JP6572081B2 - Cellulose acylate film, polarizing plate and liquid crystal display device - Google Patents

Description

  The present invention relates to a cellulose acylate film, a polarizing plate, and a liquid crystal display device.

  Cellulose acylate films are widely used as films constituting display devices such as liquid crystal display devices. It has been conventionally studied to improve the performance of such a cellulose acylate film (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2014-224963

  Useful applications of the cellulose acylate film include use as a polarizing plate protective film. The polarizing plate includes at least a polarizer, and usually a protective film (polarizing plate protective film) is laminated on one or both surfaces of the polarizer in order to prevent the polarizer from being damaged. In a liquid crystal display device, a polarizing plate plays a role of selectively transmitting light having a polarization plane in a certain direction, and a function for this role is exhibited by a polarizer.

  In recent years, in addition to indoor use, liquid crystal display devices have increased opportunities to be used outdoors (for example, large screen displays and portable devices installed outdoors). Therefore, the polarizing plate constituting the liquid crystal display device has high durability that can withstand use in various environments including outdoors (specifically, even if used in various environments, the above-mentioned role is achieved). (Hereinafter also referred to as “polarizing plate durability”), and there is an increasing need for polarizing plates having extremely excellent polarizing plate durability exceeding the normally required level.

  As a means for improving the durability of the polarizing plate, it is conceivable to increase the durability of the polarizer itself. However, any change to the polarizer (change in composition, change in manufacturing method, etc.) to improve the durability of the polarizer itself may cause changes in the performance of the polarizer. It is not easy to improve durability while maintaining the above. From this point, it can be said that it is desirable that the polarizing plate protective film can contribute to improvement of polarizing plate durability.

  The objective of this invention is providing the cellulose acylate film used as the new means which enables improvement of polarizing plate durability.

One embodiment of the present invention relates to a cellulose acylate film containing a compound having two or more divalent linking groups represented by Formula 1 in one molecule.
Formula ^{1: -NR-C (= X} 1) -X 2 -
(In Formula 1, R represents a hydrogen atom or a substituent, and X ¹ and X ² each independently represent a sulfur atom or an oxygen atom, provided that at least one of X ¹ and X ² represents a sulfur atom.)

  In one embodiment, the compound includes 2 to 6 divalent linking groups represented by Formula 1 in one molecule.

  In one embodiment, the compound has a partial structure in which a divalent linking group represented by Formula 1 is directly connected to an aromatic ring. In the present invention and this specification, with respect to the connection between a certain group or partial structure, “direct connection” means a direct bond without any other atom such as a connection group between those groups or partial structures. It means that you are doing.

  In one embodiment, the compound has a partial structure in which a divalent linking group represented by Formula 1 is directly linked to an aromatic ring at at least one molecular terminal.

  In one embodiment, in the partial structure, the divalent linking group represented by Formula 1 is directly connected to the aromatic ring through the nitrogen atom contained in Formula 1.

  In one embodiment, the aromatic ring is a benzene ring.

In one aspect, the above compound contains, as a divalent linking group represented by Formula 1, a divalent linking group represented by Formula 1 in which X ¹ represents an oxygen atom and X ² represents a sulfur atom in one molecule. Contains at least one.

In one embodiment, the divalent linking group represented by formula 1 contained in the compound is all divalent, wherein X ¹ represents an oxygen atom and X ² represents a sulfur atom. It is a linking group.

In one embodiment, the compound is a divalent linking group represented by formula 1, wherein X ¹ represents an oxygen atom, X ² represents a sulfur atom, and R represents a hydrogen atom. At least one linking group is contained in one molecule.

In one embodiment, in the compound, all of the divalent linking groups represented by formula 1 contained in the compound are all represented by formula 1, wherein X ¹ represents an oxygen atom, X ² represents a sulfur atom, and R represents It is a divalent linking group representing a hydrogen atom.

  In one embodiment, the molecular weight of the compound is 200 or more and 2000 or less.

  In one aspect | mode, the said cellulose acylate film contains 0.1-50.0 mass parts of said compounds with respect to 100.0 mass parts of cellulose acylates.

  The further aspect of this invention is related with the polarizing plate containing the said cellulose acylate film and a polarizer.

  In one aspect, the polarizer is an iodine dyed polyvinyl alcohol film.

  The further aspect of this invention is related with the liquid crystal display device containing the said polarizing plate and a liquid crystal cell.

  In one aspect, the liquid crystal display device includes the polarizing plate as at least a viewing-side polarizing plate.

  According to one embodiment of the present invention, a cellulose acylate film useful as a polarizing plate protective film, a polarizing plate having excellent polarizing plate durability including the film, and a liquid crystal display device including the polarizing plate can be provided.

It is a schematic diagram (partial enlarged view) which shows an example of the casting die used for the manufacturing method (co-casting) of a cellulose acylate film. It is a schematic diagram (partial enlarged view) which shows an example of the manufacturing method (co-casting) of a cellulose acylate film.

  The contents of the present invention will be described in detail below. In the present invention and the present specification, “to” is used to mean that the numerical values described before and after it are included as a lower limit value and an upper limit value. In the present invention and the present specification, a “group” such as an alkyl group may or may not have a substituent unless otherwise specified. Further, in the case of a group having a limited number of carbon atoms, the carbon number means a number including the carbon number of the substituent. Examples of the substituent include various substituents described in the following substituent group T.

Substituent group T:
An alkyl group (preferably having 1 to 20 carbon atoms, more preferably 1 to 12 carbon atoms, particularly preferably 1 to 8 carbon atoms such as a methyl group, an ethyl group, an isopropyl group, a tert-butyl group, an n-octyl group, n-decyl group, n-hexadecyl group, cyclopropyl group, cyclopentyl, cyclohexyl group, etc.), alkenyl group (preferably having 2 to 20 carbon atoms, more preferably 2 to 12, more preferably 2 to 8). For example, a vinyl group, an allyl group, a 2-butenyl group, a 3-pentenyl group, etc.), an alkynyl group (preferably having 2 to 20 carbon atoms, more preferably 2 to 12 carbon atoms, particularly preferably 2 to 2 carbon atoms). 8 such as propargyl group and 3-pentynyl group), aryl group (preferably having 6 to 30 carbon atoms, more preferred) 6 to 20, particularly preferably 6 to 12, and examples thereof include a phenyl group, a biphenyl group, and a naphthyl group.), An amino group (preferably having 0 to 20 carbon atoms, more preferably 0 to 10, Particularly preferably 0 to 6, for example, amino group, methylamino group, dimethylamino group, diethylamino group, dibenzylamino group, etc.), alkoxy group (preferably having 1 to 20 carbon atoms, more preferably 1 to 12, particularly preferably 1 to 8, for example, methoxy group, ethoxy group, butoxy group, etc.), aryloxy group (preferably 6-20 carbon atoms, more preferably 6-16, particularly Preferably they are 6-12, for example, a phenyloxy group, 2-naphthyloxy group etc. are mentioned), an acyl group (preferably carbon atom number). To 20, more preferably 1 to 16, particularly preferably 1 to 12, and examples thereof include an acetyl group, a benzoyl group, a formyl group, and a pivaloyl group), an alkoxycarbonyl group (preferably having 2 to 20 carbon atoms). , More preferably 2 to 16, particularly preferably 2 to 12, and examples thereof include a methoxycarbonyl group and an ethoxycarbonyl group.), An aryloxycarbonyl group (preferably having 7 to 20 carbon atoms, more preferably 7). -16, particularly preferably 7-10, for example, phenyloxycarbonyl group, etc.), acyloxy groups (preferably 2-20 carbon atoms, more preferably 2-16, particularly preferably 2-10). For example, acetoxy group, benzoyloxy group, etc.), acylamino group (preferably The number of carbon atoms is 2 to 20, more preferably 2 to 16, particularly preferably 2 to 10, and examples thereof include an acetylamino group and a benzoylamino group. ), An alkoxycarbonylamino group (preferably having 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, particularly preferably 2 to 12 carbon atoms such as a methoxycarbonylamino group), an aryloxycarbonylamino group ( Preferably it has 7 to 20 carbon atoms, more preferably 7 to 16 and particularly preferably 7 to 12, and examples thereof include a phenyloxycarbonylamino group, and a sulfonylamino group (preferably 1 to 20 carbon atoms). More preferably, it is 1-16, Most preferably, it is 1-12, for example, a methanesulfonylamino group, a benzenesulfonylamino group, etc.), a sulfamoyl group (preferably C0-20, more preferably 0). To 16, particularly preferably 0 to 12, such as sulfamoyl group, methyl Rufamoyl group, dimethylsulfamoyl group, phenylsulfamoyl group, etc.), carbamoyl group (preferably 1-20 carbon atoms, more preferably 1-16, particularly preferably 1-12, for example, Carbamoyl group, methylcarbamoyl group, diethylcarbamoyl group, phenylcarbamoyl group, etc.), alkylthio group (preferably having 1 to 20 carbon atoms, more preferably 1 to 16, particularly preferably 1 to 12, Methylthio group, ethylthio group, etc.), arylthio group (preferably 6-20 carbon atoms, more preferably 6-16, particularly preferably 6-12, such as phenylthio group). A sulfonyl group (preferably having 1 to 20 carbon atoms, more preferably 1 to 16, Is preferably 1 to 12, for example, mesyl group, tosyl group, etc.), sulfinyl group (preferably 1 to 20 carbon atoms, more preferably 1 to 16, particularly preferably 1 to 12, For example, methanesulfinyl group, benzenesulfinyl group, etc.), urethane group, ureido group (preferably 1-20 carbon atoms, more preferably 1-16, particularly preferably 1-12, such as ureido group, Methylureido group, phenylureido group, etc.), phosphoric acid amide group (preferably 1-20 carbon atoms, more preferably 1-16, particularly preferably 1-12, for example diethylphosphoric acid amide, Phenyl phosphoric acid amide, etc.), hydroxy group, mercapto group, halogen atom (eg fluorine atom, chlorine atom) Element, bromine atom, iodine atom), cyano group, sulfo group, carboxyl group, nitro group, hydroxamic acid group, sulfino group, hydrazino group, imino group, heterocyclic group (preferably having 1 to 30 carbon atoms, more preferably 1 to 12 and the hetero atom includes, for example, a nitrogen atom, an oxygen atom, a sulfur atom, specifically an imidazolyl group, a pyridyl group, a quinolyl group, a furyl group, a piperidyl group, a morpholino group, a benzoxazolyl group, Examples thereof include benzimidazolyl group and benzthiazolyl group. ) And a silyl group (preferably having 3 to 40 carbon atoms, more preferably 3 to 30 carbon atoms, particularly preferably 3 to 24 carbon atoms such as a trimethylsilyl group and a triphenylsilyl group).
These substituents may be further substituted. Moreover, when there are two or more substituents, they may be the same or different. If possible, they may be linked together to form a ring.

[Cellulose acylate film]
The cellulose acylate film according to one embodiment of the present invention is a cellulose acylate film containing a compound having two or more divalent linking groups represented by Formula 1 in one molecule.

Formula ^{1: -NR-C (= X} 1) -X 2 -
(In formula 1, R represents a hydrogen atom or a substituent, and X ¹ and X ² each independently represents a sulfur atom or an oxygen atom, provided that at least one of X ¹ and X ² represents a sulfur atom. Contains compounds containing two or more groups per molecule.)

The present inventor believes that the cellulose acylate film can be used as a polarizing plate protective film to improve the durability of the polarizing plate because the divalent linking group represented by Formula 1 is contained in one molecule. By including a compound having two or more, it is assumed that the cellulose acylate film is difficult to contain water (decrease in water content) or difficult to pass water (decrease in moisture permeability). Yes. Thus, the present inventor believes that reducing the moisture that reaches the polarizer from the external atmosphere leads to maintaining the performance of the polarizer, that is, improving the durability of the polarizing plate. Furthermore, regarding the reason why the moisture content and moisture permeability of the cellulose acylate film can be reduced by the above compound, the present inventor has described that the divalent compound represented by Formula 1 contained in two or more molecules of the above compound. This linkage group contributes to increasing the hydrophobicity of the film, and this linkage group interacts with the structure (for example, ester bond, hydroxy group, ether bond in the main chain glucopyranose ring) contained in cellulose acylate. It is presumed that by acting, the film becomes dense and moisture content and moisture permeation are suppressed.
However, the above is only an estimation and does not limit the present invention.

  Below, the said cellulose acylate film is demonstrated in detail.

<Compound having two or more divalent linking groups represented by Formula 1 in one molecule>
The cellulose acylate film has two or more divalent linking groups represented by the following formula 1 in one molecule.

Formula ^{1: -NR-C (= X} 1) -X 2 -

  In Formula 1, R represents a hydrogen atom or a substituent. Examples of the substituent include an alkyl group, an alkenyl group, an aryl group, and an acyl group. R represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkynyl group having 2 to 8 carbon atoms, or an aryl group having 6 to 18 carbon atoms (for example, a benzene ring and naphthalene). Ring group) is preferable, a hydrogen atom or an alkyl group having 1 to 4 carbon atoms is more preferable, and a hydrogen atom is still more preferable.

In Formula 1, X ¹ and X ² each independently represent a sulfur atom or an oxygen atom. However, at least one of X ¹ and X ² represents a sulfur atom. Therefore, Formula 1 becomes any of the following Formula 1-A, Formula 1-B, and Formula 1-C. Formula 1 is preferably Formula 1-C.
Formula 1-A: —NR—C (═S) —S—
Formula 1-B: —NR—C (═S) —O—
Formula 1-C: —NR—C (═O) —S—

  The said compound has 2 or more of bivalent coupling groups represented by Formula 1 in 1 molecule. Thereby, the cellulose acylate film containing the said compound can provide the polarizing plate which is excellent in polarizing plate durability by using this as a polarizing plate protective film. From the viewpoint of compatibility with cellulose acylate, the number of divalent linking groups represented by Formula 1 contained in the compound is preferably 2 to 8 and preferably 2 to 6 in one molecule. Is more preferable, and it is still more preferable that it is 2-4.

(Specific embodiment of a compound having two or more divalent linking groups represented by Formula 1 in one molecule)
Specific examples of the compound include compounds represented by the following general formula (I). Below, the compound represented by general formula (I) is demonstrated. In addition, the description regarding the structure of the compound described below is not limited to the compound represented by the general formula (I) unless otherwise specified, and two divalent linking groups represented by the formula 1 are included in one molecule. This applies to all of the above compounds.

Formula (I)
_{^{Q 1 - (L 12 -L 11}} ) n1 -X 2 -C (= X 1) -NR- (L 21 -L 22) n2 -Q 2
(In General Formula (I), L ¹¹ and L ²¹ each independently represent an alkylene group, and the alkylene group may have a substituent. L ¹² and L ²² each independently represent a single bond or —O —, —NR ¹ —, —S—, —C (═O) —, or a combination thereof, R ¹ represents a hydrogen atom or a substituent, and n1 and n2 are each independently selected. Represents an integer in the range of 0 to 20, and one of n1 and n2 is an integer of 1 or more, and when there are a plurality of L ¹¹ , L ¹² , L ²¹ and L ²² , they are the same or different from each other ^{.Q 1,} Q ² which may .Q ¹ and ^{Q 2} represent each independently a ^{substituent, -L 12 -L 11 -, -} L 21 -L 22 - at least one of the table by the formula 1 At least 1 divalent linking group Included.)

The alkylene group represented by L ¹¹ and L ²¹ may be linear, branched or cyclic, and may be one or more cyclic alkylene groups (cycloalkylene groups) and one or more linear or branched groups. An alkylene group linked to an alkylene group may be used. Specific examples of the linear or branched alkylene group include a methylene group, an ethylene group, a propylene group, a butylene group, a pentylene group, and a hexylene group. The linear or branched alkylene group includes 1 to 1 carbon atoms. 20 alkylene group is preferable, C1-C12 alkylene group is more preferable, C1-C8 alkylene group is still more preferable, C1-C3 alkylene group is especially preferable, a methylene group, ethylene group, or A propylene group is most preferred. The cyclic alkylene group is preferably a cyclohexylene group which may have a substituent. The alkylene group may have a substituent. Examples of the substituent that the alkylene group may have include the substituent group T. Among these, as a substituent which an alkylene group has, an alkyl group, an acyl group, an aryl group, an alkoxy group, and a carbonyl group are preferable.
It is preferable that the linear or branched alkylene group does not have a substituent. The cyclic alkylene group preferably has a substituent.

L ¹² and L ²² each independently represent a single bond or a group consisting of any of —O—, —NR ¹ —, —S—, —C (═O) —, or a combination thereof. An atom, —NR ¹ —, or —C (═O) — is preferable. R ¹ represents a hydrogen atom or a substituent, and examples of the substituent include an alkyl group, an aryl group, and an acyl group, and a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, and an alkynyl group having 2 to 8 carbon atoms. An aryl group having 6 to 18 carbon atoms (for example, a benzene ring or a naphthalene ring group) is preferable, and a hydrogen atom or an alkyl group having 1 to 4 carbon atoms is more preferable.

L ¹² and L ^{22 each} represent, in one embodiment, a single bond, —O— *, —OC (═O) — *, —C (═O) O— *, —NR ¹ — *, —R ¹ N— *. It is preferable that Where * represents a bonding position, or point of attachment with adjacent groups and ^{Q 1} or ^{Q 2} side of the ^{Q 1} or ^{Q 2.}
On the other hand, when L ¹² and L ²² are —OC (═O) — *, —C (═O) O— *, — (L ¹² —L ¹¹ ) — or — (L ²¹ —L ²² ) — is Specific examples of the linking group to be represented include structures represented by the following general formula (2A) or (2C).
Specific examples of the linking group represented by-(L ¹² -L ¹¹ )-or-(L ²¹ -L ²² )-in the case where L ¹² and L ²² are oxygen atoms include the following general formula (2B) The structure represented is illustrated.
In addition, when L ¹² and L ²² are —NR ¹ —OC (═O) — *, —NR ¹ —C (═O) O— *, — (L ¹² —L ¹¹ ) — or — (L ²¹ -L ²²⁾ - specific examples of the linking group represented by the structure represented by the following general formula (2D) or (2E) can be exemplified.
Formula _{^{(2A) - {R b jb}} (CR a R c) ja -O- (C = O)} - *
Formula _{^{(2B) - {R b jb}} (CR a R c) ja -O} - *
Formula _{^{(2C) - {R b jb}} (CR a R c) ja - (C = O) O -} - *
Formula _{^{(2D) - {R b jb}} (CR a R c) ja -NR 1 (C = O) O -} - *
Formula _{^{(2E) - {R b jb}} (CR a R c) ja -O- (C = O) NR 1} - *
(In the general formula (2A) ~ (2E), * represents a bonding position, or point of attachment with adjacent groups and ^{Q 1} or ^{Q 2} side of the ^{Q 1} or ^{Q 2, R a} and R ^c, Each independently represents a hydrogen atom or an alkyl group (for example, an alkyl group having 1 to 3 carbon atoms, preferably a methyl group), and ja represents an integer of 1 or more, preferably an integer in the range of 1 to 3. ^{When a} plurality of ^a and R ^c are present, the plurality of R ^a and R ^c may be the same or different, and R ^b is substituted with one or more alkyl groups having 1 to 3 carbon atoms. Represents a cycloalkylene group, preferably a cyclohexylene group optionally substituted by 1 to 3 alkyl groups having 1 to 3 carbon atoms, and jb is 0 or 1. R ¹ is a hydrogen atom or a substituted group Represents a hydrogen atom or carbon Is preferably a 1-4 alkyl group, the alkyl group may be different even respectively same case, a plurality of R ¹ is more preferably .R ¹ be methyl group there are multiple.)

In the general formulas (2A) to (2E), when two or more structures represented by — (CR ^a R ^c ) — are included, R ^a and R ^c are all hydrogen atoms, or R ^a or R It is preferable that at least one of ^c is an alkyl group.

Specific examples of the linking group represented by the general formula (2A) include
_{-C (CH 3) 2 -O- (} C = O) -,
_{-CH 2 CH 2 -O- (C =} O) -,
_{-CH 2 CH 2 CH 2 -O- (} C = O) -,
_{-CH 2 CH (CH 3) -O-} (C = O) -,
_{-CH (CH 3) CH 2 -O-} (C = O) -,
- (1 to 3 cyclohexylene substituted with alkyl group having 1 to 3 carbon _{atoms) -CH 2 -O- (C = O} ) -,
- (1 to 3 cyclohexylene substituted with alkyl group having 1 to 3 carbon _{atoms) -CH 2 CH 2 -O- (C} = O) -,
- (1 to 3 cyclohexylene substituted with alkyl group having 1 to 3 carbon _{atoms) -CH 2 CH 2 CH 2 -O-} (C = O) -,
- (cyclohexylene substituted with one to three alkyl groups of 1 to 3 carbon atoms xylene _{group) -CH 2 CH (CH 3)} -O- (C = O) -,
- (1 to 3 cyclohexylene substituted with alkyl group having 1 to 3 carbon _{atoms) -CH (CH 3) CH 2} -O- (C = O) -,
Etc.

Specific examples of the linking group represented by the general formula (2B) include a methyleneoxy group, an ethyleneoxy group, a propyleneoxy group, a branched butyleneoxy group, a branched pentyleneoxy group, and a branched hexyleneoxy group. Group,
-C _{(CH 3)} 2 -O-,
- (1 to 3 cyclohexylene substituted with alkyl group having 1 to 3 carbon _atoms) -CH 2 -O-,
- (1 to 3 cyclohexylene substituted with alkyl group having 1 to 3 carbon _atoms) -CH ₂ CH ₂ -O-,
- (1 to 3 cyclohexylene substituted with alkyl group having 1 to 3 carbon _{atoms) -CH 2 CH 2 CH 2 -O-} ,
- (1 to 3 cyclohexylene substituted with alkyl group having 1 to 3 carbon _{atoms) -CH 2 CH (CH 3)} -O-,
- (1 to 3 cyclohexylene substituted with alkyl group having 1 to 3 carbon _{atoms) -CH (CH 3) CH 2} -O-,
Etc.

Specific examples of the linking group represented by the general formula (2C) include
_{-C (CH 3) 2 - (} C = O) -O-,
_{-CH 2 CH 2 - (C =} O) -O-,
_{-CH 2 CH 2 CH 2 - (} C = O) -O-,
_{-CH 2 CH (CH 3) -} (C = O) -O-,
_{-CH (CH 3) CH 2 -} (C = O) -O-,
-(A cyclohexylene group substituted by 1 to 3 carbon atoms having 1 to 3 carbon atoms) -CH _2- (C = O) -O-,
- (1 to 3 cyclohexylene group substituted with an alkyl group having 1 to 3 carbon _{atoms) -CH 2 CH 2 - (C} = O) -O-,
- (1 to 3 cyclohexylene group substituted with an alkyl group having 1 to 3 carbon _{atoms) -CH 2 CH 2 CH 2 -} (C = O) -O-,
- (1 to 3 cyclohexylene group substituted with an alkyl group having 1 to 3 carbon _{atoms) -CH 2 CH (CH 3)} - (C = O) -O-,
- (cyclohexylene group substituted with one to three alkyl groups of 1 to 3 carbon _{atoms) -CH (CH 3) CH 2} - (C = O) -O-,
Etc.

Specific examples of the linking group represented by the general formula (2D) include
— (Cyclohexylene group substituted with 1 to 3 carbon atoms of 1 to 3 alkyl groups) —CH ₂ —NR ¹ (C═O) O—
^{_{-CH 2 -NR 1 (C = O}} ) -O-,
^{_{-CH 2 CH 2 -NR 1 (C}} = O) -O-,
^{_{-CH 2 CH 2 CH 2 -NR 1}} (C = O) -O-,
^{_{-CH 2 CH (CH 3) -NR}} 1 (C = O) -O-,
^{_{-CH (CH 3) CH 2 -NR}} 1 (C = O) -O-,
Etc.

Specific examples of the linking group represented by the general formula (2E) include
— (Cyclohexylene group substituted with 1 to 3 carbon atoms of 1 to 3 alkyl groups) —CH ₂ —O— (C═O) NR ¹ —
^{_{-CH 2 -NR 1 (C = O}} ) -O-,
^{_{-CH 2 CH 2 -NR 1 (C}} = O) -O-,
^{_{-CH 2 CH 2 CH 2 -NR 1}} (C = O) -O-,
^{_{-CH 2 CH (CH 3) -NR}} 1 (C = O) -O-,
^{_{-CH (CH 3) CH 2 -NR}} 1 (C = O) -O-,
Etc.

Preferable embodiments of the linking group represented by (L ¹² -L ¹¹ ) and (L ²¹ -L ²² ) include an alkylene group or a group represented by any one of the general formulas (2A) to (2E). . In one embodiment, a more preferred embodiment includes an alkylene group or a group represented by the general formula (2A) or (2B). In another embodiment, a group represented by the general formula (2D) or (2E) is a more preferable embodiment. Note that (L ¹² -L ¹¹ ) and (L ²¹ -L ²² ) are alkylene groups, that is, L ¹¹ and L ²¹ represent an alkylene group, and L ¹² and L ²² represent a single bond. means. In the general formula (I), when n1 and n2 are integers of 1 or more (that is, an integer in the range of 1 to 5), the general formula (I) includes a plurality of (L ¹² -L ¹¹ ), (L ²¹ -L ²²⁾ are included. In this case, the plurality of (L ¹² -L ¹¹ ) and the plurality of (L ²¹ -L ²² ) may have the same structure or may be different. Preferably, the plurality of (L ¹² -L ¹¹ ) and the plurality of (L ²¹ -L ²² ) include an alkylene group and one or more groups represented by any one of the general formulas (2A) to (2E) It is preferable that the combination of these is included.

Q ¹ and Q ² each independently represent a substituent.
Examples of the substituent include the substituent group T described above, an aryl group having 6 to 30 carbon atoms (more preferably 6 to 20, more preferably 6 to 10), and 1 to 12 carbon atoms (more preferably 1). -10, more preferably 1-5) alkyl group (however, an oxygen atom may be contained in the alkyl chain), carbon number of 1-12 (more preferably 1-10, still more preferably 1-5). ) Alkoxy group. Q ¹ and Q ² may further have a substituent, and specific examples of the substituent include the above substituent group T, and an aryl group, an alkyl group, and an acyl group are preferable. In addition, the said aryl group shall mean an aromatic hydrocarbon group.
In one embodiment, Q ¹ and Q ² preferably include a cyclic structure in one or both. Examples of the cyclic structure included include an aliphatic ring (such as a cyclohexane ring) and an aromatic ring (such as a benzene ring and a naphthalene ring). . When the cyclic structure has a substituent, the substituent is preferably an alkyl group having 1 to 3 carbon atoms or an alkoxy group having 1 to 3 carbon atoms.

When one or both of Q ¹ and Q ² include a cyclic structure, this cyclic structure is preferably an aliphatic carbocyclic ring or an aromatic carbocyclic ring, more preferably a cyclohexane ring or a benzene ring, still more preferably Is a benzene ring.

  The compound having two or more divalent linking groups represented by Formula 1 in one molecule preferably contains 2 to 6 cyclohexane rings or benzene rings (preferably benzene rings) in one molecule. It is preferable that the compound represented by (I) contains 2 to 6 cyclohexane rings or benzene rings (preferably benzene rings) in one molecule.

The cyclic structure is more preferably contained as a molecular end group. The cyclic structure contained as the molecular end group is preferably directly connected to the divalent linking group represented by Formula 1, and the divalent linking group represented by Formula 1 and the nitrogen atom contained in Formula 1 It is preferable that it is directly connected via. That is, a compound having two or more divalent linking groups represented by Formula 1 in one molecule is
(Cyclic ^{structure) -NR-C (= X 1} ) -X 2 -
Is preferably at least one molecular end group, and the cyclic structure is preferably a substituted or unsubstituted cyclohexane ring or benzene ring, more preferably an unsubstituted cyclohexane ring or benzene ring. More preferably, it is a substituted benzene ring. That is, a compound having two or more divalent linking groups represented by the formula 1 in one molecule (preferably a compound represented by the general formula (I)) has the following molecular end groups:
It is preferable that more molecular end groups are the above-mentioned molecular end groups, and it is more preferable that all the molecular end groups are the above-mentioned molecular end groups.

A more preferable embodiment of the molecular end group is the following molecular end group in which X ¹ is an oxygen atom and X ² is a sulfur atom.

A more preferred embodiment of the molecular end group is the following molecular end group in which R is a hydrogen atom.

Or Q ¹ is a monovalent substituent represented by the following general formula (a), or one or more of the monovalent substituents is a substituent bonded to L ¹² via a linking group. It is also preferable that there is.
Formula (a)
_{^{* - (L 12 -L 11)}} n1 -X 2 -C (= X 1) -NR- (L 21 -L 22) n2 -Q 2

Or Q ² is a monovalent substituent represented by the following general formula (b), or one or more of the monovalent substituents is a substituent bonded to L ²² via a linking group. It is also preferable that there is.
General formula (b)
_{^{Q 1 - (L 12 -L 11}} ) n1 -X 2 -C (= X 1) -NR- (L 21 -L 22) n2 - *

That is, the compound represented by the general formula (I) is
_{^{- (L 12 -L 11) n1}} -X 2 -C (= X 1) -NR- (L 21 -L 22) n2 -
It is preferable to have two or more structures represented by In the general formulas (a) and (b), L ^{11 to} L ²² , n1, n2, Q ¹ and Q ² have the same meaning as in the general formula (I). Examples of the linking group include those described for Z ^{1 in} formula (I-1).
n1 and n2 each independently represent an integer in the range of 0 to 20, and one of n1 and n2 is an integer of 1 or more. n1 and n2 are preferably integers in the range of 0 to 10, more preferably in the range of 0 to 5, and still more preferably in the range of 0 to 3.

The compound represented by the general formula (I) is preferably a compound represented by the following general formula (I-1).
Formula (I-1)
_{^{(Q 3 - (L 32 -L}} 31) n3 -A- (L 41 -L 42) n4) m -Z 1
(In General Formula (I-1), L ³¹ and L ⁴¹ each independently represent an alkylene group, and the alkylene group may have a substituent. L ³² and L ⁴² each independently represent a single bond or ^{-O -, - NR 1 -,} - S-, and -C (= O) - .R ¹ represent either or a group comprising a combination of these, the .n3 and n4 represent a hydrogen atom or a substituent Each independently represents an integer in the range of 0-20, and any one of n3 and n4 is an integer of 1 or more, and when there are a plurality of L ³¹ , L ³² , L ^41, and L ⁴² , Q ³ represents a substituent, Z ¹ represents an m-valent linking group, A represents * —X ² —C (═X ¹ ) —NR—, or * —NR—C. ⁽⁼ X 1) -X ² - represents, ^R, X 1, ^{X 2} is 1 synonymous (* is bonding position represents the the L ⁴¹⁾ .m denotes an integer ranging from 2 to 6, is Q ³ and A presence of a plurality of, respectively, may be the same or different .)

L ³¹ and L ⁴¹ are each independently synonymous with L ¹¹ and L ^{21 in} formula (I). At least one of L ^{31 and} L ⁴¹ is preferably an alkylene group having the same meaning as L ¹¹ and L ^{21 in the} general formula (I), and both are alkylene having the same meaning as L ¹¹ and L ²¹ in the general formula (I). More preferably, it is a group.
L ³² and L ⁴² are each independently synonymous with L ¹² and L ²² in the general formula (I), and the preferred range is also the same.
In particular, the linking group represented by (L ⁴¹ -L ⁴² ) is preferably a single bond or an alkylene group, and the linking group represented by (L ³² -L ³¹ ) is a single bond, an alkylene group, or the following general formula (2A) to The group represented by any one of (2E) is preferable. The details of the general formulas (2A) to (2E) are as described above.
Formula _{^{(2A) - {R b jb}} (CR a R c) ja -O- (C = O)} - *
Formula _{^{(2B) - {R b jb}} (CR a R c) ja -O} - *
Formula _{^{(2C) - {R b jb}} (CR a R c) ja - (C = O) O -} - *
Formula _{^{(2D) - {R b jb}} (CR a R c) ja -NR 1 (C = O) O -} - *
Formula _{^{(2E) - {R b jb}} (CR a R c) ja -O- (C = O) NR 1} - *
(In the general formula (2A) ~ (2E), * represents a bonding position, or point of attachment with adjacent groups and ^{Q 3} or ^{Z 1} side to the ^{Q 3} or ^{Z 1,} details such as ^{R a,} As described above.)

n3 and n4 have the same meanings as n1 and n2 in formula (I), and the preferred ranges are also the same.
m represents an integer in the range of 2 to 6, and an integer in the range of 2 to 3 is preferable.

Q ³ represents a substituent, and is preferably a linear or branched alkyl group having 1 to 30 carbon atoms or a cyclic group having 6 to 30 carbon atoms, and preferably comprises only a cyclic group. Q ³ may further have a substituent. Specific examples of the substituent include the substituent group T described above, and an aryl group, an alkyl group, an acyl group, and an alkoxy group are preferable. Q ³ preferably has no substituent.
Cyclic group Q ³ contains may be a condensed ring be monocyclic, towards a single ring. Specific examples include an aliphatic ring (such as a cyclohexane ring) and an aromatic ring (such as a benzene ring and a naphthalene ring). An aromatic ring is preferable, and an aromatic carbocycle is more preferable.
Q ³ is more preferably an aryl having 6 to 30 carbon atoms (more preferably 6 to 20, more preferably 6 to 10), and particularly preferably a benzene ring.
Any one of the m Q ³ preferably includes a ring structure, preferably includes a ring structure, more preferably includes an aromatic group, and further preferably includes a benzene ring (phenyl group).
It is also preferred that at least one of Q ³ and Z ¹ includes one or more cyclic structures.

A represents * —X ² —C (═X ¹ ) —NR—, or * —NR—C (═X ¹ ) —X ² — (* represents a bonding position with L ⁴¹ ). Details of A are as described for Formula 1.

Z ¹ represents an m-valent linking group, preferably a 2- to 6-valent linking group, and more preferably a 2- to 3-valent linking group. Z ¹ is preferably a group containing at least ^one of a linear, branched or cyclic aliphatic group and an aromatic group, and is a group containing at least one of a branched or cyclic aliphatic group and an aromatic group. More preferably. Z ¹ is preferably an alkylene group (for example, an alkylene group having 1 to 10 carbon atoms).
Z ¹ may consist of at least ^one of a linear, branched or cyclic aliphatic group and an aromatic group, or a combination of these groups with an oxygen atom, a linear or branched alkylene group. It is also preferable that there is. The aliphatic group contained as Z ¹ is preferably a saturated aliphatic group.
Number of carbon atoms constituting the Z ¹ is preferably 2 to 20, 3 to 15 is more preferable.
Z ¹ may have a substituent, and specific examples of the substituent include the above-mentioned substituent group T, but preferably no substituent.
Specifically, the linking groups exemplified below are preferable. In addition, * represents the position couple ^| bonded with L41.

The compound represented by the general formula (I-1) preferably includes an aliphatic carbocyclic ring or an aromatic carbocyclic ring as a cyclic structure. In the compound represented by the general formula (I-1), either Q ³ has an aromatic group (preferably a benzene ring), or Z ¹ has a cyclic aliphatic group or an aromatic group. Preferably, each Q ³ is composed of an unsubstituted aromatic group (preferably an unsubstituted benzene ring (phenyl group)), or Z ¹ has a chain or cyclic aliphatic group, more preferably Q ³ Are preferably an unsubstituted aromatic ring group (preferably an unsubstituted benzene ring), or it is more preferable that Z ¹ contains a cyclic aliphatic group or an aromatic group, and Q ³ is an unsubstituted aromatic group. It is particularly preferred that the group consists of an aliphatic group (preferably an unsubstituted benzene ring (phenyl group)), and Z ¹ contains a linear or cyclic aliphatic group or aromatic group.

The compound represented by the general formula (I) is preferably a compound represented by the following general formula (I-2).
Formula (I-2)
_{^{(Q 4 - (L 52 -L}} 51) n5 -A- (L 61 -L 62) n6) m1 -Z 2
(In General Formula (I-2), L ⁵¹ and L ⁶¹ each independently represent an alkylene group, and the alkylene group may have a substituent. L ⁵² and L ⁶² may be a single bond or —O—. , —NR ¹ —, —S—, and —C (═O) —, or a combination thereof, R ¹ represents a hydrogen atom or a substituent, and n5 and n6 each represents 0 Represents an integer in the range of -20, but one of n5 and n6 is an integer of 1 or more, and when a plurality of L ⁵¹ , L ⁵² , L ⁶¹ and L ⁶² are present, they may be the same or different from each other good .Q ⁴ is a substituted or unsubstituted phenyl group, a substituted or unsubstituted cyclohexyl group, a methyl group, an ethyl group, a propyl group, an isopropyl group, or a t- butyl group, Z ² represents a linear, branched or Jo of a group containing at least one of aliphatic and aromatic groups, A ^{is, * - X 2 -C (=} X 1) -NR-, or ^{* -NR-C (= X 1} ) -X ² represents-, R, X ¹ and X ² have the same meanings as in Formula 1 (* represents the bonding position with L ⁶¹ ), m1 represents an integer in the range of 2 to 6, and a plurality of Q ⁴ and A may be the same as or different from each other.)

L ⁵¹ and L ⁶¹ each independently have the same meaning as L ¹¹ and L ^{21 in} formula (I), and the preferred ranges are also the same.
L ⁵² and L ⁶² each independently have the same meaning as L ¹² and L ^{22 in} formula (I), and the preferred range is also the same.
In particular, the linking group represented by (L ⁶¹ -L ⁶² ) is preferably a single bond or an organic group containing an ester bond and / or an ether bond, and more preferably an alkylene group linked to a single bond or an ester bond and / or an ether bond. . The linking group represented by (L ⁵² -L ⁵¹ ) is preferably a single bond, an alkylene group, or a group represented by any of the following general formulas (2A) to (2E). The details of the general formulas (2A) to (2E) are as described above.
Formula _{^{(2A) - {R b jb}} (CR a R c) ja -O- (C = O)} - *
Formula _{^{(2B) - {R b jb}} (CR a R c) ja -O} - *
Formula _{^{(2C) - {R b jb}} (CR a R c) ja - (C = O) O -} - *
Formula _{^{(2D) - {R b jb}} (CR a R c) ja -NR 1 (C = O) O -} - *
Formula _{^{(2E) - {R b jb}} (CR a R c) ja -O- (C = O) NR 1} - *
(In the general formula (2A) ~ (2E), * represents a bonding position, or point of attachment with adjacent groups and ^{Q 4} or ^{Z 2} side of ^{Q 4} or ^{Z 2,} details such as ^{R a,} As described above.)

Q ⁴ represents a substituted or unsubstituted phenyl group, a substituted or unsubstituted cyclohexyl group, a methyl group, an ethyl group, a propyl group, an isopropyl group, or a t-butyl group. In general formula (I-2), m1 represents an integer in the range of 2 to 6, and therefore, a plurality (m) of Q ⁴ exists in the compound represented by general formula (1-2). At least one of the plurality of Q ⁴ and Z ² preferably includes a cyclic structure.

The phenyl group represented by Q ⁴ may have a substituent, may be unsubstituted, and is preferably an unsubstituted phenyl group. The phenyl group is preferably directly connected to the divalent linking group represented by Formula 1, and more preferably directly connected via the nitrogen atom contained in Formula 1.
The cyclohexyl group represented by Q ⁴ may also have a substituent, may be unsubstituted, and is preferably an unsubstituted cyclohexyl group.
Specific examples of the substituent that may be substituted on the phenyl group or the cyclohexyl group include the substituent group T.
There is no restriction | limiting in particular about the substitution position of the substituent group T, Any position of ortho, meta, and para position may be substituted. The substituent is preferably a halogen atom, an alkyl group or an alkoxy group, more preferably an alkyl group having 1 to 3 carbon atoms or an alkoxy group having 1 to 3 carbon atoms.
The Q ^4, unsubstituted phenyl group, an unsubstituted cyclohexyl group or a methyl group, it may be mentioned as preferred examples. If Q ⁴ is a methyl group, L ⁵² is represents -O-, and more preferably a methoxy group is included as a molecular end group.

Z ² is a group containing at least one of a linear, branched or cyclic aliphatic group and an aromatic group. In one embodiment, Z ² is a group containing at least one of a linear, branched or cyclic aliphatic group. It is preferably a group containing a branched or cyclic aliphatic group, more preferably a branched aliphatic group. When Z ² is such a group, the compatibility between the compound represented by formula (I-2) and cellulose acylate is improved, which is preferable from the viewpoint of obtaining a film having excellent transparency. The cyclic structure contained in Z ² is preferably an aliphatic carbocyclic ring or an aromatic carbocyclic ring.
Z ² may consist of at least one of a branched or cyclic aliphatic group and an aromatic group, or may be a combination of these groups with an oxygen atom, a linear or branched alkylene group. preferable. The aliphatic group contained as Z ² is preferably a saturated aliphatic group.
Number of carbon atoms constituting the Z ² is preferably from 3 to 20, 3 to 15 is more preferable.
Z ² may have a substituent, and specific examples of the substituent include the above-described substituent group T, but preferably no substituent.
Specific examples of Z ² include a group containing at least one of a branched or cyclic aliphatic group and an aromatic group in Z ¹ described above.

n5 and n6 are synonymous with n1 and n2 in the general formula (I), and preferred ranges thereof are also the same.
m1 represents an integer in the range of 2-6.

  As a preferable aspect of the compound represented by general formula (I), the compound represented by the following general formula (I-3) can be mentioned.

(In General Formula (I-3), L ⁷¹ and L ⁸¹ each independently represent an alkylene group, and the alkylene group may have a substituent. L ⁷² and L ⁸² each independently represent a single bond or ^{-O -, - NR 1 -,} - S-, and -C (= O) - .R ¹ represent either or a group comprising a combination of these, the .n7 and n8 represents a hydrogen atom or a substituent Each independently represents an integer in the range of 0 to 20, but one of n7 and n8 is an integer of 1 or more, and when there are a plurality of L ⁷¹ , L ⁷² , L ⁸¹ and L ⁸² , they are the same as each other But good .Q ⁵ be different, substituted or unsubstituted phenyl group, a substituted or unsubstituted cyclohexyl group, a methyl group, an ethyl group, .A representing a propyl group, an isopropyl group, or a t- butyl group ^{* -X 2 -C (= X 1} ) -NR-, or ^{* -NR-C (= X 1} ) -X 2 - a represents (* represents a bonding position to ^{L 81), R 2a} the number of carbon atoms 1 to 3 represents an alkyl group, m2 represents an integer of 2 or 3, and a plurality of Q ⁵ and A may be the same as or different from each other, and a represents an integer of 0 to 10. , A is an integer of 1 or more, a plurality of R ^2a may be the same or different from each other.)

L ⁷¹ and L ⁸¹ each independently have the same meaning as L ¹¹ and L ^{21 in} formula (I), and the preferred range is also the same.
L ⁷² and L ⁸² are each independently synonymous with L ¹² and L ^{22 in} formula (I), and the preferred ranges are also the same.
n7 and n8 are each independently synonymous with n1 and n2 in the general formula (I), and preferred ranges thereof are also the same.

The linking group represented by (L ⁷² -L ⁷¹ ) has the same meaning as the linking group represented by (L ⁵² -L ⁵¹ ) in formula (I-2), and the preferred range is also the same.
The linking group represented by (L ⁸¹ -L ⁸² ) has the same meaning as (L ⁶¹ -L ⁶² ) in formula (I-2), and the preferred range is also the same.
Among them, in the general formula (I-3), the linking group represented by (L ⁷² -L ⁷¹ ) and the linking group represented by (L ⁸¹ -L ⁸² ) are, in one embodiment, the above-described general formula (2A) or general formula A linking group represented by (2B) is preferred. In another embodiment, the linking group represented by General Formula (2D) or General Formula (2E) is preferable.

R ^2a represents an alkyl group having 1 to 3 carbon atoms, and examples thereof include a methyl group, an ethyl group, a propyl group, and an isopropyl group. R ^2a is preferably a methyl group.

  m2 represents an integer of 2 or 3, and 2 is preferable. a represents an integer of 0 to 10, and is preferably 0 to 6.

Q ⁵ has the same meaning as Q ^{4 in} formula (I-2), and the preferred range is also the same.

Specific examples of the bonding position of 2 or 3 side chains in the cyclohexane ring in formula (I-3) include the following.
* Below
It is a position to connect to.

  The cyclohexane ring preferably has a structure shown below.

In the general formula (I-3), when Q ⁵ is a substituted or unsubstituted phenyl group, the compound represented by the general formula (I-3) is represented by the following general formula (I-3-1). The

(In General Formula (I-3-1), R ^1a represents an alkyl group having 1 to 3 carbon atoms or an alkoxy group having 1 to 3 carbon atoms. A1 represents an integer in the range of 0 to 5; In the case of an integer of 1 or more, a plurality of R ^1a may be the same or different from each other, and A, L ⁷¹ , L ⁷² , L ⁸¹ , L ⁸² , n7, n8, m2, R ^2a , a are each (It is synonymous with general formula (I-3), and its preferable range is also the same.)

R ^1a represents an alkyl group having 1 to 3 carbon atoms or an alkoxy group having 1 to 3 carbon atoms, and examples thereof include a methyl group, an ethyl group, a propyl group, an isopropyl group, a methoxy group, and an ethoxy group. Group, a methoxy group.

  a1 represents an integer in the range of 0 to 5, preferably 0 to 3, and more preferably 0.

  As a preferable aspect of the compound represented by general formula (I), the compound represented by the following general formula (I-4) can also be mentioned.

In general formula (I-4), Q ⁵ , L ⁷¹ , L ⁷² , L ⁸¹ , L ⁸² , A, n7, n8, and m2 are each synonymous with general formula (I-3). R ^2b represents an alkyl group having 1 to 3 carbon atoms. b represents an integer in the range of 0 to 5. When b is an integer of 1 or more, a plurality of R ^2b may be the same as or different from each other.

In General Formula (I-4), the linking group represented by (L ⁷² -L ⁷¹ ) _n7 is synonymous with the linking group represented by (L ⁵² -L ⁵¹ ) _n5 in General Formula (I-2), and is preferably in a preferred range. Is the same.
In General Formula (I-4), the linking group represented by (L ⁸¹ -L ⁸² ) _n8 has the same meaning as (L ⁶¹ -L ⁶² ) _n6 in General Formula (I-2), and the preferred range is also the same. .
Among them, in the general formula (I-4), the linking group represented by (L ⁷² -L ⁷¹ ) and the linking group represented by (L ⁸¹ -L ⁸² ) are, in one embodiment, the above-described general formula (2A) or general formula A linking group represented by (2B) is preferred. In another embodiment, the linking group represented by General Formula (2D) or General Formula (2E) is preferable.

In general formula (I-4), the preferable ranges of Q ⁵ , A and m2 are the same as those in general formula (I-3).

R ^2b represents an alkyl group having 1 to 3 carbon atoms, and examples thereof include a methyl group, an ethyl group, a propyl group, and an isopropyl group. R ^2b is preferably a methyl group.

  b represents an integer in the range of 0 to 5, more preferably 0 to 2, and still more preferably 0 from the viewpoint of light resistance.

Specific examples of the bonding position of 2 or 3 side chains in the benzene ring in formula (I-4) include the following.
* Below
It is a position to connect to.

In the general formula (I-4), when Q ⁵ is a substituted or unsubstituted phenyl group, the compound represented by the general formula (I-4) is represented by the following general formula (I-4-1). The

(In General Formula (I-4-1), R ^1b represents an alkyl group having 1 to 3 carbon atoms or an alkoxy group having 1 to 3 carbon atoms. B1 represents an integer in the range of 0 to 5, and b1 represents In the case of an integer of 1 or more, a plurality of R ^1b may be the same as or different from each other, L ⁷¹ , L ⁷² , L ⁸¹ , L ⁸² , A, n7, n8, m2, R ^2b , b are each (It is synonymous with general formula (I-4), and its preferable range is also the same.)

R ^1b represents an alkyl group having 1 to 3 carbon atoms or an alkoxy group having 1 to 3 carbon atoms, and examples thereof include a methyl group, an ethyl group, a propyl group, an isopropyl group, a methoxy group, and an ethoxy group. Group, a methoxy group.

  b1 represents the integer of the range of 0-5, 0-3 are preferable and 0 is more preferable.

  As a preferable aspect of the compound represented by general formula (I), the compound represented by the following general formula (I-5) can also be mentioned.

In the general formula (I-5), Q ⁵ , L ⁷¹ , L ⁷² , L ⁸¹ , L ⁸² , A, n7, and n8 are respectively synonymous with the general formula (I-3).

In general formula (I-5), the linking group represented by (L ⁷² -L ⁷¹ ) _n7 has the same meaning as the linking group represented by (L ⁵² -L ⁵¹ ) _n5 in general formula (I-2), and a preferred range Is the same.
In general formula (I-5), the linking group represented by (L ⁸¹ -L ⁸² ) _n8 has the same meaning as (L ⁶¹ -L ⁶² ) _n6 in general formula (I-2), and the preferred range is also the same. .

In general formula (I-5), the preferable ranges of Q ⁵ and A are the same as those in general formula (I-3).

  In general formula (I-5), m3 represents 1 or 2, and is preferably 1.

In general formula (I-5), R ³ and R ⁴ each independently represent a hydrogen atom or a methyl group, R ³ and R ⁴ are a hydrogen atom, or R ³ and R ⁴ are a methyl group. It is preferable.

In General Formula (I-5), a plurality of Q ⁵ , L ⁷¹ , L ⁷² , L ⁸¹ , L ⁸² , A, n7, n8, and m3 may be the same as or different from each other.

  As a preferable aspect of a compound represented by general formula (I-5), the following general formula (I-5-1) can be mentioned.

In general formula (I-5-1), Q ⁵ , L ⁷¹ , L ⁷² , L ⁸¹ , L ⁸² , A, n7, n8, m3, R ³ and R ⁴ are the same as those in general formula (I-5), respectively. It is synonymous and the preferable range is also the same.

  Preferable embodiments of the compound represented by the general formula (I) include a compound represented by the following general formula (II) and a compound represented by the following general formula (III).

(In the general formulas (II) and (III), L ^1a and L ^1b are each independently a single bond, an alkylene group, or a group 1 represented by any one of the general formulas (2A) to (2E)). Or a group consisting of two or three combinations of an alkylene group and a group represented by any of the general formulas (2A) to (2E), Q ^1a and Q ^1b each independently represent a substituent However, at least one of Q ^1a and Q ^1b represents a phenyl group which may be substituted with an alkyl group having 1 to 3 carbon atoms or an alkoxy group having 1 to 3 carbon atoms. In the divalent linking group represented by —NR—C (═X ¹ ) —X ² —, X ¹ and X ² each independently represent a sulfur atom or an oxygen atom, provided that at least one of X ¹ and X ² Is sulfur Representing a child.)

In one embodiment, in general formulas (II) and (III), L ^1a and L ^1b are each independently a single bond, an alkylene group, or any one of the following general formulas (2A-1) to (2E-1) Or a combination of one or more groups represented by any one of the following general formulas (2A-1) to (2E-1) and one or more alkylene groups, such as two or three Represents a group consisting of two combinations.
Formula (2A-1) - {( CR a R c) ja -O- (C = O)} - *
Formula (2B-1) - {( CR a R c) ja -O} - *
Formula (2C-1) - {( CR a R c) ja - (C = O) O -} - *
Formula _{^{(2D-1) - {(}} CR a R c) ja -NR 1 (C = O) O -} - *
Formula _{^{(2E-1) - {(}} CR a R c) ja -O- (C = O) NR 1} - *
(In the formula (2A-1) ~ (2E -1), * ^represents a bonding position or site bonding with adjacent groups and ^{Q 1a} or ^{Q 1b} side of ^{Q 1a} or ^{Q 1b, R a} and R ^c each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, ja represents an integer of 1 or more, R ^a, if R ^c there are a plurality, the plurality of R ^a, and R ^c each identical good .R ¹ be different even represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, if R ¹ there are a plurality, the plurality of R ¹ each optionally substituted by one or more identical Good.)

L ^1a and L ^1b each independently represent a single bond, an alkylene group, one of the groups represented by any of the following general formulas (2A-1) to (2E-1), or the following general formula (2A-1) ) To (2E-1) and a group consisting of a combination of two or more of the alkylene group and, for example, two or three. Ra in formula (2A-1) ~ (2E -1), the R ^{c, R} 1, niv is the same as Ra, R ^{c, R} 1, niv in formula (2A) ~ (2E).
Examples of the alkylene group include a methylene group and an ethylene group.
L ^1a and L ^1b are represented by one of the groups represented by any one of the general formulas (2A-1) to (2E-1) and any one of the general formulas (2A-1) to (2E-1). Or a combination of one or more groups represented by any one of the following general formulas (2A-1) to (2E-1) and one or more alkylene groups A group consisting of The combination is, for example, a combination of two or three of the above groups.

Q ^1a and Q ^1b each independently represent a substituent, and examples of the substituent include the substituent group T. ^Provided that at least one of ^{Q 1a} and ^{Q 1b,} an alkyl group or a phenyl group which may be substituted by an alkoxy group having 1 to 3 carbon atoms having 1 to 3 carbon ^atoms, both ^{Q 1a} and ^{Q 1b} is, It preferably represents a phenyl group which may be substituted by an alkyl group having 1 to 3 carbon atoms or an alkoxy group having 1 to 3 carbon atoms. More preferably, both Q ^1a and Q ^1b are unsubstituted phenyl groups.

The details of the alkyl group having 1 to 3 carbon atoms and the alkoxy group having 1 to 3 carbon atoms for substituting the phenyl group are as described for R ^1a in formula (I-3-1).

  For the group represented by any one of the general formulas (2A-1) to (2C-1) included in the general formula (II), ja preferably represents an integer of 2 or more, and an integer in the range of 2 to 5 Is more preferable, and 2 or 3 is still more preferable. jc preferably represents an integer in the range of 1 to 3, and more preferably 1 or 2.

  Preferable embodiments of the compound represented by the general formula (II) include the following general formula (II-1).

(In General Formula (II-1), L ^11a and L ^11b are each independently a single bond, an alkylene group, or a group represented by any one of the following General Formulas (2A-1) to (2E-1) 1, group consisting of a combination of two or more groups represented by any one of the following general formulas (2A-1) to (2E-1), or the following general formulas (2A-1) to (2E-1) Represents a group consisting of a combination of one or more groups represented by any one of the above and one or more alkylene groups, Q ^11a and Q ^11b each independently represent a substituent, provided that Q ^11a and Q ^11b At least one represents a phenyl group which may be substituted with an alkyl group having 1 to 3 carbon atoms or an alkoxy group having 1 to 3 carbon atoms.
Formula (2A-1) - {( CR a R c) ja -O- (C = O)} - *
Formula (2B-1) - {( CR a R c) ja -O} - *
Formula (2C-1) - {( CR a R c) ja - (C = O) O -} - *
Formula _{^{(2D-1) - {(}} CR a R c) ja -NR 1 (C = O) O -} - *
Formula _{^{(2E-1) - {(}} CR a R c) ja -O- (C = O) NR 1} - *
(In the formula (2A-1) ~ (2E -1), * ^represents a bonding position or site bonding with adjacent groups and ^{Q 11a} or ^{Q 11b} side of the ^{Q 11a} or ^{Q 11b, R a} and R each ^c independently represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, R ¹ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, ja represents an integer of 1 or more, R ^a , In the case where a plurality of R ^c and R ¹ are present, the plurality of R ^a , R ^c and R ¹ may be the same or different from each other: Formula 1: —NR— included in Formula (II-1) In the divalent linking group represented by C (= X ¹ ) —X ² —, X ¹ and X ² each independently represent a sulfur atom or an oxygen atom, provided that at least one of X ¹ and X ² is a sulfur atom. Represents.)

In general formula (II-1), the details of Q ^11a , Q ^11b , L ^11a , and L ^11b are the same as Q ^1a , Q ^1b , L ^1a , and L ^{1b in} general formula (II), respectively.

In one embodiment, L ^11a and L ^11b each independently represent one of the groups represented by any of the following general formulas (2A-1) to (2E-1), the following general formula (2A-1) to (2E-1) a group consisting of two or more combinations of groups represented by any one, or one or more groups represented by any one of the following general formulas (2A-1) to (2E-1) And a group consisting of a combination of one or more alkylene groups. The combination consists of two or three combinations of the above-mentioned groups, for example.

  Preferred embodiments of the compound represented by the general formula (III) include the following general formula (III-1).

(In General Formula (III-1), L ^11a and L ^11b are each independently a single bond, an alkylene group, or any one of the following General Formulas (2A-1) or (2C-1) to (2E-1) One group represented by the following general formula (2A-1) or a group consisting of a combination of two or more groups represented by any one of (2C-1) to (2E-1), or the following general formula It represents a group comprising a combination of formula (2A-1) or (2C-1) ~ (2E -1) 1 or more 1 or more and an alkylene group of the group represented by any ^{one, Q 11a} and Q ^11b independently represents a substituent, provided that at least one of Q ^11a and Q ^11b represents a phenyl group which may be substituted with an alkyl group having 1 to 3 carbon atoms or an alkoxy group having 1 to 3 carbon atoms. .
Formula _{^{(2A-1) - {(}} CHR a) ja -O- (C = O)} jc - *
Formula _{^{(2C-1) - {(}} CHR a) ja - (C = O) O-} jc - *
Formula _{^{(2D-1) - {(}} CR a R c) ja -NR 1 (C = O) O -} - *
Formula _{^{(2E-1) - {(}} CR a R c) ja -O- (C = O) NR 1} - *
In the formula (2A-1), (2C -1) ~ (2E-1), * ^represents a bonding position or site bonding with adjacent groups and ^{Q 11a} or ^{Q 11b} side of the ^{Q 11a} or ^{Q 11b} , R ^a and R ^{c each} represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, ja represents an integer of 1 or more, R ¹ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, R ^a , R ^c , and R ¹ , a plurality of R ^a , R ^c , and R ¹ may be the same or different. In the divalent linking group represented by the formula 1: —NR—C (═X ¹ ) —X ² — contained in the general formula (III-1), X ¹ and X ² are each independently a sulfur atom or oxygen. Represents an atom, provided that at least one of X ¹ and X ² represents a sulfur atom. )

In general formula (III-1), the details of Q ^11a , Q ^11b , L ^11a , and L ^11b are the same as Q ^1a , Q ^1b , L ^1a , and L ^{1b in} general formula (III), respectively.

In one embodiment, L ^11a and L ^11b each independently represent one of the groups represented by any of the following general formulas (2A-1) to (2E-1), the following general formula (2A-1) to (2E-1) a group consisting of two or more combinations of groups represented by any one, or one or more groups represented by any one of the following general formulas (2A-1) to (2E-1) And a group consisting of a combination of one or more alkylene groups. The combination consists of two or three combinations of the above-mentioned groups, for example.

  Furthermore, specific examples of the compound having two or more divalent linking groups represented by Formula 1 in one molecule include the following compounds A to E.

  Specific examples of the compound having two or more divalent linking groups represented by Formula 1 in one molecule include the following compounds.

As a preferable aspect of the said compound, the compound which satisfy | fills at least 1 of following (1)-(6) can be mentioned, The compound which satisfy | fills more in following (1)-(6) is more preferable.
(1) Among the divalent linking groups represented by Formula 1, at least one is a divalent linking group represented by Formula 1-C, and preferably more is represented by Formula 1-C. It is a divalent linking group, and most preferably all are divalent linking groups represented by the formula 1-C.
(2) 2 to 6 divalent linking groups represented by Formula 1 are contained in one molecule.
(3) The divalent linking group represented by Formula 1 has a partial structure directly connected to the aromatic ring, and preferably has this partial structure at the molecular end.
(4) The divalent linking group represented by formula 1 has a partial structure directly connected to the aromatic ring via the nitrogen atom contained in formula 1, and preferably has this partial structure at the molecular end.
(5) In the above (3) and (4), the aromatic ring is a benzene ring.
(6) At least one molecular end group has the following molecular end groups:
And preferably the following molecular end groups:
And more preferably the following molecular end groups:
It is preferable that more molecular end groups are the molecular end groups, and it is more preferable that all the molecular end groups are the molecular end groups.

The molecular weight of the compound having two or more divalent linking groups represented by Formula 1 in a molecule is preferably 2000 or less, and preferably 1500 or less, from the viewpoint of compatibility with cellulose acylate. More preferably, it is still more preferably 1000 or less. Further, from the viewpoint of low volatility, the molecular weight is preferably 200 or more, and more preferably 300 or more.
When the above compound is a polymer, the molecular weight means a weight average molecular weight unless otherwise specified. The average molecular weight (weight average molecular weight, number average molecular weight) in the present invention and the present specification refers to a value measured in terms of polystyrene by gel permeation chromatography (GPC). Examples of specific measurement conditions include the following measurement conditions. The average molecular weight shown in the below-mentioned examples is a value measured under the following conditions.
GPC device: HLC-8320 (manufactured by Tosoh Corporation):
Column: TSK gel SuperHZM-H, TSK gel SuperHZ4000, TSK gel SuperHZ2000 combined use (manufactured by Tosoh, 4.6 mm ID (inner diameter) x 15.0 cm)
Eluent: Tetrahydrofuran (THF)

The above compound can be produced by a known method.
For example, it can be obtained by addition reaction of thiol to alkyl or aryl isocyanate, condensation reaction of amine and carbonate.
It is also preferable to use a catalyst in the addition reaction of thiol to alkyl or aryl isocyanate. As the catalyst, conventionally known urethanization catalysts such as amines, metal organic acid salts such as zinc and tin, metal chelate compounds, and organic metal compounds such as zinc, tin and bismuth can be used. As the urethanization catalyst, for example, dibutyltin dilaurate, dibutyltin diacetate and the like are preferably used.

  As the compound, any combination of a polyvalent isocyanate (diisocyanate, triisocyanate, etc.) and a monovalent thiol and a combination of a polyvalent thiol and a monovalent isocyanate can be preferably used.

Examples of polyvalent isocyanates include aliphatic diisocyanates such as ethylene diisocyanate, trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, p-phenylene diisocyanate, tolylene diisocyanate, p · p'-diphenylmethane. Examples include, but are not limited to, diisocyanates, aromatic diisocyanates such as 1,5-naphthylene diisocyanate, and m-xylylene diisocyanate. Of these, aliphatic diisocyanate and m-xylylene diisocyanate in which the conjugated system is cut are preferable from the viewpoint of suppression of photocoloring.
Examples of monovalent isocyanate components include, but are not limited to, phenyl isocyanate, benzyl isocyanate, butyl isocyanate, and the like.
Examples of polyvalent thiols include ethylene dithiol, diethylene dithiol, triethylene glycol, tetraethylene glycol, 1,2-propanedithiol, 1,3-propanedithiol, 1,3-butanedithiol, 1,4-butanedithiol, Examples thereof include 1,5-pentanedithiol, 1,6-hexanedithiol, trimethylolpropane, trimethylolethane, thioglycerin and the like.

(Content)
The cellulose acylate film contains 0.1 to 50 parts of a compound having two or more divalent linking groups represented by the formula 1 described above in one molecule with respect to 100.0 parts by mass of cellulose acylate. 0.0 part by mass, preferably 0.5-30.0 parts by mass, more preferably 1.0-20.0 parts by mass, and more preferably 2.0-15.0 parts by mass. Is particularly preferred. About the aspect which uses together 2 or more types of compounds as said compound, said content shall say the total amount of 2 or more types of compounds.

<Cellulose acylate>
A cellulose acylate film contains a cellulose acylate with the said compound. In the cellulose acylate film, the component (main component) occupying the most is preferably cellulose acylate. The cellulose acylate content of the cellulose acylate film can be, for example, about 50 to 95% by mass with respect to the film mass, but is not limited thereto.

As the cellulose acylate, a known cellulose acylate used for producing a cellulose acylate film can be used without any limitation. The degree of substitution of cellulose acylate means the ratio of acylation of three hydroxy groups present in the structural unit of cellulose (glucose having a (β) 1,4-glycoside bond). The degree of substitution (acylation degree) can be calculated by measuring the amount of bound fatty acid (or bound carboxylic acid) per unit mass of cellulose. In the present invention and this specification, the degree of substitution of the cellulose body is determined by measuring the ¹³ C-NMR spectrum by dissolving the cellulose body in a solvent such as dimethyl sulfoxide substituted with deuterium, and measuring the peak of the carbonyl carbon in the acyl group. It can be calculated by obtaining from the intensity ratio. It can be determined by ¹³ C-NMR measurement after substituting the remaining hydroxy group of cellulose acylate with another acyl group different from the acyl group of cellulose acylate itself. Details of the measurement method are described in Tezuka et al. (Carbohydrate. Res., 273 (1995) 83-91).

  The substitution degree of cellulose acylate is preferably 1.50 or more and 3.00 or less, more preferably 2.00 to 2.97, and further preferably 2.30 or more and less than 2.97. It is particularly preferably 2.30 to 2.95.

In the cellulose acetate using only acetyl group as the acyl group of cellulose acylate, the degree of substitution is preferably 2.00 or more and 3.00 or less, more preferably 2.20 to 3.00. It is preferably 2.30 to 3.00, more preferably 2.30 to 2.97, and particularly preferably 2.30 to 2.95.
As the acyl group of cellulose acylate, an acetyl group, a propionyl group, and a butyryl group are preferable, and an acetyl group is more preferable.

A mixed fatty acid ester composed of two or more acyl groups can also be preferably used as the cellulose acylate in one embodiment of the present invention. Also in this case, the acyl group is preferably an acetyl group and an acyl group having 3 to 4 carbon atoms. Moreover, when using mixed fatty acid ester, when an acetyl group is included as an acyl group, the substitution degree is preferably less than 2.5, and more preferably less than 1.9. On the other hand, the substitution degree in the case of containing an acyl group having 3 to 4 carbon atoms is preferably 0.1 to 1.5, more preferably 0.2 to 1.2, and 0.5 to 1 .1 is particularly preferred.
In one embodiment of the present invention, two types of cellulose acylates having different substituents and / or degree of substitution may be used in combination or mixed, or different cellulose acylates may be used by the co-casting method described later. You may form the film which consists of several layers which consist of.

  Furthermore, mixed acid esters having fatty acid acyl groups and substituted or unsubstituted aromatic acyl groups described in paragraphs 0023 to 0038 of JP-A-2008-20896 can also be preferably used in one embodiment of the present invention.

  The cellulose acylate preferably has a weight average degree of polymerization of 250 to 800, and more preferably has a weight average degree of polymerization of 300 to 600. In addition, the cellulose acylate used in one embodiment of the present invention preferably has a number average molecular weight of 40000 to 230,000, more preferably 60000 to 230,000, and a number average molecular weight of 75000 to 200000. Most preferred.

  Cellulose acylate can be synthesized using an acid anhydride or acid chloride as an acylating agent. When the acylating agent is an acid anhydride, an organic acid (for example, acetic acid) or methylene chloride is used as a reaction solvent. Further, a protic catalyst such as sulfuric acid can be used as the catalyst. When the acylating agent is an acid chloride, a basic compound can be used as a catalyst. In the most common synthetic method in the industry, cellulose is an organic acid corresponding to acetyl group and other acyl groups (acetic acid, propionic acid, butyric acid) or their acid anhydrides (acetic anhydride, propionic anhydride, butyric anhydride). Cellulose acylate is synthesized by esterification with a mixed organic acid component containing.

  In the above method, cellulose such as cotton linter and wood pulp is activated with an organic acid such as acetic acid, and then in the presence of a sulfuric acid catalyst, the mixture of organic acid components as described above is used. Often esterified. The organic acid anhydride component is generally used in excess relative to the amount of hydroxy groups present in the cellulose. In this esterification treatment, in addition to the esterification reaction, a hydrolysis reaction (depolymerization reaction) of the cellulose main chain (β) 1,4-glycoside bond) proceeds. When the hydrolysis reaction of the main chain proceeds, the degree of polymerization of the cellulose acylate is lowered, and the physical properties of the cellulose acylate film to be produced are lowered. For this reason, the reaction conditions such as the reaction temperature are preferably determined in consideration of the degree of polymerization and molecular weight of the cellulose acylate obtained.

<Additives optionally contained in cellulose acylate film>
The cellulose acylate film may contain other additives in addition to the compound and cellulose acylate. Examples of the additive include known plasticizers, organic acids, dyes, polymers, retardation adjusting agents, ultraviolet absorbers, antioxidants, matting agents, and the like. About these, description of Paragraph Nos. 0062-0097 of JP, 2012-155287, A can be referred to, and these contents are built into this specification. Examples of the additive include a peeling accelerator, an organic acid, and a polyvalent carboxylic acid derivative. Regarding these, the description of International Publication WO2015 / 005398, paragraphs 0212 to 0219 can be referred to, and the contents thereof are incorporated in the present specification.
The content of additives (when the cellulose acylate film contains two or more additives, the total content thereof) is 50.0 parts by mass or less with respect to 100.0 parts by mass of cellulose acylate. Preferably, it is 30.0 parts by mass or less.

(Plasticizer)
One preferred additive is a plasticizer. By adding a plasticizer, the hydrophobicity of the cellulose acylate film can be further increased. The molecular weight of the plasticizer is preferably 3000 or less, more preferably 1500 or less, and still more preferably 1000 or less, from the viewpoint of obtaining the above-described effect by adding it satisfactorily. The molecular weight of the plasticizer is, for example, 300 or more, preferably 350 or more, from the viewpoint of low volatility. As for the plasticizer for the polymer, the molecular weight means the number average molecular weight.

  As the plasticizer, a polyhydric ester compound of polyhydric alcohol (hereinafter also referred to as “polyhydric alcohol ester plasticizer”), a polycondensed ester compound (hereinafter also referred to as “polycondensed ester plasticizer”), And carbohydrate compounds (hereinafter also referred to as “carbohydrate derivative plasticizers”). For polyhydric alcohol ester plasticizers, paragraphs 0081 to 0098 of JP2014-077130, for polycondensed ester plasticizers, paragraphs 00099 to 0124, and for carbohydrate derivative plasticizers, paragraphs 0125 to 0140 of the publication. You can refer to it. The content of these plasticizers is 1.0 to 20.0 parts by mass with respect to 100.0 parts by mass of cellulose acylate from the viewpoint of achieving both the effect of adding the plasticizer and suppressing the precipitation of the plasticizer. Is preferable, 2.0 to 15.0 parts by mass is more preferable, and 5.0 to 15.0 parts by mass is still more preferable.

(Antioxidant)
One preferable additive may include an antioxidant. Regarding the antioxidant, the description of International Publication WO2015 / 005398, paragraphs 0143 to 0165 can be referred to, and the contents thereof are incorporated in the present specification.

(Radical scavenger)
One preferred additive is a radical scavenger. Regarding the radical scavenger, the description in paragraphs 0166 to 0199 of International Publication No. WO2015 / 005398 can be referred to, and the contents thereof are incorporated herein.

(Deterioration inhibitor)
As one of preferable additives, a deterioration preventing agent can be mentioned. Regarding the deterioration preventing agent, the description in paragraphs 0205 to 0206 of International Publication No. WO2015 / 005398 can be referred to, and the contents thereof are incorporated herein.

(Barbituric acid compound)
The cellulose acylate film may also contain a compound having a barbituric acid structure (barbituric acid compound). A barbituric acid compound is a compound which can express various functions in a cellulose acylate film by adding this compound. For example, a barbituric acid compound is effective for improving the hardness of a cellulose acylate film. The barbituric acid compound is also effective in improving the durability against light, heat, humidity and the like of a polarizing plate provided with a cellulose acylate film containing this compound. About the barbituric acid compound which can be added to the said cellulose acylate film, description of the international publication WO2015 / 005398 paragraph 0029-0060 paragraph can be referred, for example, These content is integrated in this specification.

<Method for producing cellulose acylate film>
The method for producing the cellulose acylate film is not particularly limited, but it is preferably produced by a melt film formation method or a solution film formation method (solvent cast method). It is more preferable to manufacture by a film forming method (solvent cast method). Examples of production of a cellulose acylate film using a solvent cast method are described in U.S. Pat. Nos. 2,336,310, 2,367,603, 2,492,078, and 2,492. No. 977, No. 2,492,978, No. 2,607,704, No. 2,739,069 and No. 2,739,070, British Patent No. 640731 and Refer to each specification of No. 736892, and Japanese Patent Publication Nos. 45-4554, 49-5614, JP-A-60-176634, 60-203430 and 62-1115035. Can do. Further, the cellulose acylate film may be subjected to a stretching treatment.

(Casting method)
As a solution casting method, a method in which the prepared dope is uniformly extruded from a pressure die onto a metal support, and a method using a doctor blade in which the dope once cast on the metal support is adjusted with a blade is used. There is a method using a reverse roll coater that adjusts with a reverse rotating roll, and a method using a pressure die is preferable. The pressure die includes a coat hanger type and a T die type, and any of them can be preferably used. In addition to the methods mentioned here, it can be carried out by various known methods for casting a polymer solution, and each condition is set in consideration of differences in the boiling point of the solvent used. be able to.

-Co-casting In the formation of the cellulose acylate film, it is preferable to use a lamination casting method such as a co-casting method, a sequential casting method, a coating method, etc., particularly simultaneous co-casting (also called simultaneous multi-layer co-casting). .) Method is particularly preferred from the viewpoints of stable production and production cost reduction.
When manufacturing by the co-casting method and the sequential casting method, first, a cellulose acetate solution (dope) for each layer is prepared. In the co-casting method (multi-layer simultaneous casting), the dope for casting of each layer (which may be three layers or more) is simultaneously pressed from another slit or the like on a casting support (band or drum). This is a casting method in which the dope is extruded from the casting gies to be cast, and each layer is cast at the same time. Using a co-casting giusa, three layers of the surface layer dope and the core layer dope can be extruded simultaneously on the casting support. FIG. 1 is a schematic diagram showing an example of a casting die used for co-casting. FIG. 2 is a schematic diagram (partially enlarged view) showing an example of co-casting. When casting the dope, as shown in FIG. 1, the dope is cast from the casting die 89 on the traveling band 85 so as to have a three-layer structure of skin layer A / core layer / skin layer B. As shown in FIG. 2, co-casting (simultaneous multilayer casting) can be performed. The core layer refers to a layer located in the center in a three-layer structure, and the skin layers A and B refer to layers located outside in a three-layer structure.

In the sequential casting method, the casting dope for the first layer is first extruded from the casting giusa on the casting support, cast, and dried on the second layer without drying or drying. The dope for casting is extruded from the casting gear, and if necessary, the dope is successively cast and laminated to the third layer or more, and peeled off from the support at an appropriate time and dried. This is a casting method for forming a cellulose acylate film. In general, the core layer is formed into a film by a solution casting method, a coating solution is prepared to be applied to the surface layer, and the core layer is applied to each side or both sides simultaneously using an appropriate applicator. In this method, a liquid is applied and dried to form a cellulose acylate film having a laminated structure.
A compound having two or more divalent linking groups represented by the above formula 1 in one molecule can be contained in any one or more of these layers or all layers to obtain a cellulose acylate film. .

(Extension process)
In the manufacturing method of a cellulose acylate film, it is preferable to include the process of extending | stretching formed into a film. The stretching direction of the cellulose acylate film is preferably either the cellulose acylate film transport direction (MD (Machine Direction) direction) or the direction orthogonal to the transport direction (TD (Transverse Direction) direction), but in the cellulose acylate film transport direction. An orthogonal direction (TD direction) is particularly preferable from the viewpoint of a polarizing plate processing process using a subsequent cellulose acylate film. In addition, you may perform a extending | stretching process in multiple steps in two steps or more.

  Methods for stretching in the TD direction are described in, for example, JP-A-62-115035, JP-A-4-152125, JP-A-2842211, JP-A-298310, and JP-A-11-48271. Yes. In the case of stretching in the MD direction, for example, if the speed of the cellulose acylate film is adjusted so that the take-up speed of the cellulose acylate film is higher than the speed of peeling off the cellulose acylate film, the cellulose acylate film Is stretched. In the case of stretching in the TD direction, the cellulose acylate film can also be stretched by conveying while holding the width of the cellulose acylate film with a tenter and gradually increasing the width of the tenter. After the cellulose acylate film is dried, it can be stretched using a stretching machine (preferably uniaxial stretching using a long stretching machine).

  When the cellulose acylate film is used as a protective film for a polarizer (polarizing plate protective film), in order to suppress light leakage when the polarizing plate is viewed from an oblique direction, the transmission axis of the polarizer and the cellulose acylate film An embodiment in which in-plane slow axes are arranged in parallel is also preferred. Since the transmission axis of the roll film-like polarizer produced continuously is generally parallel to the width direction of the roll film, it is composed of the roll film-like polarizer and the roll film-like cellulose acylate film. In order to continuously bond the protective film, the in-plane slow axis of the roll film-shaped protective film needs to be parallel to the width direction of the cellulose acylate film. Therefore, it is also preferable to stretch more in the TD direction. The stretching process may be performed in the middle of the film forming process, or the original fabric that has been formed and wound may be stretched.

  The stretching in the TD direction is preferably 5 to 100%, more preferably 5 to 80%, particularly preferably 5 to 40%. In addition, unstretched means that stretching is 0%. The stretching process may be performed in the middle of the film forming process, or the original fabric that has been formed and wound may be stretched. In the former case, stretching may be performed in a state including the residual solvent amount, and the residual solvent amount = (residual volatile matter mass / heat-treated film mass) × 100% is preferably stretched at 0.05 to 50%. be able to. It is particularly preferable to perform 5 to 80% stretching in a state where the residual solvent amount is 0.05 to 5%.

<Physical properties of cellulose acylate film>
(Moisture content)
The moisture content of the cellulose acylate film can be evaluated by measuring the equilibrium moisture content at a constant temperature and humidity. The equilibrium moisture content is calculated by measuring the moisture content of the sample that has reached equilibrium after being allowed to stand at a constant temperature and humidity for 24 hours, and dividing the moisture content (g) by the sample mass (g). .
The moisture content of the cellulose acylate film at a temperature of 25 ° C. and a relative humidity of 80% is preferably 3.3% by mass or less, more preferably 3.0% by mass or less, still more preferably less than 3.0% by mass. 0.7 mass% or less is more preferable, and 2.5 mass% or less is even more preferable. The lower limit of the moisture content is, for example, 0.1% by mass or more, but is not particularly limited. A compound having two or more divalent linking groups represented by Formula 1 in one molecule can exert an effect of reducing the water content of the cellulose acylate film as compared with the case where this compound is not included. . The present inventors speculate that this is one of the reasons that the durability of the polarizing plate can be improved by using a cellulose acylate film containing the above compound as a polarizing plate protective film.

(Moisture permeability)
The moisture permeability of the cellulose acylate film is determined by measuring the mass of water vapor passing through the sample in 24 hours in an atmosphere at a temperature of 40 ° C. and a relative humidity of 90% according to JIS Z0208 moisture permeability test (cup method). it can be obtained as a value in terms of the mass of water vapor passing through the 24-hour per 1 m ^2.
Moisture permeability of the cellulose acylate film is preferably 500~1000g ^/ m 2 · day, more preferably from 500~940g ^/ m 2 · day, it is 500~920g ^/ m 2 · day Particularly preferred.
A compound having two or more divalent linking groups represented by Formula 1 in one molecule can exert an effect of lowering the moisture permeability of the cellulose acylate film as compared with a case where this compound is not included. . The present inventors presume that this point is one of the reasons why the durability of the polarizing plate can be improved by using a cellulose acylate film containing the above compound as a polarizing plate protective film.

(Film thickness)
The film thickness of a cellulose acylate film can be suitably determined according to the application, and is, for example, 5 to 100 μm. When the thickness is 5 μm or more, the handling property when producing a web-like film is improved, which is preferable. Moreover, by setting it as 100 micrometers or less, it becomes easy to respond to a humidity change and it becomes easy to maintain an optical characteristic. As for the film thickness of a cellulose acylate film, 8-80 micrometers is more preferable, and 10-70 micrometers is still more preferable.
Moreover, when the cellulose acylate film has a laminated structure of three or more layers, the thickness of the core layer is preferably from 3 to 70 μm, more preferably from 5 to 60 μm. Further, when the cellulose acylate film has a three-layer structure, the thickness of the skin layer A and the skin layer B is preferably 0.5 to 20 μm, more preferably 0.5 to 10 μm, and more preferably 0.5 to 3 μm. Further preferred.

(width)
When producing a cellulose acylate film, the width is preferably 700 to 3000 mm, more preferably 1000 to 2800 mm, and particularly preferably 1300 to 2500 mm.

(Saponification treatment)
The cellulose acylate film can be used as a polarizing plate protective film by imparting adhesion to a polarizer material such as polyvinyl alcohol by alkali saponification treatment.
As a saponification method, for example, the methods described in paragraphs 0211 and 0212 of JP-A-2007-86748 can be used.

  For example, the alkali saponification treatment for the cellulose acylate film is preferably performed in a cycle in which the film surface is immersed in an alkali solution, neutralized with an acidic solution, washed with water and dried. Examples of the alkaline solution include a potassium hydroxide solution and a sodium hydroxide solution, and the concentration of hydroxide ions is preferably in the range of 0.1 to 5.0 mol / L, and preferably 0.5 to 4.0 mol / L. More preferably, it is in the range of L. The alkaline solution temperature is preferably in the range of room temperature to 90 ° C, and more preferably in the range of 40 to 70 ° C.

  Alternatively, instead of the alkali saponification treatment, easy adhesion processing as described in JP-A-6-94915 and JP-A-6-118232 may be applied to the cellulose acylate film.

(Rth / d)
In one embodiment, a compound having two or more divalent linking groups represented by Formula 1 in a molecule can also act as a retardation adjusting agent (retardation increasing agent) in a cellulose acylate film. it can. By adding this compound to the cellulose acylate film, the retardation Rth in the film thickness direction can be increased as compared with the case where it is not added. It should be noted that subjecting the cellulose acylate film to stretching is effective in further improving Rth.
In one embodiment, the cellulose acylate film has a value Rth / d obtained by dividing the value of retardation Rth (unit: nm) in the film thickness direction at a wavelength of 590 nm by the film thickness d (unit: μm) of the film. It is preferably 0 or more, more preferably 1.5 or more, and still more preferably 2.0 or more. Rth / d is, for example, 5.0 or less, but is not limited thereto.

The retardation Rth in the film thickness direction is a value determined by the following method. As described above, Rth for obtaining Rth / d in the present invention is Rth at a wavelength of 590 nm. In the following, Re (λ) and Rth (λ) respectively represent in-plane retardation and retardation in the film thickness direction at wavelength λ.
Re (λ) is measured by making light having a wavelength of λ nm incident in the normal direction of the film in KOBRA 21ADH (manufactured by Oji Scientific Instruments). In selecting the measurement wavelength λnm, the wavelength selection filter can be exchanged manually, or the measurement value can be converted by a program or the like. Rth (λ) is the above-mentioned Re (λ), with the in-plane slow axis (determined by KOBRA 21ADH) as the tilt axis (rotation axis) (in the absence of the slow axis, any direction in the film plane) Is measured in 6 points from the inclined direction in 10 degree steps from the normal direction to 50 degrees on one side with respect to the normal direction of the film. KOBRA 21ADH calculates based on the retardation value, the assumed average refractive index, and the input film thickness value. The retardation value is measured from any two directions with the slow axis as the tilt axis (rotation axis) (in the absence of the slow axis, the arbitrary direction in the film plane is the rotation axis), and the value Rth can also be calculated from the following formula (A) and formula (B) based on the assumed average refractive index and the input film thickness value. Here, as the assumed value of the average refractive index, values in the polymer handbook (John Wiley & Sons, Inc.) and catalogs of various optical films can be used. Those whose average refractive index is not known can be measured with an Abbe refractometer. The average refractive index of cellulose acylate is 1.48. The KOBRA 21ADH calculates nx, ny, and nz by inputting the assumed value of the average refractive index and the film thickness. Nz = (nx−nz) / (nx−ny) is further calculated from the calculated nx, ny, and nz.

Here, Re (θ) represents a retardation value in a direction inclined by an angle θ from the normal direction, nx, ny, and nz represent refractive indexes in respective principal axis directions of the refractive index ellipsoid, and d represents a film. Represents thickness.
Rth = ((nx + ny) / 2−nz) × d Formula (B)
At this time, an average refractive index n is required as a parameter, and a value measured by an Abbe refractometer (“Abbe refractometer 2-T” manufactured by Atago Co., Ltd.) was used.

In addition, the values of Re (λ) and Rth (λ) are measured by using a measurement apparatus using three or more different wavelengths (for example, λ = 479.2, 546.3, 628.3, 745.3 nm) It is assumed that Re and Rth are calculated from each wavelength. These values are approximated by Cauchy's equation (up to the third term, Re = A + B / λ ² + C / λ ⁴ ) to obtain values A, B, and C. From the above, Re and Rth at the wavelength λ can be re-plotted, and Re (λ) and Rth (λ) at each wavelength λ can be obtained therefrom.
Retardation can also be measured using AxoScan OPMF-1 (manufactured by Optoscience) or AxoScan (AXOMETRICS).

[Polarizer]
(Configuration of polarizing plate)
The polarizing plate concerning one mode of the present invention has the above-mentioned cellulose acylate film and light polarizer.
In one aspect, the polarizing plate includes a polarizer and one polarizing plate protective film for protecting one side of the polarizer, or at least one of the cellulose acylate films, the polarizing plate protective film. Can have as.
In addition, the liquid crystal display device usually has a configuration in which a liquid crystal cell is disposed between the viewing side polarizing plate and the backlight side polarizing plate. In the viewing side polarizing plate and the backlight side polarizing plate, the polarizing plate protective film located between the polarizing plate and the liquid crystal cell is the inner side protective film, and the protective film located on the side opposite to the inner side is the outer side protective film. When it says, the above-mentioned cellulose acylate film can be used also as any protective film of the inner side of a visual recognition side polarizing plate, an outer side, the inner side of a backlight side polarizing plate, and an outer side.
Therefore, in one aspect, the cellulose acylate film is included in the liquid crystal display device as an outer-side polarizing plate protective film positioned on the surface opposite to the surface facing the liquid crystal cell of the polarizer.
Moreover, in another one aspect | mode, the said cellulose acylate film is contained in a liquid crystal display device as an inner side polarizing plate protective film located between a polarizer and a liquid crystal cell.
The cellulose acylate film is considered to have an effect of reducing moisture reaching the polarizer from the outside atmosphere, and from the viewpoint of effectively exhibiting such an effect, it should be included as a protective film for the viewing side polarizing plate. It is more preferable that it is included as an outer protective film for the viewing side polarizing plate.

  Along with the cellulose acylate film, other film members can be used as a polarizing plate protective film. Other film members used in this case are not particularly limited, and various film members usually used as a polarizing plate protective film can be used.

  Moreover, as a polarizer, an iodine dyeing polyvinyl alcohol film can be used, for example. As such a film, for example, a film obtained by immersing and stretching a polyvinyl alcohol film in an iodine solution can be used. When using a polarizer obtained by immersing and stretching a polyvinyl alcohol film in an iodine solution, for example, the saponification surface of the cellulose acylate film can be directly bonded to at least one surface of the polarizer using an adhesive. . In the present invention and the present specification, the term “adhesive” is used to include an adhesive and a pressure-sensitive adhesive. As the adhesive, an aqueous solution of polyvinyl alcohol or polyvinyl acetal (for example, polyvinyl butyral), a latex of a vinyl polymer (for example, polybutyl acrylate), or an ultraviolet curable adhesive can be used. A particularly preferred adhesive is an aqueous solution of fully saponified polyvinyl alcohol.

The polarizing plate protective film is preferably bonded to the polarizer so that the transmission axis of the polarizer and the slow axis of the polarizing plate protective film are substantially parallel, orthogonal or 45 °. The slow axis can be measured by various known methods, for example, using a birefringence meter (KOBRADH, manufactured by Oji Scientific Instruments).
Here, substantially parallel, orthogonal or 45 ° means that the deviation between the direction of the main refractive index nx of the polarizing plate protective film and the direction of the transmission axis of the polarizing plate is within 5 °. It is preferable that the angle is within 1 °, preferably within 0.5 °. If the deviation is within 1 °, the polarization degree performance under the polarizing plate crossed Nicol is unlikely to deteriorate, and light leakage is less likely to occur.

(Multi-functionalization of polarizing plate)
The polarizing plate is an antireflection film for improving the visibility of a liquid crystal display device, a brightness enhancement film, a hard coat layer, a forward scattering layer, an antiglare (antiglare) layer, etc., without departing from the spirit of the present invention. It can also be used as a functionalized polarizing plate combined with an optical film having a functional layer. Details of these can be referred to the descriptions in paragraphs 0229 to 0242, paragraphs 0249 to 0250 and paragraphs 0086 to 0103 in JP 2012-215812 A, and the contents thereof are incorporated in the present specification. It is.

  As an example, a hard coat layer will be described below.

(Hard coat layer)
If desired, a hard coat layer can be provided on the cellulose acylate film. For example, the hard coat layer can be formed on the cellulose acylate film by applying the coating composition onto the cellulose acylate film and curing it. By adding fillers and additives to the hard coat layer, chemical performance such as mechanical, electrical and optical physical performance and water / oil repellency can be imparted to the hard coat layer. The thickness of the hard coat layer is preferably in the range of 0.1 to 6 μm, and more preferably in the range of 3 to 6 μm. By having a thin hard coat layer in such a range, it is possible to obtain a polarizing plate including a hard coat layer that has improved physical properties such as brittleness and curl suppression, reduced weight, and reduced manufacturing costs.

  An example of the coating composition for forming the hard coat layer contains a monomer or oligomer for matrix forming binder, a polymer and an organic solvent. A hard coat layer can be formed by curing the coating composition after coating. For curing, a crosslinking reaction or a polymerization reaction can be used. Details of these can be referred to the description in paragraphs 0088 to 0101 of JP2012-215812A, the contents of which are incorporated herein.

  The coating composition can be prepared, for example, by dissolving and / or dispersing the above-described components in an organic solvent. A coating composition suitable for forming the hard coat layer is a curable composition containing a (meth) acrylate compound. The (meth) acrylate compound includes an acrylic compound and a methacrylic compound.

[Liquid Crystal Display]
A liquid crystal display device according to one embodiment of the present invention includes at least one polarizing plate according to one embodiment of the present invention. Details of the liquid crystal display device can be referred to the descriptions in paragraphs 0251 to 0260 of JP2012-082235A, and the contents thereof are incorporated in this specification. The polarizing plate can be used as any polarizing plate of a viewing side polarizing plate and a backlight side polarizing plate. In one embodiment, it is preferable to use the polarizing plate as at least the viewing side polarizing plate.

Although not illustrated, as another configuration, as a part of a circularly polarizing plate arranged as an antireflection application of a self-luminous element such as a reflective or transflective liquid crystal display device or organic EL (Electro Luminescence) The polarizing plate according to one embodiment of the present invention can also be used.
In addition, since the cellulose acylate film according to one embodiment of the present invention can exert an effect of reducing the influence of moisture, it is not limited to a polarizing plate protective film, but is used for various applications where it is desirable to reduce the influence of moisture. It is also useful as a film.

The present invention will be described more specifically with reference to the following examples. The materials, amounts used, ratios, processing details, processing procedures, and the like shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below.
All synthesized compounds were identified by using ¹ H-NMR (Nuclear Magnetic Resonance) (300 MHz) and infrared spectroscopy (IR).

[Examples of compound synthesis]
<Synthesis of Exemplified Compound A>
In a three-necked flask (300 ml) with a condenser, 30.0 g of hexamethylene diisocyanate (manufactured by Wako Pure Chemical Industries), 32.8 g of methoxyethanethiol (manufactured by Santa Cruz Biotech) and 100 g of tetrahydrofuran (manufactured by Wako Pure Chemical Industries) are placed under a nitrogen stream. Then, 1 mg of bismuth catalyst (Neostan U-600 manufactured by Nitto Kasei) was added to the solution stirred at room temperature, and the liquid temperature was raised to 50 ° C., followed by stirring for 48 hours. At this time, the equivalent when the reaction of isocyanate (NCO) and thiol (SH) was charged was 1. Thereafter, the reaction solution was allowed to cool to room temperature and poured into 2 L of separately stirred water to precipitate the target solid. The precipitated solid was separated by filtration, and the obtained solid was dried under normal pressure (101.33 kPa) and an ambient temperature of 50 ° C. for 48 hours to obtain Illustrative Compound A solid.

<Synthesis of Exemplified Compounds B to E and Comparative Compounds F to H>
Exemplified compounds B to E and comparative compounds F to H were synthesized by the same synthesis method as that of exemplified compound A, except that the types of thiol (or alcohol) and isocyanate as raw materials were changed. In addition, in the synthesis | combination of any compound, the equivalent at the time of the reaction preparation of isocyanate and thiol (or alcohol) was made to become 1.

The structures of exemplary compounds A to E are as described above. Comparative compounds F to H are compounds having the following structures.
It was confirmed by ¹ H-NMR spectrum and IR spectrum that the solid obtained by synthesis was the target product.

[Film formation of cellulose acylate film]
<Preparation of cellulose acylate solution>
The following composition is put into a mixing tank, stirred to dissolve each component, further heated at a liquid temperature of 90 ° C. for about 10 minutes, and then sequentially filtered through a filter paper having an average pore size of 34 μm and a sintered metal filter having an average pore size of 10 μm. Then, a cellulose acylate solution I was prepared.

―――――――――――――――――――――――――――――――――――――
Composition of cellulose acylate solution I ――――――――――――――――――――――――――――――――――――――
Cellulose acylate (degree of substitution 2.88, number average molecular weight 163000)
100.0 parts by mass Compounds listed in Table 1 9.0 parts by mass polycondensation ester plasticizer S3 5.0 parts by mass Methylene chloride 451.0 parts by mass Methanol 39.0 parts by mass ――――――――― ―――――――――――――――――――――――――――

Polycondensation ester plasticizer S3:
Adipic acid: ethanediol = 100: 100 (molar ratio) polycondensed ester compound (no end-capping, hydroxyl value 112 mgKOH / g, number average molecular weight: 1000)

<Preparation of matting agent dispersion>
Next, the following composition containing the cellulose acylate solution prepared by the above method was charged into a disperser to prepare a mat agent dispersion.
―――――――――――――――――――――――――――――――――――――
Composition of matting agent dispersion ―――――――――――――――――――――――――――――――――――――
-Matting agent (Aerosil (registered trademark) R972 manufactured by Nippon Aerosil Co., Ltd.) 0.2 parts by mass-Methylene chloride 72.4 parts by mass-Methanol 10.8 parts by mass-Cellulose acylate solution I 10.3 parts by mass ―――――――――――――――――――――――――――――――――

<Preparation of dope for film formation>
The cellulose acylate solution I was mixed in an amount of 100 parts by mass, and the matting agent dispersion was mixed with the cellulose acylate resin in an amount such that the matting agent fine particles were 0.20 parts by mass to prepare a dope for film formation.

<Casting>
The film-forming dope was cast using a band casting machine. The band was made of stainless steel (SUS; Steel Special Use Stainless).

<Dry>
The web (film) obtained by casting was peeled off from the band, and then dried for 20 minutes in a tenter device (temperature in the device: 100 ° C.) using a tenter device that holds and conveys both ends of the web with clips. .
Thereafter, the web was further dried by carrying it through a drying zone at a drying temperature of 120 ° C.
In this way, the cellulose acylate film with a film thickness of 60 micrometers of Examples 1-3, 5, 6 and Comparative Examples 1-4 was obtained.
In the cellulose acylate film of Example 4, the web obtained by casting was gripped with a clip, and stretched in the transverse direction under the condition of a uniaxial fixed end. In addition, the atmospheric temperature at the time of extending | stretching was 180 degreeC, and the extending | stretching rate was 30%. The film thickness of the obtained film was 60 μm.

[Preparation of polarizing plate]
<Saponification treatment of polarizing plate protective film>
The cellulose acylate films of Examples and Comparative Examples were immersed in a 2.3 mol / L sodium hydroxide aqueous solution (liquid temperature 55 ° C.) for 3 minutes. It wash | cleaned in the room temperature water bath, and neutralized using 0.05 mol / L sulfuric acid at the liquid temperature of 30 degreeC. Again, it was washed in a water bath at room temperature and further dried with hot air at 100 ° C. Thus, the surface saponification process was performed with respect to the cellulose acylate film.

<Production of polarizer>
A 75 μm-thick polyvinyl alcohol film (9X75RS manufactured by Kuraray Co., Ltd.) is continuously conveyed by a guide roll, immersed in a 30 ° C. water bath to swell 1.5 times, and stretched twice by stretching. After the magnification, it is immersed in a dyeing bath (30 ° C.) containing iodine and potassium iodide, dyeing treatment and stretching treatment to obtain a drawing magnification of 3 times, and then it is added with boric acid and potassium iodide. The film was subjected to crosslinking treatment in a bath (60 ° C.) and stretched to a draw ratio of 6.5 times and dried in an atmosphere at an atmosphere temperature of 50 ° C. for 5 minutes to obtain a polarizer having a thickness of 20 μm.

<Lamination of polarizer and polarizing plate protective film>
The saponified cellulose acylate film was attached to one side of the produced polarizer using a polyvinyl alcohol-based adhesive. What is the side on which each cellulose acylate film prepared above is pasted using a polyvinyl alcohol adhesive by performing a similar saponification treatment on a commercially available cellulose triacetate film (Fujitac TD80UF, manufactured by Fuji Film Co., Ltd.)? Affixed to the opposite polarizer surface.
At this time, the transmission axis of the polarizer and the slow axis of the obtained cellulose acylate film were arranged in parallel. Further, the transmission axis of the polarizer and the slow axis of the commercially available cellulose triacetate film were arranged so as to be orthogonal to each other.
Thus, each polarizing plate was produced.

[Evaluation method]
<Evaluation of polarizing plate durability>
The polarizing plate durability test was performed as follows in a form in which the produced polarizing plate was attached to glass via an adhesive.
Two samples (about 5 cm × 5 cm) were prepared by attaching polarizing plates on glass so that the cellulose acylate films of Examples and Comparative Examples were on the air interface side. In the single plate orthogonal transmittance measurement, the sample was set with the glass side facing the light source. The measurement is performed in the range of 380 nm to 780 nm using an automatic polarizing film measuring device VAP-7070 manufactured by JASCO Corporation, and the orthogonal transmittance at 410 nm, which is a wavelength at which the influence of the deterioration in the performance of the polarizer is prominent. The measured value was adopted. Two samples were measured, and the average value was defined as the single plate orthogonal transmittance of the polarizing plate.
The parallel transmittance was measured by the same method as in the case of the above-mentioned single-plate orthogonal transmittance measurement except that the produced sample was rotated by 90 °. Two samples were measured, and the average value was taken as the parallel transmittance of the polarizing plate.
From the values of the single plate orthogonal transmittance and the parallel transmittance measured above, the degree of polarization (degree of polarization before aging) was determined by the following formula.
Polarization degree (%) = [(single plate orthogonal transmittance−parallel transmittance) / (single plate orthogonal transmittance + parallel transmittance)] 1/2 × 100

Thereafter, in the same manner as described above, a sample in which the produced polarizing plate was attached to glass via an adhesive was prepared, and after being stored for 500 hours in an environment with an atmospheric temperature of 85 ° C. and a relative humidity of 85%, the same as above. The degree of polarization (degree of polarization after time) was determined by the method. In addition, the relative humidity in the environment without humidity control was in the range of 0 to 20%.
From the degree of polarization before and after aging, the amount of change in the degree of polarization was calculated according to the following formula.
Change in polarization degree (%) = [degree of polarization after time (%) − degree of polarization before time (%)]

The polarizing plate durability was evaluated based on the following criteria from the calculated amount of change in polarization degree. It can be determined that the smaller the amount of change in the degree of polarization obtained by the above method, the better the polarizing plate durability. Storage for 500 hours in an environment with an ambient temperature of 85 ° C. and a relative humidity of 85% is a harsh storage condition. If the evaluation result is A or higher under this condition, it can be used as a polarizing plate even if it is used in various environments. It can be determined that the polarizing plate has extremely excellent polarizing plate durability that can continue to exhibit its role.
A +: Polarization degree change before and after aging is less than 0.05% A: Polarization degree change before and after aging is 0.05% or more and less than 2.0% B: Polarization degree change before and after aging is 2.0% or more Less than 3.0% C: The degree of polarization change before and after aging is 3.0% or more

<Measurement of moisture content>
The moisture content of the cellulose acylate films of Examples and Comparative Examples (equilibrium moisture content; temperature 25 ° C., relative humidity 80%) was measured using a film sample (size: 7 mm × 35 mm) cut from each film. The moisture content was measured by the Karl Fischer method using sample dryers “CA-03” and “VA-05” (both manufactured by Mitsubishi Chemical Co., Ltd.) The water content was obtained by dividing the water content (g) by the sample mass (g). Calculated.

<Moisture permeability>
The moisture permeability of the cellulose acylate films of Examples and Comparative Examples is the mass of water vapor passing through the sample in 24 hours in an atmosphere at a temperature of 40 ° C. and a relative humidity of 90% according to the moisture permeability test (cup method) of JIS Z0208. Was determined as a value converted to the mass of water vapor passing in 24 hours per 1 m ^{2 of} the sample area.

<Rth / d>
Rth at a wavelength of 590 nm was measured using AxoScan OPMF-1 (manufactured by Optoscience), and Rth (unit: nm) was divided by the film thickness (unit: μm) to obtain Rth / d.
The retardation increasing effect by the compound added to the cellulose acylate film was evaluated based on the following criteria.
A: 2.0 or more B: 1.5 or more and less than 2.0 C: 1.0 or more and less than 1.5 D: Less than 1.0

  The results are shown in Table 1.

From the result shown in Table 1, it can confirm that the polarizing plate of an Example is excellent in polarizing plate durability. In addition, the cellulose acylate films of the examples had lower water content and moisture permeability than the cellulose acylate films of the comparative examples. The inventor speculates that this contributes to the improvement of the durability of the polarizing plate.
Furthermore, it can also be confirmed from the results of Rth / d shown in Table 1 that the compound added to the cellulose acylate film in the example functions as a retardation increasing agent.

[Production of liquid crystal display devices]
Peel off the polarizing plate on the viewing side of a commercially available liquid crystal television (BRAVIA J5000 from Sony Corporation), and make each polarizing plate produced in the above examples so that the polarizing plate protective film in each of the above examples is on the outer side. A liquid crystal display device was obtained by pasting via an adhesive.

  The present invention is useful in the technical field of liquid crystal display devices.

70 Casting film 85 Casting band 89 Casting die 120 Core layer dope 121 Skin layer A dope 122 Skin layer B dope 120a Core layer 121a Skin layer A
122a Skin layer B
150 Skin layer B (support layer) die 151 Core layer (base layer) die 152 Skin layer A (air surface layer) die

Claims (15)

Cellulose acylate film containing a compound having two or more divalent linking groups represented by formula 1 in one molecule, represented by general formula (I-2), and having a molecular weight of 200 or more and 2000 or less ;
Formula 1:
^{-NR-C (= X 1)} -X 2 -
In Formula 1, R represents a hydrogen atom or a substituent, X ¹ and X ² each independently represent a sulfur atom or an oxygen atom, provided that at least one of X ¹ and X ² represents a sulfur atom;
Formula (I-2)
_{^{(Q 4 - (L 52 -L}} 51) n5 -A- (L 61 -L 62) n6) m1 -Z 2
In General Formula (I-2), L ⁵¹ and L ⁶¹ each independently represent an alkylene group, and the alkylene group may have a substituent; L ⁵² and L ⁶² are a single bond or —O—, -NR ¹ -, - S-, and -C (= O) - one or a group comprising a combination of these; ^{R 1} represents a hydrogen atom or a substituent; n5 and n6 are each 0 Represents an integer in the range of 20, but one of n5 and n6 is an integer of 1 or more, and when a plurality of L ⁵¹ , L ⁵² , L ⁶¹ and L ⁶² are present, they may be the same or different from each other ; Q ⁴ represents a substituted or unsubstituted phenyl group, a substituted or unsubstituted cyclohexyl group, a methyl group, an ethyl group, a propyl group, an isopropyl group, or a t- butyl group, Z ² represents a linear, branched or cyclic Of a group containing at least one of aliphatic and aromatic groups, the number of carbon atoms constituting the group represented by Z ² is in the range of 3 to 20, A is, * - X 2 ^-C (= X ¹ ) —NR— or * —NR—C (═X ¹ ) —X ² —, wherein R, X ¹ and X ² have the same meanings as those in Formula 1, and * represents the bonding position with L ^61. M1 represents an integer in the range of 2 to 6, and a plurality of Q ⁴ and A may be the same as or different from each other. The cellulose acylate film according to claim 1, wherein the compound contains 2 to 6 divalent linking groups represented by Formula 1 in one molecule. The cellulose acylate film according to claim 1, wherein the compound has a partial structure in which a divalent linking group represented by Formula 1 is directly linked to an aromatic ring. The cellulose acylate film according to any one of claims 1 to 3, wherein the compound has a partial structure in which a divalent linking group represented by Formula 1 is directly linked to an aromatic ring at at least one molecular terminal. 5. The cellulose acylate film according to claim 3, wherein in the partial structure, the divalent linking group represented by Formula 1 is directly connected to the aromatic ring via a nitrogen atom contained in Formula 1. 6. The cellulose acylate film according to claim 3, wherein the aromatic ring is a benzene ring. In the compound, as the divalent linking group represented by Formula 1, at least one divalent linking group in which X ¹ represents an oxygen atom and X ² represents a sulfur atom in one molecule is represented by Formula 1. The cellulose acylate film according to any one of claims 1 to 6. In the compound, all of the divalent linking groups represented by Formula 1 contained in the compound are divalent linking groups in which X ¹ represents an oxygen atom and X ² represents a sulfur atom in Formula 1. The cellulose acylate film according to claim 7. The compound is a divalent linking group represented by formula 1, wherein X ¹ represents an oxygen atom, X ² represents a sulfur atom, and R represents a hydrogen atom. The cellulose acylate film according to claim 1, comprising at least one in one molecule. In the compound, all the divalent linking groups represented by the formula 1 contained in the compound are all represented by the formula 1, wherein X ¹ represents an oxygen atom, X ² represents a sulfur atom, and R represents a hydrogen atom. The cellulose acylate film according to claim 9, which is a divalent linking group. The cellulose acylate film according to any one of claims 1 to 10, wherein the compound is contained in an amount of 0.1 to 50.0 parts by mass with respect to 100.0 parts by mass of the cellulose acylate. The polarizing plate containing the cellulose acylate film of any one of Claims 1-11, and a polarizer. The polarizing plate according to claim 12, wherein the polarizer is an iodine-stained polyvinyl alcohol film. A liquid crystal display device comprising the polarizing plate according to claim 13 and a liquid crystal cell. The liquid crystal display device according to claim 14, comprising the polarizing plate as at least a viewing-side polarizing plate.