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/26—Cellulose ethers
-
- 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
-
- 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
- B29K2001/00—Use of cellulose, modified cellulose or cellulose derivatives, e.g. viscose, as moulding material
-
- 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
- B29K2001/00—Use of cellulose, modified cellulose or cellulose derivatives, e.g. viscose, as moulding material
- B29K2001/08—Cellulose derivatives
- B29K2001/12—Cellulose acetate
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- 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
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
- B29K2995/0031—Refractive
- B29K2995/0032—Birefringent
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- 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
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
- B29K2995/0034—Polarising
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2301/08—Cellulose derivatives
- C08J2301/10—Esters of organic acids
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/03—Viewing layer characterised by chemical composition
- C09K2323/035—Ester polymer, e.g. polycarbonate, polyacrylate or polyester
Definitions
- the present invention relates to a cellulose-based retardation film having wavelength dispersion of an arbitrary retardation. Furthermore, it is related with the cellulose type phase difference film which shows reverse wavelength dispersion.
- Display devices particularly optical films for liquid crystal display devices, have been required to have more advanced functions as their applications have expanded. Of these requirements, a particularly important requirement is that a longer wavelength has a higher retardation in the visible light region.
- Such an optical film is generally called an inverse wavelength dispersion film because it exhibits a tendency opposite to that of an optical film having a single sheet of force using ordinary resin such as polycarbonate.
- the reverse wavelength dispersion film can be used as a retardation film for converting linearly polarized light into circularly polarized light and circularly polarized light into linearly polarized light in a reflective liquid crystal display device or the like.
- a film containing cellulose acetate is known as a single reverse wavelength dispersion film (see, for example, Patent Document 1).
- cellulose acetate has low solubility in a solvent, the solvent cast method is used. The solvent that can be selected is limited.
- cellulose acetate tends to be difficult to dissolve in methylene chloride, which is generally used in the solvent cast method, and usually cellulose acetate film often uses an excess plasticizer because it is inferior in processability. If an excessive plasticizer is used, there is a problem that the reverse wavelength dispersion becomes small.
- the reverse wavelength dispersion film is expected to be used as a phase difference film for a reflective liquid crystal display device, which is often used outdoors, and as a polarizing plate compensation film for a large screen liquid crystal display device. Also, along with the generalization of liquid crystal display devices, it will be used in various environments. I got it.
- the reverse wavelength dispersion film is preferably less susceptible to cracking due to environmental fluctuations, particularly temperature changes.
- the retardation film disclosed in Patent Document 2 may be problematic in terms of durability of mechanical strength against temperature change.
- Patent Document 1 JP 2000-137116
- Patent Document 2 Japanese Patent Laid-Open No. 2003-315538
- the present invention provides a retardation film having excellent durability against temperature changes and the like, and in particular, provides a retardation film that achieves both reverse wavelength dispersion and durability.
- the present invention relates to a retardation film containing the following component (A) and the following component (B).
- DSac (A) represents the degree of acetyl substitution of the component (A)
- DSay (A) represents the total degree of substitution of the component (A) by the C3 or C4 acyl group.
- the present invention relates to the retardation film according to claim 1, wherein the component (A) satisfies the following formula (2).
- the component (B) is a cellulose sylate satisfying the following formulas (3) and (4), and the components (A) and (B) are represented by the following formula (5) It is related with retardation film characterized by satisfying these.
- the cellulose acylate of component (A) is cellulose acetate propionate satisfying the following formulas (6) and (7):
- the present invention relates to a retardation film, wherein the cellulose acylate as component (B) is a cellulose acetate propionate satisfying the following formulas (8) and (9).
- DSpr (A) indicates the propionyl substitution degree of component (A)
- DSpr (B) indicates the propionyl substitution degree of component (B)
- the present invention relates to a retardation film characterized in that the component (A) and the component (B) satisfy the following formula (10).
- Mn (A) and Mn (B) represent the number average molecular weights of component (A) and component (B), respectively, as determined by gel 'permission' chromatography).
- the present invention relates to a retardation film, wherein the Mn (A) and Mn (B) satisfy the following formulas (11) and (12), respectively.
- Mn (B) 10,000 to 50,000 (12).
- Mw (AB) and Mn (AB) are gel permeation after mixing (A) component and (B) component respectively.
- (A) component content is 20 to 50% by weight
- the present invention relates to a retardation film comprising cellulose acylate.
- a preferred embodiment relates to a phase difference film characterized by satisfying the following formulas (13) and (14).
- Re (450), Re (550), and Re (650) indicate the retardation values at wavelengths of 450 nm, 550 nm, and 650 nm, respectively).
- the present invention relates to an optical compensation polarizing plate containing the retardation film described above.
- an embodiment relates to an optical compensation polarizing plate, wherein the retardation film is directly bonded to a polarizer.
- the present invention is a method for producing the above retardation film, wherein the retardation film is produced by a solution casting method in which a solution containing the component (A) and the component (B) is cast on a support. And a method for producing a retardation film.
- a preferred embodiment relates to a method for producing a retardation film, wherein the solution contains methylene chloride.
- the solvent in the solution is methylene chloride in an amount of 70 to 99% by weight.
- a preferred embodiment relates to a method for producing a retardation film, characterized by stretching in at least a uniaxial direction.
- the retardation film obtained by the method for producing a retardation film described above is bonded to the polarizer via a polarizer protective film and Z or another optical member.
- an optical compensation polarizing plate manufacturing method As a preferred embodiment, the present invention relates to a method for producing an optical compensation polarizing plate, wherein the retardation film obtained by the method for producing a retardation film described above is directly bonded to a polarizer.
- a retardation film excellent in durability against temperature changes and the like can be obtained.
- a phase difference film having both reverse wavelength dispersion and durability can be obtained.
- the retardation film of the present invention is a retardation film containing the following component (A) and the following component (B).
- DSac (A) represents the degree of acetyl substitution of the component (A)
- DSay (A) represents the total degree of substitution of the component (A) by the C3 or C4 acyl group.
- DSac (A) + DSay (A) represents the average amount of the three hydroxyl groups present at positions 2, 3, and 6 in the cellulose molecule.
- the degree of substitution may be equal or may be biased to any position.
- the degree of substitution of the acyl group can be quantified by the method described in ASTM-D817-96.
- Equation (1) The meaning of equation (1) is as follows.
- a film made of cellulose acylate having DSac (A) + DSay (A) of 3 in which all hydroxyl groups are acylated is uniaxially stretched, a negative direction in which the direction perpendicular to the stretching direction is the direction of the slow axis is negative.
- This is a birefringent retardation film.
- the wavelength dispersion of retardation (retardation) of this retardation film tends to have a larger retardation (absolute value) as the wavelength becomes shorter.
- DSac (A) + DSay (A) which shows a constant phase difference regardless of the wavelength, has a force that varies depending on the ratio of DSac (A) and DSay (A), generally in the range of 2.0 to 2.3. is there. Further, when DSac (A) + DSay (A) is further reduced, the phase difference (absolute value) becomes larger as the wavelength becomes shorter, as in the case of the retardation film made of polycarbonate.
- DSac (A) + DSay (A) does not exceed 3, and when the phase difference tends to be larger as the wavelength is shorter, the display quality of the liquid crystal display device deteriorates. Is appropriate, and 2.90 or less is required if negative birefringence is not desired.
- the hydroxyl group of cellulose can be achieved by substitution with a acetyl group or a propionyl group. it can.
- a high-concentration solution can be prepared in order to form a film with good thickness accuracy by the solvent casting method.
- DSay (A) substitution degree
- DSac (A) degree of acyl substitution
- a higher DSay (A) is preferable. That is, it is preferable that the component (A) satisfies the following formula (2).
- component (A) alone may cause a problem in terms of durability of mechanical strength against temperature change (hereinafter abbreviated as durability). Therefore, by containing cellulose acylate having a molecular weight different from that of component (A) and a residual hydroxyl group of 0.30 or more, or cellulose ether as component (B), durability against temperature changes can be improved.
- durability durability of mechanical strength against temperature change
- the cellulose acylate or cellulose ether having a residual hydroxyl group content of 0.30 or more in component (B) is not particularly limited as long as it is compatible with component (A).
- “Compatible” here means that when a film having a thickness of 10 O / zm is produced, the haze is 5% or less when at least the resin in component (B) is contained in an amount of 1% by weight or more.
- the residual hydroxyl group mentioned here is a value obtained by subtracting the total substitution degree of substituents other than the hydroxyl group from 3.
- component (B) is 0.30 or more, but considering solubility, it is preferably 0.30 to L00. If it exceeds 1.00, the solubility is lowered, and it is difficult to obtain a reverse wavelength dispersion film.
- component (B) is cellulose ether, it is preferably ethyl cellulose in which the hydroxyl group of cellulose is substituted with an ethoxyl group in terms of processability and solubility.
- the degree of substitution of the ethoxyl group can be quantified by the method described in ASTM-D4 794-94.
- the cell mouth succinate satisfy the formula (3) and the formula (4) excellent in solubility and compatibility with the component (A). Furthermore, it is preferable that the component (A) and the component (B) satisfy the formula (5) because the expression of the retardation may increase. 2.00 ⁇ DSac (B) + DSay (B) ⁇ 2. 70 (3)
- DSac (B) represents the degree of acetyl substitution of the component (B), and DSay (B) represents the total degree of substitution of the component (B) by the C3 or C4 acyl group.
- acyl group other than the acetyl group a propiol group having 3 or 4 carbon atoms or a petityl group is preferred because it is easily obtained industrially.
- a propionyl group it is preferable in terms of odor. That is, cellulose acylate that can be particularly preferably used for the component (A) and the component (B) is cellulose acetate propionate that satisfies the formulas (6) to (9).
- DSpr (A) is the propionyl substitution degree of component (A)
- DSpr (B) is propionyl of component (B) Indicates the degree of substitution).
- any molecular weight can be used as long as it is not particularly limited. Furthermore, from the viewpoint of durability, it is preferable that the molecular weight of component (B) satisfies the relationship of formula (10).
- Mn (A) and Mn (B) are the number average molecular weights of component (A) and component (B), respectively, as determined by gel 'permission' chromatography).
- the component (A) and the component (B) satisfy the expressions (11) and (12).
- the solubility in a solvent may be lowered, which is preferable.
- the viscosity of the resulting solution may be too high to be suitable for the solvent casting method, and may cause problems such as difficulty in thermoforming.
- the mechanical strength of the obtained film may be lowered, which is not preferable.
- Mn (B) 10,000 to 50,000 (12).
- the molecular weight distribution is not particularly limited, but the molecular weight distribution of component (A) (Mw (A) Z Mn (A)) force 2.5 to 5.0, (B) molecular weight distribution of component (Mw (B) ZMn (B)) is preferably 1.5 to 4.0 and (Mw (A) / Mn (A))> (Mw (AB) / Mn (AB))) Yes. When this condition is satisfied, durability against temperature change is further improved.
- (Mw (AB) and M n (AB) represent the weight average molecular weight and the number average molecular weight according to the gel 'permission' chromatographic method after mixing the components (A) and (B), respectively).
- the content of the component (A) and the component (B) is not particularly limited, but the content of the component (A) is 20 to 50% by weight, and the content of the component (B) is 80 to 50%. % Is preferred. Content power of component (A) and component (B) S Within this range, durability is often improved, which is preferable. This is a surprising finding because the mechanical strength tends to decrease when the content of a compound having a low molecular weight is 50% by weight or more. Furthermore, it is particularly preferable that the content of component (A) is 30 to 40% by weight, and the content of component (B) is 70 to 60% by weight. [0038]
- the retardation film of the present invention is excellent in durability against temperature changes.
- the dimensional change rate at the second time at 40 ° C (at the time of heating) in the direction perpendicular to the stretching direction of the retardation film is 0.5% or more, or 85 ° C (at the temperature rising)
- the (first dimensional change rate) / (second dimensional change rate) is less than 0.90, there is a problem in terms of durability against temperature changes. From room temperature at 25 ° C and humidity of 50%. For example, when an optical compensation polarizing plate is made by laminating with a polarizer, cracks and the like occur due to long-term use.
- component (B) with component (A) the dimensional change rate at the second time at 40 ° C (during temperature rise) was less than 0.5% and 85 ° C (increased).
- (Warm dimensional change rate) / (Second dimensional change rate) can exceed 0.90.
- melt resin is melted and extruded from a T die or the like to form a film, and melted in an organic solvent, cast on a support and heated.
- the solvent cast method which dries a solvent and makes a film
- a solvent with a low boiling point is preferred from the viewpoint of drying efficiency.
- a solvent with a low boiling point of 100 ° C or lower is preferred.
- ketones such as acetone and methyl ethyl ketone
- ester solvents such as ethyl acetate and ethyl propionate
- Halogens such as methylene chloride Hydrocarbon hydrocarbon solvents are suitable solvents because they dissolve the resin material and have a low boiling point.
- methylene chloride is particularly preferable as a main solvent used in the production of the retardation film of the present invention because it has high safety against a fire during drying.
- a mixed solvent containing 70 to 99% by weight of methylene chloride and 1 to 30% by weight of an alcohol having 3 or less carbon atoms provides a good balance between fire safety, solubility and productivity. More preferable.
- ethyl alcohol is preferable because it is safe and has a low boiling point.
- isopropyl alcohol is particularly preferably used from the viewpoint of safety and boiling point.
- the solvent here refers to a solvent having a boiling point lower than the maximum temperature applied to the film in the drying or stretching process, and a liquid having a boiling point higher than the maximum temperature in the drying or stretching process is a plasticizer. .
- the cellulose acylate used in the present invention can be produced by a method known per se.
- the cellulose is treated with a strong caustic soda solution to obtain alkali cellulose, which is acylated with a mixture of acetic anhydride and propionic anhydride.
- the obtained cellulose ester can partially produce a cellulose acetate propionate having a desired degree of substitution by partially hydrolyzing a force group having a degree of substitution DSac + D Spr of about 3.
- the desired degree of propionyl substitution can be obtained.
- ester groups in the molecule increases the hydrophilicity of the polymer, and therefore, if moisture remains in the film, it may have a favorable effect on the strength of the resulting film.
- a small amount of an additive such as a plasticizer, a heat stabilizer, and an ultraviolet stabilizer may be added as necessary.
- an additive such as a plasticizer, a heat stabilizer, and an ultraviolet stabilizer.
- the obtained film is brittle, it is effective to cover a plasticizer for the purpose of improving processing characteristics such as stretching.
- a plasticizer for the purpose of improving processing characteristics such as stretching.
- the glass transition point is obtained. Since control becomes important, it is also preferable to add a plasticizer to adjust the glass transition point.
- the plasticizer has a boiling point higher than the maximum temperature applied to the film in the drying process and the stretching process, and is not particularly limited as long as it is compatible with the component (A).
- conventionally known cellulose resin plasticizers such as castor oil and derivatives thereof, camphor, and the like can be suitably used.
- the addition amount is preferably within 5% by weight of the total solid content.
- a plasticizer having a large number of aromatic rings may act as a retardation increasing agent, making it difficult to obtain desired optical characteristics.
- the plasticizer in the present invention is preferably a phthalic acid ester, particularly jetyl phthalate.
- the components (A) and (B) of the present invention are dissolved in the solvent, cast onto a support, and dried to form a film.
- the preferred viscosity of the solution is from 1 OPa's to 5.0 Pa's, more preferably from 1.5 Pa's to 4.0 Pa's.
- a film such as a stainless steel endless belt, a polyimide film, a biaxially stretched polyethylene terephthalate film, or the like can be used.
- Drying after casting can be performed while being supported on the support. If necessary, the pre-dried film can be peeled off from the support until self-supporting, and further dried. .
- a float method, a tenter or a roll conveying method can be generally used.
- the film itself is subjected to complex stress, and non-uniform optical characteristics are likely to occur.
- the tenter method it is necessary to balance the film width shrinkage due to solvent drying and the tension to support its own weight depending on the distance between the pins or clips that support both ends of the film. Need to do.
- the tension for stable film conveyance is applied in principle in the film flow direction (MD direction), and thus has a characteristic that the stress direction is kept constant. Therefore, the film is most preferably dried by a roll conveyance method. Also when the solvent is dry In order to prevent the film from absorbing moisture, drying in an atmosphere kept at a low humidity is an effective method for obtaining the film of the present invention having high mechanical strength and transparency.
- the thickness of the retardation film of the present invention is preferably 10 ⁇ m force to 500 ⁇ m, more preferably 30 ⁇ m force to 300 ⁇ m.
- the light transmittance of the film is preferably 85% or more, more preferably 90% or more.
- the haze of the film is preferably 5% or less, more preferably 3% or less.
- the film obtained above can be subjected to orientation treatment by a known stretching method to impart a uniform retardation.
- the retardation of the retardation film can be selected from 5 nm to lOOOnm according to the purpose.
- the retardation at a wavelength of 550 nm is Preferably it is 70-155 nm, More preferably, it is 80-150 nm, More preferably, it is 85-145 nm. If the phase difference is within this range, it can be suitably used as a member of an optical compensation polarizing plate.
- the front phase difference Re ( ⁇ ) at the wavelength nm is preferably Re (450) ⁇ Re (550) ⁇ Re (650)! /. If the wavelength dispersion of the phase difference falls outside this range, when the linearly polarized light in the visible light region is incident on this film, the state of the elliptically polarized light obtained varies greatly depending on the wavelength, so that sufficient optical compensation capability is obtained. It may not be possible. In particular, when the following formulas (13) and (14) are satisfied, a high-quality liquid crystal display device can be obtained. If the wavelength dispersion of the phase difference is out of this range, the color shift depending on the viewing angle may become large.
- Re (450), Re (550), and Re (650) indicate the retardation values at wavelengths of 450 nm, 550 nm, and 650 nm, respectively).
- a film at a wavelength of 550 nm When the refractive index in the in-plane slow axis direction is nx and the refractive index in the fast axis direction is ny (nx ⁇ ny), it is preferably 0.0010 or more, more preferably 0.0001 or more. is there. Below the range of (nx-ny) force, the thickness of the film increases, and the film productivity tends to be inferior to that of not being suitable for applications such as mopile. Since the film of the present invention can satisfy these requirements, a retardation film that exhibits reverse wavelength dispersion and has sufficient retardation can be used in the visible light region.
- the refractive index in the three-dimensional direction can be controlled.
- the refractive index in the slow axis direction in the film plane is nx
- the refractive index in the fast axis direction is ny
- the refractive index in the thickness direction is nz
- ⁇ ( ⁇ - ⁇ ) / ( ⁇ ⁇ —ny)
- the range of NZ is preferably 1.00 or more and 1.20 or less, more preferably 1.00 or more and 1.10 or less.
- the retardation and the three-dimensional refractive index can be adjusted to desired values by the stretching method, stretching temperature, stretching ratio, and the like.
- a uniaxial or biaxial thermal stretching method can be employed. Furthermore, it is possible to increase the bending rate in the thickness direction of the film by performing special biaxial stretching as disclosed in JP-A-2001-75098.
- the draw ratio is 1.01 and the force is 4 times
- the draw temperature is preferably (Tg-30) ° C or higher and (Tg + 30) ° C or lower with respect to the glass transition temperature Tg. It is. Particularly preferred stretching temperatures are in the range of (Tg ⁇ 20) ° C or higher and (Tg + 20) ° C or lower, more preferably Tg ⁇ 10) ° C or higher and (Tg + 15 ° C) or lower.
- the drawing temperature here means the maximum temperature in the furnace in which the drawing is not performed, which means that all the temperatures in the furnace in which the drawing is performed must be uniform at this temperature. Other points in the furnace may be out of the temperature range.
- the glass transition temperature can be measured by the method described in JIS K-7121 using differential thermal analysis (DSC).
- the stretching temperature is smaller than the above range, the film tends to break during stretching or the haze tends to increase. If it is larger than the above range, a sufficient phase difference cannot be obtained. By setting it within this temperature range, whitening of the film during stretching can be prevented, and The variation in retardation of the obtained retardation film can be reduced.
- a method of free end uniaxial stretching at a temperature of (Tg + 5) ° C or higher and (Tg + 30) ° C or lower is preferably used.
- Can do As disclosed in Examples of Japanese Patent Application Laid-Open No. 2000-137116, when a film made of a cellulose derivative is generally uniaxially stretched at a free end, the obtained NZ value exceeds 1.20.
- special biaxial stretching as shown in JP-A-5-157911 is required, but heat shrink film bonding is required, and the number of processes increases. Yield tends to be bad and costs tend to increase.
- the NZ range can be controlled to 1.00 or more, 1.20 or less, or even 1.00 or more, 1.10 or less by free end uniaxial stretching by controlling the stretching temperature. This method is preferred in terms of yield improvement and cost reduction by reducing the number of processes.
- a photoelastic coefficient i.e., the rate of change of the birefringence when subjected to stress loading, preferably 20 X 10- 12 m 2 / N or less.
- the photoelastic coefficient is large, unevenness of bonding when bonded together with a liquid crystal layer or a polarizing plate, difference in thermal expansion between constituent materials due to the heat of knock light or external environmental force, contraction of the polarizing film, etc. The change in phase difference due to the effect tends to increase, and the color unevenness of the display device tends to deteriorate or the contrast tends to decrease.
- a polarizer protective film or other optical member may be provided between the polarizer and the retardation film.
- a polarizer and this phase difference film may be pasted together directly. Since this retardation film contains cellulose acylate or cellulose ether and has good adhesion to the polarizer, it is preferably bonded directly to the polarizer as a polarizer protective film with retardation.
- a conventionally known method can be used for the bonding method and the pressure-sensitive adhesive used for the bonding in the method of manufacturing the optical compensation polarizing plate.
- a 50 mm square sample is cut out from the center of the film in the width direction, and the wavelength dispersion of the phase difference is measured with an automatic birefringence meter KOBRA-WR manufactured by Oji Scientific Instruments. Based on the measured value, Re (450 ), Re (550), and Re (650).
- each acyl group was measured by the method described in ASTM-D817-96, and the degree of substitution of the acyl group was calculated.
- the residual hydroxyl group was obtained by calculating 3- (total degree of acyl substitution).
- Each alkoxyl group content was measured by the method described in ASTM-D4794-94, and the degree of substitution of the alkoxy group was calculated.
- the number average molecular weight and weight average molecular weight of each sample were determined by gel permeation chromatography.
- Sample solution A 0.1% concentration methylene chloride solution was filtered through a 0.45 m pore size filter to obtain a sample solution.
- Example 17 parts by weight of a resin mixture was dissolved in 83 parts by weight of methylene chloride as a solvent to prepare a coating solution.
- This solution was a 125 ⁇ m thick biaxially stretched polyethylene terephthalate with a stress of 1.0 X 10 6 NZm 2 applied in the long side direction at room temperature of 23 ° C and humidity of 15%.
- the film was cast on a PET film (with a polyester-based easy-adhesion layer) using a comma coater so that the long side direction of the PET film was the casting direction.
- Comparative Example 1 and Comparative Example 2 the clearance of the comma coater was adjusted so that the film thickness after secondary drying was 100 m, and in Comparative Example 3, it was 50 m. .
- Example 3 Using 0.5 parts by weight of jetyl phthalate as a plasticizer and 15.6 parts by weight of the mixture of rosin, in Example 3, Example 4, Comparative Example 4, and Comparative Example 5, Adjust the clearance of the comma coater so that the thickness of the film is 80 ⁇ m and in Comparative Example 6 it is 40 ⁇ m, and then in a heating furnace with a constant temperature stretched to 136 ° C. Connect a heating furnace at a constant temperature of 146 ° C. A retardation film was produced in the same manner as in Preparation Example (ii) except that the film was continuously passed and the front retardation was 90 nm for light having a wavelength of 550 nm.
- Preparation Example (c) The present invention relates to Example 5, Example 6, and Comparative Examples 7-9.
- Example 5 Methylene chloride 95.0 wt 0/0, ethyl alcohol 4.79 wt 0/0, and a mixed solvent 78 parts by weight was adjusted to isopropyl ⁇ alcohol 0.21% by weight, Jechiru of 0.66 weight parts of the plasticizer
- Example 5 Example 6, Comparative Example 7, and Comparative Example 8
- the film thickness after secondary drying was dissolved by dissolving phthalate and 21.3 parts by weight of the resin mixture.
- the clearance of the comma coater was adjusted so that the thickness was 80 ⁇ m and in Comparative Example 9 it was 40 ⁇ m, and after casting, the drying time was 3 minutes at room temperature, 2 minutes at 60 ° C, A retardation film was produced in the same manner as in the production example (mouth) except that it was shortened to 80 ° C for 2 minutes.
- the direction perpendicular to the stretching direction of the retardation film was the measurement direction, and the width was 3 mm.
- Measurement The sample was heated from 60 ° C to 110 ° C in 10 ° CZ minutes, then at 110 ° C to -60 ° C in 10 ° CZ minutes. Repeated twice to obtain the dimensional change rate at 40 ° C (at elevated temperature) and 85 ° C (at elevated temperature). (The dimensional change rate was 24 hours at room temperature 25 ° C and humidity 50% immediately after creation. (The value after leaving it at 100%)
- Dimensional change rate at the second 40 ° C (at the time of temperature rise) is 0.5 or more, or 85 ° C (at the time of the temperature rise) (the first dimensional change rate) Z (the second dimension) Change rate is 0.90 or less.
- Dimensional change rate at the second 40 ° C is less than 0.5, 0.4 or more, and 85 ° C (during temperature rise) (first dimensional change rate) Z (The second dimensional change rate) is less than 0.95 and 0.90 or more.
- Dimensional change rate at 40 ° C (temperature rise) for the second time is less than 0.4, 0.2 or more, and at 85 ° C (temperature rise) (first time dimensional change rate) Z (The second dimensional change rate) is less than 0.98 and more than 0.95.
- the second dimensional change rate at 40 ° C (temperature rise) is less than 0.2, and the first dimensional change rate at 85 ° C (temperature rise) / (second dimension) (Change rate) is 0.98 or more.
- Table 1 shows the material composition and results in the film.
- the retardation film of the present invention can be suitably used for a display device, particularly an optical film for a liquid crystal display device.
- a display device particularly an optical film for a liquid crystal display device.
- it can be used as a retardation film for a reflection type liquid crystal display device or the like.
- a polarizing plate compensation film Sarakuko can also be used as a polarizer protective film with a phase difference.
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- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
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- Materials Engineering (AREA)
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Abstract
Description
Claims
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KR1020077023902A KR101247827B1 (ko) | 2005-03-31 | 2006-03-28 | 위상차 필름 및 그의 제조 방법 |
CN200680009646XA CN101147086B (zh) | 2005-03-31 | 2006-03-28 | 相位差膜及其制造方法 |
JP2007512523A JP5047784B2 (ja) | 2005-03-31 | 2006-03-28 | 位相差フィルム、およびその製造方法 |
US11/909,868 US8697201B2 (en) | 2005-03-31 | 2006-03-28 | Retardation film and production method thereof |
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JP (1) | JP5047784B2 (ja) |
KR (1) | KR101247827B1 (ja) |
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US20090273837A1 (en) | 2009-11-05 |
US8697201B2 (en) | 2014-04-15 |
CN101147086A (zh) | 2008-03-19 |
KR20070116891A (ko) | 2007-12-11 |
JPWO2006106639A1 (ja) | 2008-09-11 |
TWI407158B (zh) | 2013-09-01 |
JP5047784B2 (ja) | 2012-10-10 |
KR101247827B1 (ko) | 2013-03-26 |
TW200639455A (en) | 2006-11-16 |
CN101147086B (zh) | 2011-02-16 |
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