WO2018216890A1 - 폴리이미드 적층필름 롤체 및 그 제조 방법 - Google Patents
폴리이미드 적층필름 롤체 및 그 제조 방법 Download PDFInfo
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- WO2018216890A1 WO2018216890A1 PCT/KR2018/003070 KR2018003070W WO2018216890A1 WO 2018216890 A1 WO2018216890 A1 WO 2018216890A1 KR 2018003070 W KR2018003070 W KR 2018003070W WO 2018216890 A1 WO2018216890 A1 WO 2018216890A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B43/00—Operations specially adapted for layered products and not otherwise provided for, e.g. repairing; Apparatus therefor
Definitions
- the present invention relates to a method for producing a roll of a polyimide laminated film in which different kinds of polyimide films are laminated.
- Polyimide (PI) is a polymer having a relatively low crystallinity or mostly noncrystalline structure. It is easy to synthesize and can produce a thin film film. It also has advantages of not requiring a crosslinking agent for curing, transparency, rigid chain structure Is a polymer material with excellent heat resistance, chemical resistance, excellent mechanical properties, electrical properties and dimensional stability. It is widely used in electric and electronic materials such as automobile, aerospace, flexible circuit board, liquid crystal alignment film for LCD, have.
- the polyimide resin has excellent heat resistance and mechanical characteristics, and is useful as a display device for various liquid crystal display devices and organic EL display devices, for example, a large-sized display such as a television, a small-size display device such as a mobile phone, a personal computer, And is used as a substrate for various displays such as displays.
- an organic EL display device can be manufactured by replacing a conventional glass substrate with a polyimide substrate to form a thin film transistor (hereinafter, TFT), and then sequentially stacking an electrode, a light emitting layer, and an electrode.
- TFT thin film transistor
- the polyimide substrate is manufactured by the solvent casting method, in which the polyamic acid solution as the polyimide precursor solution is coated on the glass substrate.
- a problem to be solved by the present invention is to provide a laminated polyimide film roll capable of more efficiently providing a polyimide substrate for flexible display having excellent physical properties.
- Another object to be solved by the present invention is to provide a method for producing the laminated polyimide film roll.
- a further object of the present invention is to provide a method for producing a laminate of a polyimide film and an inorganic substrate using the laminated film roll.
- the present invention also provides a flexible device manufacturing method using the laminated film roll.
- the second polyimide film has a glass transition temperature of 350 ⁇ ⁇ or more as measured at a heating rate of 20 ⁇ ⁇ / min.
- the thickness of the first polyimide film may be 60 to 500 ⁇ , and the thickness of the second polyimide film may be 0.1 to 50 ⁇ .
- the first polyimide film may be prepared by polymerizing a tetracarboxylic dianhydride having a structure represented by the following formula (1) or (3) and a diamine having a structure represented by the formula (2) or (4).
- the first polyimide film has a thermal decomposition temperature of 450 ° C or higher, a modulus of 9-11 GPa, a tensile strength of 400-600 MPa, a yield strength of 130-200 MPa, a thermal window coefficient (CTE) of 100 Lt; 0 > C to 20 ppm / [deg.] C in the temperature range of about 500 to about 500 [deg.] C.
- CTE thermal window coefficient
- the residual stress of the laminated film roll may be 0.1 MPa to 200 MPa.
- the second polyimide film when the second polyimide film is prepared from a fluorine-based polyamic acid, 4,4 '- (hexafluoroisopropylidene) diphthalic anhydride and pyromellitic dianhydride as acid dianhydrides and diamine 2,2'-bis (trifluoromethyl) benzidine as a polymerization component.
- the second polyimide film when produced from a siloxane-based polyamic acid, it comprises (A) at least one acyl compound selected from the group consisting of a tetracarboxylic acid dianhydride and a reactive derivative thereof (I) and / or (ii), and (B) an imino-forming compound.
- the component (A) comprises (A-1) an acyl compound having a structural unit represented by the formula (7);
- the component (B) comprises (B-1) an imino-forming compound having a structural unit represented by the formula (7);
- the polyamic acid for preparing the second polyimide film may have a silicon compound concentration of 3 to 50% by weight calculated by the following formula (1).
- the content of the imino-forming compound having the structural unit represented by the above formula (B-1) in the component (B) is 5 to 5% by weight based on the total amount of the component (B) To 70% by weight.
- the number-average molecular weight calculated from the amine value of the imino-forming compound having the structural unit represented by the formula (B-1) in the component (B) may be 500 to 10,000.
- the polyamic acid may be prepared by mixing the component (A) and the component (B) in a molar ratio (component (B) / component (A)) of from 0.8 to 1.2 And the like.
- an acid anhydride such as N, N'-bis (1,2-cyclohexanedicarboxylic acid anhydride-4-yl) , 3'-diaminodiphenylsulfone (PSHT), N, N'-bis (1,2-cyclohexanedicarboxylic anhydride-4-yl) carbonyl-1,4-phenylenediamine (PPHT) N, N'-1,4-phenylenebis [1,3-dihydro-1,3-dioxo-5-isobenzofurancarbamide] 3-dihydro-1,3-dioxo-5-isobenzofurancarboxamide], PPTA), N, N'-1,3-phenylenebis [ (N, N'-1,3-Phenylenebis [1,3-dihydro-1,3-dioxo-5-isobenzofurancarboxamide],
- the second polyimide film has a pore size of 100 nm or less when the cross section of the film is observed, and the pore shape may be a sphere having an average diameter of 10 to 50 nm.
- the second polyimide film may have a retardation in the plane direction of 5 nm or less.
- the second polyimide film may have a yellowness index (YI) of 50 or less when the thickness is 50 mu m.
- YI yellowness index
- the present invention also relates to
- the present invention also provides a method of producing a self-supporting laminated film roll body.
- a tensile force of 0.1 to 200 MPa may be applied to the first polyimide film.
- the polyamic acid solution may comprise greater than or equal to 50 wt% solvent based on the weight of the organic solvent filler, which is a positive LogP distribution coefficient.
- the heating and curing of the coated polyamic acid solution may proceed below the glass transition temperature of the second polyimide film in the range of 250 to 450 ⁇ in a nitrogen atmosphere.
- the present invention also provides a method of manufacturing a laminated film, comprising the steps of: forming a device on a surface of a second polyimide film of a supplied polyimide laminated film by winding the above laminated film roll; And
- the present invention relates to a roll body manufactured by manufacturing a polyimide laminated film in which a polyimide film formed by using a solution casting process and a high heat resistant polyimide film are laminated and winding the laminated film,
- the flexible substrate having excellent physical properties can be continuously supplied, and the yield and efficiency of the continuous manufacturing process of the flexible device can be improved.
- FIG. 1 shows a process for producing a polyimide film roll according to a conventional method.
- Fig. 2 shows a method of laminating a polyimide film produced by a conventional method on a glass substrate.
- Fig. 3 shows a manufacturing process of a laminated film roll according to the present invention.
- FIG. 4 shows a method of laminating a laminated film supplied from a laminated film roll according to the present invention on a glass substrate.
- substituted means that at least one hydrogen contained in the compound or organic group is substituted with a halogen atom, an alkyl group having 1 to 10 carbon atoms, a halogenated alkyl group, a cycloalkyl group having 3 to 30 carbon atoms, an aryl group having 6 to 30 carbon atoms, Substituted with a substituent selected from the group consisting of an alkoxy group having 1 to 10 carbon atoms, a carboxylic acid group, an aldehyde group, an epoxy group, a cyano group, a nitro group, an amino group, a sulfonic acid group and derivatives thereof.
- a layer, film, film, substrate, or the like is referred to herein as being “on” or “on” another part, it also includes the case where there is another part in the middle, do.
- a portion such as a layer, a film, a film, a substrate, or the like is referred to as being 'under' another portion, it includes not only a case where the other portion is 'directly below' but also a case where there is another portion in between.
- a polyamic acid is coated on a glass substrate, and then curing is performed in a stepwise manner in an oven, which requires a long process time and low production yield.
- the method of laminating the polyimide film on the carrier substrate can increase the production yield by shortening the processing time, but there is a problem that it is difficult to wind the polyimide film produced by the static electricity in the conventional polyimide manufacturing process. Therefore, a polyimide film was prepared by dispersing inorganic particles such as silica particles in a polyamic acid solution for anti-blocking as shown in FIG. However, as shown in FIG.
- the polyimide film when a polyimide film is manufactured by a tenter method, tensile force is applied only in the traveling direction.
- the polyimide film may have a difference in physical properties between MD (longitudinal direction) and TD (width direction) And may cause warpage of the substrate due to heat shrinkage during the subsequent process.
- a PET (polyethylene terephthalate) film is used as a protective film of the polyimide film for a substrate, and the heat resistance of the PET film is lower than that of the polyimide. Therefore, as shown in FIG. 2B, when used in a hot pressing process at a high temperature, shrinkage of the PET film may occur, which may cause warping of the substrate. Further, in the case of the PET protective film, the adhesive strength to the polyimide film is increased by the heat pressing process, and when the protective film is peeled off, peeling of the polyimide film and the inorganic substrate may occur. Therefore, there are many problems in using the PET protective film together with the polyimide film in the hot pressing process.
- the present invention provides a laminated roll body of a polyimide film and a method of manufacturing the same, which enable a flexible substrate to be continuously manufactured without using an anti-blocking agent such as inorganic particles or an PET protective film do.
- the present invention is a laminated film laminated on a first polyimide film and a first polyimide film and wound with a laminated film comprising a second polyimide film made of a fluorine-based, siloxane-based or amine-based polyamic acid, Wherein the second polyimide film has a glass transition temperature of 350 ⁇ ⁇ or higher as measured at a heating rate of 20 ⁇ ⁇ / min.
- a second polyimide film made of a fluorine-based, siloxane-based or amine-based polyamic acid and having a glass transition temperature of 350 ° C or higher measured at a heating rate of 20 ° C / min is laminated on a first polyimide film using a carrier film
- the roll body can provide the polyimide film as a rolled body without using an antistatic additive such as inorganic particles, and can be conveniently used in a continuous manufacturing process of a flexible device since it does not require a PET protective film.
- the present invention also provides a method for producing the laminated film roll body
- the first polyimide film is self-supporting not supported by a separate support substrate. ≪ Desc / Clms Page number 5 >
- the present invention relates to a process for producing a polyimide laminated film on which a polyimide film is formed on a polyimide substrate by a solution casting method using a polyamic acid with a self-supporting polyimide film as a base, It is possible to provide the polyimide film as a wound roll in the form of a roll without using a preventive additive, which can be conveniently used in a continuous production process requiring a polyimide film thereafter.
- the thickness of the first polyimide film may be 60 to 500 ⁇ , preferably 60 to 300 ⁇ .
- the polyimide film can be used alone as a supporting substrate without using a non-flexible supporting substrate, and it is possible to wind the polyimide substrate and the polyimide film formed on the substrate together. If the thickness of the first polyimide film is less than 60 ⁇ , it may not be possible to sufficiently fulfill its role as a substrate such as tearing or wrinkling in the polyimide manufacturing process by the solution casting process. If the thickness of the film is more than 500 ⁇ This can make winding difficult.
- a tensile force of a predetermined magnitude may be applied to the film while the first polyimide film is put into a manufacturing process, for example, a tensile force of 0.1 MPa or more and 200 MPa or less or 0.1 to 100 MPa may be applied. This applies tension to the film to keep the film firm and flat so that the second polyimide film formed on the first polyimide film can be formed more evenly.
- the first polyimide film and the second polyimide film may exhibit an adhesive strength of about 1 N / cm or more, or about 2 N / cm or more, or about 3 to 5 N / cm, Or 0.1 N / cm or less, or about 0.001 to 0.05 N / cm.
- the first polyimide film may be a high heat resistant polyimide film.
- the first polyimide film may be a tetracarboxylic acid dianhydride having a structure represented by the following formula (1) or (3) May be prepared by polymerizing a diamine having the structure of the formula (2) or (4).
- the first polyimide film is prepared by polymerizing the tetracarboxylic dianhydride of the formula (1) and the diamine of the formula (2), or the tetracarboxylic acid dianhydride of the formula (3) and the diamine Or the like.
- the first polyimide film has a high decomposition temperature (Td) of 450 ° C or higher, or 450 ° C to 600 ° C.
- Td decomposition temperature
- the first polyimide film has a coefficient of thermal expansion of about 20 ppm / ° C or less, about 17 ppm / ° C or less, or about -20 to 20 ppm / ; CTE) and 450 ° C or more, or 1% pyrolysis temperature (Td1%) of 470 ° C or more.
- the modulus of the first polyimide film may be 9 to 11 GPa.
- the first polyimide film may have a tensile strength of 400 to 600 MPa and a yield strength of 130 to 200 MPa.
- the first polyimide film satisfying the above requirements does not affect the transparency and optical characteristics of the second polyimide film by being cleanly peeled off from the second polyimide film used as the flexible substrate.
- the residual stress of the laminated roll may be 0.1 MPa to 100 MPa, preferably 0.1 to 10 MPa. Such a low residual stress can suppress the warping of the laminated substrate.
- the second polyimide film used in the laminated roll according to the present invention is made of a fluorine-based, siloxane-based or amine-based polyamic acid, and has a glass transition temperature of 350 ° C or higher measured at a heating rate of 20 ° C / min.
- the diamine used in the production of the fluorine-containing, siloxane-based or amine-based polyamic acid used in the production of the second polyimide film may be a fluorine-, siloxane- or amine- But it is not limited to these diamines.
- At least one hydrogen atom present in the divalent organic groups of 5a to 5t is a halogen atom selected from -F, -Cl, -Br and -I, a hydroxyl group (-OH), a thiol group (-SH) May be substituted with a substituent selected from a group (-NO 2), a cyano group, an alkyl group having 1 to 10 carbon atoms, a halogenoalkoxy having 1 to 4 carbon atoms, a halogenoalkyl having 1 to 10 carbon atoms, or an aryl group having 6 to 20 carbon atoms .
- the tetracarboxylic acid dianhydride used in the production of the fluorine-containing, siloxane-based or amine-based polyamic acid used in the production of the second polyimide film may be a fluorine-, siloxane- or amine-based tetracarboxylic acid dianhydride, May include one or more tetravalent organic groups selected from the following formulas (6a) to (6r), but are not limited thereto.
- V is an integer of 0 or 1
- x is an integer of 1 to 10;
- the at least one hydrogen atom present in the tetravalent organic group of 6a to 6r is a halogen atom selected from -F, -Cl, -Br and -I, a hydroxyl group (-OH), a thiol group (-SH) , A nitro group (-NO 2 ), a cyano group, an alkyl group having 1 to 10 carbon atoms, a halogenoalkoxy group having 1 to 4 carbon atoms, a halogenoalkyl group having 1 to 10 carbon atoms, or an aryl group having 6 to 20 carbon atoms .
- the second polyimide film produced using the fluorine-based polyamic acid may be prepared by reacting 4,4 '- (hexafluoroisopropylidene) diphthalic acid anhydride and pyromellitic acid dianhydride as acid dianhydrides, 2 , 2'-bis (trifluoromethyl) benzidine as a polymerization component.
- the second polyimide film when the siloxane-based polyamic acid, it may include a structural unit represented by the following formula (7) in the molecular structure.
- R1 is independently a monovalent organic group having 1 to 20 carbon atoms, and n is an integer of 1 to 200.
- Examples of the hydrocarbon group having 1 to 20 carbon atoms represented by R 1 include an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 20 carbon atoms.
- the alkyl group having 1 to 20 carbon atoms is preferably an alkyl group having 1 to 10 carbon atoms. Specific examples thereof include a methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, t-butyl group, pentyl group, .
- the cycloalkyl group having 3 to 20 carbon atoms is preferably a cycloalkyl group having 3 to 10 carbon atoms, and specific examples thereof include a cyclopentyl group and a cyclohexyl group.
- the aryl group having 6 to 20 carbon atoms is preferably an aryl group having 6 to 12 carbon atoms, and specific examples thereof include a phenyl group, a tolyl group and a naphthyl group.
- Examples of the organic group having 1 to 20 carbon atoms including an oxygen atom include an organic group containing a hydrogen atom, a carbon atom and an oxygen atom, and specific examples include organic groups having 1 to 20 carbon atoms and having an ether bond, a carbonyl group and an ester group, .
- Examples of the organic group having 1 to 20 carbon atoms having an ether bond include an alkoxy group having 1 to 20 carbon atoms, an alkenyloxy group having 2 to 20 carbon atoms, an alkynyloxy group having 2 to 20 carbon atoms, an aryloxy group having 6 to 20 carbon atoms, 20 alkoxyalkyl groups, and the like. Specific examples include methoxy, ethoxy, propoxy, isopropyloxy, butoxy, phenoxy, propenyloxy, cyclohexyloxy and methoxymethyl.
- Examples of the organic group having 1 to 20 carbon atoms having a carbonyl group include an acyl group having 2 to 20 carbon atoms. Specific examples thereof include an acetyl group, a propionyl group, an isopropionyl group, and a benzoyl group.
- Examples of the organic group having 1 to 20 carbon atoms and having an ester group include acyloxy groups having 2 to 20 carbon atoms. Specific examples thereof include an acetyloxy group, a propionyloxy group, an isopropionyloxy group and a benzoyloxy group.
- Examples of the organic group having 1 to 20 carbon atoms including a nitrogen atom include an organic group containing a hydrogen atom, a carbon atom and a nitrogen atom. Specific examples thereof include an imidazole group, a triazole group, a benzimidazole group and a benztriazole group. .
- Examples of the organic group having 1 to 20 carbon atoms including an oxygen atom and a nitrogen atom include organic groups including a hydrogen atom, a carbon atom, an oxygen atom and a nitrogen atom, and specific examples thereof include oxazole group, oxadiazole group, benzoxazole group, Benzoxadiazole group and the like.
- At least one of the plurality of R < 1 > in the above-mentioned formula (7) includes an aryl group because the polyimide-based film to be obtained effectively avoids warping and twisting. More specifically, it is preferable that the plurality of R 1 is an alkyl group having 1 to 10 carbon atoms and an aryl group having 6 to 12 carbon atoms.
- the ratio of the alkyl group (i) to the aryl group (ii) in all R 1 in the structural unit (1) is within the above range, occurrence of bending and twisting of the obtained polyimide-based film can be more effectively avoided.
- the alkyl group (i) having 1 to 10 carbon atoms is preferably a methyl group, and the aryl group (ii) having 6 to 12 carbon atoms is preferably a phenyl group.
- N in the formula (1) is an integer of 1 to 200, preferably 3 to 200, more preferably 10 to 200, more preferably 20 to 150, still more preferably 30 to 100, And is an integer of 35 to 80.
- n in the above formula (1) is within the above range, the polyimide obtained from the polyamic acid is likely to form a micro-phase separation structure, so that warping and twisting of the obtained polyimide-based film can be suppressed, Or the mechanical strength is suppressed.
- the polyamic acid having the structural unit 7 is preferably selected from the group consisting of (A) a component comprising at least one acyl compound selected from the group consisting of a tetracarboxylic acid dianhydride and a reactive derivative thereof (Hereinafter also referred to as " component (B) " in the present invention) containing an imino-forming compound.
- an acyl compound having a structural unit (A-1) (hereinafter also referred to as "compound (A-1)") is used as the component (A) (Hereinafter, also referred to as " compound (B-1) "))
- both the compound (A-1) and the compound (B-1) may be used. According to this reaction, it is possible to obtain a polyamic acid according to the structure of the starting compound to be used and a polyamic acid having a structural unit derived from the compound in an amount depending on the amount of the starting compound to be used.
- (A) comprises at least one acyl compound selected from a tetracarboxylic acid dianhydride and a reactive derivative thereof. And preferably at least one compound selected from the group consisting of the compound (A-1) and the acyl compound (A-2) other than the compound (A-1).
- Specific examples of the compound (A-1) include at least one acyl compound selected from a tetracarboxylic acid dianhydride having a structural unit 7 and a reactive derivative thereof, Include compounds represented by the formulas (8A), (8B) and (8C).
- the reactive derivative include a tetracarboxylic acid having a structural unit 7, an acid esterified product of the tetracarboxylic acid, and an acid chloride of the tetracarboxylic acid.
- R1 and n are each independently the same as R1 and n in the above formula (7).
- each R2 independently represents a divalent hydrocarbon group of 1 to 20 carbon atoms.
- R11 independently represents a hydrogen atom or a monovalent organic group having 1 to 20 carbon atoms, and as the monovalent organic group having 1 to 20 carbon atoms, R1 in the formula (8) And monovalent organic groups having 1 to 20 carbon atoms.
- Examples of the divalent hydrocarbon group having 1 to 20 carbon atoms in R2 include a methylene group, an alkylene group having 2 to 20 carbon atoms, a cycloalkylene group having 3 to 20 carbon atoms, and an arylene group having 6 to 20 carbon atoms.
- the alkylene group having 2 to 20 carbon atoms is preferably an alkylene group having 2 to 10 carbon atoms, and examples thereof include a dimethylene group, a trimethylene group, a tetramethylene group, a pentamethylene group and a hexamethylene group.
- the cycloalkylene group having 3 to 20 carbon atoms is preferably a cycloalkylene group having 3 to 10 carbon atoms, and examples thereof include a cyclobutylene group, a cyclopentylene group, a cyclohexylene group, and a cycloheptylene group.
- the arylene group having 6 to 20 carbon atoms is preferably an arylene group having 6 to 12 carbon atoms, and examples thereof include a phenylene group and a naphthylene group.
- compound A-1 preferably has a number average molecular weight of 200 to 10,000, more preferably 500 to 8,000 .
- (A) is contained in an amount of 10 to 60 wt% based on 100 wt% of the total acyl compound (component (A)) when the component (A) %, More preferably from 20 to 50 wt%, even more preferably from 25 to 50 wt%, particularly preferably from 30 to 50 wt%.
- the amount of the compound (A-1) to be used is preferably within the above range.
- the preferable amount of the total acyl compound (component (A)) of the compound (A-1) based on 100% by weight of the total amount of the compound (A-1) is the case where the compound (B-1) is not used in the synthesis of the polyamic acid,
- the compound (A-1) and the compound (B-1) are used as the raw materials in the synthesis of the mixed acid, the total amount of the compound (A-1) Of the total amount of the water-soluble polymer (A).
- components containing at least one tetravalent organic group selected from the above-mentioned formulas (6a) to (6r) may be used together.
- the component (B) is an imino-forming compound.
- imino-forming compound refers to a compound which reacts with the component (A) to form an imino (group), and specifically includes a diamine compound, a diisocyanate compound and a bis (trialkylsilyl) have.
- the component (B) preferably includes at least one member selected from the group consisting of the compound (B-1) and the imino-forming compound (B-2) other than the compound (B-1).
- Examples of the imino-forming compound having (B-1) structural unit 7 include compounds represented by the following formulas (9) and (9A).
- R1 and n are each independently the same as R1 and n in the above formula (8), and the preferable range is also the same.
- R11 is the same as R11 in the above formulas (8A) and (8C).
- R 3 in the formula (8), (8A), (8B) and (8C) represents a divalent hydrocarbon group having 1 to 20 carbon atoms, The same groups as the divalent hydrocarbon groups of 1 to 20, and the like.
- the compound (B-1) preferably has a number average molecular weight calculated from amine value of 500 to 10,000, , More preferably from 3,000 to 8,000.
- the imino-forming compound (B-1) may be used singly or in combination of two or more.
- (B) is added to 100% by weight of the total imino-forming compound (component (B)) when the component (B) comprises the imino-forming compound (B- )
- the amount of the imino-forming compound (B-1) to be used is preferably within the above range.
- components containing at least one tetravalent organic group selected from the above-mentioned formulas (6a) to (6r) may be used together.
- the components (A) and (B) are reacted in a range where the molar ratio of the components (A) and (B) (component (B) / component (A) , And more preferably in the range of 0.95 to 1.0.
- the molar ratio of the acyl compound (A) to the iminoform (B) is less than 0.8 equivalents or exceeds 1.2 equivalents, the molecular weight becomes small, making it difficult to form a polyimide-based film.
- the siloxane-based polyamic acid for forming the second polyimide film preferably has a silicon compound concentration of 3 to 50%, more preferably 5 to 40%, and more preferably 8 to 30% Is more preferable.
- the “weight of the silicone compound” refers to the weight of all the compounds having the structural unit represented by the above formula (1).
- the second polyimide film made of the siloxane-based polyamic acid may have a pore diameter of 100 nm or less when the cross section of the film is observed, and the shape of pores may be a sphere having an average diameter of 10 to 50 nm.
- This void shape can serve as a sponge that can alleviate the substrate warping phenomenon caused by the CTE difference with the first polyimide film.
- the retardation in the plane direction of the second polyimide film is 5 nm or less, because if the thickness is 5 nm or more, the reflectance of the front reflection is affected by light reflection by an external light source.
- the second polyimide film when the second polyimide film is prepared from an amine-based polyamic acid, it has an amide bond in its molecular structure and an amide bond is contained in the tetracarboxylic acid dianhydride and / or diamine .
- the tetracarboxylic dianhydride and the diamine may be reacted at a molar ratio of 1: 0.8 to 1: 1.2 or 1.1: 1 to 1: 1.1 in the preparation of the polyimic acid used in the production of the first polyimide film and the second polyimide film have.
- the weight average molecular weight (Mw) of the polyamic acid is preferably 10,000 to 1,000,000, more preferably 10,000 to 200,000, and still more preferably 20,000 to 150,000.
- the number average molecular weight (Mn) is preferably 5,000 to 10,000,000, more preferably 5,000 to 500,000, and particularly preferably 20,000 to 200,000. If the weight average molecular weight to number average molecular weight of the polyamic acid is less than the above lower limit, the strength of the coating film may be lowered. In addition, the coefficient of linear expansion of the obtained polyimide-based film may rise more than necessary.
- the weight average molecular weight to the number average molecular weight of the polyamic acid exceeds the upper limit, the viscosity of the composition for forming a polyimide-based film increases. Therefore, the composition can be added to the composition The amount of the polyamic acid is decreased, so that the film thickness precision such as the flatness of the resulting coating film may be deteriorated.
- the reaction of the tetracarboxylic acid dianhydride with the diamine can be carried out according to a conventional method for producing a polyamic acid such as solution polymerization. Specifically, it can be produced by dissolving a diamine in an organic solvent, and then adding a tetracarboxylic acid dianhydride to the resultant mixed solution to effect polymerization reaction.
- the reaction can be carried out under an inert gas or a nitrogen stream and can be carried out under anhydrous conditions.
- the polymerization reaction may be carried out at a temperature of -20 to 60 ° C, preferably 0 to 45 ° C. If the reaction temperature is too high, the reactivity may become high and the molecular weight may become large, and the viscosity of the polyimide precursor solution may increase, which may be unfavorable in the process.
- the polyimide precursor solution prepared according to the above-described production method contains a solid content in an amount such that the solution has an appropriate viscosity in consideration of fairness such as coating and application properties.
- the content of the composition can be controlled such that the total polyimide precursor solution content is 5 to 20 wt%, preferably 8 to 18 wt%, more preferably 8 to 12 wt% have.
- the polyimide precursor solution can be adjusted to have a viscosity of 2,000 cP or more, or 3,000 cP or more, and the viscosity of the polyimide precursor solution is 10,000 cP or less, preferably 9,000 cP or less, more preferably 8,000 cP or less It is preferable to adjust the viscosity so as to have a viscosity.
- the viscosity of the polyimide precursor solution exceeds 10,000 cP, the efficiency of defoaming at the time of forming the polyimide layer is lowered, and the efficiency of the process may be deteriorated.
- the produced film may also have electrical , Optical and mechanical properties may be degraded.
- the organic solvent contained in the polyimide precursor solution of the present invention may be the same as the organic solvent used in the synthesis reaction.
- the organic solvent may be an organic solvent having a positive distribution coefficient (Log P) measured at 25 ° C
- the organic solvent having a positive LogP is N, N-diethylacetamide (N, N- diethylacetamide, DEAc), N, N-diethylformamide (DEF), N-ethylpyrrolidone (NEP), dimethylpropionamide (DMPA), diethylpropionamide ), Or a mixture thereof may be used alone or in combination with a solvent in which LogP is negative.
- the solvent having a distribution coefficient (LogP) is at least 50% by weight or at least 70% by weight based on the total weight of the solvent.
- the partition coefficient means the compound concentration ratio in each solvent when an arbitrary compound is mixed with two solvent mixtures (water and octanol) which do not mix and equilibrium is established. The ratio of the concentration of the non-ionized compound to the concentration is taken as logP.
- a partition coefficient is predicted by summing up the degree to which a single atom or molecule constituting a molecule contributes to the LogP of a molecule.
- the ACD / Percepta platform's ACD / LogP module from ACD / Labs The ACD / LogP module can be computed using the quantitative structure-property relationship (QSPR) methodology algorithm method using the 2D structure of the molecules.
- QSPR quantitative structure-property relationship
- the distribution coefficient (LogP value) of typical solvents at 25 ⁇ is as follows.
- DMAc N, N-Dimethylacetamide (N, N-dimethylacetamide)
- NMP N-methylpyrrolidone (N-methylpyrrolidone)
- NEP N-ethylpyrrolidone (N-ethylpyrrolidone)
- the second polyimide film may have an in-plane retardation value (Rin) of about 5 nm or less, preferably 0.05 to 5 nm, and maintain the above value even after the hot pressing process.
- Lin in-plane retardation value
- the second polyimide film may be formed on the first polyimide film to a thickness of 0.1 to 50 ⁇ , preferably 5 to 30 ⁇ .
- the second polyimide film can be easily peeled from the first polyimide film in the above-mentioned thickness range and utilized in the continuous manufacturing process of the substrate for a flexible device.
- the second polyimide film may have a yellowness index (YI) of 50 or less when the thickness is 50 ⁇ , 40 or less when the thickness is 40 ⁇ , 30 or less when the thickness is 30 ⁇ , 20 or less when the thickness is 20 ⁇ , And may be 10 or less when the thickness is 10 mu m.
- YI yellowness index
- a predetermined tensile force may be applied to the first polyimide film, but in the second polyimide film produced by the solution casting method on the first polyimide film, The difference in mechanical strength between the longitudinal direction (MD) and the transverse direction (TD) is small, so that no warping phenomenon occurs, so that the in-plane retardation value of the film can be small.
- the polyimide precursor solution is applied to a substrate and heat-treated on an IR oven, a hot air oven or a hot plate.
- the heat treatment temperature may range from 300 to 450 ° C, preferably from 320 to 400 ° C, May be carried out by a multi-stage heating process.
- the heat treatment process may be performed for 10 minutes to 70 minutes, preferably 10 minutes to 60 minutes.
- the polyimide constituting the first polyimide film according to the present invention may not exhibit a glass transition temperature (Tg) in the heat treatment temperature range, that is, the curing temperature range of the polyimide, Or more, more preferably 450 ⁇ ⁇ or higher.
- Tg glass transition temperature
- the method of manufacturing the polyimide laminated film roll may be a roll-to-roll process.
- a roll of a laminated film in which a polyimide substrate (first polyimide film) and a second polyimide film are combined in the manner shown in Fig. 3 can be produced.
- the first polyimide film used as the supporting substrate can also serve as a protective film of the second polyimide film, and thus, there is no need for a separate step of forming a protective film, and all the problems Can be solved.
- the present invention provides a method of manufacturing a polyimide laminated film, comprising the steps of: forming a device on a surface of a second polyimide film of a polyimide laminated film supplied from a roll of the polyimide laminated film produced by the above manufacturing method; And a step of peeling the first polyimide film after formation of the element.
- Examples of the device formed on the second polyimide film include light emitting devices such as organic electroluminescence (EL) devices and thin film transistor (TFT) devices, metal wiring, and modules such as semiconductor integrated circuits.
- EL organic electroluminescence
- TFT thin film transistor
- an organic EL element When an organic EL element, a light emitting element such as a TFT element, or the like is formed on a polyimide-based film, it can be used as a flexible display substrate or the like. Further, when a module such as a metal wiring or a semiconductor integrated circuit is formed, it can be used as a substrate for a flexible wiring.
- a gate electrode is provided by forming a film of a metal or a metal oxide by a sputtering method or the like and then etching.
- the temperature at which a film of a metal or a metal oxide is formed by a sputtering method or the like can be appropriately selected depending on the polyimide-based film-forming composition, support, or device to be used, More preferably 220 to 370 ° C, and more preferably 230 to 350 ° C.
- a gate insulating film such as a silicon nitride film is formed on a polyimide-based film provided with a gate electrode, for example, by the plasma CVD method. Further, an active layer including an organic semiconductor or the like is formed on the gate insulating film by a plasma CVD method or the like.
- the temperature at which a film such as a gate insulating film or an organic semiconductor is formed by a plasma CVD method or the like can be appropriately selected depending on the composition for forming a polyimide film to be used, the support and the device to be formed, More preferably 220 to 370 ° C, and more preferably 230 to 350 ° C.
- a source electrode and a drain electrode are formed by forming a film of a metal or a metal oxide on the active layer by a sputtering method or the like, and then etching. Finally, if necessary, a silicon nitride film or the like is formed by a plasma CVD method or the like, and a protective film is formed, whereby a thin film transistor element can be manufactured.
- the TFT element is not limited to this structure but may be a top gate type or the like.
- the gate electrode, the source electrode, and the drain electrode are not particularly limited as long as they are formed of a conductive material.
- the conductive material include metals and metal oxides.
- Examples of the metal include platinum, gold, silver, nickel, chromium, copper, iron, tin, antimony lead, tantalum, indium, aluminum, zinc, magnesium and alloys thereof.
- Examples of metal oxides include ITO, IZO, ZnO And In2O3.
- a conductive polymer may be used as the conductive material.
- a metal oxide is preferable because a transparent electrode can be formed.
- Examples of the method of forming the organic EL element include a method of forming the insulating layer, the first electrode, the organic semiconductor layer, the second electrode and the protective layer on the polyimide-based film in this order from the film surface side .
- a metal wiring can be provided by providing a copper layer on a polyimide-based film by, for example, a lamination method or a metalizing method, and treating the copper layer by a known method.
- a lamination method for example, a copper foil or the like may be hot-pressed on the film to form a copper layer.
- a seed layer containing a Ni-based metal binding to the polyimide-based film is formed by, for example, a vapor deposition method or a sputtering method.
- a copper layer having a predetermined thickness can be formed by a wet plating method or the like.
- the second polyimide film produced by the method according to the present invention is excellent in heat resistance and excellent in adhesion with a support, so that it is possible to obtain a substrate having a wide range of applicable temperatures for forming an element on a film, .
- the second polyimide film on which the element is formed may be laminated on the inorganic substrate, and then the first polyimide film may be peeled off.
- a second polyimide film is cut from a polyimide laminated film to a predetermined size and then peeled off from the first polyimide film used as a base material, A method of manufacturing a laminate body with an inorganic substrate through a process of forming an inorganic substrate.
- the second polyimide film surface of the polyimide laminated film is brought into contact with an inorganic substrate, followed by heating and pressing to laminate the polyimide laminated film on the inorganic substrate.
- a roll of a laminated film type is immediately inserted into a continuous process, followed by a heat pressing process, and then cut to a predetermined size to separate the first polyimide film from the second polyimide film adhered on the inorganic substrate Can be efficient.
- the PET film used as a conventional protective film is low in heat resistance, so that when it is used as it is in a hot pressing process, warpage of the substrate can be caused by deformation such as shrinkage and adhesion of the protective film to the polyimide film is increased. And it is possible to cause peeling at the interface between the inorganic substrate and the polyimide film.
- the polyimide film having high heat resistance is used as a protective film, the present invention may have little or no change in physical properties even in a hot pressing process at a high temperature.
- the degree of warpage of the laminate after the hot pressing step may be 30 ° or less with respect to the end of the substrate, and for example, the degree of warpage may be 0.1 to 15 °.
- the degree of bending in the present invention means the degree of an angle of climbing from both ends with respect to a horizontal line connecting both ends of the substrate. It is possible to provide a more uniform and flat laminate because bending hardly occurs.
- the step of cutting the polyimide laminated film may be performed by laser cutting or diamond scribing, but any method capable of cutting the film can be used without limitation.
- peel strength and adhesive strength according to the present invention can be measured under the conditions shown in Table 2 below.
- 'adhesive force' refers to the adhesive strength of the first polyimide film to the second polyimide film before the cutting process
- 'peel strength' refers to the adhesive strength of the first polyimide film to the second polyimide film .
- Peel strength measurement conditions Film width (mm) 10 Film length (mm) 100 Speed (mm / min) 50 Measuring instrument Texture Analyzer (TA.XT plus, Stable micro systems) Peeling angle 90
- the peel strength of the laminated film is obtained by preparing a polyimide laminated film laminate laminated on a first polyimide and a second polyimide laminated film sample or on a glass substrate, cutting the polyimide laminated film into a rectangular shape having a width of 10 mm And measuring the force applied when the end portion of the cut first polyimide film is pulled off from the second polyimide film at an angle of 90 degrees under the above-described measuring instrument and conditions.
- the adhesive strength before cutting was prepared by preparing a polyimide laminated film sample or a polyimide laminated film laminated on an organic substrate, attaching the end portion of the first polyimide film to the sample with a tape having a width of 10 mm,
- the measuring device and conditions of the force may be the same as those of the peeling strength measuring device and conditions shown in Table 2.
- the peeling strength of the second polyimide film have.
- the polyimide laminated film according to the present invention does not require a laser or light irradiation or dissolution step and does not use a release agent for facilitating peeling and is capable of forming a first polyimide film from the second polyimide film by a simple cutting process, The film can be easily peeled off.
- the hot pressing process may be performed at a nip pressure of 10 to 300 kN / m at a processing temperature of 400 ° C to 500 ° C, but is not limited thereto.
- the line pressure refers to the pressure per unit length of the roll in a lamination process, which is the pressure to which the roll is brought into contact with the substrate.
- the peel strength of the first polyimide film and the second polyimide film is the same as the peel strength before the heat- And may exhibit a peel strength of, for example, about 0.3 N / cm or less, for example, about 0.2 N / cm or less, or about 0.1 N / cm or less, or about 0.001 to 0.05 N / cm.
- the inorganic substrate may be a glass substrate, a metal substrate such as a stainless steel substrate, or a multilayer structure of two or more thereof.
- a glass substrate on which a device manufacturing process for a glass substrate can be most easily applied may be preferable.
- a composition comprising 20 wt% of a polyamic acid resin prepared by polymerizing 1 mol of BPDA and 0.99 mol of PDA as a first polyimide film and 80 wt% of DMAc as a solvent was cast on a support, followed by drying at 120 ⁇ And a curing process (for 30 minutes) at a temperature of 150 ° C - 230 ° C - 300 ° C - 480 ° C) to prepare a first polyimide film having a thickness of 600 mm for use as a carrier substrate having a thickness of 60 microns .
- composition for forming a second polyimide film which contained 10% by weight of a polyamic acid resin prepared by polymerizing 0.12 mol of 6FDA, 0.55 mol of PMDA and 0.66 mol of TFMB, and 90% by weight of DEAc as a solvent.
- the composition for forming the second polyimide film was dried to a thickness of 10 ⁇ (Cast), and a second polyimide film was formed on the first polyimide film by successively performing a drying step at 100 ° C and a curing step at 400 ° C for 30 minutes.
- the first and second polyimide film laminate were wound at a winding speed of 0.1 m / min to obtain a polyimide film laminated roll.
- the second polyimide film side of the polyimide laminated film prepared in Example 1 was brought into contact with a glass substrate having a size of (370 x 470 mm), and then heated and pressed at a temperature of 350 ° C at a pressure of 75 KN / m to form a polyimide laminated film, Lt; / RTI >
- the polyimide laminated film of the laminate was cut so that the first polyimide film could not be cut, and the second polyimide film was peeled from the first polyimide film to obtain a laminate in which the second polyimide film was laminated on the glass substrate.
- a laminate of a laminated roll and an inorganic substrate was produced in the same manner as in Examples 1 and 2 except that PMDA-ODA was used as the first polyimide film.
- the physical properties of the film and the laminate are measured as follows.
- the mechanical properties (modulus, peak stress, and maximum elongation) of the films were measured using Instron UTM. Specifically, the film was cut to 5 mm.times.60 mm or more, and the gap between the grips was set at 40 mm, and the tensile strength and other mechanical properties were examined at 20 mm / min. (KS M ISO 527).
- the retardation in thickness direction (Rth) and the retardation in film direction (Ro) of the film were measured by Axoscan.
- CTE coefficient of thermal expansion
- Tg glass transition temperature
- the coefficient of thermal expansion (CTE) and dimensional change of the film were measured using Q400 of TA.
- a 15-micron thick film was prepared in a size of 5 mm x 20 mm, and the sample was loaded using an accessory.
- the actual measured film length was equal to 16 mm.
- the film pulling force was set at 0.02 N, the measurement starting temperature was 30 ° C at a rate of 5 ° C / min to 300 ° C, cooled again to -5 ° C / min to 80 ° C,
- the coefficient of linear thermal expansion in the MD and TD directions of the polyimide film was measured as an average value in the range of 100 to 400 ° C.
- the inflection point of the curve was defined as Tg by observing the slope that changed before and after the glass transition temperature.
- HLC-8020 type GPC apparatus manufactured by TOSOH.
- solvent N-methyl-2-pyrrolidone (NMP) containing lithium bromide and phosphoric acid was used, and the molecular weight in terms of polystyrene was determined at a measurement temperature of 40 ° C.
- the polyimide-based film peeled off from the support was cut to a size of 40 x 40 mm and warped (a polyimide-based film obtained on a horizontal substrate was placed and the separation distance between the film and the substrate at the four corners of the film was measured, A case where the warp is less than 2.0 mm and a case where the warp is not less than 3.0 mm is indicated by X, a case where the warp is less than 1.0 mm is indicated by [ Respectively.
- a layered product of a laminated roll and an inorganic substrate was prepared in the same manner as in Examples 1 and 2 except that 0.27 mol of 6FDA and 0.26 mol of TFMB were used as the first polyimide film.
- FIG. 5 is a SEM image of the cross section of the second polyimide film. According to Fig. 5, it is understood that the pores have a pore size of 100 nm or less and the shape of the pores is spherical with an average diameter of 10 to 50 nm.
- Example 5 Production of second polyimide film using amine-based polyamic acid
- Example 2 The same procedure as in Example 1 was repeated except that a composition for forming a second polyimide film containing 10 wt% of a polyamic acid resin prepared by polymerizing 0.067 mol of PMDA-HS and 0.067 mol of DABA and 90 wt% of DEAc as a solvent was used A laminated body with a laminated roll and an inorganic substrate was prepared.
- a composition for forming a second polyimide film containing 10 wt% of a polyamic acid resin prepared by polymerizing 0.136 mol of BPDA and 0.134 mol of PDA and 90 wt% of DEAc as a solvent was used in the same manner as in Example 1 Laminated rolls and an inorganic substrate were prepared.
- the first polyimide film Mw 1% pyrolysis temperature ( ⁇ ) Modulus (GPa) Tensile Strength (MPa) Yield Strength (MPa) CTE (100-500 ⁇ ⁇ ) (ppm / ⁇ ⁇ ) Example 1 125,000 580 11 562 190 3 Comparative Example 1 98,000 501 4.0 160 90 160
- the first polyimide film used in the production of the roll according to the Examples has excellent physical properties such as 1% thermal decomposition temperature, modulus, tensile strength, yield strength and thermal expansion coefficient.
- Table 4 shows the results of measurement of the glass transition temperature, retardation in the plane direction, residual stress of the first polyimide film and the second polyimide film laminate of the second polyimide film prepared in Examples and Comparative Examples.
- Example 1 10 112,000 N.D. - 8 7 0.15 6.5 1.5 °
- Example 4 10 105,000 405 10 to 15 58 57 0.21 5.3 2.3 °
- Example 5 10 89,500 420 - 49 48 0.87 9.5 10.2 DEG Comparative Example 2 10 125,000 No film peeling is possible and measurement is impossible
- the laminated films according to Comparative Examples 1 and 2 were not suitable for the continuous process due to the occurrence of curling due to a high residual stress after winding or film peeling.
- the film according to the embodiment shows a 10 ⁇ thick film having a yellowness degree of 10 or less, little difference in CTE in the MD and TD directions, a low residual stress, and a low warpage.
- the laminated rolls were manufactured while varying the thicknesses of the first polyimide film and the second polyimide film with respect to the rolls prepared by the method according to Example 1, and the peel strengths were measured.
- the measurement method is as described in Table 2.
- the second polyimide film thickness (mu m) The first polyimide film thickness (mu m) 60 90 120 150 200 250 5 0.1 N / cm 0.05 N / cm 0.05 N / cm 0.05 N / cm 0.05 N / cm 0.05 N / cm 10 0.05 N / cm 0.05 N / cm 0.05 N / cm 0.05 N / cm 0.05 N / cm 0.05 N / cm 15 0.03 N / cm 0.02 N / cm 0.02 N / cm 0.05 N / cm 0.02 N / cm 20 0.03 N / cm 0.02 N / cm 0.02 N / cm 0.05 N / cm 0.02 N / cm 30 0.03 N / cm 0.02 N / cm 0.02 N / cm 0.05 N / cm 0.02 N / cm 35 0.02 N / cm 0.02 N / cm 0.02 N / cm 0.02 N / cm 0.01 N / cm 0.01 N / cm 40
- the present invention it is possible to manufacture a polyimide laminated film in which a polyimide film formed by using a solution casting process with a high heat-resistant polyimide film is superimposed, and the laminated film is wound thereon without peeling, It is possible to continuously produce a laminate in which a polyimide film is laminated on a glass substrate by using a hot pressing method, thereby improving the yield and efficiency of the process. While the present invention has been particularly shown and described with reference to specific embodiments thereof, those skilled in the art will appreciate that such specific embodiments are merely preferred embodiments and that the scope of the present invention is not limited thereby. something to do. It is therefore intended that the scope of the invention be defined by the claims appended hereto and their equivalents.
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Abstract
Description
DEF | DMF | DEAc | DAMc | NMP | NEP | DMPA | DEPA | |
LogP (25℃) | 0.05 | -1.01 | 0.32 | -0.75 | -0.28 | 0.22 | 0.25 | 1.28 |
박리강도측정조건 | 필름 폭(mm) | 10 |
필름 길이(mm) | 100 | |
속도(mm/min) | 50 | |
측정 기기 | Texture Analyser(TA.XT plus, Stable micro systems사제) | |
박리각도 | 90 |
제1폴리이미드필름 | Mw | 1% 열분해 온도(℃) | 모듈러스(GPa) | 인장강도(MPa) | 항복강점(MPa) | CTE(100-500℃)(ppm/℃) |
실시예1 | 125,000 | 580 | 11 | 562 | 190 | 3 |
비교예1 | 98,000 | 501 | 4.0 | 160 | 90 | 160 |
제2폴리이미드필름 | 두께 (㎛) | Mw | 유리전이온도(℃) | 공극크기(nm) | MD 방향 CTE(100-500℃)(ppm/℃) | TD 방향CTE(100-500℃)(ppm/℃) | 적층체잔류응력(MPa) | YI | 휘어짐 정도 |
실시예1 | 10 | 112,000 | N.D. | - | 8 | 7 | 0.15 | 6.5 | 1.5° |
실시예4 | 10 | 105,000 | 405 | 10~15 | 58 | 57 | 0.21 | 5.3 | 2.3° |
실시예5 | 10 | 89,500 | 420 | - | 49 | 48 | 0.87 | 9.5 | 10.2° |
비교예2 | 10 | 125,000 | 필름 박리가 불가능 하여 측정불가 |
제2폴리이미드 필름 두께(㎛) | 제1폴리이미드 필름 두께 (㎛) | |||||
60 | 90 | 120 | 150 | 200 | 250 | |
5 | 0.1N/cm | 0.05N/cm | 0.05N/cm | 0.05N/cm | 0.05N/cm | 0.05N/cm |
10 | 0.05N/cm | 0.05N/cm | 0.05N/cm | 0.05N/cm | 0.05N/cm | 0.05N/cm |
15 | 0.03N/cm | 0.02N/cm | 0.02N/cm | 0.05N/cm | 0.02N/cm | 0.02N/cm |
20 | 0.03N/cm | 0.02N/cm | 0.02N/cm | 0.05N/cm | 0.02N/cm | 0.02N/cm |
30 | 0.03N/cm | 0.02N/cm | 0.02N/cm | 0.05N/cm | 0.02N/cm | 0.02N/cm |
35 | 0.02N/cm | 0.02N/cm | 0.02N/cm | 0.02N/cm | 0.01N/cm | 0.01N/cm |
40 | 0.02N/cm | 0.01N/cm | 0.02N/cm | 0.02N/cm | 0.01N/cm | 0.01N/cm |
45 | 0.02N/cm | 0.01N/cm | 0.02N/cm | 0.02N/cm | 0.01N/cm | 0.01N/cm |
50 | 0.02N/cm | 0.01N/cm | 0.02N/cm | 0.02N/cm | 0.01N/cm | 0.01N/cm |
Claims (20)
- 제1 폴리이미드 필름 및제1폴리이미드 필름 상에 적층되어 있으며, 불소계, 실록산계 또는 아민계 폴리아믹산으로 제조된 제2폴리이미드 필름을 포함하는 적층 필름이 권취되어 있는 롤체로서,제2폴리이미드 필름이 승온속도 20℃/min로 측정한 유리전이온도가 350℃ 이상인 것인 적층필름 롤체.
- 제1항에 있어서,상기 제1폴리이미드 필름의 두께가 60 내지 500㎛ 이고, 제2폴리이미드 필름의 두께가 0.1 내지 50㎛인 적층필름 롤체.
- 제1항에 있어서,상기 제1폴리이미드 필름의 열분해 온도가 450℃ 이상, 모듈러스가 9 내지 11GPa, 인장강도는 400 내지 600MPa이며, 항복강점이 130 내지 200MPa 이고, 열창창계수(CTE)가 100 내지 500℃ 온도 범위에서 -20ppm/℃ 내지 20ppm/℃인 적층필름 롤체.
- 제1항에 있어서,잔류응력이 0.1MPa 내지 200MPa인 적층필름 롤체.
- 제1항에 있어서,상기 제2 폴리이미드 필름이 불소계 폴리아믹산으로부터 제조된 경우 산이무수물로서 4,4'-(헥사플루오로이소프로필리덴)디프탈산 무수물과 피로멜리트산 이무수물, 디아민으로서 2,2'-비스(트리플루오로메틸)벤지딘을 중합성분으로 하여 제조된 것인 적층필름 롤체.
- 제1항에 있어서,제2폴리이미드 필름이 실록산계 폴리아믹산으로부터 제조된 경우, (A) 테트라카르복실산 이무수물 및 그의 반응성 유도체로 이루어지는 군으로부터 선택되는 적어도 1종의 아실 화합물을 포함하는 성분과, (B) 이미노 형성 화합물을 포함하는 성분을 반응시켜 얻어지며, 하기 (i) 및/또는 (ii)를 만족시키는 것인 적층필름 롤체:(i) 상기 (A) 성분이, (A-1) 화학식 7로 표시되는 구조 단위를 갖는 아실 화합물을 포함함(ii) 상기 (B) 성분이, (B-1) 화학식 7로 표시되는 구조 단위를 갖는 이미노 형성 화합물을 포함함[화학식 7]
- 제7항에 있어서,상기 제2폴리이미드 필름 제조용 폴리아믹산은 하기 식 1에 의해 산출되는 실리콘 화합물 농도가 3 내지 50 중량%인 것인 적층필름 롤체:[식 1]실리콘 화합물 농도(중량%) = [화학식 7로 표시되는 구조단위를 갖는 화합물의 전체 중량/(아실화합물의 전체 중량+이미노 화합물의 전체 중량)]x 100.
- 제7항에 있어서,상기 (B) 성분에서의 상기 (B-1) 상기 화학식 7로 표시되는 구조 단위를 갖는 이미노 형성 화합물의 함유량이, 상기 (B) 성분의 합계량 100 중량%에 대하여 5 내지 70 중량%인 적층필름 롤체.
- 제7항에 있어서,상기 (B) 성분에서의 상기 (B-1) 상기 화학식 7로 표시되는 구조 단위를 갖는 이미노 형성 화합물의 아민가로부터 계산한 수평균 분자량이 500 내지 10,000인 적층필름 롤체.
- 제7항에 있어서,상기 폴리아믹산이 상기 (A) 성분과 상기 (B) 성분을, (A) 성분과 (B) 성분의 몰비((B) 성분/(A) 성분) 0.8 내지 1.2의 범위에서 반응시켜 얻어지는 것인 적층필름 롤체.
- 제1항에 있어서,제2폴리이미드 필름이 아민계 폴리아믹산으로부터 제조된 경우 산이수무물로서 N,N'-비스(1,2-시클로헥산디카르복실산 무수물-4-일)카르보닐-3,3'-디아미노디페닐술폰(PSHT), N,N'-비스(1,2-시클로헥산디카르복실산 무수물-4-일)카르보닐-1,4-페닐렌디아민(PPHT), N,N'-1,4-페닐렌 비스[1,3-디하이드로-1,3-디옥소-5-이소벤조퓨란 카복사마이드] (N,N'-1,4-Phenylenebis[1,3-dihydro-1,3-dioxo-5-isobenzofurancarboxamide], PPTA), N,N'-1,3-페닐렌 비스[1,3-디하이드로-1,3-디옥소-5-이소벤조퓨란 카복사마이드] (N,N'-1,3-Phenylenebis[1,3-dihydro-1,3-dioxo-5-isobenzofurancarboxamide], MPTA), 3,3',4,4'-비페닐테트라카르복실산 이무수물 (BPDA), 피로멜리트산 이무수물(PMDA), 4,4'-(헥사플루오로이소프로필리덴)디프탈산 무수물(6FDA) 및 4,4'-(플루오레닐)디프탈산 무수물 (BPAF)로부터 선택되는 1종 이상과, 디아민으로서 N-(4-아미노페닐)-4-아미노벤즈아마이드 (N-(4-Aminophenyl)-4-aminobenzamide, DABA), N,N-비스(4-아미노페닐)-테레프탈아마이드(N,N-Bis(4-Aminophenyl)-terepthalamide, DATA), 4,4-비스(4-아미노벤즈아미도)-3,3-트리플루오로메틸비페닐(4,4-Bis(4-aminobenzamido)-3,3-trifuluoromethylbiphenyl, CF3DATA), 2,2'-비스(트리플루오로메틸)벤지딘 (TFMB), 4,4-디아미노디페닐술폰(4,4-DDS) 및 3,4-디아미노디페닐술폰(3,4-DDS)로부터 선택되는 1종 이상을 중합성분으로 하여 제조된 것인 적층필름 롤체.
- 제1항에 있어서,상기 제2폴리이미드 필름은 필름 단면을 관찰하였을 때 직경 100nm 이하의 공극을 가지며, 공극의 형상은 평균직경 10 ~ 50 nm의 구형인 것인 적층필름 롤체.
- 제1항에 있어서,상기 제2폴리이미드 필름의 면방향 위상차가 5 nm 이하인 적층필름 롤체.
- 제1항에 있어서,상기 제2폴리이미드 필름은 두께 50㎛일 때 황색도(YI)가 50 이하인 것인 적층필름 롤체.
- 제1폴리이미드 필름의 권취롤로부터 제1폴리이미드 필름을 권출하는 단계;권출된 제1폴리이이미드 필름 상에 불소계, 실록산계 또는 아민계 폴리아믹산 용액을 코팅하는 단계;상기 코팅된 폴리아믹산 용액을 가열 및 경화하여 제1폴리이미드 필름 상에 제2폴리이미드 필름을 형성하는 단계; 및상기 제1폴리이미드 필름과 제2폴리이미드 필름을 분리하지 않고 함께 권취하여 적층 필름 롤체를 얻는 단계를 포함하며,상기 제1폴리이미드 필름은 별도의 지지기재에 의해 지지되지 않은 자기-지지성(self-supporting) 인,제1항 내지 제15항 중 어느 한 항의 적층필름 롤(roll)체의 제조방법.
- 제16항에 있어서,상기 제1폴리이미드 필름에는 0.1 내지 200 MPa의 장력이 가해지는 적층필름 롤체의 제조 방법.
- 제16항에 있어서,상기 폴리아믹산 용액은 25 ℃에서 측정한 분배계수(LogP) 양수인 용매를 유기용매 충중량을 기준으로 50중량% 이상 포함하는 것인 적층필름 롤체의 제조방법.
- 제16항에 있어서,상기 코팅된 폴리아믹산 용액의 가열 및 경화는 질소분위기 250 내지 450℃의 범위에서, 제2폴리이미드 필름의 유리전이온도 이하에서 진행하는 것인 적층 필름 롤체의 제조방법.
- 제1항 내지 제15항 중 어느 한 항에 따른 적층필름 롤체를 권출하여 공급된 폴리이미드 적층필름의 제2폴리이미드 필름면에 소자를 형성하는 단계; 및상기 소자 형성 후 제1폴리이미드 필름을 박리하는 단계를 포함하는 플렉서블 디바이스 제조방법.
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