JP2007009182A - Resin composition, formed body, film and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a formed body for optics excellent in appearance and optical characteristics, especially a film and a resin composition for producing the film, or a method for producing the film. <P>SOLUTION: The resin composition comprises an imide resin having a glutarimide unit, a (meth)acrylic acid ester unit and/or an aromatic vinyl unit and a specific lubricant. By using the composition, the formed body excellent in appearance and suitable for films and the like, especially the film, can be provided by improving processing stability without reducing optical characteristics caused by compounding. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a film having excellent optical properties such as transparency and few appearance defects, a resin composition therefor, and a method for producing the film.

  2. Description of the Related Art In recent years, electronic devices have become increasingly smaller, and liquid crystal display devices that take advantage of the features of light weight and compactness, such as notebook personal computers, mobile phones, and portable information terminals, have been increasingly used. These liquid crystal display devices start with a polarizing film, and various films are used to maintain the display quality. Also, a plastic liquid crystal display device using a resin film instead of a glass substrate has been put into practical use for the purpose of further reducing the weight of the liquid crystal display device for portable information terminals and mobile phones.

  In the case of handling polarized light as in a liquid crystal display device, the resin film used is optically transparent, optically homogeneous, less colored or discolored, and has a dotted or streaky appearance. It is required that there are few defects. Further, as in the case of a film substrate for a plastic liquid crystal display device in which the glass substrate is replaced with a resin film, it may be required that the phase difference represented by the product of birefringence and thickness is small. Furthermore, it may be required that the phase difference of the film hardly changes due to external stress or the like.

  Similarly to liquid crystal display devices, conventional glass used in various photographing devices such as cameras, film-integrated cameras, video cameras, optical pickup devices such as CDs and DVDs, OA equipment such as projectors, etc. has been used. Lenses are also being replaced with resin to reduce weight. Such plastic lenses are easily affected by phase difference due to focal length shift due to distortion due to temperature, humidity, and other usage environments, and stress during processing such as injection molding. It is demanded that it is difficult to change as well as film.

  Various forms of sheets, films, fibers, lenses, etc. (hereinafter also referred to as films) from thermoplastic resin molding, especially injection molding, melt extrusion film molding, inflation molding, blow molding, compression molding, spinning molding, etc. In some cases, the stability of operation in these molding machines (hereinafter referred to as processing stability) is important for the properties of the molded body. When used for the above-mentioned purposes, a particularly high level is often required. For example, in melt extrusion film forming, when the discharge amount during operation of a single-screw extruder generally equipped with a T-die is not stable, the supply of the molten resin to the T-die becomes unstable and is obtained as a result. A die line may be generated in the film, and the smoothness of the film may be unsatisfactory.

  The present invention has been made to solve the above-described problems, and is an optical molded article excellent in appearance and optical characteristics, in particular, a film and a resin composition for producing such a film, or the like. An object of the present invention is to provide a method for producing a transparent film.

  It is difficult to produce a film having the above various functions while avoiding the above problems.

  In particular, optical properties such as transparency of the film are greatly affected by the blending of additives in the film material. The uniformity of the material is generally highly influenced by the optical properties of the film. For this reason, when a small amount of impurities are mixed, the optical characteristics are often impaired. When various additives generally used for films other than normal optical applications are used in the film as they are, the optical properties are usually deteriorated, making it difficult to use as a film. When the amount of the additive is reduced to such an extent that the optical characteristics are not deteriorated, it is difficult to obtain the additive effect of the additive.

  As a result of intensive studies in view of the above problems, the present inventors have been able to improve processing stability without causing deterioration of optical properties due to the blending, and to obtain molded articles and the like. The present inventors have found that a molded article excellent in a suitable appearance, particularly a film, can be provided, and have reached the present invention.

(1) That is, the resin composition formed containing the following (A) and (B) was provided.
(A) Imido resin (B) fatty acid having a unit represented by the following general formula (1), a unit represented by the following general formula (2) and / or a unit represented by the following general formula (3) One type selected from the group consisting of amide (amide) lubricants, fatty acid ester lubricants, metal soap lubricants, polymer lubricants, aliphatic hydrocarbon lubricants, aliphatic alcohol lubricants, and aliphatic acid lubricants More lubricant

(Wherein, R ¹ and R ² each independently represents a hydrogen or an alkyl group having 1 to 8 carbon atoms, R ³ is an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, Or a substituent containing an aromatic ring having 5 to 15 carbon atoms.)

(However, R ⁴ and R ⁵ each independently represent hydrogen or an alkyl group having 1 to 8 carbon atoms, and R ⁶ represents an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, Or a substituent containing an aromatic ring having 5 to 15 carbon atoms.)

(However, R ⁷ represents hydrogen or an alkyl group having 1 to 8 carbon atoms, and R ⁸ represents an aryl group having 6 to 10 carbon atoms.)

  (2) The resin composition as described in (1), wherein the content of the lubricant (B) in the resin composition is 0.01 to 1% by weight.

  (3) The resin composition according to any one of (1) and (2), wherein the haze is 1% or less and the total light transmittance is 85% or more.

  (4) A molded article comprising the resin composition according to any one of (1) to (3) is provided.

  (5) A film comprising the resin composition according to any one of (1) to (3) is provided.

(6) A molded article and film made of the resin composition according to any one of (1) to (5), wherein the orientation birefringence is 0 or more and 0.1 × 10 ⁻³ or less. Provided.

  (7) The film according to any one of (1) to (6), wherein the in-plane retardation is 10 nm or less and the thickness direction retardation is 20 nm or less.

  (8) The film according to any one of (5) to (7), which is obtained by a melt extrusion method.

  (9) The film according to any one of (5) to (8), wherein the film is stretched.

  (10) The method for producing a film according to any one of (5) to (9), wherein the film is formed by a melt extrusion method.

  (11) The method for producing a film according to (10), further comprising a step of stretching.

  INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide an optical molded body excellent in appearance and optical characteristics, particularly a film, which is useful.

The present invention relates to a resin composition formed by containing the following (A) and (B). (A) Imide resin (B) having a unit represented by the following general formula (1), a unit represented by the following general formula (2) and / or a unit represented by the following general formula (3) 1 selected from the group consisting of fatty acid amide (amide) lubricants, fatty acid ester lubricants, metal soap lubricants, polymer lubricants, aliphatic hydrocarbon lubricants, aliphatic alcohol lubricants, and aliphatic acid lubricants More than one type of lubricant

(However, R ¹ and R ² each independently represent hydrogen or an alkyl group having 1 to 8 carbon atoms, and R ³ represents an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, Or a substituent containing an aromatic ring having 5 to 15 carbon atoms.)

(However, R ⁴ and R ⁵ each independently represent hydrogen or an alkyl group having 1 to 8 carbon atoms, and R ⁶ represents an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, Or a substituent containing an aromatic ring having 5 to 15 carbon atoms.)

(However, R ⁷ represents hydrogen or an alkyl group having 1 to 8 carbon atoms, and R ⁸ represents an aryl group having 6 to 10 carbon atoms.)

  The first structural unit constituting the imide resin of the present invention is represented by the following general formula (1), and is generally called a glutarimide unit (hereinafter referred to as general formula (1)). (It may be abbreviated as glutarimide unit.)

(However, R ¹ and R ² each independently represent hydrogen or an alkyl group having 1 to 8 carbon atoms, and R ³ represents an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, Or a substituent containing an aromatic ring having 5 to 15 carbon atoms.)

As a preferable glutarimide unit, R ¹ and R ² are hydrogen or a methyl group, and R ³ is hydrogen, a methyl group, a butyl group, or a cyclohexyl group. The case where R ¹ is a methyl group, R ² is hydrogen, and R ³ is a methyl group is particularly preferred.

The glutarimide unit may be a single type or may include a plurality of types in which R ¹ , R ² , and R ³ are different.

  The glutarimide unit can be formed by imidizing the second structural unit described below. In addition, acid anhydrides such as maleic anhydride or half esters of these and linear or branched alcohols having 1 to 20 carbon atoms; acrylic acid, methacrylic acid, maleic acid, maleic anhydride, itaconic acid, itaconic anhydride, Α, β-ethylenically unsaturated carboxylic acids such as crotonic acid, fumaric acid, and citraconic acid can also be imidized and can be used to form glutarimide units.

  The second structural unit constituting the imide resin of the present invention is represented by the following general formula (2), and is generally called a (meth) acrylic acid ester unit (hereinafter referred to as general). (Formula (2) may be abbreviated as (meth) acrylic acid ester unit.)

(However, R ⁴ and R ⁵ each independently represent hydrogen or an alkyl group having 1 to 8 carbon atoms, and R ⁶ represents an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, Or an aryl group having 6 to 10 carbon atoms.)

  When the imide resin of the present invention is produced, first, a (meth) acrylic acid ester-aromatic vinyl copolymer or a (meth) acrylic acid ester polymer is polymerized and formed by post-imidization, In particular, the raw material for giving a (meth) acrylic acid ester unit as a residue is not particularly limited. For example, methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) Examples include acrylate, t-butyl (meth) acrylate, benzyl (meth) acrylate, and cyclohexyl (meth) acrylate. Of these, methyl methacrylate is particularly preferred.

These second structural units may be of a single type, or may include a plurality of types in which R ⁴ , R ⁵ and R ⁶ are different. Similarly, a plurality of types of raw materials that give the (meth) acrylic acid ester unit as a residue may be used.

  The third structural unit contained in the imide resin of the present invention as needed is represented by the following general formula (3), and is generally called an aromatic vinyl unit (hereinafter, generally referred to as general vinyl). (Formula (3) may be abbreviated as an aromatic vinyl unit.)

(However, R ⁷ represents hydrogen or an alkyl group having 1 to 8 carbon atoms, and R ⁸ represents an aryl group having 6 to 10 carbon atoms.)

  Preferred aromatic vinyl structural units include styrene, α-methylstyrene, and the like. Of these, styrene is particularly preferred.

These third structural units may be of a single type, or may include a plurality of types in which R ⁷ and R ⁸ are different.

  The content of the glutarimide unit represented by the general formula (1) in the imide resin of the present invention depends on, for example, the structure of R3, but is preferably 20% by weight or more of the imide resin. The preferable content of the glutarimide unit is 20% to 95% by weight, more preferably 40 to 90% by weight, and still more preferably 50 to 80% by weight. When the ratio of the glutarimide unit is smaller than this range, the resulting imide resin may have insufficient heat resistance or the transparency may be impaired. On the other hand, if it exceeds this range, the heat resistance and melt viscosity are unnecessarily increased, the moldability becomes worse, the mechanical strength of the resulting film becomes extremely brittle, and the transparency may be impaired.

  The content of the aromatic vinyl unit represented by the general formula (3) in the imide resin of the present invention is preferably 10% by weight or more based on the total repeating unit of the imide resin. The preferred content of the aromatic vinyl unit is 10 to 40% by weight, more preferably 15 to 30% by weight, and still more preferably 15 to 25% by weight. When the aromatic vinyl unit is larger than this range, the resulting imide resin has insufficient heat resistance. If it is smaller than this range, the mechanical strength of the resulting film may be lowered.

  By adjusting the ratios of the general formulas (1), (2), and (3), it is possible to adjust various required physical properties. For example, when the imide resin of the present invention is formed by first polymerizing a (meth) acrylic ester-aromatic vinyl copolymer such as methyl methacrylate-styrene copolymer and then imidizing, for example, (meth) acrylic acid The ratio of the general formula (3) is determined by adjusting the polymerization ratio of the ester and the aromatic vinyl (the ratio of the general formula (3) can be set to 0), and the addition ratio of the primary amine at the time of post-imidation By adjusting the ratio, the ratios of the general formulas (1) and (2) can be further adjusted.

  If necessary, the imide resin of the present invention may further be copolymerized with a fourth structural unit. A constitution obtained by copolymerizing nitrile monomers such as acrylonitrile and methacrylonitrile, and maleimide monomers such as maleimide, N-methylmaleimide, N-phenylmaleimide, N-cyclohexylmaleimide as the fourth structural unit Units can be used. These may be directly copolymerized in a thermoplastic resin or may be graft copolymerized.

  When producing the imide resin of the present invention, first, a (meth) acrylic acid ester-aromatic vinyl copolymer such as methyl methacrylate-styrene copolymer or a (meth) acrylic acid ester weight such as methyl methacrylate polymer is used. When a polymer is polymerized and converted into an imide resin, the (meth) acrylate-aromatic vinyl copolymer and (meth) acrylate polymer that can be used in the present invention can undergo an imidization reaction. As long as it is a linear polymer, it may be a block polymer, a core-shell polymer, a branched polymer, a ladder polymer, or a crosslinked polymer. The block polymer may be an A-B type, an A-B-C type, an A-B-A type, or any other type of block polymer. The core-shell polymer may be composed of only one core and only one shell, or each may be a multilayer.

The imide resin of the present invention preferably has a weight average molecular weight of 1 × 10 ⁴ to 5 × 10 ⁵ . When the weight average molecular weight is less than 1 × 10 ⁴ , the mechanical strength in the case of a film is insufficient, and when it exceeds 5 × 10 ⁵ , the viscosity at the time of melt extrusion is high and the molding processability is lowered. , Productivity of molded products may decrease.

  The glass transition temperature of the imide resin of the present invention is preferably 110 ° C. or higher, and more preferably 120 ° C. or higher. When the glass transition temperature is lower than the above value, the application range is limited in applications where heat resistance is required.

  In the imide resin of the present invention, the type containing the general formula (3) is optical by adjusting the content of each constituent unit and glutarimide unit in the methyl (meth) acrylate-styrene copolymer. It is also possible to reduce the anisotropy. The small optical anisotropy referred to here requires not only the optical anisotropy in the in-plane direction (length direction and width direction) of the film but also the optical anisotropy in the thickness direction. There is. That is, the direction in which the in-plane refractive index is maximum is the X-axis, the direction perpendicular to the X-axis is the Y-axis, the thickness direction of the film is the Z-axis, and the refractive index in each axial direction is nx, ny, nz, film In-plane retardation Re = (nx−ny) × d and thickness direction retardation Rth = | (nx + ny) / 2−nz | × d (where || represents an absolute value). (In an ideal film, which is completely optically isotropic in the three-dimensional direction, both the in-plane retardation Re and the thickness direction retardation Rth are zero).

  The film of the present invention preferably has an in-plane retardation of the film of 10 nm or less and a thickness direction retardation of 20 nm or less. The in-plane retardation of the film is more preferably 5 nm or less. The thickness direction retardation is more preferably 10 nm or less. When a polarizer protective film having an in-plane retardation of the film exceeding 10 nm or a retardation in the thickness direction exceeding 20 nm is used as a polarizing plate, a problem such as a decrease in contrast may occur in a liquid crystal display device. .

  In the imide resin of the present invention, the type containing the general formula (3) is substantially oriented birefringence by adjusting the content of each constituent unit and glutarimide unit in the methyl methacrylate-styrene copolymer. It is also possible to add features that do not have Oriented birefringence refers to birefringence that develops when stretched at a predetermined temperature and a predetermined draw ratio. In this specification, unless otherwise specified, it means birefringence that develops when stretched 100% at a temperature 5 ° C. higher than the glass transition temperature of the imide resin. Here, the orientation birefringence (Δn) is defined by Δn = nx−ny = Re / d using the above-described nx and ny, and is measured by a phase difference meter.

The orientation birefringence value is preferably 0 or more and 0.1 × 10 ⁻³ or less, and more preferably 0 or more and 0.01 × 10 ⁻³ or less. When the orientation birefringence is out of the above range, the birefringence is likely to occur during the molding process with respect to environmental changes, and it becomes difficult to obtain stable optical characteristics.

  In order to obtain an imide resin having substantially no optical isotropy and orientation birefringence, each of the (meth) acrylate ester-aromatic vinyl copolymers such as methyl methacrylate-styrene copolymer is used. It is necessary to adjust the structural unit amount and further adjust the degree of imidization. The repeating unit represented by the general formula (1) and the repeating unit represented by the general formula (3) have a weight ratio of 2.0: 1. It is preferably in the range of 0.0 to 4.0: 1.0, more preferably in the range of 2.5: 1.0 to 4.0: 1.0, and 3.0: 1.0 to 3.5. : The range of 1.0 is still more preferable.

  The imide resin of the present invention is imidized into a (meth) acrylic acid ester-aromatic vinyl copolymer such as methyl methacrylate-styrene copolymer or a (meth) acrylic acid ester polymer such as methyl methacrylate polymer. If it is a method of processing an agent, it can manufacture by various methods, an extruder etc. may be used and a batch type reaction tank (pressure vessel) etc. may be used.

  When performing the manufacturing method of the imide resin of this invention with an extruder, various extruders can be used, For example, a single screw extruder, a twin screw extruder, a multi screw extruder etc. can be used. In particular, a twin screw extruder is preferable as an extruder that can promote mixing of an imidizing agent with a raw material polymer. There are non-mesh type co-rotating type, meshing type co-rotating type, non-meshing type bi-directional rotating type, meshing type bi-directional rotating type, etc. The meshing-type co-rotating type is preferable because it can rotate at a high speed and can promote mixing of the imidizing agent with the raw material polymer. These extruders may be used alone or connected in series.

  The extruder is preferably equipped with a vent port that can be depressurized below atmospheric pressure in order to remove unreacted imidizing agent or by-products such as methanol and monomers.

  For example, instead of an extruder, imide resin can be produced by using a high-viscosity reactor such as a horizontal biaxial reactor such as Violac manufactured by Sumitomo Heavy Industries, Ltd. or a vertical biaxial agitation tank such as Super Blend. It can be suitably used.

  When the production method of the imide resin of the present invention is carried out in a batch type reaction vessel (pressure vessel), it is particularly limited as long as the raw material polymer can be melted by heating and stirred and an imidizing agent or a ring closure accelerator can be added However, the viscosity of the polymer may increase with the progress of the reaction, and those with good stirring efficiency are preferred. For example, Sumitomo Heavy Industries, Ltd. agitation tank Max blend etc. can be illustrated.

  The imide resin of the present invention can be modified with an esterifying agent for the purpose of reducing carboxyl groups and acid anhydride groups by-produced during production.

  Examples of esterifying agents include dimethyl carbonate, 2,2-dimethoxypropane, dimethyl sulfoxide, triethyl orthoformate, trimethyl orthoacetate, trimethyl orthoformate, diphenyl carbonate, dimethyl sulfate, methyl toluene sulfonate, methyl trifluoromethyl sulfonate. , Methyl acetate, methanol, ethanol, methyl isocyanate, p-chlorophenyl isocyanate, dimethylcarbodiimide, dimethyl-t-butylsilyl chloride, isopropenyl acetate, dimethylurea, tetramethylammonium hydroxide, dimethyldiethoxysilane, tetra-N-butoxy Silane, dimethyl (trimethylsilane) phosphite, trimethyl phosphite Trimethyl phosphate, tricresyl phosphate, diazomethane, ethylene oxide, propylene oxide, cyclohexene oxide, 2-ethylhexyl glycidyl ether, phenyl glycidyl ether, and benzyl glycidyl ether.

  In addition to the above-mentioned (A) imide resin, the composition of the present invention comprises (B) a fatty acid amide (amide) lubricant, a fatty acid ester lubricant, a metal soap lubricant, a polymer lubricant, and an aliphatic hydrocarbon It further includes one or more lubricants selected from the group consisting of a lubricant, an aliphatic alcohol lubricant, and an aliphatic acid lubricant. As a result, it is possible to improve the processing heat stability without causing deterioration of the optical characteristics due to the blending, and it is possible to provide a film excellent in appearance suitable for a film or the like. In particular, it is possible to suitably form a film having an excellent appearance with a haze of 1% or less and a total light transmittance of 85% or more.

  The in-plane retardation of the film does not deteriorate even when the lubricant is added. For example, in a preferred embodiment, the in-plane retardation of the film can be controlled to 10 nm or less, and in a more preferred embodiment, it can be controlled to 6 nm or less. Further, for example, the retardation in the film thickness direction can be controlled to 20 nm or less, and in a more preferred embodiment, it can be controlled to 10 nm or less.

  On the other hand, when the haze is larger than 1%, the transparency is likely to deteriorate in an optical material application requiring transparency. Furthermore, when the total light transmittance is 85% or less, light in the visible light region is easily absorbed.

  As the fatty acid amide (amide) lubricant, any known fatty acid amide (amide) lubricant can be used. Fatty acid amide (amide) lubricants are amides (amides) consisting of fatty acids and amines, and have long-chain aliphatic groups and amide groups in the molecule. Saturated / unsaturated monoamides (amides), substituted amides (Amide), saturated / unsaturated bisamide (amide), methylolamide (amide), ethanolamide (amide), ester amide (amide), aromatic bisamide (amide), substituted urea and the like. Examples of preferred fatty acid amide (amide) lubricants include, for example, stearic acid amide (amide), oleic acid amide (amide), erucic acid amide (amide), behenic acid amide (amide), stearyl erucic acid amide (amide) , Ethylene bis erucamide (amide), ethylene bis stearamide (amide), ethylene bis oleamide (amide), N-oleyl palmitoamide (amide), N-stearyl erucamide (amide), ethylenediamine stearin Examples include acid and sebacic acid polycondensates.

  Any known fatty acid ester lubricant may be used as the fatty acid ester lubricant. The fatty acid ester lubricant is an ester made from fatty acids and various alcohols, and has a long-chain fatty group and an ester group in the molecule. Preferred examples of fatty acid ester lubricants include higher fatty acid esters of monohydric alcohols, higher fatty acid (partial) esters of polyhydric alcohols, montanic acid esters, montanic acid partially saponified esters, and montanic acid complex esters. . More specifically, methyl laurate, methyl myristate, methyl palmitate, methyl stearate, methyl oleate, methyl erucate, methyl behenate, butyl laurate, butyl stearate, isopropyl myristate, isopropyl palmitate, Octyl palmitate, octyl palmitate, octyl stearate, octyl beef fatty acid, lauryl laurate, stearyl stearate, behenyl behenate, cetyl myristate, neopentyl polyol long chain fatty acid ester, pentaerythritol fatty acid condensation ester, trimethylol Propane fatty acid ester, trimethylolpropane triolate, trimethylolpropane trifatty acid ester, pentaerythritol fatty acid ester, neopentyl Recalldiolate, pentaerythritol tetraoleate, pentaerythritol tetraoleate, dipentaerythritol fatty acid ester, neopentyl glycol dicaprate, trimethylolpropane dicaprate, dipentaerythritol hexaisononanoate, trimethylolpropane fatty acid Examples include condensed esters.

  Any known metal soap lubricant can be used as the metal soap lubricant. The metal soap lubricant is a salt of a fatty acid (for example, stearic acid, lauric acid, myristic acid, castor oil fatty acid, etc.) and a metal such as aluminum, calcium, zinc, magnesium and barium. Preferable examples of the metal soap lubricant include calcium stearate, zinc stearate, magnesium stearate and the like. More preferably, it is zinc stearate.

  Any known polymer lubricant can be used as the polymer lubricant. Preferable examples of the polymeric lubricant include, for example, alkyl acrylate / alkyl methacrylate / styrene copolymers.

  As the aliphatic hydrocarbon lubricant, any known aliphatic hydrocarbon lubricant can be used. Preferable examples of the aliphatic hydrocarbon-based lubricant include, for example, C16 or higher liquid paraffin, microcrystalline wax, natural paraffin, synthetic paraffin, polyolefin wax such as polyethylene wax, and partial oxides thereof, or fluorides and chlorides. Etc.

  Any known aliphatic alcohol lubricant can be used as the aliphatic alcohol lubricant. Preferred examples of the aliphatic alcohol lubricant include hexanol (caproyl alcohol), octanol (caprylyl alcohol), decyl alcohol decanol (capryl alcohol), dodecanol (lauryl alcohol), tetradecanol (myristyl alcohol), Examples include hexadecanol (cetyl alcohol), octadecinol (stearyl alcohol), eicosanol (arachidyl alcohol), docosanol, and behenyl alcohol). More preferred is octadecinol (stearyl alcohol).

  As the fatty acid lubricant, a known fatty acid lubricant can be used. Preferred examples of the fatty acid-based lubricant include saturated fatty acids such as caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, and behenic acid, and unsaturated fatty acids such as oleic acid and erucic acid. It is done.

  The lubricant used in the present invention includes (B) fatty acid amide (amide) lubricant, fatty acid ester lubricant, metal soap lubricant, polymer lubricant, aliphatic hydrocarbon lubricant, aliphatic alcohol lubricant, and It may be a composite lubricant in which an aliphatic acid lubricant is combined. It is often difficult to satisfy all the characteristics with only one kind of lubricant, and it is preferable to appropriately combine these various lubricants according to the application.

  The lubricant used in the present invention is particularly preferably a combination of a fatty acid amide lubricant and a metal soap lubricant. More preferably, it is a combination of ethylenediamine / stearic acid / sebacic acid polycondensate and zinc stearate. An aliphatic alcohol lubricant is also suitable, and octadecinol (stearyl alcohol) is particularly preferred.

  The amount of (B) lubricant added to the composition of the present invention is preferably 0.01 to 1% by weight based on the imide resin. More preferably, it is 0.03 to 0.5% by weight. More preferably, it is 0.05 to 0.3% by weight. When the addition amount of the lubricant is too small, the effect of the lubricant is difficult to obtain, the processing stability is lacking, and the surface smoothness of the molded product, particularly the film, tends to be impaired. Moreover, when there is too much addition amount of a lubricant, the haze of a molded article becomes high and there exists a subject that transparency deteriorates.

  By appropriately selecting the preferred composition, for example, the above-described in-plane retardation, thickness direction retardation, and birefringence performance, as well as unstretched film and stretched film having low haze and high total light transmittance. Can be suitably obtained. Specifically, for example, in a preferred embodiment, a film having a haze of 1% or less is easily obtained, and in a more preferred embodiment, a film having a haze of 0.5% or less is obtained. Furthermore, a film having a total light transmittance of 85% or more can be easily obtained, and in a more preferred embodiment, a film having 88% or more can be obtained. Any film having a haze of 1% or less and a total light transmittance of 85% or more can be used as a high-performance film for various optical applications.

  As a method for obtaining the resin composition used in the present invention, any known method can be adopted as long as the imide resin (A) and the lubricant (B) can be mixed and put into a film forming machine. obtain. For example, a method of obtaining a resin composition by simply mixing an imide resin (A) and a lubricant (B), and a method of obtaining a resin composition by hot-melt kneading an imide resin (A) and a lubricant (B) are mentioned. It is done. In addition, an imidizing agent is added to a (meth) acrylic acid ester-aromatic vinyl copolymer such as a (meth) acrylic acid methyl styrene copolymer or a (meth) acrylic acid ester polymer such as a methyl methacrylate polymer. It is also possible to add in the process of manufacturing the imide resin to process.

  The resin composition of this invention may contain well-known additives, such as a stabilizer, a plasticizer, a ultraviolet absorber, a filler, and other resin as needed. In the present specification, such components other than the imide resin (A) and the lubricant (B) are also referred to as “third component”.

  In order to improve the mechanical properties of the molded product, particularly the film, a plasticizer or a flexible polymer may be added to the resin composition. However, when these materials are used, the glass transition temperature may be lowered and heat resistance may be impaired, or transparency may be impaired. For this reason, when these plasticizers or flexible polymers are used, the amount added should not interfere with the performance of the film. Preferably, it is 20% by weight or less in the resin composition. More preferably, it is 10 weight% or less, More preferably, it is 5 weight% or less. When the imide content of the imide resin (A) is high, the resulting film tends to be hard and brittle, so adding a small amount of plasticizer is effective because it can prevent stress whitening and tearing of the film. As such a plasticizer, conventionally known plasticizers can be used. For example, aliphatic dibasic acid plasticizers such as di-n-decyl adipate and phosphate ester plasticizers such as tributyl phosphate can be exemplified.

  When a resin is used as the third component, it may be a thermoplastic resin or a thermosetting resin. A thermoplastic resin is preferable. In this case, the third component may be a single resin or a blend of a plurality of types of resins. When the resin is used as the third component, the amount used is preferably 30% by weight or less in the resin composition, more preferably 20% by weight or less, and still more preferably 10% by weight or less. Moreover, it is preferable that it is 1 weight% or more of a resin composition, More preferably, it is 2 weight% or more, More preferably, it is 3 weight% or more. When there are too many 3rd components, the performance of an imide resin (A) and a lubricant (B) is not fully exhibited. Moreover, when the 3rd component with low compatibility with imide resin (A) and a lubricant (B) is used, the optical performance of the film obtained will fall easily. When the third component is too small, it is difficult to obtain the effect of adding the third resin.

  If necessary, the film of the present invention may contain a filler for the purpose of improving the slipperiness of the film or for other purposes. As the filler, any conventionally known filler used for a film can be used. The filler may be inorganic fine particles or organic fine particles. Examples of inorganic fine particles include metal oxide fine particles such as silicon dioxide, titanium dioxide, aluminum oxide and zirconium oxide, silicate fine particles such as calcined calcium silicate, hydrated calcium silicate, aluminum silicate and magnesium silicate, And calcium carbonate, talc, clay, calcined kaolin and calcium phosphate. Examples of the organic fine particles include resin fine particles such as silicon resin, fluorine resin, acrylic resin, and cross-linked styrene resin.

  The filler can be added within a range that does not significantly impair the optical properties of the film. Preferably, it is 10 weight% or less in a resin composition.

  Even when the third component is used, the mixing ratio of the imide resin (A) and the lubricant (B) is preferably the above-described ratio, as in the case where the third component is not used.

  As a method for molding the molded article of the present invention, any conventionally known method can be used. Examples thereof include injection molding, melt extrusion film molding, inflation molding, blow molding, compression molding, and spinning molding. Further, a solution casting method or a spin coating method in which the resin composition of the present invention is dissolved in a soluble solvent and then molded is also possible. Any of them can be adopted, but the melt extrusion method without using a solvent is preferable from the viewpoints of the global environment and working environment, the manufacturing cost, the influence of the solvent on the global environment and working environment, and the like.

  Hereinafter, in order to distinguish a film formed by the melt extrusion method from a film formed by another method such as a solution casting method, it is expressed as a melt-extruded film.

  In a preferred embodiment, the thermoplastic resin to be used is pre-dried before film formation. The preliminary drying is performed by, for example, a hot air dryer or the like in the form of pellets or the like. Pre-drying is very useful because it can prevent the extruded resin from firing. Next, the thermoplastic resin is supplied to an extruder. The thermoplastic resin heated and melted in the extruder is supplied to the T die through a gear pump and a filter. The use of the gear pump is very useful because it has a high effect of improving the uniformity of the extrusion amount of the resin and reducing thickness unevenness. The use of the filter is useful for removing a foreign substance in the resin and obtaining a film having an excellent appearance without defects. In a more preferred embodiment, a sheet-like molten resin extruded from a T die is sandwiched between two cooling drums and cooled to form a film. It is particularly preferable that one of the two cooling drums is a rigid metal drum having a smooth surface, and the other is a flexible drum having an elastically deformable metal elastic outer cylinder having a smooth surface. . With a rigid drum and a flexible drum, the sheet-like molten resin extruded from the T-die is sandwiched and cooled to form a film, thereby correcting fine irregularities on the surface and die lines, etc., and smoothing the surface. It is effective because a film having a thickness unevenness of 5 μm or less can be obtained.

  The cooling roll is sometimes called a “touch roll” or a “cooling roll”, but the term “cooling roll” in this specification includes these rolls. When the sheet-like molten resin extruded from the T die is cooled while being sandwiched between a rigid roll and a flexible roll to form a film, even if one roll can be elastically deformed, any roll surface Since it is a metal, when forming a thin film, the roll surfaces come into contact with each other and the roll outer surface is easily damaged, or the roll itself is easily damaged. Therefore, the thickness of the film to be molded is preferably 10 μm or more, more preferably 50 μm or more, still more preferably 80 μm or more, and particularly preferably 100 μm or more. In addition, when a film is formed by cooling a sheet-like molten resin extruded from a T-die while being sandwiched between a rigid roll and a flexible roll, if the film is thick, the cooling of the film tends to be uneven, and optical Characteristic tends to be non-uniform. Accordingly, the thickness of the film is preferably 200 μm or less, and more preferably 170 μm or less. In addition, as an embodiment in the case of producing a thinner film, after obtaining a relatively thick raw material film by such sandwich molding, a film having a predetermined thickness is produced by uniaxial stretching or biaxial stretching. Things are preferable. If an example of an embodiment is given, after manufacturing a raw material film with a thickness of 150 μm by such sandwich molding, a film with a thickness of 40 μm can be manufactured by vertical and horizontal biaxial stretching.

  The stretched film according to the present invention can be suitably obtained by forming the above-described resin composition of the present invention into an unstretched raw material film and further performing uniaxial stretching or biaxial stretching.

  In the present specification, for convenience of explanation, a film after the resin composition is formed into a film and before being stretched is referred to as “raw film” or “unstretched film”.

  The film of the present invention can be made into a final product in the state of a raw material film, that is, in the state of an unstretched film. Moreover, it can be set as a final product in the state of a uniaxially stretched film. Furthermore, it is good also as a biaxially stretched film by carrying out combining a extending process.

  By performing the stretching, the mechanical properties are improved. In conventional films, it has been difficult to avoid the occurrence of retardation when a stretching process is performed. However, a film formed using the particularly preferable resin composition of the present invention has an advantage that a phase difference does not substantially occur even when subjected to a stretching treatment. The film may be stretched continuously immediately after forming the raw material film.

  Here, the state of the “raw material film” may exist only momentarily. In the case where it exists only momentarily, that momentary state after the film is formed and then stretched is referred to as a raw material film. In addition, the raw material film only needs to be in a film shape sufficient to be stretched thereafter, and does not have to be in a complete film state. Of course, it does not have performance as a completed film. Also good. If necessary, after forming the raw material film, the film may be temporarily stored or moved, and then the film may be stretched.

  As a method of stretching the raw material film, any conventionally known stretching method can be adopted. Specifically, for example, there are transverse stretching using a tenter, longitudinal stretching using a roll, and sequential biaxial stretching in which these are sequentially combined. A simultaneous biaxial stretching method in which the longitudinal and lateral directions are simultaneously stretched can also be employed. You may employ | adopt the method of performing horizontal extending | stretching by a tenter after performing roll longitudinal stretching.

  In the present invention, when the film is stretched, the film is preferably preheated to a temperature 0.5 to 5 ° C. higher than the stretching temperature, and then cooled to the stretching temperature and stretched. More preferably, it is preferably preheated to a temperature 1 to 3 ° C. higher than the stretching temperature, and then cooled to the stretching temperature and stretched. If the preheating temperature is too high, such a problem that the film sticks to the roll or loosens by its own weight is not preferable. Further, if the preheating temperature is not much different from the stretching temperature, it is difficult to maintain the thickness accuracy of the film before stretching, or the thickness unevenness tends to increase, and the thickness accuracy tends to decrease. In the case of a crystalline thermoplastic resin, a necking phenomenon can be used in stretching, and in this case, the thickness accuracy is improved by stretching. On the other hand, in the case of the resin composition of the present invention, it is difficult to use the necking phenomenon at the time of stretching. Therefore, such temperature control is particularly important in order to maintain or improve the thickness accuracy.

  The stretching temperature and stretching ratio of the film can be appropriately adjusted using the mechanical strength, surface properties, and thickness accuracy of the obtained film as indices. The range of the stretching temperature is preferably in the range of (Tg-30 ° C) to (Tg + 30 ° C), where Tg is the glass transition temperature of the film obtained by the DSC method. More preferably, it is in the range of (Tg−20 ° C.) to (Tg + 20 ° C.). More preferably, it is in the range of (Tg ° C.) to (Tg + 20 ° C.). When the stretching temperature is too high, the thickness unevenness of the obtained film tends to be large, and improvement in mechanical properties such as elongation, tear propagation strength, and fatigue resistance tends to be insufficient. Moreover, the trouble that the film adheres to the roll is likely to occur. On the other hand, when the stretching temperature is too low, the haze of the stretched film tends to increase, and in the extreme case, problems such as tearing and cracking of the film tend to occur. The preferred draw ratio depends on the drawing temperature, but is selected in the range of 1.1 to 3 times. More preferably, it is 1.3 times to 2.5 times. More preferably, it is 1.5 times to 2.3 times. By adjusting the imide resin (A) and the lubricant (B) to the above-mentioned preferable mixing range and selecting an appropriate stretching condition, it is possible to substantially increase the haze without causing birefringence substantially. Therefore, it is possible to easily obtain a film with small thickness unevenness. Preferably, by stretching 1.3 times or more, more preferably 1.5 times or more, mechanical properties such as film elongation, tear propagation strength, and fatigue resistance are greatly improved. A film having a thickness of 5 μm or less, a birefringence of substantially zero, and a haze of 2% or less can be obtained.

  The stretched film thickness of the present invention is preferably 10 μm to 200 μm, more preferably 20 μm to 150 μm, and still more preferably 30 μm to 100 μm. When forming a film that is too thick, for example, when forming a film exceeding 200 μm as an unstretched film, the cooling of the film is likely to be non-uniform, and the optical homogeneity and the like are likely to decrease. In the case of forming a film that is too thin, the draw ratio becomes excessive and haze is likely to deteriorate.

  The optical molded body of the present invention, particularly the film, can be subjected to surface treatment if necessary. Examples of the surface treatment method include corona treatment, plasma treatment, ultraviolet irradiation, and alkali treatment. In particular, when surface treatment such as coating is applied to the film surface, or when another film is laminated with an adhesive, surface treatment of the film should be performed as a means for improving mutual adhesion. Is preferred. Corona treatment is a particularly preferred method. A preferable degree of surface treatment is 50 dyn / cm or more. Although the upper limit is not particularly defined, it is more preferably 80 dyn / cm or less from the viewpoint of equipment for surface treatment.

  In addition, a coating layer such as a hard coat layer can be formed on the optical molded body of the present invention, particularly on the surface of the film, if necessary. The film of the present invention can form an indium tin oxide-based transparent conductive layer by sputtering or the like, with or without a coating layer, and can be used for electrode substrates and touch panels of plastic liquid crystal display devices. It can also be used as an electrode substrate.

  The optical molded body of the present invention, particularly the film, can be used as it is for various applications as a final product. Alternatively, it can be used for various purposes by performing various processes. For example, imaging fields such as cameras, VTRs, projector lenses, viewfinders, filters, prisms, and Fresnel lenses, lens fields such as optical pickup lenses for CD players, DVD players, MD players, CD players, DVD players, Optical recording fields for optical discs such as MD players, liquid crystal light guide plates, liquid crystal display films such as polarizer protective films and retardation films, information equipment fields such as surface protective films, optical fibers, optical switches, optical connectors, etc. Optical communication field, automotive headlights, tail lamp lenses, inner lenses, instrument covers, sunroofs and other vehicle fields, eyeglasses, contact lenses, internal vision lenses, medical equipment fields such as medical supplies that require sterilization, road light transmission Board Glass lens, lighting windows and car port, illumination lens and lighting cover, construction and building materials sectors such as building materials for sizing, and a microwave cooking container (tableware), and the like. In particular, the molded body and film of the present invention use the optical homogeneity, transparency, low birefringence, etc. of the optical isotropic film, polarizer protective film, transparent conductive film and the like around the liquid crystal display device. It can use suitably for well-known optical uses, such as. In particular, it is suitable for known optical applications such as optical isotropic films, polarizer protective films, transparent conductive films, and the like around liquid crystal display devices by utilizing excellent optical homogeneity, transparency, low birefringence, etc. Can be used.

  The film of the present invention can be used by being attached to a polarizer. That is, it can be used as a polarizer protective film. Here, any conventionally known polarizer can be used as the polarizer. Specifically, for example, iodine can be contained in stretched polyvinyl alcohol to obtain a polarizer. Such a polarizer can be used as a polarizing plate by bonding the film of the present invention as a polarizer protective film.

  EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to this Example.

  Each physical property value of the film was measured as follows.

(1) Haze The haze was measured by using a turbidimeter NDH-300A manufactured by Nippon Denshoku Industries Co., Ltd. according to the method described in 6.4 of JIS K7105-1981.

(2) Total light transmittance Measured by using a turbidimeter NDH-300A manufactured by Nippon Denshoku Industries Co., Ltd., according to the method described in 5.5 of JIS K7105-1981.

(3) In-plane retardation Re and thickness direction retardation Rth
A 40 mm × 40 mm test piece was cut out from the film. Using an automatic birefringence meter (KOBRA-WR manufactured by Oji Scientific Co., Ltd.), the in-plane retardation Re was measured at a temperature of 23 ± 2 ° C. and a humidity of 50 ± 5% at a wavelength of 590 nm and an incident angle of 0 °. It was measured. The thickness d of the test piece measured using a digimatic indicator (manufactured by Mitutoyo Corporation), the refractive index n measured by an Abbe refractometer (manufactured by Atago Co., Ltd. 3T), the wavelength 590 nm measured by an automatic birefringence meter, and the surface The three-dimensional refractive index nx, ny, nz is obtained from the internal phase difference Re and the phase difference value in the 40 ° tilt direction, and the thickness direction phase difference Rth = | (nx + ny) / 2−nz | × d (|| is the absolute value) Represents).

(4) Surface appearance The appearance of the film was visually observed to evaluate the presence or absence of streak-like defects (die lines).

(5) Ratio of General Formula (1) in Imide Resin Using the product pellet as it was, IR spectrum was measured at room temperature using Travel IR manufactured by SensIR Technologies. From the obtained spectrum, the absorption intensity (Abs _Ester) attributed to the ester carbonyl group of 1720 cm ^-1, the imidization ratio from the ratio of the absorption intensity assignable to an imide carbonyl group of 1660cm ^-1 (Abs _imide) (Im % (IR)). Here, the imidation rate refers to the proportion of the imide carbonyl group in all carbonyl groups.

(Resin production example 1)
Polymethyl methacrylate (PMMA) resin (Sumitomo Chemical's Sumipex MH), which is an acrylic ester resin, is imidized with monomethylamine (Mitsubishi Gas Chemical Co., Ltd.), which is an imidizing agent, to produce an imidized PMMA resin. . The extruder used was a meshing type co-rotating twin screw extruder having a diameter of 15 mm. The set temperature of each temperature control zone of the extruder was 230 ° C., the screw rotation speed was 150 rpm, the methacrylic resin was supplied at 1.0 kg / hr, and the supply amount of monomethylamine was 3 parts by weight with respect to the methacrylic resin. A methacrylic resin was introduced from a hopper, and the resin was melted and filled with a kneading block, and then monomethylamine was injected from a nozzle. A seal ring was placed at the end of the reaction zone to fill the resin. By-products after the reaction and excess methylamine were devolatilized by reducing the pressure at the vent port to -0.08 MPa. The resin that came out as a strand from a die provided at the exit of the extruder was cooled in a water tank and then pelletized with a pelletizer. This imidized PMMA resin corresponds to an imide resin obtained by copolymerization of the unit represented by the general formula (1) and the unit represented by the general formula (2) described in the embodiment. Was 20 mol%.

(Resin production example 2)
A polymethyl methacrylate-styrene copolymer (MS) resin (the composition of the general formula (2) and the general formula (3) is 80 mol%: 20 mol%) is supplied at 2.0 kg / hr, and an imidizing agent is used. 40 parts of a certain monomethylamine (Mitsubishi Gas Chemical Co., Ltd.) was used to imidize in the same manner as in Production Example 1 to produce an imidized MS resin. This imidized MS resin is an imide obtained by copolymerizing the unit represented by the general formula (1), the unit represented by the general formula (2), and the unit represented by the general formula (3) described in the embodiment. Corresponding to the resin, the general formula (1) was 69 mol%.

(Resin production example 3)
(1) A methacrylic resin composition (core-shell polymer) was synthesized by the following method.

The following substances were charged into an 8 L polymerization apparatus equipped with a stirrer.
Deionized water 200 parts Sodium dioctylsulfosuccinate 0.25 parts Sodium formaldehyde sulfoxylate 0.15 parts Ethylenediaminetetraacetic acid-2-sodium 0.005 parts Ferrous sulfate 0.0015 parts

  After sufficiently replacing the inside of the polymerization apparatus with nitrogen gas to make it substantially free of oxygen, the internal temperature is set to 60 ° C., and 70% of butyl acrylate (BA) and methacrylic as raw materials for the acrylate ester-based crosslinked elastic particles 10 parts of a monomer mixture> 20 parts consisting of 2 parts of allyl methacrylate (AlMA) and 0.5 parts of cumene hydroxide (CHP) per 100 parts of a monomer mixture comprising 30% of methyl acid (MMA) Part / hour was continuously added, and after completion of the addition, polymerization was continued for another 0.5 hours to obtain acrylic ester-based crosslinked elastic particles. The polymerization conversion was 99.5% and the average particle size was 800 mm. Thereafter, 0.3 part of sodium dioctylsulfosuccinate was charged, the internal temperature was set to 60 ° C., and a monomer mixture 100 consisting of 10% styrene (St) and 90% MMA as raw materials for the methacrylate polymer. 80 parts of a monomer mixture consisting of 0.8 part of tert-dodecyl mercaptan (tDM) and 0.5 part of CHP is continuously added at a rate of 10 parts / hour, and polymerization is continued for another hour. A methacrylic resin composition (core-shell polymer) was obtained. The polymerization conversion rate was 99.0%. The obtained latex was salted out and coagulated with calcium chloride, washed with water and dried to obtain a resin powder (1) of a methacrylic resin composition (C). Furthermore, using a single screw extruder with a 40 mmφ vent, the cylinder temperature was set to 230 ° C., and melt kneading was performed to pelletize.

  (2) The methacrylic resin composition (core-shell polymer) obtained in (1) above is supplied at 2.0 kg / hr, and 10 parts of monomethylamine (manufactured by Mitsubishi Gas Chemical Co., Ltd.) as an imidizing agent is used. Imidization was conducted in the same manner as in Production Example 1 to produce an imide resin (core-shell polymer). General formula (1) was 51 mol%.

Example 1
100% by weight of the imide resin obtained in Production Example 1, 0.05 parts by weight of ethylenediamine / stearic acid / sebacic acid polycondensate and 0.05 parts by weight of zinc stearate were pelleted with an extruder. After drying at 5 ° C. for 5 hours, extrusion was performed at 240 ° C. using a 40 mm single screw extruder and a 400 mm wide T-die, and the sheet-like molten resin was cooled with a cooling drum to obtain a film having a width of about 300 mm and a thickness of 150 μm. The haze of this film was 0.30%, the total light transmittance was 92.5%, the in-plane retardation was 2 nm, and the retardation in the thickness direction was 3 nm. Further, the film surface was smooth without any irregularities that could be observed with the naked eye.

(Example 2)
The same procedure as in Example 1 was conducted except that 0.1 parts by weight of ethylenediamine / stearic acid / sebacic acid polycondensate was used as a lubricant. The haze of the obtained film was 0.40%, the total light transmittance was 91.5%, the in-plane retardation was 2 nm, and the retardation in the thickness direction was 3 nm. Further, the film surface was smooth without any irregularities that could be observed with the naked eye.

(Example 3)
The same operation as in Example 1 was performed except that 0.1 parts by weight of zinc stearate was used as a lubricant. The obtained film had a haze of 0.40%, a total light transmittance of 92.5%, an in-plane retardation of 2 nm, and a thickness direction retardation of 3 nm. Further, the film surface was smooth without any irregularities that could be observed with the naked eye.

Example 4
The same procedure as in Example 1 was performed except that 0.1 part by weight of a montanic acid ester (manufactured by Hoechst Japan, trade name: Hoechst-Wax E) was used as a lubricant. The obtained film had a haze of 0.70%, a total light transmittance of 91.5%, an in-plane retardation of 2 nm, and a thickness direction retardation of 4 nm. Further, the film surface was smooth without any irregularities that could be observed with the naked eye.

(Example 5)
The same procedure as in Example 1 was performed except that 0.1 parts by weight of an alkyl acrylate / alkyl methacrylate / styrene copolymer (trade name: PA-100, manufactured by Kaneka Corporation) was used as a lubricant. The haze of the obtained film was 0.50%, the total light transmittance was 92.2%, the in-plane retardation was 2 nm, and the retardation in the thickness direction was 3 nm. Further, the film surface was smooth without any irregularities that could be observed with the naked eye.

(Example 6)
The same operation as in Example 1 was carried out except that 5 parts by weight of an ethylenediamine / stearic acid / sebacic acid polycondensate was used as a lubricant. The haze of the obtained film was 1.50%, the total light transmittance was 90.2%, the in-plane retardation was 2 nm, and the retardation in the thickness direction was 3 nm. Further, the film surface was smooth without any irregularities that could be observed with the naked eye.

(Example 7)
100% by weight of the imide resin obtained in Production Example 2, 0.05 parts by weight of ethylenediamine / stearic acid / sebacic acid polycondensate and 0.05 parts by weight of zinc stearate were pelleted with an extruder. After drying at 5 ° C. for 5 hours, extrusion was performed at 240 ° C. using a 40 mm single screw extruder and a 400 mm wide T-die, and the sheet-like molten resin was cooled with a cooling drum to obtain a film having a width of about 300 mm and a thickness of 150 μm. The haze of this film was 0.38%, the total light transmittance was 91.5%, the in-plane retardation was 3 nm, and the retardation in the thickness direction was 3 nm. Further, the film surface was smooth without any irregularities that could be observed with the naked eye.

(Example 8)
The same operation as in Example 7 was carried out except that 0.1 parts by weight of an ethylenediamine / stearic acid / sebacic acid polycondensate was used as a lubricant. The obtained film had a haze of 0.40%, a total light transmittance of 91.0%, an in-plane retardation of 2 nm, and a thickness direction retardation of 3 nm. Further, the film surface was smooth without any irregularities that could be observed with the naked eye.

Example 9
The same operation as in Example 7 was performed except that 0.1 parts by weight of zinc stearate was used as a lubricant. The haze of the obtained film was 0.44%, the total light transmittance was 91.3%, the in-plane retardation was 2 nm, and the retardation in the thickness direction was 4 nm. Further, the film surface was smooth without any irregularities that could be observed with the naked eye.

(Example 10)
The same procedure as in Example 7 was performed except that 0.1 part by weight of a montanic acid ester (manufactured by Hoechst Japan, trade name: Hoechst-Wax E) was used as a lubricant. The obtained film had a haze of 0.72%, a total light transmittance of 90.3%, an in-plane retardation of 2 nm, and a thickness direction retardation of 3 nm. Further, the film surface was smooth without any irregularities that could be observed with the naked eye.

(Example 11)
The same procedure as in Example 7 was performed except that 0.1 part by weight of octadecinol (stearyl alcohol) (trade name: Calcoal 8098) was used as a lubricant. The obtained film had a haze of 0.66%, a total light transmittance of 91.0%, an in-plane retardation of 3 nm, and a thickness direction retardation of 5 nm. Further, the film surface was smooth without any irregularities that could be observed with the naked eye.

(Example 12)
The same procedure as in Example 1 was performed except that 0.1 parts by weight of an alkyl acrylate / alkyl methacrylate / styrene copolymer (trade name: PA-100, manufactured by Kaneka Corporation) was used as a lubricant. The haze of the obtained film was 0.48%, the total light transmittance was 91.5%, the in-plane retardation was 2 nm, and the retardation in the thickness direction was 3 nm. Further, the film surface was smooth without any irregularities that could be observed with the naked eye.

(Example 13)
The same operation as in Example 1 was carried out except that 5 parts by weight of an ethylenediamine / stearic acid / sebacic acid polycondensate was used as a lubricant. The obtained film had a haze of 1.60%, a total light transmittance of 90.0%, an in-plane retardation of 3 nm, and a thickness direction retardation of 4 nm. Further, the film surface was smooth without any irregularities that could be observed with the naked eye.

(Example 14)
The film prepared in Example 1 was preheated to 130 ° C. with a preheating roll of a longitudinal stretching machine, then once cooled to 128 ° C., and stretched 1.8 times with a stretching roll. Subsequently, after preheating to 132 degreeC in the preheating zone of a horizontal extending | stretching machine, it extended | stretched 1.8 times in the extending | stretching zone of 130 degreeC, and obtained the biaxially stretched film sequentially. The film had a thickness of 45 μm, a haze of 0.20%, a total light transmittance of 92.2%, an in-plane retardation of 2 nm, and a thickness direction retardation of 3 nm. Further, the film surface was smooth without any irregularities that could be observed with the naked eye.

(Example 15)
The film prepared in Example 7 was preheated to 145 ° C. with a preheating roll of a longitudinal stretching machine, then cooled to 143 ° C. and stretched 1.8 times with a stretching roll. Subsequently, after preheating to 147 degreeC in the preheating zone of a horizontal extending | stretching machine, it extended | stretched 1.8 time in a 145 degreeC extending zone, and obtained the biaxially stretched film sequentially. This film had a thickness of 40 μm, a haze of 0.12%, a total light transmittance of 91.0%, an in-plane retardation of 2 nm, and a thickness direction retardation of 3 nm. Further, the film surface was smooth without any irregularities that could be observed with the naked eye.

(Example 16)
The film prepared in Example 1 was preheated to 128 ° C. with a preheating roll of a longitudinal stretching machine, and then stretched 1.8 times with a stretching roll at the same temperature. Next, after preheating to 130 ° C. in the preheating zone of the transverse stretching machine, the film was stretched 1.8 times in the stretching zone at the same temperature to obtain a sequentially biaxially stretched film. The film had a thickness of 45 μm, a haze of 0.15%, a total light transmittance of 92.0%, an in-plane retardation of 2 nm, and a thickness direction retardation of 3 nm. Further, the film surface was smooth without any irregularities that could be observed with the naked eye.

(Example 17)
The film prepared in Example 7 was preheated to 156 ° C. with a preheating roll of a longitudinal stretching machine, and then stretched 1.8 times with a stretching roll at the same temperature. Next, after preheating to 158 ° C. in the preheating zone of the transverse stretching machine, the film was stretched 1.8 times in the stretching zone at the same temperature to obtain a sequentially biaxially stretched film. The thickness of this film was 45 μm, the haze was 0.15%, the total light transmittance was 91.3%, the in-plane retardation was 2 nm, and the retardation in the thickness direction was 3 nm. Further, the film surface was smooth without any irregularities that could be observed with the naked eye.

(Example 18)
100% by weight of the imide resin obtained in Production Example 3, 0.05 parts by weight of ethylenediamine / stearic acid / sebacic acid polycondensate and 0.05 parts by weight of zinc stearate were pelleted with an extruder, 100 After drying at 5 ° C. for 5 hours, extrusion was performed at 240 ° C. using a 40 mm single screw extruder and a 400 mm wide T-die, and the sheet-like molten resin was cooled with a cooling drum to obtain a film having a width of about 300 mm and a thickness of 150 μm. The haze of this film was 0.34%, the total light transmittance was 92.2%, the in-plane retardation was 3 nm, and the retardation in the thickness direction was 4 nm. Further, the film surface was smooth without any irregularities that could be observed with the naked eye.

(Comparative Example 1)
The same procedure as in Example 1 was performed except that the lubricant was not used. The obtained film had a haze of 0.71%, a total light transmittance of 90.2%, an in-plane retardation of 2 nm, and a thickness direction retardation of 3 nm. Moreover, there were many irregularities on the film surface, and a smooth film could not be obtained. Moreover, when smoothness was evaluated, there were many unevenness | corrugations on the film surface, and the smooth film was not obtained. Specifically, the smoothness of the film was so bad that it could be discriminated sufficiently visually.

(Comparative Example 2)
The same operation as in Example 7 was carried out except that the lubricant was not used. The obtained film had a haze of 0.72%, a total light transmittance of 91.0%, an in-plane retardation of 2 nm, and a thickness direction retardation of 3 nm. Moreover, there were many irregularities on the film surface, and a smooth film could not be obtained. Moreover, when smoothness was evaluated, there were many unevenness | corrugations on the film surface, and the smooth film was not obtained. Specifically, the smoothness of the film was so bad that it could be discriminated sufficiently visually.

Claims (11)

The resin composition formed containing the following (A) and (B).
(A) Imido resin (B) fatty acid having a unit represented by the following general formula (1), a unit represented by the following general formula (2) and / or a unit represented by the following general formula (3) One type selected from the group consisting of amide (amide) lubricants, fatty acid ester lubricants, metal soap lubricants, polymer lubricants, aliphatic hydrocarbon lubricants, aliphatic alcohol lubricants, and aliphatic acid lubricants More lubricant
(However, R ¹ and R ² each independently represent hydrogen or an alkyl group having 1 to 8 carbon atoms, and R ³ represents an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, Or a substituent containing an aromatic ring having 5 to 15 carbon atoms.)
(However, R ⁴ and R ⁵ each independently represent hydrogen or an alkyl group having 1 to 8 carbon atoms, and R ⁶ represents an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, Or a substituent containing an aromatic ring having 5 to 15 carbon atoms.)
(However, R ⁷ represents hydrogen or an alkyl group having 1 to 8 carbon atoms, and R ⁸ represents an aryl group having 6 to 10 carbon atoms.)   The resin composition according to claim 1, wherein the content of the lubricant (B) in the resin composition is 0.01 to 1% by weight.   The resin composition according to claim 1, wherein the haze is 1% or less and the total light transmittance is 85% or more.   The molded object which consists of a resin composition in any one of Claim 1 to 3.   A film comprising the resin composition according to claim 1. 6. A molded body and a film comprising the resin composition according to claim 1, wherein the orientation birefringence is 0 or more and 0.1 × 10 ⁻³ or less.   The film according to any one of claims 1 to 6, wherein an in-plane retardation is 10 nm or less and a thickness direction retardation is 20 nm or less.   The film according to claim 5, which is obtained by a melt extrusion method.   The film according to any one of claims 5 to 8, wherein the film is stretched.   10. The method for producing a film according to claim 5, wherein the film is formed by a melt extrusion method.   The method for producing a film according to claim 10, further comprising a step of stretching.