CN118056861A - Resin film, endless belt, and image forming apparatus - Google Patents
Resin film, endless belt, and image forming apparatus Download PDFInfo
- Publication number
- CN118056861A CN118056861A CN202311543729.9A CN202311543729A CN118056861A CN 118056861 A CN118056861 A CN 118056861A CN 202311543729 A CN202311543729 A CN 202311543729A CN 118056861 A CN118056861 A CN 118056861A
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- Prior art keywords
- solvent
- resin film
- group
- amide
- belt
- Prior art date
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- 229920005989 resin Polymers 0.000 title claims abstract description 233
- 239000002904 solvent Substances 0.000 claims abstract description 236
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- 125000004185 ester group Chemical group 0.000 claims abstract description 56
- 125000003545 alkoxy group Chemical group 0.000 claims abstract description 55
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000004202 carbamide Substances 0.000 claims abstract description 44
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- 238000012546 transfer Methods 0.000 claims description 115
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- HLBLWEWZXPIGSM-UHFFFAOYSA-N 4-Aminophenyl ether Chemical compound C1=CC(N)=CC=C1OC1=CC=C(N)C=C1 HLBLWEWZXPIGSM-UHFFFAOYSA-N 0.000 claims description 28
- 238000012360 testing method Methods 0.000 claims description 27
- GEYOCULIXLDCMW-UHFFFAOYSA-N 1,2-phenylenediamine Chemical compound NC1=CC=CC=C1N GEYOCULIXLDCMW-UHFFFAOYSA-N 0.000 claims description 21
- 238000009835 boiling Methods 0.000 claims description 13
- LBVMWHCOFMFPEG-UHFFFAOYSA-N 3-methoxy-n,n-dimethylpropanamide Chemical compound COCCC(=O)N(C)C LBVMWHCOFMFPEG-UHFFFAOYSA-N 0.000 claims description 10
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- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 125000001951 carbamoylamino group Chemical group C(N)(=O)N* 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- VKIRRGRTJUUZHS-UHFFFAOYSA-N cyclohexane-1,4-diamine Chemical compound NC1CCC(N)CC1 VKIRRGRTJUUZHS-UHFFFAOYSA-N 0.000 description 1
- WOSVXXBNNCUXMT-UHFFFAOYSA-N cyclopentane-1,2,3,4-tetracarboxylic acid Chemical compound OC(=O)C1CC(C(O)=O)C(C(O)=O)C1C(O)=O WOSVXXBNNCUXMT-UHFFFAOYSA-N 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012024 dehydrating agents Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 125000004427 diamine group Chemical group 0.000 description 1
- LTYMSROWYAPPGB-UHFFFAOYSA-N diphenyl sulfide Chemical compound C=1C=CC=CC=1SC1=CC=CC=C1 LTYMSROWYAPPGB-UHFFFAOYSA-N 0.000 description 1
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 239000003480 eluent Substances 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 125000003754 ethoxycarbonyl group Chemical group C(=O)(OCC)* 0.000 description 1
- 125000004672 ethylcarbonyl group Chemical group [H]C([H])([H])C([H])([H])C(*)=O 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- ANSXAPJVJOKRDJ-UHFFFAOYSA-N furo[3,4-f][2]benzofuran-1,3,5,7-tetrone Chemical compound C1=C2C(=O)OC(=O)C2=CC2=C1C(=O)OC2=O ANSXAPJVJOKRDJ-UHFFFAOYSA-N 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- YAMHXTCMCPHKLN-UHFFFAOYSA-N imidazolidin-2-one Chemical compound O=C1NCCN1 YAMHXTCMCPHKLN-UHFFFAOYSA-N 0.000 description 1
- 125000005462 imide group Chemical group 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 125000000686 lactone group Chemical group 0.000 description 1
- 125000005647 linker group Chemical group 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 125000001160 methoxycarbonyl group Chemical group [H]C([H])([H])OC(*)=O 0.000 description 1
- 125000004674 methylcarbonyl group Chemical group CC(=O)* 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 125000006252 n-propylcarbonyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C(*)=O 0.000 description 1
- KQSABULTKYLFEV-UHFFFAOYSA-N naphthalene-1,5-diamine Chemical compound C1=CC=C2C(N)=CC=CC2=C1N KQSABULTKYLFEV-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- SXJVFQLYZSNZBT-UHFFFAOYSA-N nonane-1,9-diamine Chemical compound NCCCCCCCCCN SXJVFQLYZSNZBT-UHFFFAOYSA-N 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- WKGDNXBDNLZSKC-UHFFFAOYSA-N oxido(phenyl)phosphanium Chemical compound O=[PH2]c1ccccc1 WKGDNXBDNLZSKC-UHFFFAOYSA-N 0.000 description 1
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 1
- UFOIOXZLTXNHQH-UHFFFAOYSA-N oxolane-2,3,4,5-tetracarboxylic acid Chemical compound OC(=O)C1OC(C(O)=O)C(C(O)=O)C1C(O)=O UFOIOXZLTXNHQH-UHFFFAOYSA-N 0.000 description 1
- 238000001139 pH measurement Methods 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920005575 poly(amic acid) Polymers 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- SKXUZVAWHSXDRT-UHFFFAOYSA-N prop-1-enylurea Chemical compound CC=CNC(N)=O SKXUZVAWHSXDRT-UHFFFAOYSA-N 0.000 description 1
- 125000004151 quinonyl group Chemical group 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000006798 ring closing metathesis reaction Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 150000003458 sulfonic acid derivatives Chemical class 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
- G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
- G03G15/1605—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support
- G03G15/162—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support details of the the intermediate support, e.g. chemical composition
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1003—Preparatory processes
- C08G73/1007—Preparatory processes from tetracarboxylic acids or derivatives and diamines
- C08G73/1028—Preparatory processes from tetracarboxylic acids or derivatives and diamines characterised by the process itself, e.g. steps, continuous
- C08G73/1032—Preparatory processes from tetracarboxylic acids or derivatives and diamines characterised by the process itself, e.g. steps, continuous characterised by the solvent(s) used
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1042—Copolyimides derived from at least two different tetracarboxylic compounds or two different diamino compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1067—Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1067—Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound
- C08G73/1071—Wholly aromatic polyimides containing oxygen in the form of ether bonds in the main chain
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
- G03G15/2053—Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating
- G03G15/2057—Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating relating to the chemical composition of the heat element and layers thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2379/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2361/00 - C08J2377/00
- C08J2379/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08J2379/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
A resin film, an endless belt, and an image forming apparatus, wherein the resin film has a resin layer containing at least one solvent selected from the group consisting of urea-based solvents, amide-based solvents containing an alkoxy group, and amide-based solvents containing an ester group, and wherein the content of the solvent is more than 2200ppm and 10000ppm or less relative to the total amount of the resin layer.
Description
Technical Field
The present invention relates to a resin film, an endless belt, and an image forming apparatus.
Background
Patent document 1 proposes "an endless belt having a polyimide resin layer containing at least one solvent selected from the group consisting of urea solvents, amide solvents containing an alkoxy group, and amide solvents containing an ester group in an amount of 50ppm to 2000 ppm. ".
Patent document 2 proposes "a cyclic tape comprising a polyimide resin containing at least one component selected from the group consisting of two or more components derived from tetracarboxylic dianhydride and components derived from a diamine compound, and having a polyimide resin layer containing at least one solvent selected from the group consisting of a urea solvent, an amide solvent containing an alkoxy group, and an amide solvent containing an ester group in an amount of 50ppm to 2000 ppm. ".
Patent document 3 proposes an intermediate transfer belt that is attached to an image forming apparatus including an image bearing member, a developing mechanism that develops a latent image formed on the image bearing member with toner, an intermediate transfer belt that primarily transfers a toner image developed by the developing mechanism, and a transfer mechanism that secondarily transfers the toner image carried on the intermediate transfer belt to a recording medium, wherein the intermediate transfer belt is a polyimide resin or a polyamide-imide resin that contains only 5ppm to 5000ppm of γ -butyrolactone as a residual solvent. ".
Patent document 1: japanese patent laid-open No. 2017-223837
Patent document 2: japanese patent laid-open publication No. 2019-045677
Patent document 3: japanese patent laid-open publication No. 2014-170048
Disclosure of Invention
An object of embodiment 1 of the present invention is to provide a resin film which can suppress occurrence of cracking in a bent portion even in the case of repeated bending, as compared with the case where the content of the solvent is 2200ppm or less or more than 10000ppm relative to the total amount of the resin layer in the resin film having the resin layer containing at least one solvent selected from the group consisting of a urea-based solvent, an amide-based solvent containing an alkoxy group, and an amide-based solvent containing an ester group.
The object of embodiment 2 of the present invention is to provide a resin film which can suppress occurrence of cracking in a bent portion even in the case of repeated bending, as compared with the case where the tensile breaking strength is less than 270N/mm 2 in a resin film having a resin layer containing at least one solvent selected from the group consisting of a urea-based solvent, an amide-based solvent containing an alkoxy group, and an amide-based solvent containing an ester group.
The means for solving the above problems include the following means.
< 1 > A resin film having a resin layer containing at least one solvent selected from the group consisting of urea-based solvents, amide-based solvents containing an alkoxy group, and amide-based solvents containing an ester group, wherein,
The content of the solvent is more than 2200ppm and 10000ppm or less relative to the total amount of the resin layer.
< 2 > The resin film according to < 1 >, wherein,
The solvent is at least one selected from the group consisting of amide solvents containing an alkoxy group and amide solvents containing an ester group.
The resin film according to < 3 > to < 2 >, wherein,
The amide solvent containing alkoxy is at least one selected from the group consisting of 3-methoxy-N, N-dimethylpropionamide and 3-N-butoxy-N, N-dimethylpropionamide,
The amide solvent containing the ester group is 5-dimethylamino-2-methyl-5-oxo-methyl valerate.
A resin film according to any one of < 1 > to < 3 > wherein,
The solvent is 3-methoxy-N, N-dimethyl propionamide.
A resin film according to any one of < 1 > to < 4 > wherein,
The resin layer comprises a polyimide resin having structural units derived from phenylenediamine and structural units derived from diaminodiphenyl ether,
In the polyimide resin, the content ratio of the structural unit derived from the phenylenediamine to the structural unit derived from the diaminodiphenyl ether (structural unit derived from the phenylenediamine/structural unit derived from the diaminodiphenyl ether) is 80/20 or more and 99.7/0.3 or less in terms of a molar ratio.
A resin film according to any one of < 1 > to < 5 > wherein,
The content of the solvent is 2500ppm to 9000ppm relative to the total amount of the resin layer.
The resin film according to < 7 > to < 6 >, wherein,
The content of the solvent is 6000ppm to 7000ppm relative to the total amount of the resin layer.
A resin film according to any one of < 1 > to < 7 > wherein,
The boiling point of the solvent is more than 200 ℃ and less than 280 ℃.
A resin film according to any one of < 1 > to < 8 >, wherein,
The number of folding-back times based on MIT test using a jig with a radius of curvature R of 2mm was 300,000 or more.
< 10 > A resin film having a resin layer containing at least one solvent selected from the group consisting of urea-based solvents, amide-based solvents containing an alkoxy group, and amide-based solvents containing an ester group, wherein,
The tensile breaking strength is 270N/mm 2 or more.
< 11 > An endless belt formed of the resin film described in any one of < 1 > to < 10 >.
< 12 > An image forming apparatus having the endless belt described as < 11 >.
< 13 > An image forming apparatus, comprising:
An image holding body;
A charging device for charging the surface of the image holder;
a static charge image forming device for forming a static charge image on the surface of the charged image holder;
A developing device for developing an electrostatic charge image formed on a surface of the image holding body as a toner image by a developer containing a toner;
a transfer device that transfers the toner image to a recording medium; and
A fixing device for fixing the toner image to the recording medium,
At least one selected from the group consisting of the transfer device and the fixing device has the endless belt < 11 >.
Effects of the invention
According to the invention of < 1 >, there is provided a resin film which can suppress occurrence of cracking in a bent portion even in the case of repeated bending, as compared with the case where the content of the solvent is 2200ppm or less or more than 10000ppm relative to the total amount of the resin layer in the resin film having the resin layer containing at least one solvent selected from the group consisting of a urea-based solvent, an amide-based solvent containing an alkoxy group, and an amide-based solvent containing an ester group.
According to the invention of < 2 >, < 3 > or < 4 >, a resin film is provided which can suppress occurrence of cracks in the bent portion even in the case of repeated bending, as compared with the case where the solvent is a urea-based solvent.
According to the invention of < 5 >, there is provided a resin film which can suppress occurrence of cracking in a bent portion even in the case of repeated bending, compared with the case where the content ratio of a structural unit derived from phenylenediamine and a structural unit derived from diaminodiphenyl ether (a structural unit derived from phenylenediamine/a structural unit derived from diaminodiphenyl ether) in a polyimide resin is less than 80/20 and more than 99.7/0.3 in terms of a molar ratio.
According to the invention of < 6 > there is provided a resin film which can suppress occurrence of cracking in a bent portion even in the case of repeated bending, as compared with the case where the content of the solvent is less than 2500ppm or exceeds 9000 ppm.
According to the invention of < 7 > there is provided a resin film which can suppress occurrence of cracking in a bent portion even in the case of repeated bending, as compared with the case where the content of the solvent is less than 6000ppm or exceeds 7000 ppm.
According to the invention of < 8 >, there is provided a resin film which can suppress occurrence of cracking in a bent portion even in the case of repeated bending, as compared with the case where the boiling point of a solvent is less than 200 ℃ or exceeds 280 ℃.
According to the invention of < 9 > there is provided a resin film which can suppress occurrence of cracks in a bent portion even in the case of repeated bending, as compared with the case where the number of times of bending is less than 300,000 times based on the MIT test using a jig having a radius of curvature R of 2 mm.
According to the invention of < 10 > there is provided a resin film which can suppress occurrence of cracking in a bent portion even in the case of repeated bending, as compared with the case where the tensile breaking strength is less than 270N/mm 2 in a resin film having a resin layer containing at least one solvent selected from the group consisting of a urea-based solvent, an amide-based solvent containing an alkoxy group and an amide-based solvent containing an ester group.
According to the invention related to < 11 >,
Provided is a cyclic belt which can suppress occurrence of cracking in a bent portion even in the case of repeated bending, as compared with the case of a cyclic belt formed of a resin film having a solvent content of 2200ppm or less or more than 10000ppm relative to the total amount of the resin layer or the case of a cyclic belt formed of a resin film having a tensile breaking strength of less than 270N/mm 2 in a resin film having a resin layer containing at least one solvent selected from the group consisting of a urea-based solvent, an amide-based solvent containing an alkoxy group and an amide-based solvent containing an ester group.
According to the invention of < 12 > or < 13 >, there is provided an image forming apparatus comprising an endless belt which is formed of a resin film having a solvent content of 2200ppm or less or more than 10000ppm relative to the total amount of the resin layer or an endless belt formed of a resin film having a tensile breaking strength of less than 270N/mm 2, in comparison with a case of a resin film having a resin layer containing at least one solvent selected from the group consisting of a urea-based solvent, an amide-based solvent having an alkoxy group and an amide-based solvent having an ester group, and which is capable of suppressing occurrence of breakage in a bent portion even in the case of repeated bending.
Drawings
Embodiments of the present invention will be described in detail with reference to the following drawings.
Fig. 1 is a schematic configuration diagram showing an example of an image forming apparatus according to the present embodiment;
Fig. 2 is a schematic configuration diagram showing another example of the image forming apparatus according to the present embodiment;
fig. 3 is a schematic configuration diagram showing an example of the fixing device according to embodiment 1;
fig. 4 is a schematic configuration diagram showing an example of the fixing device according to embodiment 2;
fig. 5 is a schematic perspective view showing an example of the endless belt unit according to the present embodiment.
Symbol description
60-Fixing device, 61-heat roller, 62-pressure belt, 63-belt stroke guide, 64-press pad, 64 a-front nip member, 64 b-peeling nip member, 65-holding member, 66-halogen lamp, 68-slide member, 69-temperature sensitive element, 70-peeling member, 71-peeling claw, 72-holding member, 80-fixing device, 82-slide member, 84-heat belt, 86-fixing belt module, 88-pressure roller, 89A-halogen heater, 89-heating press roller, 90A-halogen heater, 90-backup roller, 92A-halogen heater, 92-backup roller, 94-posture correcting roller, 96-backup roller, 98-backup roller, 100-image forming device, 101a to 101 d-image holder, 102A to 102 d-charging devices (charging mechanisms), 103a and 103d, 204Y, 204M, 204C, 204 BK-developing devices (developing mechanisms), 104a to 104 d-image holder cleaning devices, 105a to 105 d-primary transfer rollers, 106a to 106 e-backup rollers, 107-intermediate transfer belts, 107b, 130, 220-endless belt units, 108-counter rollers, 109-secondary transfer rollers, 110, 209-fixing devices (fixing mechanisms), 111-driving rollers, 112, 113-intermediate transfer belt cleaning devices, 114a to 114 d-exposure devices (latent image forming mechanisms) 115-recording media, 116-secondary transfer belts, 201Y, 201M, 201C, 201 BK-photosensitive drums (image holders), 202Y, 202M, 202C, 202 BK-chargers (charging mechanisms), 203Y, 203M, 203C, 203 BK-exposer (latent image forming mechanism), 205Y, 205M, 205C, 205 BK-photosensitive drum cleaning member, 206-paper conveyor belt, 207Y, 207M, 207C, 207 BK-transfer rollers (transfer mechanisms), 214-belt cleaning member, 216-paper (recording medium).
Detailed Description
An embodiment, which is an example of the present invention, will be described below. The description and examples are illustrative of the embodiments and are not intended to limit the scope of the invention.
In the numerical ranges described in the present specification in stages, the upper limit value or the lower limit value described in one numerical range may be replaced with the upper limit value or the lower limit value of the numerical range described in other stages. In addition, in the numerical ranges described in the present specification, the upper limit value or the lower limit value of the numerical range may be replaced with the value shown in the embodiment.
Each component may comprise a plurality of corresponding substances.
When the amounts of the respective components in the composition are mentioned, if a plurality of substances corresponding to the respective components are present in the composition, the total amount of the plurality of substances present in the composition is represented unless otherwise specified.
< Resin film >)
The resin film according to embodiment 1 has a resin layer containing at least one solvent selected from the group consisting of urea solvents, amide solvents containing an alkoxy group, and amide solvents containing an ester group, and the content of the solvent is more than 2200ppm and 10000ppm or less relative to the total amount of the resin layer.
According to the above configuration, the resin film according to embodiment 1 can suppress occurrence of cracking in the bent portion even in the case of repeated bending. The reason for this is presumed as follows.
A resin film having a resin layer is sometimes used in a curved state. If repeated bending deformation is applied to the bending portion, a fracture may occur in the bending portion due to fatigue.
The resin film according to embodiment 1 has a solvent content of more than 2200ppm and 10000ppm or less relative to the total resin layer. The content of the solvent is set to more than 2200ppm with respect to the total amount of the resin layer, whereby the flexibility of the resin film is improved, and even when repeated bending deformation is received in the bending portion, breakage in the bending portion can be suppressed.
Further, the content of the solvent is 10000ppm or less relative to the total amount of the resin layer, whereby the flexibility of the resin film is not excessively increased, and permanent deformation can be suppressed.
The resin layer contains at least one solvent selected from the group consisting of urea solvents, amide solvents containing an alkoxy group, and amide solvents containing an ester group. These solvents have functional groups with high polarity, and thus have a high boiling point and are not easily volatilized. Therefore, the content of the solvent in the resin layer is not easily changed with time. Therefore, the flexibility of the resin film is easily maintained, and even when repeated bending deformation is received in the bending portion, breakage in the bending portion can be suppressed.
Therefore, the resin film according to embodiment 1 can suppress occurrence of cracking in the bent portion even in the case of repeated bending.
The resin film according to embodiment 2 has a resin layer containing at least one solvent selected from the group consisting of urea solvents, amide solvents containing an alkoxy group, and amide solvents containing an ester group, and has a tensile breaking strength of 270N/mm 2 or more.
According to the above configuration, the resin film according to embodiment 2 can suppress occurrence of cracking in the bent portion even in the case of repeated bending. The reason for this is presumed as follows.
The resin film according to embodiment 2 has a resin layer containing at least one solvent selected from the group consisting of urea solvents, amide solvents containing an alkoxy group, and amide solvents containing an ester group. The flexibility of the resin film is improved by containing the solvent, and the content of the solvent in the resin layer is less likely to change with time for the same reasons as described above, so that the flexibility of the resin film is easily maintained.
Further, by setting the tensile breaking strength of the resin film to 270N/mm 2 or more, the stress generated in practical use is much smaller than the elastic limit.
Therefore, the resin film according to embodiment 2 can suppress occurrence of cracking in the bent portion even in the case of repeated bending.
Hereinafter, the resin films according to embodiment 1 and embodiment 2 will be described in detail. However, an example of the resin film of the present invention may be any resin film according to any one of embodiment 1 and embodiment 2.
(Resin layer)
Solvent-
The resin layer contains at least one solvent selected from the group consisting of urea solvents, amide solvents containing an alkoxy group, and amide solvents containing an ester group.
The content of the solvent is more than 2200ppm and 10000ppm or less relative to the total amount of the resin layer.
The content of the solvent is, for example, preferably 2500ppm to 9000ppm, more preferably 4000ppm to 8000ppm, and still more preferably 6000ppm to 7000ppm, based on the total amount of the resin layer, from the viewpoint of further suppressing occurrence of cracking in the bent portion.
The solvent (residual solvent) contained in the resin layer constituting the resin film can be measured by a gas chromatograph mass spectrometer (GC-MS) or the like by taking a measurement sample from the resin layer of the resin film to be measured. Specifically, analysis can be performed by a gas chromatograph mass spectrometer (GCMS QP-2010 manufactured by Shimadzu Corporation) provided with a drop-down pyrolysis device (Frontier Laboratories Ltd. Co., ltd.: PY-2020D).
From the resin layer, 0.40mg of the measurement sample was precisely weighed, and the solvent contained in the resin layer constituting the resin film was measured at a pyrolysis temperature of 400 ℃.
Pyrolysis device: frontier Laboratories ltd: PY-2020D
Gas chromatograph mass spectrometer: shimadzu Corporation GCMS QP-2010
Pyrolysis temperature: 400 DEG C
Gas chromatography introduction temperature: 280 DEG C
Inject method: split ratio 1:50
Chromatographic column: frontier Laboratories ltd: ultra ALLOY-5,0.25 μm,0.25 μm ID,30m
Gas chromatography temperature increase program: 40 ℃ = >20 ℃/min= >280 ℃ and 10 minutes of holding
The mass range is as follows: EI, m/z=29-600
Urea solvent
The urea solvent is a solvent having a ureido group (n—c (=o) -N). Specifically, the urea solvent is preferably a solvent having a structure of "×n (Ra 1)-C(＝O)-N(Ra2) -, for example. Here, ra 1 and Ra 2 each independently represent a hydrogen atom, an alkyl group, a phenyl group, or a phenylalkyl group. The two ends of the two N atoms represent bonding positions to atomic groups other than the structure. The urea solvent may be a solvent having a ring structure in which both ends of two N atoms are bonded to each other, for example, via a bonding group composed of an alkylene group, -O-, -C (=o) -or a combination thereof.
The alkyl group represented by Ra 1 and Ra 2 may have any of a chain, a branched chain, and a cyclic structure, or may have a substituent. Specific examples of the alkyl group include alkyl groups having 1 to 6 carbon atoms (for example, preferably 1 to 4 carbon atoms) (for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, etc.).
Examples of the substituent of the alkyl group include an alkoxy group having 1 to 4 carbon atoms, a hydroxyl group, a ketone group, an ester group, and an alkylcarbonyloxy group.
Specific examples of the ketone group include a methylcarbonyl group (acetyl group), an ethylcarbonyl group, and a n-propylcarbonyl group. Specific examples of the ester group include methoxycarbonyl, ethoxycarbonyl, n-propoxycarbonyl, and acetoxy. Specific examples of the alkylcarbonyloxy group include methylcarbonyloxy (acetoxy), ethylcarbonyloxy, n-propylcarbonyloxy and the like.
The phenyl skeleton of the phenyl group and the phenylalkyl group represented by Ra 1 and Ra 2 may have a substituent. Examples of the substituent of the phenyl skeleton include the same ones as those of the above alkyl group.
When the urea solvent has a ring structure in which both ends of the two N atoms are bonded, the number of ring members is preferably, for example, 5 or 6.
Examples of the urea solvent include 1, 3-dimethylurea, 1, 3-diethylurea, 1, 3-diphenylurea, 1, 3-dicyclohexylurea, tetramethylurea, tetraethylurea, 2-imidazolidinone, propenyl urea, 1, 3-dimethyl-2-imidazolidinone, and N, N-dimethylpropenyl urea.
Among them, from the viewpoint of further suppressing occurrence of cracks in the bent portion, the urea-based solvent is preferably, for example, 1, 3-dimethylurea, 1, 3-diethylurea, tetramethylurea, tetraethylurea, 1, 3-dimethyl-2-imidazolidone, N-dimethylpropylurea, and most preferably, tetramethylurea, tetraethylurea, 1, 3-dimethyl-2-imidazolidone, N-dimethylpropylurea.
Amide solvent containing alkoxy group and amide solvent containing ester group
The amide solvent containing an alkoxy group is a solvent having an alkoxy group and an amide group. On the other hand, the amide solvent containing an ester group is a solvent having an ester group and an amide group. Examples of the alkoxy group and the ester group include the same groups as those exemplified by "substituents of alkyl groups represented by Ra 1 and Ra 2" in the description of the urea solvent. The amide solvent having an alkoxy group may have an ester group, and the amide solvent having an ester group may have an alkoxy group.
Hereinafter, both of the amide-based solvent containing an alkoxy group and the amide-based solvent containing an ester group will be described as "alkoxy group or amide-based solvent containing an ester group".
The alkoxy group or ester group-containing amide solvent is not particularly limited, but specifically, an amide solvent represented by the following general formula (Am 1), an amide solvent represented by the following general formula (Am 2), or the like is preferable.
[ Chemical formula 1]
In the general formula (Am 1), rb 1、Rb2、Rb3、Rb4、Rb5 and Rb 6 each independently represent a hydrogen atom or an alkyl group. Rb 7 represents an alkoxy group or an ester group.
The alkyl group represented by Rb 1～Rb6 has the same meaning as "alkyl groups represented by Ra 1 and Ra 2" described in the description of the urea solvent.
The alkoxy group and the ester group represented by Rb 7 have the same meaning as the alkoxy group and the ester group exemplified by "substituents of alkyl groups represented by Ra 1 and Ra 2" in the description of the urea solvent.
Specific examples of the amide-based solvent represented by the general formula (Am 1) are shown below, but are not limited thereto.
[ Chemical formula 2]
In a specific example of the amide solvent represented by the general formula (Am 1), me=methyl, et=ethyl, npr=n-propyl, nbu=n-butyl.
[ Chemical formula 3]
In the general formula (Am 2), rc 1、Rc2、Rc3、Rc4、Rc5、Rc6、Rc7 and Rc 8 each independently represent a hydrogen atom or an alkyl group. Rc 9 represents an alkoxy group or an ester group.
The alkyl group represented by Rc 1～Rc8 has the same meaning as the "alkyl groups represented by Ra 1 and Ra 2" described in the description of the urea solvent.
The alkoxy group and the ester group represented by Rc 9 have the same meaning as the alkoxy group and the ester group exemplified by "substituents of alkyl groups represented by Ra 1 and Ra 2" in the description of the urea solvent.
Specific examples of the amide-based solvent represented by the general formula (Am 2) are shown below, but are not limited thereto.
[ Chemical formula 4]
In a specific example of the amide solvent represented by the general formula (Am 2), me=methyl, et=ethyl, npr=n-propyl.
Among them, from the viewpoint of further suppressing occurrence of cracks in the bent portion, the amide-based solvent having an alkoxy group or an ester group is preferably, for example, 3-methoxy-N, N-dimethylpropionamide (exemplified compound B-4), 3-N-butoxy-N, N-dimethylpropionamide (exemplified compound B-7), or 5-dimethylamino-2-methyl-5-oxopentanoic acid methyl ester (exemplified compound C-3), more preferably 3-methoxy-N, N-dimethylpropionamide (exemplified compound B-4).
The solvent is preferably at least one selected from the group consisting of an amide solvent containing an alkoxy group and an amide solvent containing an ester group, for example.
The amide solvent containing an alkoxy group and the amide solvent containing an ester group are easily dissolved in a material (for example, a resin) constituting the resin layer in the production of the resin film. Further, the solvent has a high boiling point, and is therefore not easily volatilized. Therefore, the content of the solvent in the resin layer is not easily changed with time. Therefore, the flexibility of the resin film is easily maintained, and even when repeated bending deformation is received in the bending portion, breakage in the bending portion can be suppressed.
The amide solvent containing an alkoxy group is preferably at least one selected from the group consisting of 3-methoxy-N, N-dimethylpropionamide and 3-N-butoxy-N, N-dimethylpropionamide, and the amide solvent containing an ester group is preferably 5-dimethylamino-2-methyl-5-oxopentanoic acid methyl ester.
As the solvent, for example, 3-methoxy-N, N-dimethylpropionamide is particularly preferable.
The use of the amide solvent containing an alkoxy group and the amide solvent containing an ester group makes it easier to dissolve a material (for example, a resin) constituting the resin layer in the production of the resin film. Further, the solvent has a high boiling point, and is therefore not easily volatilized. Therefore, the content of the solvent in the resin layer is not easily changed with time. Therefore, the flexibility of the resin film is easily maintained, and even when repeated bending deformation is received in the bending portion, breakage in the bending portion can be suppressed.
The boiling point of the solvent is, for example, preferably 200 ℃ to 280 ℃, more preferably 205 ℃ to 275 ℃, still more preferably 210 ℃ to 275 ℃.
The boiling point of the solvent is the boiling point at atmospheric pressure (101 kPa).
By setting the boiling point of the solvent to 200 ℃ or higher, the solvent is less likely to volatilize from the resin layer. Therefore, the content of the solvent in the resin layer is not easily changed with time. Therefore, the flexibility of the resin film is easily maintained, and even when repeated bending deformation is received in the bending portion, breakage in the bending portion can be suppressed.
In the method for producing a resin film described below, the boiling point of the solvent is set to 280 ℃ or less, so that the amount of the residual solvent after the heat treatment at about 300 ℃ in the calcination step is not excessive.
Resin-
The resin layer contains a resin. The resin is not particularly limited, but is preferably a polyimide resin from the viewpoint of suppressing occurrence of cracking in the bent portion.
The polyimide resin may be a polyimide obtained by imidizing a polyimide precursor described later.
The polyimide resin preferably has a structural unit derived from tetracarboxylic acid dihydrate and a structural unit derived from a diamine compound, for example.
In particular, the polyimide resin preferably has a structural unit derived from a diamine compound, for example, a structural unit derived from phenylenediamine and a structural unit derived from diaminodiphenyl ether.
Further, from the viewpoint of suppressing cracking in the bent portion, the content ratio of the structural unit derived from phenylenediamine and the structural unit derived from diaminodiphenyl ether (structural unit derived from phenylenediamine/structural unit derived from diaminodiphenyl ether) in the polyimide resin is preferably 80/20 or more and 99.7/0.3 or less, more preferably 85/15 or more and 95/5 or less in terms of a molar ratio, for example.
The content of the structural units was measured as follows.
First, from several mixed samples of phenylenediamine and diaminodiphenyl ether in known mixing ratios, a peak intensity ratio of 1515cm -1 (peak derived from phenylenediamine) and a peak intensity ratio of 1500cm -1 (peak derived from diaminodiphenyl ether) were obtained by measurement with an infrared spectrophotometer (IR), and the peak intensity ratio, mixing ratio and calibration curve were drawn.
Next, the peak intensity ratio is obtained from a sample of the resin layer of the resin film to be measured by measurement with an infrared spectrophotometer (IR), and the mixing ratio is calculated from a calibration curve. The obtained mixing ratio was set as the content ratio of the structural unit derived from phenylenediamine and the structural unit derived from diaminodiphenyl ether in the polyimide resin.
Here, the structural unit of the monomer derived from the resin forming the resin layer can be measured by analyzing and quantifying a component detected by, for example, pyrolysis gas chromatography mass spectrometry (GC-MS). Specifically, first, a sample for measuring a resin layer is prepared from a resin film to be measured. Next, the measurement sample was measured by a gas chromatograph mass spectrometer (Shimadzu Corporation: GCMS QP-2010) provided with a drop-down pyrolysis device (Frontier Laboratories ltd: PY-2020D). Then, the monomer units of the polyimide resin were decomposed by a pyrolysis gas chromatography mass spectrometry device, and the structure and the ratio of the monomers were determined from mass analysis of the decomposed product obtained by the decomposition.
Conductive particles-
If necessary, the resin layer constituting the resin film according to the present embodiment may contain conductive particles added to impart conductivity. Examples of the conductive particles include particles having conductivity (for example, volume resistivity of less than 10 7 Ω·cm, the same applies hereinafter) and semiconductive (for example, volume resistivity of 10 7 Ω·cm or more and 10 13 Ω·cm or less, the same applies hereinafter), and the purpose of use is selected.
Examples of the conductive particles include carbon black, metals (e.g., aluminum, nickel, etc.), metal oxides (e.g., yttrium oxide, tin oxide, etc.), ion conductive substances (e.g., potassium titanate, liCl, etc.), and the like.
These conductive particles may be used singly or in combination of two or more. The conductive particles are particles having a primary particle diameter of, for example, preferably less than 10 μm (for example, preferably 1 μm or less).
Among them, the conductive particles are preferably carbon black, and particularly preferably acidic carbon black having a ph of 5.0 or less.
Examples of the acidic carbon black include carbon blacks having surfaces subjected to oxidation treatment, for example, carbon blacks having surfaces to which carboxyl groups, quinone groups, lactone groups, hydroxyl groups, and the like are added.
When the acid carbon black is applied to a transfer belt having a resin layer containing a polyimide resin, the acid carbon black is preferably a carbon black having a ph of 4.5 or less, more preferably a carbon black having a ph of 4.0 or less, from the viewpoints of temporal stability of electric resistance and suppression of electric field dependency of electric field concentration due to transfer voltage.
The pH of the acidic carbon black is a value measured by a pH measurement method defined in JIS Z8802 (2011).
Specifically, examples of the carbon black include "MONARCH" manufactured by "SPECIAL BLACK350"、"SPECIAL BLACK100"、"SPECIAL BLACK250"、"SPECIAL BLACK5"、"SPECIAL BLACK4"、"SPECIAL BLACK4A"、"SPECIAL BLACK550"、"SPECIAL BLACK6"、"CALLA BLACKFW FW200"、"CALLA BLACKFW FW2"、"CALLA BLACKFW FW2V"、Cabot Corporation and "MONARCH1300", "MONARCH1400", "MOGUL-L" and "REGAL400R" manufactured by Orion Engineered Carbons s.a. and "Cabot Corporation.
The content of the conductive particles is not particularly limited, but is preferably 1 part by mass or more and 40 parts by mass or less (for example, preferably 10 parts by mass or more and 30 parts by mass or less) per 100 parts by mass of the resin layer from the viewpoint of the appearance, mechanical properties and electrical properties of the resin film.
(Other additives)
The resin layer constituting the resin film according to the present embodiment may contain various fillers and the like for the purpose of imparting various functions such as mechanical strength. When the resin layer contains polyimide as a resin, a catalyst for promoting imidization, a leveling material for improving the quality of a film, or the like may be contained.
Examples of fillers added to improve mechanical strength include particulate materials such as silica powder, alumina powder, barium sulfate powder, titanium oxide powder, mica, and talc. In order to improve the hydrophobicity and the anti-sticking property of the resin layer surface, a fluororesin powder such as Polytetrafluoroethylene (PTFE) or tetrafluoroethylene perfluoroalkyl vinyl ether copolymer (PFA) may be added.
As the catalyst for promoting imidization, a dehydrating agent such as an acid anhydride, an acid catalyst such as a phenol derivative, a sulfonic acid derivative, a benzoic acid derivative, or the like can be used.
In order to improve the film quality of the resin layer, a surfactant may be added. The surfactant used may be any of cationic, anionic, and nonionic surfactants.
The content of the other additives may be selected according to the intended characteristics of the resin layer.
(Layer structure)
The resin film according to the present embodiment may be used as the resin film directly as the resin layer. The resin film may be a laminate having a functional layer such as an anti-adhesive layer on at least one of the inner peripheral surface and the outer peripheral surface of the resin layer.
(Physical Properties of resin film)
The resin film according to the present embodiment has, for example, a number of times of folding resistance in an MIT test using a jig having a radius of curvature R of 2mm of preferably 300,000 or more, more preferably 400,000 or more, and still more preferably 500,000 or more.
The number of bending resistance based on the above MIT test indicates the number of bending times until the resin film breaks when the resin film is repeatedly bent. Therefore, by setting the number of times of bending resistance based on the above MIT test to 300,000 or more, a resin film is formed that further suppresses occurrence of breakage in the bending portion even in the case of repeated bending.
The number of folding-resistance times based on the MIT test was determined as follows.
MIT test was in accordance with JIS P8115: 2001 (MIT tester method).
Specifically, a long test piece having a width of 15mm and a length of 200mm was cut out from the resin film in the circumferential direction. The two ends of the long test piece were fixed, and a tensile force of 1kgf was applied thereto, and the test piece was repeatedly bent (folded) in the left and right directions by 90 ° with a jig having a radius of curvature r=2 mm as a fulcrum. At this time, the number of times until the long test piece breaks was set as the number of times of breaking.
The MIT test was performed in an environment of a temperature of 22℃and a humidity of 55% RH.
The tensile breaking strength of the resin film according to the present embodiment is 270N/mm 2 or more.
From the viewpoint of further suppressing occurrence of cracking in the bent portion, for example, the tensile breaking strength is preferably 320N/mm 2 to 500N/mm 2, more preferably 375N/mm 2 to 475N/mm 2, still more preferably 400N/mm 2 to 450N/mm 2.
Tensile break strength was measured as follows.
A test piece having a long shape and a width of 5mm was cut out from the resin film, and the cut test piece was set in a tensile tester Model 1605N (Aikoh Engineering Co., ltd.) to obtain a tensile breaking strength at a constant speed of 10 mm/sec.
(Method for producing resin film)
The resin film according to the present embodiment is preferably obtained, for example, by applying a coating liquid for forming a resin film to an object to be coated, and then drying and calcining the object.
Specifically, the following method is exemplified as a method for producing the resin film.
The method for producing a resin film includes, for example, a step of applying a polyimide precursor composition to a cylindrical substrate (mold) to form a coating film (coating film forming step), a step of drying the coating film formed on the substrate to form a dried film (drying step), a step of imidizing (heat treating) the dried film to imidize the polyimide precursor to form a molded body of a polyimide resin (calcination step), and a step of removing the molded body of the polyimide resin from the substrate to form a resin film (removal step). The polyimide resin molded article is a resin layer. Specifically, for example, the following is possible.
The polyimide precursor composition is the same as that described below as "-polyimide precursor composition-".
First, a polyimide precursor composition is applied to the inner surface or the outer surface of a cylindrical substrate to form a coating film. As the cylindrical substrate, for example, a cylindrical metal substrate is preferably used. Instead of the metal, a base material made of other materials such as resin, glass, and ceramic may be used. The surface of the substrate may be provided with a glass coating, a ceramic coating, or the like, or may be coated with a release agent such as silicone or fluorine.
The shape of the base material is not limited to a cylindrical shape, and a plate-like shape is selected according to the application of the resin film.
Here, in order to apply the polyimide precursor composition with high accuracy, for example, a step of defoaming the polyimide precursor composition before application is preferably performed. By defoaming the polyimide precursor composition, the occurrence of bubbles and defects in the coating film during the coating process is suppressed.
Examples of the method for defoaming the polyimide precursor composition include a method for setting the polyimide precursor composition to a reduced pressure state and a method for performing centrifugal separation, but defoaming in a reduced pressure state is simple and has a large defoaming ability, and thus is suitably used.
Next, the cylindrical substrate on which the coating film of the polyimide precursor composition is formed is placed under a heating or vacuum environment, and the coating film is dried to form a dried film. The solvent is preferably volatilized at 30 mass% or more, for example, 50 mass% or more.
Next, imidization (heat treatment) is performed on the dried film. Thereby, a molded article of polyimide resin is formed.
As the heating conditions for the imidization treatment, for example, imidization is caused by heating at 150 ℃ to 400 ℃ (for example, preferably 200 ℃ to 300 ℃) for 20 minutes to 60 minutes, thereby forming a molded polyimide resin. In the heating reaction, for example, the heating is preferably performed by raising the temperature stepwise or gradually at a constant rate before the final temperature of the heating is reached. The imidization temperature varies depending on, for example, the types of tetracarboxylic dianhydride and diamine used as raw materials, and if imidization is insufficient, mechanical properties and electrical properties are deteriorated, and thus the temperature at which imidization is completed is set.
Then, the molded body of polyimide resin was removed from the cylindrical substrate to obtain a resin film.
When a resin film having a functional layer such as an anti-adhesive layer is obtained in addition to the resin layer, the functional layer is formed appropriately on a molded body of polyimide resin to obtain the resin film.
Polyimide precursor composition
The polyimide precursor composition is a polyimide precursor composition containing a resin having a repeating unit represented by the general formula (I) (hereinafter referred to as "polyimide precursor") and at least one solvent selected from the group consisting of urea-based solvents, amide-based solvents containing an alkoxy group, and amide-based solvents containing an ester group.
The polyimide precursor composition contains a polyimide precursor containing at least one of two or more structural units derived from tetracarboxylic dianhydride and structural units derived from a diamine compound. The polyimide precursor may be a copolymer having a repeating unit represented by the general formula (I), or may be a mixture of homopolymers having a repeating unit represented by the general formula (I) and different in kind from each other.
In addition, the polyimide precursor composition may contain conductive particles and other additives, as necessary.
(Polyimide precursor)
The polyimide precursor may be a resin (polyamic acid) having a repeating unit represented by the general formula (I).
[ Chemical formula 5]
In the general formula (I), A represents a tetravalent organic group, and B represents a divalent organic group.
In the general formula (I), the tetravalent organic group represented by a is a residue obtained by removing four carboxyl groups from tetracarboxylic dianhydride which is a raw material.
On the other hand, the divalent organic group represented by B is a residue obtained by removing two amino groups from a diamine compound serving as a raw material.
That is, the polyimide precursor having the repeating unit represented by the general formula (I) is a polymer of tetracarboxylic dianhydride and a diamine compound. That is, the polyimide precursor contains a component derived from tetracarboxylic dianhydride and a component derived from a diamine compound.
The tetracarboxylic dianhydride may be any of aromatic compounds and aliphatic compounds, for example, but is preferably an aromatic compound. That is, in the general formula (I), the tetravalent organic group represented by A is preferably an aromatic organic group, for example.
4,4' -Dimethyldiphenylsilane tetracarboxylic dianhydride 3,3',4,4' -Dimethyldiphenylsilane tetracarboxylic dianhydride, 3',4,4' -tetraphenylsilane tetracarboxylic dianhydride, 1,2,3, 4-furantetracarboxylic dianhydride, 4' -bis (3, 4-dicarboxyphenoxy) diphenyl sulfide dianhydride, 4' -bis (3, 4-dicarboxyphenoxy) diphenyl sulfone dianhydride, 4' -bis (3, 4-dicarboxyphenoxy) diphenyl propane dianhydride, 3',4,4' -perfluoro isopropylidene diphthalic dianhydride, 3',4' -biphenyl tetracarboxylic dianhydride, 2, 3',4' -biphenyl tetracarboxylic dianhydride, bis (phthalic) phenylphosphine oxide dianhydride, p-phenylene-bis (triphenylphosphine phthalic) dianhydride, m-phenylene-bis (triphenylphosphine phthalic) dianhydride, bis (triphenylphosphine phthalic) -4,4' -diphenyl ether dianhydride, bis (triphenylphosphine phthalic) -4,4' -diphenylmethane dianhydride, 4' -oxydiphthalic anhydride (ODPA), and the like.
Examples of the aliphatic tetracarboxylic dianhydride include aliphatic or alicyclic tetracarboxylic dianhydrides such as butane tetracarboxylic dianhydride, 1,2,3, 4-cyclobutane tetracarboxylic dianhydride, 1, 3-dimethyl-1, 2,3, 4-cyclobutane tetracarboxylic dianhydride, 1,2,3, 4-cyclopentane tetracarboxylic dianhydride, 2,3, 5-tricarboxycyclopentylacetic dianhydride, 3,5, 6-tricarboxydantorbornane-2-acetic dianhydride, 2,3,4, 5-tetrahydrofuran tetracarboxylic dianhydride, 5- (2, 5-dioxotetrahydrofurfuryl) -3-methyl-3-cyclohexene-1, 2-dicarboxylic dianhydride, and bicyclo [2, 2] -oct-7-ene-2, 3,5, 6-tetracarboxylic dianhydride; aliphatic tetracarboxylic dianhydrides having aromatic rings such as 1, 3a,4,5,9 b-hexahydro- (2, 5-dioxo-3-furyl) -naphtho [1,2-c ] furan-1, 3-dione, 1, 3a,4,5,9 b-hexahydro-5-methyl-5- (tetrahydro-2, 5-dioxo-3-furyl) -naphtho [1,2-c ] furan-1, 3-dione, and 1, 3a,4,5,9 b-hexahydro-8-methyl-5- (tetrahydro-2, 5-dioxo-3-furyl) -naphtho [1,2-c ] furan-1, 3-dione, and the like.
Among them, the tetracarboxylic dianhydride is preferably an aromatic tetracarboxylic dianhydride, specifically, for example, pyromellitic dianhydride, 3',4,4' -biphenyltetracarboxylic dianhydride, 2, 3',4' -biphenyltetracarboxylic dianhydride, 3',4' -biphenylether tetracarboxylic dianhydride, 3', the 4,4' -benzophenone tetracarboxylic acid dianhydride and the 4,4 '-oxydiphthalic acid dianhydride are more preferably pyromellitic acid dianhydride, 3',4 '-biphenyl tetracarboxylic acid dianhydride, 3',4 '-benzophenone tetracarboxylic acid dianhydride and 4,4' -oxydiphthalic acid dianhydride, and particularly preferably 3,3',4' -biphenyl tetracarboxylic acid dianhydride.
The tetracarboxylic dianhydride may be used alone or in combination of two or more.
When two or more kinds of the aromatic tetracarboxylic acid dianhydrides are used in combination, they may be used singly or in combination, or they may be used in combination.
When the polyimide precursor contains two or more structural units derived from tetracarboxylic dianhydride, the mode of the structural units derived from tetracarboxylic dianhydride is not particularly limited. For example, the structural unit derived from tetracarboxylic dianhydride may be contained as a copolymer or a mixture of copolymers using two or more tetracarboxylic dianhydrides. The polymer may be a mixture of a homopolymer of one tetracarboxylic dianhydride and a homopolymer or copolymer of a different tetracarboxylic dianhydride.
In the case where the polyimide precursor contains two or more structural units derived from tetracarboxylic dianhydride at the point of suppressing occurrence of cracks during meandering, it is preferable that the component derived from tetracarboxylic dianhydride contains, for example, structural units derived from 3,3', 4' -biphenyl tetracarboxylic dianhydride.
In particular, when the polyimide precursor contains a structural unit derived from 3,3', 4' -biphenyltetracarboxylic dianhydride, the content of the structural unit derived from 3,3', 4' -biphenyltetracarboxylic dianhydride relative to the total amount of structural units derived from tetracarboxylic dianhydride is preferably, for example, 70 mass% or more and 99 mass% or less (for example, preferably 80 mass% or more and 95 mass% or less).
On the other hand, the diamine compound is a diamine compound having two amino groups in a molecular structure. The diamine compound may be any of aromatic compounds and aliphatic compounds, but is preferably an aromatic compound, for example. That is, in the general formula (I), the divalent organic group represented by B is preferably an aromatic organic group, for example.
As the diamine compound, a diamine compound having a diamine group, examples thereof include p-phenylenediamine, m-phenylenediamine, 4 '-diaminodiphenyl ethane, 4' -diaminodiphenyl ether, 4 '-diaminodiphenyl sulfide, 4' -diaminodiphenyl sulfone, 1, 5-diaminonaphthalene, 3-dimethyl-4, 4 '-diaminobiphenyl, 5-amino-1- (4' -aminophenyl) -1, 3-trimethylindan, and the like 6-amino-1- (4 '-aminophenyl) -1, 3-trimethylindane, 4' -diaminobenzanilide, 3, 5-diamino-3 '-trifluoromethylbenzanilide, 3, 5-diamino-4' -trifluoromethylbenzanilide, 3,4 '-diaminodiphenyl ether, 2, 7-diaminofluorene, 2-bis (4-aminophenyl) hexafluoropropane, 4' -methylene-bis (2-chloroaniline), 2',5,5' -tetrachloro-4, 4 '-diaminobiphenyl, 2' -dichloro-4, 4 '-diamino-5, 5' -dimethoxybiphenyl, 3 '-dimethoxy-4, 4' -diaminobiphenyl, 4 '-diamino-2, 2' -bis (trifluoromethyl) biphenyl, 2-bis [4- (4-aminophenoxy) phenyl ] propane, 2-bis [4- (4-aminophenoxy) phenyl ] hexafluoropropane, 1, 4-bis (4-aminophenoxy) benzene, aromatic diamines such as 4,4 '-bis (4-aminophenoxy) -biphenyl, 1,3' -bis (4-aminophenoxy) benzene, 9-bis (4-aminophenyl) fluorene, 4'- (p-phenylene isopropylidene) diphenylamine, 4' - (m-phenylene isopropylidene) diphenylamine, 2 '-bis [4- (4-amino-2-trifluoromethylphenoxy) phenyl ] hexafluoropropane, and 4,4' -bis [4- (4-amino-2-trifluoromethyl) phenoxy ] -octafluorobiphenyl; an aromatic diamine having 2 amino groups bonded to an aromatic ring and having a heteroatom other than nitrogen atom of the amino group, such as diaminotetraphenyl thiophene; aliphatic diamines such as 1, 1-m-xylylenediamine, 1, 3-propane diamine, tetramethylenediamine, pentamethylene diamine, octamethylene diamine, nonamethylene diamine, 4-diaminoheptamethylene diamine, 1, 4-cyclohexanediamine, isophorone diamine, tetrahydrodicyclopentadiene diamine, hexahydro-4, 7-methyleneindene dimethylene diamine, tricyclo [6,2,1,0 2.7 ] -undecylene dimethylene diamine, and 4,4' -methylenebis (cyclohexylamine), alicyclic diamines, and the like.
Among them, for example, aromatic diamine compounds are preferable, and specifically, for example, p-phenylenediamine, m-phenylenediamine, 4 '-diaminodiphenylmethane, 4' -diaminodiphenyl ether, 3,4 '-diaminodiphenyl ether, 4' -diaminodiphenyl sulfide, and 4,4 '-diaminodiphenyl sulfone are preferable, and p-phenylenediamine and 4,4' -diaminodiphenyl ether are particularly preferable.
The diamine compound may be used alone or in combination of two or more. In the point where breakage occurs when meandering is suppressed, for example, two or more diamine compounds are preferably used. When two or more kinds of the aromatic diamine compounds are used in combination, the aromatic diamine compounds or the aliphatic diamine compounds may be used singly or in combination.
When the polyimide precursor contains two or more structural units derived from a diamine compound, the manner of the structural units derived from the diamine compound is not particularly limited. For example, the structural unit derived from the diamine compound may be contained as a copolymer or a mixture of copolymers using two or more diamine compounds. The polymer may be a mixture of a homopolymer of one diamine compound and a homopolymer or copolymer of a different diamine compound.
When the polyimide precursor contains two or more structural units derived from a diamine compound, it is preferable that the polyimide precursor contains at least a structural unit derived from p-phenylenediamine or a structural unit derived from diaminodiphenyl ether (4, 4' -diaminodiphenyl ether, etc.), for example, at a point where cracking in the bending portion is suppressed. At the same point, both structural units derived from p-phenylenediamine and structural units derived from diaminodiphenyl ether may be included. Among them, for example, it is preferable that the composition contains at least a structural unit derived from p-phenylenediamine.
In particular, when the polyimide precursor contains a structural unit derived from p-phenylenediamine, the content of the structural unit derived from p-phenylenediamine relative to the total amount of the structural units derived from the diamine compound is preferably, for example, 70 mass% or more and 90 mass% or less (for example, preferably 75 mass% or more and 85 mass% or less).
For example, when two or more structural units derived from a diamine compound are contained, as described above, a combination of a structural unit derived from p-phenylenediamine and a structural unit derived from diaminodiphenyl ether (4, 4' -diaminodiphenyl ether, etc.) is preferable.
The content ratio of the structural unit derived from p-phenylenediamine to the structural unit derived from diaminodiphenyl ether is preferably, for example, 70/30 or more and 90/10 or less in terms of mass ratio at the point of suppressing occurrence of cracking in the bent portion.
From the same viewpoint, the content ratio of the structural unit derived from phenylenediamine and the structural unit derived from diaminodiphenyl ether (structural unit derived from phenylenediamine/structural unit derived from diaminodiphenyl ether) is preferably 80/20 or more and 99.7/0.3 or less, more preferably 85/15 or more and 95/5 or less in terms of molar ratio, for example.
The polyimide precursor may be a part of the imidized resin.
Specifically, examples of the polyimide precursor include resins having repeating units represented by the general formulae (I-1), (I-2) and (I-3).
[ Chemical formula 6]
In the general formulae (I-1), (I-2) and (I-3), A represents a tetravalent organic group and B represents a divalent organic group. A and B have the same meaning as A and B in the general formula (I).
L represents an integer of 1 or more, and m and n each independently represent an integer of 0 or 1 or more.
Here, the ratio of the number of bonded parts (2n+m) of imide ring closure to the total number of bonded parts (2l+2m+2n) in the bonded parts of the polyimide precursor (the reaction part of the tetracarboxylic dianhydride and the diamine compound), that is, the imidization ratio of the polyimide precursor is represented by "(2n+m)/(2l+2m+2n)". This value is, for example, preferably 0.2 or less, more preferably 0.15 or less, and most preferably 0.1 or less.
When the imidization ratio is within this range, gelation and precipitation separation of the polyimide precursor are suppressed.
In addition, the imidization ratio ("(2n+m)/(2l+2m+2n)" value) of the polyimide precursor was measured by the following method.
Determination of the imidization Rate of polyimide precursor
Preparation of polyimide precursor sample
(I) A polyimide precursor composition to be measured is applied to a silicon wafer in a film thickness of 1 μm or more and 10 μm or less to prepare a coating film sample.
(Ii) After immersing the film sample in Tetrahydrofuran (THF) for 20 minutes, the solvent in the film sample was replaced with Tetrahydrofuran (THF). The solvent for impregnation is not limited to THF, and may be selected from solvents that do not dissolve the polyimide precursor and that can be mixed with the solvent components contained in the polyimide precursor composition. Specifically, an alcohol solvent such as methanol or ethanol and an ether compound such as dioxane can be used.
(Iii) The coated film sample was taken out of THF, and N 2 gas was blown to remove THF adhering to the coated film sample surface. The coated film sample was dried by treating it at a reduced pressure of 10mmHg or less at a temperature in the range of 5 ℃ to 25 ℃ for 12 hours to prepare a polyimide precursor sample.
Preparation of 100% imidized Standard sample
(Iv) A polyimide precursor composition to be measured was coated on a silicon wafer in the same manner as in (i) above to prepare a coating film sample.
(V) The coating film sample was heated at 380℃for 60 minutes to carry out imidization reaction, to prepare a 100% imidization standard sample.
Measurement and analysis
(Vi) The infrared absorption spectra of 100% imidized standard sample and polyimide precursor sample were measured using a Fourier transform infrared spectrophotometer (HORIBA, FT-730, manufactured by Ltd.). The ratio I ' (100) of the absorption peak (Ab ' (1780 cm -1)) derived from an imide bond near 1780cm -1 to the absorption peak (Ab ' (1500 cm -1)) derived from an aromatic ring near 1500cm -1 of a 100% imidization standard sample was obtained.
(Vii) In the same manner, the polyimide precursor sample was measured to determine the ratio I (x) of the absorption peak (Ab (1780 cm -1)) derived from an imide bond near 1780cm -1 to the absorption peak (Ab (1500 cm -1)) derived from an aromatic ring near 1500cm -1.
Then, the imidization ratio of the polyimide precursor was calculated from the following formula using the measured absorption peaks I' (100), I (x).
Formula (la): imidization ratio of polyimide precursor=i (x)/I' (100)
Formula (la): i '(100) = (Ab' (1780 cm -1))/(Ab'(1500cm-1))
Formula (la): i (x) = (Ab (1780 cm -1))/(Ab(1500cm-1))
The measurement of the imidization rate of the polyimide precursor is applicable to the measurement of the imidization rate of an aromatic polyimide precursor. When the imidization ratio of the aliphatic polyimide precursor is measured, instead of the absorption peak derived from the aromatic ring, a peak derived from a structure which does not change before and after the imidization reaction is used as an internal standard peak.
Terminal amino-groups of polyimide precursors
For example, the polyimide precursor preferably contains a polyimide precursor (resin) having amino groups at the terminals, and is preferably a polyimide precursor having amino groups at all the terminals.
In order to hold the amino group at the molecular end of the polyimide precursor, for example, the molar equivalent of the diamine compound used in the polymerization reaction is excessively added in comparison with the molar equivalent of the tetracarboxylic dianhydride. The molar equivalent ratio of the tetracarboxylic dianhydride to the diamine compound is, for example, preferably in the range of 0.92 to 0.9999, more preferably in the range of 0.93 to 0.999, relative to 1.
When the molar equivalent ratio of the diamine compound to the tetracarboxylic dianhydride is 0.9 or more, the effect of the amino group at the molecular terminal is remarkable, and good dispersibility is easily obtained. When the molar equivalent ratio is 0.9999 or less, the molecular weight of the obtained polyimide precursor is large, and for example, when the polyimide precursor is a molded article of a polyimide resin, sufficient strength (tear strength, tensile strength) is easily obtained.
The terminal amino groups of the polyimide precursor are detected by reacting trifluoroacetic anhydride (quantitatively reacting with the amino groups) in the polyimide precursor composition. That is, the terminal amino group of the polyimide precursor is trifluoroacetylated by trifluoroacetic anhydride. After the treatment, a polyimide precursor or the like is precipitated again to purify it, thereby removing excess trifluoroacetic anhydride and trifluoroacetic acid residues. The amount of the terminal amino group in the polyimide precursor was measured by quantifying the amount of fluorine atoms introduced into the polyimide precursor by nuclear magnetic resonance (19 F-NMR) of the polyimide precursor after the treatment.
The number average molecular weight of the polyimide precursor is, for example, preferably 5,000 to 100,000, more preferably 7,000 to 50,000, still more preferably 10,000 to 30,000.
When the number average molecular weight of the polyimide precursor is within the above range, the solubility of the polyimide precursor in the composition and the mechanical properties of the film after film formation become good.
Further, by adjusting the molar equivalent ratio of the tetracarboxylic dianhydride to the diamine compound, a polyimide precursor having a desired number average molecular weight can be obtained.
The number average molecular weight of the polyimide precursor was measured by Gel Permeation Chromatography (GPC) under the following measurement conditions.
Chromatographic column: TOSOH CORPORATION TSKgel α -M (7.8 mm I.D.times.30cm)
Eluent: DMF (dimethylformamide)/30 mMLiBr/60mM phosphoric acid
Flow rate: 0.6mL/min
Injection amount: 60 mu L
Detector: RI (differential refractive index detector)
The content (concentration) of the polyimide precursor may be, for example, 0.1 mass% or more and 40 mass% or less, preferably 0.5 mass% or more and 25 mass% or less, and more preferably 1 mass% or more and 20 mass% or less, relative to the total polyimide precursor composition.
Method for producing polyimide precursor composition
The method for producing the polyimide precursor composition is not particularly limited. For example, a method of polymerizing the tetracarboxylic dianhydride and the diamine compound in a solvent containing at least one solvent selected from the group consisting of urea solvents, amide solvents containing an alkoxy group, and amide solvents containing an ester group to obtain a polyimide precursor is exemplified.
The reaction temperature at the time of polymerization of the polyimide precursor is, for example, from 0 ℃ to 70 ℃, preferably from 10 ℃ to 60 ℃, more preferably from 20 ℃ to 55 ℃. By setting the reaction temperature to 0 ℃ or higher, the progress of the polymerization reaction is promoted, the time required for the reaction is shortened, and the productivity is easily improved. On the other hand, when the reaction temperature is 70 ℃ or lower, progress of imidization reaction occurring in the molecule of the polyimide precursor to be produced is suppressed, and precipitation or gelation accompanied by a decrease in solubility of the polyimide precursor is easily suppressed.
The time for polymerization of the polyimide precursor is preferably in the range of 1 to 24 hours, for example, depending on the reaction temperature.
[ Use example of resin film ]
The resin film according to the present embodiment can be used as an endless belt.
The resin film according to the present embodiment can be used as a functional layer of a part that is repeatedly bent in the life cycle of a product called Dynamic Flex (Dynamic flexibility) in a flexible printed circuit board (FPC: flexible Print Circuit), for example. Examples of the Dynamic Flex include a hard disk drive, an optical pickup, and a hinge of a mobile phone.
The resin film according to the embodiment can be used as an electric insulating material, a pipe coating material, an electromagnetic wave insulating material, a heat source insulator, or an electromagnetic wave absorbing film.
< Annular band >)
The endless belt according to the present embodiment is formed of the resin film according to the present embodiment described above. That is, the endless belt according to the present embodiment has a resin layer containing at least one solvent selected from the group consisting of a urea-based solvent, an amide-based solvent containing an alkoxy group, and an amide-based solvent containing an ester group, and the content of the solvent is more than 2200ppm and 10000ppm or less relative to the total amount of the resin layer.
The endless belt according to the present embodiment can be used as an endless belt for an image forming apparatus of an electrophotographic system, for example. Examples of the endless belt for an electrophotographic image forming apparatus include an intermediate transfer belt, a transfer belt (recording medium belt), a fixing belt (heating belt, pressing belt), and a belt (recording medium belt). The endless belt according to the present embodiment can be used for belt-like members such as a conveyor belt, a driving belt, a laminate belt, an electric insulating material, a pipe coating material, an electromagnetic wave insulating material, a heat source insulator, and an electromagnetic wave absorbing film, in addition to the endless belt for an image forming apparatus.
< Image Forming apparatus >
The image forming apparatus according to the present embodiment includes the endless belt. When the endless belt is applied to a belt such as an intermediate transfer belt, a transfer belt, or a conveyor belt (recording medium conveyor belt), the image forming apparatus according to the present embodiment is exemplified by the following image forming apparatus.
The image forming apparatus includes an image holder, a charging device for charging a surface of the image holder, an electrostatic charge image forming device for forming an electrostatic charge image on the surface of the charged image holder, a developing device for developing the electrostatic charge image formed on the surface of the image holder with a developer containing toner as a toner image, and a transfer device for transferring the toner image to a surface of a recording medium via an endless belt according to the present embodiment.
The transfer device may have an endless belt unit described later.
The image forming apparatus according to the present embodiment preferably has at least one member selected from the group consisting of a transfer device and a fixing device, for example, provided with the endless belt according to the present embodiment.
When the fixing device includes the endless belt according to the present embodiment, the image forming apparatus according to the present embodiment includes, for example, a transfer device including an intermediate transfer member, a primary transfer device that primarily transfers the toner image formed on the image holder to the intermediate transfer member, and a secondary transfer device that secondarily transfers the toner image transferred to the intermediate transfer member to the recording medium, and the endless belt according to the present embodiment is provided as the intermediate transfer member.
When the fixing device has the endless belt according to the present embodiment, the image forming apparatus according to the present embodiment is preferably applied to a belt such as a fixing belt (heating belt, pressing belt), for example. Specifically, an image forming apparatus described below is exemplified.
Examples of the toner image include an image holder, a charging device for charging a surface of the image holder, an electrostatic charge image forming device for forming an electrostatic charge image on the surface of the charged image holder, a developing device for developing the electrostatic charge image formed on the surface of the image holder with a developer containing toner as a toner image, a transfer device for transferring the toner image to a recording medium, and a fixing device for fixing the toner image to the recording medium. As the fixing device, a fixing device including a1 st rotation body and a2 nd rotation body disposed in contact with an outer surface of the 1 st rotation body, wherein at least one of the 1 st rotation body and the 2 nd rotation body is an endless belt of the present embodiment, is applicable.
The image forming apparatus according to the present embodiment may be configured such that the transfer device includes, for example, a recording medium transport member (recording medium transport belt) for transporting the recording medium and a transfer device for transferring the toner image formed on the image holding member to the recording medium transported by the recording medium transport member, and the endless belt according to the present embodiment is provided as the recording medium transport member.
Examples of the image forming apparatus according to the present embodiment include a normal monochromatic image forming apparatus in which only monochromatic toner is accommodated in a developing device, a color image forming apparatus in which toner images held on image holders are sequentially transferred repeatedly onto an intermediate transfer member, and a tandem color image forming apparatus in which a plurality of image holders each having a developer of each color are arranged in series on the intermediate transfer member.
The image forming apparatus according to the present embodiment will be described below with reference to the drawings.
Fig. 1 is a schematic configuration diagram illustrating an example of an image forming apparatus according to the present embodiment. The image forming apparatus shown in fig. 1 is an image forming apparatus to which the endless belt according to the present embodiment described above is applied to an intermediate transfer body (intermediate transfer belt).
As shown in fig. 1, an image forming apparatus 100 according to the present embodiment is, for example, a so-called tandem system, in which charging devices 102a to 102d, exposure devices 114a to 114d, developing devices 103a to 103d, primary transfer devices (primary transfer rollers) 105a to 105d, and image holder cleaning devices 104a to 104d are disposed in this order along the rotation direction around four image holders 101a to 101d made of electrophotographic photoreceptors. In addition, in order to remove the residual potential remaining on the surface of the image holders 101a to 101d after transfer, a static eliminator may be provided.
The intermediate transfer belt 107 is supported by support rollers 106a to 106d, a driving roller 111, and a counter roller 108 while tension is applied thereto, and forms an endless belt unit 107b. The intermediate transfer belt 107 can move the image holders 101a to 101d and the primary transfer rollers 105a to 105d in the direction of arrow a while contacting the surfaces of the image holders 101a to 101d by the support rollers 106a to 106d, the driving roller 111, and the counter roller 108. The portions of the primary transfer rollers 105a to 105d that contact the image holders 101a to 101d via the intermediate transfer belt 107 become primary transfer portions, and a primary transfer voltage is applied to the contact portions of the image holders 101a to 101d and the primary transfer rollers 105a to 105 d.
As the secondary transfer device, a counter roller 108 and a secondary transfer roller 109 are disposed to face each other via an intermediate transfer belt 107 and a secondary transfer belt 116. The secondary transfer belt 116 is supported by the secondary transfer roller 109 and the backup roller 106 e. The recording medium 115 such as paper moves in the direction of arrow B in a region sandwiched by the intermediate transfer belt 107 and the secondary transfer roller 109 while being in contact with the surface of the intermediate transfer belt 107, and then passes through the fixing device 110. The portion of the secondary transfer roller 109 in contact with the counter roller 108 via the intermediate transfer belt 107 and the secondary transfer belt 116 serves as a secondary transfer portion, and a secondary transfer voltage is applied to the contact portion between the secondary transfer roller 109 and the counter roller 108. Further, intermediate transfer belt cleaning devices 112 and 113 are disposed so as to be in contact with the intermediate transfer belt 107 after transfer.
In the multicolor image forming apparatus 100 having this configuration, the image holder 101a is rotated in the direction of arrow C, and the surface thereof is charged by the charging device 102a, and then an electrostatic charge image of the 1 st color is formed by the exposure device 114a such as a laser beam. The formed electrostatic charge image is developed (visualized) with a developer containing toner by a developing device 103a containing toner corresponding to the color of the electrostatic charge image, thereby forming a toner image. Further, toners (for example, yellow, magenta, cyan, and black) corresponding to the electrostatic charge images of the respective colors are accommodated in the developing devices 103a to 103d, respectively.
The toner image formed on the image holder 101a is electrostatically transferred (primary transfer) onto the intermediate transfer belt 107 by the primary transfer roller 105a when passing through the primary transfer portion. Thereafter, the toner images of the 1 st color are first transferred onto the intermediate transfer belt 107 by the primary transfer rollers 105b to 105d so that the toner images of the 2 nd, 3 rd and 4 th colors overlap in this order, and finally a multi-color multi-toner image is obtained.
The multiple toner images formed on the intermediate transfer belt 107 are transferred electrostatically to the recording medium 115 as they pass through the secondary transfer section. The recording medium 115 to which the toner image is transferred is conveyed to the fixing device 110, is subjected to fixing treatment by heating and pressurizing or heating or pressurizing, and is then discharged to the outside.
The image holders 101a to 101d after the primary transfer are cleaned of residual toner by the image holder cleaning devices 104a to 104 d. On the other hand, the intermediate transfer belt 107 after the secondary transfer removes residual toner by the intermediate transfer belt cleaning devices 112 and 113, and prepares for the next image forming process.
Image-retaining body
As the image holders 101a to 101d, known electrophotographic photoreceptors can be widely used. As the electrophotographic photoreceptor, an inorganic photoreceptor having a photosensitive layer made of an inorganic material, an organic photoreceptor having a photosensitive layer made of an organic material, or the like can be used. As the organic photoreceptor, a function-separated organic photoreceptor in which a charge generation layer that generates charges by exposure, a charge transport layer that transports charges are stacked, or a single-layer organic photoreceptor that functions to generate charges and transport charges can be used. In addition, in the inorganic photoreceptor, a photosensitive layer having a photosensitive layer made of amorphous silicon may be used.
The shape of the image holding body is not particularly limited, and for example, a known shape such as a cylindrical drum shape, a sheet shape, or a plate shape may be used.
Charging device-
The charging devices 102a to 102d are not particularly limited, and for example, a contact type charger using a roller, brush, film, rubber plate, or the like having conductivity (herein, "conductivity" in the charging device means, for example, volume resistivity of less than 10 7 Ω· cm.) or semi-conductivity (herein, "semi-conductivity" in the charging device means, for example, volume resistivity of 10 7 Ω·cm or more and 10 13 Ω·cm or less); a known charger such as a scorotron charger or a corotron charger using corona discharge is used. Among them, for example, a contact type charger is preferable.
In general, the charging devices 102a to 102d apply direct current to the image holders 101a to 101d, but may further apply alternating current in a superimposed manner.
Exposure apparatus
The exposure devices 114a to 114d are not particularly limited, and may be widely applied to, for example, known exposure devices such as optical system devices capable of exposing the surfaces of the image holders 101a to 101d to light sources such as semiconductor lasers, LED (LIGHT EMITTING Diode) light, or liquid crystal shutter light, or to a set pattern from these light sources via a polygon mirror.
Development device
The developing devices 103a to 103d are selected according to the purpose. For example, a known developer in which a one-component developer or a two-component developer is developed by using a brush, a roller, or the like, in contact or non-contact with each other is used.
Primary transfer roller
The primary transfer rollers 105a to 105d may have any of a single-layer or multi-layer structure. For example, in the case of a single-layer structure, the roller is composed of a silicone rubber, a urethane rubber, EPDM, or the like, which is foamed or unfoamed, and conductive particles such as carbon black are appropriately blended therein.
Image holder cleaning device
The image holder cleaning devices 104a to 104d remove residual toner adhering to the surfaces of the image holders 101a to 101d after the primary transfer step, and use cleaning brushes, cleaning rollers, and the like in addition to the cleaning blades. Among them, for example, a cleaning blade is preferably used. The cleaning blade may be made of urethane rubber, chloroprene rubber, silicone rubber, or the like.
Secondary transfer roller
The layer structure of the secondary transfer roller 109 is not particularly limited, but for example, in the case of a three-layer structure, it is composed of a core layer, an intermediate layer, and a coating layer covering the surface thereof. The core layer is made of a foam such as silicone rubber, urethane rubber, EPDM, or the like in which conductive particles are dispersed, and the intermediate layer is made of a non-foam of these. Examples of the material of the coating layer include tetrafluoroethylene-hexafluoropropylene copolymer and perfluoroalkoxy resin. The volume resistivity of the secondary transfer roller 109 is preferably 10 7 Ω·cm or less, for example. The intermediate layer may be removed by a two-layer structure.
Opposed rollers
The opposing roller 108 forms an opposing electrode of the secondary transfer roller 109. The layer structure of the opposing roller 108 may be any one of a single-layer structure or a multi-layer structure. For example, in the case of a single-layer structure, the roller is composed of a silicone rubber, a urethane rubber, EPDM, or the like, in which conductive particles such as carbon black are appropriately mixed. In the case of the two-layer structure, the elastic layer is formed by a roller having an outer peripheral surface coated with a high-resistance layer.
In general, a voltage of 1kV or more and 6kV or less is applied to the cores of the counter roller 108 and the secondary transfer roller 109. Instead of applying a voltage to the core of the counter roller 108, a voltage may be applied to the electrode member of the electric good conductor and the secondary transfer roller 109 that are in contact with the counter roller 108. Examples of the electrode member include a metal roller, a conductive rubber roller, a conductive brush, a metal plate, and a conductive resin plate.
Fixing device
As the fixing device 110, for example, a known fixing device such as a heat roller fixing device, a pressure roller fixing device, or a flash fixing device can be widely used.
Cleaning device for intermediate transfer belt
The intermediate transfer belt cleaning devices 112 and 113 use cleaning brushes, cleaning rollers, or the like in addition to cleaning blades. Among them, for example, a cleaning blade is preferably used. The cleaning blade may be made of urethane rubber, chloroprene rubber, silicone rubber, or the like.
Next, an image forming apparatus using the endless belt according to the present embodiment as a recording medium transport member (paper transport belt) will be described.
Fig. 2 is a schematic configuration diagram showing another example of the image forming apparatus according to the present embodiment. The image forming apparatus shown in fig. 2 is an image forming apparatus in which the endless belt according to the present embodiment is applied to a recording medium transport body (paper transport belt).
In the image forming apparatus shown in fig. 2, the unit Y, M, C, BK includes photosensitive drums (image holders) 201Y, 201M, 201C, and 201BK, respectively, which rotate clockwise as indicated by the arrow. The chargers 202Y, 202M, 202C, 202BK, the imagers 203Y, 203M, 203C, 203BK, and the respective color developing devices (yellow developing device 204Y, magenta developing device 204M, cyan developing device 204C, black developing device 204 BK) and the photosensitive drum cleaning members 205Y, 205M, 205C, 205BK are disposed around the photosensitive drums 201Y, 201M, 201C, 201BK, respectively.
The units Y, M, C, BK are sequentially arranged in parallel with each other in four units BK, C, M, Y with respect to the sheet conveyor 206, but the order of the units BK, Y, C, M is set to an appropriate order according to the image forming method.
The sheet conveyance belt 206 is supported by belt support rollers 210, 211, 212, 213 while tension is imparted from the inner surface side, and forms an endless belt unit 220. The sheet conveying belt 206 rotates counterclockwise as indicated by the arrow at the same peripheral speed as the photosensitive drums 201Y, 201M, 201C, and 201BK, and a portion thereof located in the middle of the belt supporting rollers 212 and 213 is disposed in contact with the photosensitive drums 201Y, 201M, 201C, and 201BK, respectively. The sheet conveyor belt 206 includes a belt cleaning member 214.
The transfer rollers 207Y, 207M, 207C, 207BK are disposed at positions facing portions of the sheet conveyor belt 206 in contact with the photosensitive drums 201Y, 201M, 201C, 201BK, respectively, inside the sheet conveyor belt 206, and form transfer areas for transferring toner images to the sheets (transfer objects) 216 via the sheet conveyor belt 206 to the photosensitive drums 201Y, 201M, 201C, 201 BK. As shown in fig. 2, the transfer rollers 207Y, 207M, 207C, 207BK may be disposed directly under the photosensitive drums 201Y, 201M, 201C, 201BK, or may be disposed at positions offset from the directly under.
The fixing device 209 is configured to be conveyed after passing through each transfer region between the sheet conveying belt 206 and the photosensitive drums 201Y, 201M, 201C, 201 BK.
The sheet 216 is conveyed to the sheet conveying belt 206 by the sheet conveying roller 208.
In the image forming apparatus shown in fig. 2, in the unit BK, the photosensitive drum 201BK is rotationally driven. In conjunction with this, the charger 202BK drives, and charges the surface of the photosensitive drum 201BK to a target polarity and potential. Then, the photosensitive drum 201BK having the charged surface is exposed to light as a pattern by the exposure device 203BK, and an electrostatic charge image is formed on the surface.
Next, the electrostatic charge image is developed by the black developing device 204 BK. Then, a toner image is formed on the surface of the photoconductive drum 201 BK. The developer in this case may be a single-component developer or a two-component developer.
The toner image passes through a transfer region between the photosensitive drum 201BK and the sheet conveying belt 206, and the sheet 216 is electrostatically attracted to the sheet conveying belt 206 and conveyed to the transfer region, and is sequentially transferred to the surface of the sheet 216 by an electric field formed by a transfer bias applied from the transfer roller 207 BK.
Then, the toner remaining on the photosensitive drum 201BK is cleaned and removed by the photosensitive drum cleaning member 205 BK. Then, the photosensitive drum 201BK is supplied for the next image transfer.
The above image transfer is also performed in units C, M and Y by the above method.
The sheet 216 on which the toner image is transferred by the transfer rollers 207BK, 207C, 207M, and 207Y is further conveyed to a fixing device 209, and is fixed.
As described above, an image to be set as a target is formed on a sheet.
Next, an image forming apparatus using the endless belt according to the present embodiment as a fixing belt (heating belt, pressing belt) will be described.
As an image forming apparatus using the endless belt according to the present embodiment as a fixing belt (heating belt, pressing belt), for example, the same image forming apparatus as that shown in fig. 1 and 2 can be used. In the image forming apparatus shown in fig. 1 and 2, for example, a fixing apparatus using an endless belt according to the present embodiment described later can be applied as the fixing apparatus 110 or 209.
Hereinafter, a fixing device in which the endless belt according to the present embodiment is used as a fixing belt (heating belt, pressing belt) will be described.
Fixing device
As the fixing device, there are various structures including, for example, a1 st rotation body and a2 nd rotation body disposed in contact with an outer surface of the 1 st rotation body.
Hereinafter, as the 1 st and 2 nd modes of the fixing device, a fixing device including a heating belt and a pressure roller will be described.
The fixing device is not limited to the 1 st and 2 nd modes, and may be a fixing device including a heating roller, a heating belt, and a pressing belt. The endless belt according to the present embodiment is applicable to both a heating belt and a pressurizing belt.
The fixing device is not limited to the 1 st and 2 nd modes, and may be an electromagnetic induction heating type fixing device.
Mode 1 of the fixing device
A fixing device according to embodiment 1 will be described. Fig. 3 is a schematic diagram showing an example of the fixing device according to embodiment 1.
As shown in fig. 3, the fixing device 60 according to embodiment 1 is configured to include, for example, a heat roller 61 (an example of a1 st rotating body) that is driven to rotate, a pressing belt 62 (an example of a2 nd rotating body), and a pressing pad 64 (an example of a pressing member) that presses the heat roller 61 via the pressing belt 62.
The pressing pad 64 may be pressed against the heating roller 61 by the pressing belt 62, for example. Accordingly, the pressure belt 62 may be pressed by the heating roller 61, or the heating roller 61 may be pressed by the pressure belt 62.
A halogen lamp 66 (an example of a heating mechanism) is disposed inside the heating roller 61. The heating means is not limited to a halogen lamp, and other heat generating components may be used.
On the other hand, a temperature sensing element 69 is disposed on the surface of the heating roller 61, for example, in contact therewith. The lighting of the halogen lamp 66 is controlled based on the temperature measurement value measured by the temperature sensing element 69, so that the surface temperature of the heating roller 61 is maintained at a target set temperature (for example, 150 ℃).
The pressing belt 62 is rotatably supported by, for example, a pressing pad 64 disposed inside and a belt stroke guide 63. Further, in the nip region N (nip portion), the heating roller 61 is arranged to be pressed by the pressing pad 64.
The pressing pad 64 is disposed, for example, inside the pressing belt 62 in a state of being pressed by the heating roller 61 via the pressing belt 62, and forms a nip region N with the heating roller 61.
The pressing pad 64 is provided with, for example, a front sandwiching member 64a for securing a wide sandwiching region N on the inlet side of the sandwiching region N, and a peeling sandwiching member 64b for imparting deformation to the heating roller 61 on the outlet side of the sandwiching region N.
In order to reduce the sliding resistance between the inner peripheral surface of the pressing belt 62 and the pressing pad 64, for example, a sheet-like sliding member 68 is provided on the surface that contacts the pressing belt 62 of the front sandwiching member 64a and the peeling sandwiching member 64 b. The pressing pad 64 and the slide member 68 are held by a holding member 65 made of metal.
The sliding member 68 is provided, for example, such that its sliding surface contacts the inner peripheral surface of the pressure belt 62 and participates in holding and supplying oil existing between the sliding member and the pressure belt 62.
The holding member 65 is provided with a belt stroke guide 63, for example, and is configured to rotate the pressing belt 62.
The heating roller 61 is rotated in the arrow S direction by a driving motor, not shown, for example, and the pressing belt 62 is rotated in the arrow R direction opposite to the rotation direction of the heating roller 61 by the rotation. That is, for example, the heating roller 61 rotates clockwise in fig. 3, whereas the pressing belt 62 rotates counterclockwise.
The sheet K (an example of a recording medium) having the unfixed toner image is guided by the fixing inlet guide 56, for example, and is conveyed to the nip region N. When the sheet K passes through the nip region N, the toner image on the sheet K is fixed by pressure and heat applied to the nip region N.
In the fixing device 60 according to embodiment 1, for example, a wider nip region N is ensured by the concave front nip member 64a similar to the outer peripheral surface of the heating roller 61, as compared with a configuration without the front nip member 64 a.
In the fixing device 60 according to embodiment 1, for example, the peeling nip member 64b is disposed so as to protrude from the outer peripheral surface of the heating roller 61, whereby the deformation of the heating roller 61 locally increases in the outlet region of the nip region N.
When the peeling nip member 64b is disposed in this manner, for example, when the sheet K after fixing passes through the peeling nip region, the sheet K is likely to peel from the heating roller 61 because the sheet K is deformed to pass through a locally large extent.
As the peeling assisting means, for example, a peeling member 70 is disposed downstream of the nip region N of the heating roller 61. The peeling member 70 is held by the holding member 72 in a state where the peeling claw 71 approaches the heating roller 61 in a direction (reverse direction) opposite to the rotation direction of the heating roller 61, for example.
A fixing device according to a2 nd aspect of the fixing device will be described. Fig. 4 is a schematic diagram showing an example of the fixing device according to embodiment 2.
As shown in fig. 4, the fixing device 80 according to embodiment 2 includes, for example, a fixing belt module 86 including a heating belt 84 (an example of the 1 st rotating body) and a pressing roller 88 (an example of the 2 nd rotating body) arranged to press the heating belt 84 (fixing belt module 86). Further, for example, a nip region N (nip portion) where the heating belt 84 (fixing belt module 86) and the pressing roller 88 are in contact is formed. In the nip region N, the sheet K (an example of a recording medium) is pressurized and heated, and the toner image is fixed.
The fixing belt module 86 includes, for example, an endless heating belt 84, a heating pressing roller 89 that is wound around the heating belt 84 on the pressing roller 88 side and is rotationally driven by a rotational force of a motor (not shown) to push the heating belt 84 from the inner peripheral surface thereof toward the pressing roller 88 side, and a support roller 90 that supports the heating belt 84 from the inside at a position different from the heating pressing roller 89.
The fixing belt module 86 includes, for example, a support roller 92 disposed outside the heating belt 84 and defining a path around the heating belt, an attitude correction roller 94 for correcting the attitude of the heating belt 84 from the heating pressing roller 89 to the support roller 90, and a support roller 98 for applying tension to the heating belt 84 from the inner peripheral surface on the downstream side of the nip region N, which is the region where the heating belt 84 (fixing belt module 86) contacts the pressing roller 88.
The fixing belt module 86 is provided, for example, with a sheet-like slide member 82 interposed between the heating belt 84 and the heating pressing roller 89.
The sliding member 82 is provided, for example, such that its sliding surface contacts the inner peripheral surface of the heating belt 84 and participates in holding and supplying oil existing between the sliding member and the heating belt 84.
Here, the slide member 82 is provided in a state where both ends thereof are supported by the support member 96, for example.
A halogen heater 89A (an example of a heating mechanism) is provided in the heating pressing roller 89, for example.
The backup roller 90 is, for example, a cylindrical roller made of aluminum, and a halogen heater 90A (an example of a heating mechanism) is disposed therein to heat the heating belt 84 from the inner peripheral surface side.
Spring members (not shown) for pressing the heating belt 84 outward are disposed at both ends of the support roller 90, for example.
The backup roller 92 is, for example, a cylindrical roller made of aluminum, and a release layer made of a fluororesin having a thickness of 20 μm is formed on the surface of the backup roller 92.
The release layer of the backup roller 92 is formed, for example, to prevent toner or paper dust from the outer peripheral surface of the heating belt 84 from accumulating on the backup roller 92.
A halogen heater 92A (an example of a heating source) is disposed in the support roller 92, for example, and the heating belt 84 is heated from the outer peripheral surface side.
That is, for example, the heating belt 84 is heated by the heating pressing roller 89, the backup roller 90, and the backup roller 92.
The posture correction roller 94 is, for example, a cylindrical roller made of aluminum, and an end position measuring mechanism (not shown) for measuring the end position of the heating belt 84 is disposed in the vicinity of the posture correction roller 94.
The posture correcting roller 94 is provided with an axial displacement mechanism (not shown) for displacing the contact position of the heating belt 84 in the axial direction based on the measurement result of the end position measuring mechanism, for example, and is configured to control meandering of the heating belt 84.
On the other hand, the pressure roller 88 is rotatably supported, and is provided so as to be pressed by a portion of the heating belt 84 wound around the heating pressing roller 89 by a biasing mechanism such as a spring, not shown. Accordingly, the heating belt 84 (heating pressing roller 89) of the fixing belt module 86 rotates in the arrow S direction, and the pressing roller 88 rotates in the arrow R direction as driven by the heating belt 84 (heating pressing roller 89).
When the sheet K having an unfixed toner image (not shown) is conveyed in the direction of arrow P and guided to the nip region N of the fixing device 80, the sheet K is fixed by pressure and heat applied to the nip region N.
In the fixing device 80 according to claim 2, a halogen heater (halogen lamp) is applied as an example of the heating source, but the invention is not limited thereto, and a radiation lamp heating element (a heating element that emits radiation (infrared rays or the like)) other than the halogen heater, a resistance heating element (a heating element that generates joule heat by passing a current through a resistance, for example, a heating element that forms a film having a resistance on a ceramic substrate and burns the film, and the like) may be applied.
< Annular band Unit >)
The endless belt unit according to the present embodiment includes an endless belt according to the present embodiment and a plurality of rollers for erecting the endless belt in a state where tension is applied.
As the endless belt unit according to the present embodiment, for example, an endless belt unit 107b shown in fig. 1 and an endless belt unit 220 shown in fig. 2 are provided with a cylindrical member and a plurality of rollers for erecting the cylindrical member in a state where tension is applied.
For example, the endless belt unit according to the present embodiment may be an endless belt unit shown in fig. 5.
Fig. 5 is a schematic perspective view showing an endless belt unit according to the present embodiment.
As shown in fig. 5, the endless belt unit 130 according to the present embodiment includes the endless belt 30 according to the present embodiment, and is installed in a state where tension is applied by, for example, a driving roller 131 and a driven roller 132 disposed opposite to the endless belt 30.
Here, in the endless belt unit 130 according to the present embodiment, when the endless belt 30 is used as an intermediate transfer member, a roller for primary transfer of the toner image on the surface of the photoreceptor (image holder) onto the endless belt 30 and a roller for further secondary transfer of the toner image transferred onto the endless belt 30 onto a recording medium may be disposed as the roller for supporting the endless belt 30.
The number of rollers for supporting the endless belt 30 is not limited, and may be arranged according to the manner of use. The endless belt unit 130 having the above-described structure is assembled and used in the apparatus, and the endless belt 30 is rotated while being supported by the rotation of the driving roller 131 and the driven roller 132.
Examples
The following examples are illustrative, but the present invention is not limited to these examples.
Example 1 >
(Preparation of polyimide precursor composition)
200G of tetramethylurea as a urea solvent was added to a flask equipped with a stirrer, a thermometer and a dropping funnel. To this was added 20.20g of p-phenylenediamine as a diamine compound, and stirring was carried out at 20℃for 10 minutes. 21.38g of 3,3', 4' -biphenyltetracarboxylic dianhydride as an aromatic tetracarboxylic dianhydride was added to the solution, and the mixture was stirred and dissolved for 24 hours while maintaining the reaction temperature at 40℃to obtain a polyimide precursor composition containing a polyimide precursor.
(Coating film Forming step and drying step)
The prepared polyimide precursor composition was applied to the outer surface of a cylindrical mold (substrate) made of aluminum, and was spin-dried at 150℃for 30 minutes.
(Calcination step)
Then, the mold was heated for 1 hour while being rotated at 20rpm in an oven at 300℃and then taken out of the oven.
(Removal Process)
The molded article of polyimide resin formed on the outer peripheral surface of the mold was taken out from the mold, and an endless belt having a resin layer with a thickness of 0.08mm was obtained.
Examples 2 to 21 and comparative examples 1 to 5 >, respectively
An endless belt was obtained in the same manner as in example 1 except that the type of the solvent in (production of the polyimide precursor composition) and the temperature and heating time of the oven in (calcination step) were changed to those described in table 1.
Examples 22 to 27 >
A endless belt was obtained in the same manner as in example 4 except that the diamine compound type in (production of polyimide precursor composition) was changed to that described in table 2.
< Evaluation >
The tensile breaking strength and the number of times of folding based on the MIT test of the endless belt obtained in each example according to the steps described above were measured, and the results thereof are shown in table 1. The following references describe a to D in the columns of the number of times of folding based on the MIT test.
Reference-
The ratio (%) of the actual measurement value when the target value (300,000 times) of the number of folds based on the MIT test was set to 100 (actual measurement value of the number of folds based on the MIT test/(target value of the number of folds based on the MIT test) ×100] was calculated, and any one of a to D was described in table 1 based on the value as follows.
AA: ratio of 230% to actual measured value
A: the proportion of the actual measured value is less than 230 percent and is more than or equal to 200 percent
B: the proportion of the actual measured value is less than 200 percent and is more than or equal to 120 percent
C: the proportion of the actual measured value is less than 120 percent and is more than or equal to 100 percent
D: the ratio of the actual measured values is less than 100%
The number of times of bending resistance based on the MIT test was the number of times until the test piece was broken by repeating bending of the long test piece obtained from the endless belt according to the procedure described above. Since the fracture is caused by the occurrence of a fracture in the bending portion, the greater the value of the number of times of bending resistance based on the MIT test, the more suppressed the occurrence of a fracture in the bending portion upon repeated bending is.
TABLE 1
/>
The abbreviations in tables 1 to 2 are as follows.
Solvent species
Urea: urea solvent
Alkoxyamides: amide solvent containing alkoxy
Amide ester: amide solvent containing ester group
From the above results, it is clear that the endless belt of the present embodiment is an endless belt that can suppress occurrence of breakage in the bent portion even in the case of repeated bending.
In addition, a resin film was produced under the production conditions of the endless belts of each example, and the tensile breaking strength and the number of times of folding based on the MIT test were measured, and the same results as those of the endless belts of each example were obtained. From this, it is found that even if the resin film is formed, the occurrence of cracking in the bent portion can be suppressed in the case of repeated bending.
< Resin film >)
(Coating film Forming step and drying step)
The prepared polyimide precursor composition was applied to a glass plate (substrate) by a bar coater, and dried at 150℃for 30 minutes.
(Calcination step)
Next, after the glass plate was heated in the oven, it was taken out of the oven.
(Removal Process)
The polyimide resin film formed on the glass plate was peeled off from the glass plate to obtain a resin film having a thickness of 0.08 mm.
(1) A resin film having a resin layer containing at least one solvent selected from the group consisting of urea-based solvents, amide-based solvents containing an alkoxy group, and amide-based solvents containing an ester group,
The content of the solvent is more than 2200ppm and 10000ppm or less relative to the total amount of the resin layer.
(2) The resin film according to (1), wherein,
The solvent is at least one selected from the group consisting of amide solvents containing an alkoxy group and amide solvents containing an ester group.
(3) The resin film according to (2), wherein,
The amide solvent containing alkoxy is at least one selected from the group consisting of 3-methoxy-N, N-dimethylpropionamide and 3-N-butoxy-N, N-dimethylpropionamide,
The amide solvent containing the ester group is 5-dimethylamino-2-methyl-5-oxo-methyl valerate.
(4) The resin film according to any one of (1) to (3), wherein,
The solvent is 3-methoxy-N, N-dimethyl propionamide.
(5) The resin film according to any one of (1) to (4), wherein,
The resin layer comprises a polyimide resin having structural units derived from phenylenediamine and structural units derived from diaminodiphenyl ether,
In the polyimide resin, the content ratio of the structural unit derived from the phenylenediamine to the structural unit derived from the diaminodiphenyl ether (structural unit derived from the phenylenediamine/structural unit derived from the diaminodiphenyl ether) is 80/20 or more and 99.7/0.3 or less in terms of a molar ratio.
(6) The resin film according to any one of (1) to (5), wherein,
The content of the solvent is 2500ppm to 9000ppm relative to the total amount of the resin layer.
(7) The resin film according to (6), wherein,
The content of the solvent is 6000ppm to 7000ppm relative to the total amount of the resin layer.
(8) The resin film according to any one of (1) to (7), wherein,
The boiling point of the solvent is more than 200 ℃ and less than 280 ℃.
(9) The resin film according to any one of (1) to (8), wherein,
The number of folding-back times based on MIT test using a jig with a radius of curvature R of 2mm was 300,000 or more.
(10) A resin film having a resin layer containing at least one solvent selected from the group consisting of urea-based solvents, amide-based solvents containing an alkoxy group, and amide-based solvents containing an ester group,
The tensile breaking strength is 270N/mm 2 or more.
(11) An endless belt formed of the resin film described in any one of (1) to (10).
(12) An image forming apparatus comprising the endless belt (11).
(13) An image forming apparatus includes:
An image holding body;
A charging device for charging the surface of the image holder;
a static charge image forming device for forming a static charge image on the surface of the charged image holder;
A developing device for developing an electrostatic charge image formed on a surface of the image holding body as a toner image by a developer containing a toner;
a transfer device that transfers the toner image to a recording medium; and
A fixing device for fixing the toner image to the recording medium,
At least one selected from the group consisting of the transfer device and the fixing device has the endless belt (11).
According to the invention as recited in (1), there is provided a resin film which can suppress occurrence of cracking in a bent portion even in the case of repeated bending, as compared with the case where the content of the solvent is 2200ppm or less or more than 10000ppm relative to the total amount of the resin layer in the resin film having the resin layer containing at least one solvent selected from the group consisting of a urea-based solvent, an amide-based solvent containing an alkoxy group, and an amide-based solvent containing an ester group.
According to the invention as recited in (2), (3) or (4), there is provided a resin film which can suppress occurrence of cracking in a bent portion even in the case of repeated bending, as compared with the case where the solvent is a urea-based solvent.
According to the invention as recited in (5), there is provided a resin film which can suppress occurrence of cracking in a bent portion even in the case of repeated bending, compared with the case where the content ratio of the structural unit derived from phenylenediamine and the structural unit derived from diaminodiphenyl ether (the structural unit derived from phenylenediamine/the structural unit derived from diaminodiphenyl ether) in the polyimide resin is less than 80/20 and more than 99.7/0.3 in terms of a molar ratio.
According to the invention as recited in (6), there is provided a resin film which can suppress occurrence of cracking in a bent portion even in the case of repeated bending, as compared with the case where the content of the solvent is less than 2500ppm or exceeds 9000 ppm.
According to the invention as recited in item (7), there is provided a resin film which can suppress occurrence of cracking in the bent portion even in the case of repeated bending, as compared with the case where the solvent content is less than 6000ppm or more than 7000 ppm.
According to the invention as recited in (8), there is provided a resin film which can suppress occurrence of cracking in a bent portion even in the case of repeated bending, as compared with the case where the boiling point of the solvent is less than 200 ℃ or exceeds 280 ℃.
According to the invention as recited in (9), there is provided a resin film which can suppress occurrence of cracks in a bent portion even in the case of repeated bending, as compared with the case where the number of times of bending resistance based on the MIT test using a jig having a radius of curvature R of 2mm is less than 300,000 times.
According to the invention as recited in (10), there is provided a resin film which can suppress occurrence of cracking in a bent portion even in the case of repeated bending, as compared with the case where the tensile breaking strength is less than 270N/mm 2 in a resin film having a resin layer containing at least one solvent selected from the group consisting of a urea-based solvent, an amide-based solvent containing an alkoxy group and an amide-based solvent containing an ester group.
According to the invention as recited in item (11), there is provided an endless belt which is suppressed from being broken in a bent portion even in the case of repeated bending, as compared with the case of an endless belt formed of a resin film having a solvent content of 2200ppm or less or more than 10000ppm relative to the total amount of the resin layer or the case of an endless belt formed of a resin film having a tensile breaking strength of less than 270N/mm 2 in a resin film having a resin layer containing at least one solvent selected from the group consisting of a urea-based solvent, an amide-based solvent containing an alkoxy group and an amide-based solvent containing an ester group.
According to the invention as recited in (12) or (13), there is provided an image forming apparatus comprising an endless belt which is formed of a resin film having a solvent content of 2200ppm or less or more than 10000ppm relative to the total amount of the resin layer or an endless belt formed of a resin film having a tensile breaking strength of less than 270N/mm 2, in comparison with a case where the resin film having a resin layer containing at least one solvent selected from the group consisting of a urea-based solvent, an amide-based solvent having an alkoxy group, and an amide-based solvent having an ester group is provided, the image forming apparatus being capable of suppressing occurrence of breakage in a bent portion even in the case of repeated bending.
The foregoing embodiments of the invention have been presented for purposes of illustration and description. In addition, the embodiments of the present invention are not all inclusive and exhaustive, and do not limit the invention to the disclosed embodiments. It is evident that various modifications and changes will be apparent to those skilled in the art to which the present invention pertains. The embodiments were chosen and described in order to best explain the principles of the invention and its application. Thus, other persons skilled in the art can understand the present invention by various modifications that are assumed to be optimized for the specific use of the various embodiments. The scope of the invention is defined by the following claims and their equivalents.
Claims (13)
1. A resin film having a resin layer containing at least one solvent selected from the group consisting of urea-based solvents, amide-based solvents containing an alkoxy group, and amide-based solvents containing an ester group,
The content of the solvent is more than 2200ppm and 10000ppm or less relative to the total amount of the resin layer.
2. The resin film according to claim 1, wherein,
The solvent is at least one selected from the group consisting of amide solvents containing an alkoxy group and amide solvents containing an ester group.
3. The resin film according to claim 2, wherein,
The amide solvent containing alkoxy is at least one selected from the group consisting of 3-methoxy-N, N-dimethylpropionamide and 3-N-butoxy-N, N-dimethylpropionamide,
The amide solvent containing the ester group is 5-dimethylamino-2-methyl-5-oxo-methyl valerate.
4. The resin film according to any one of claim 1 to 3, wherein,
The solvent is 3-methoxy-N, N-dimethyl propionamide.
5. The resin film according to any one of claim 1 to 4, wherein,
The resin layer comprises a polyimide resin having structural units derived from phenylenediamine and structural units derived from diaminodiphenyl ether,
In the polyimide resin, the content ratio of the structural unit derived from the phenylenediamine to the structural unit derived from the diaminodiphenyl ether (structural unit derived from the phenylenediamine/structural unit derived from the diaminodiphenyl ether) is 80/20 or more and 99.7/0.3 or less in terms of a molar ratio.
6. The resin film according to any one of claims 1 to 5, wherein,
The content of the solvent is 2500ppm to 9000ppm relative to the total amount of the resin layer.
7. The resin film according to claim 6, wherein,
The content of the solvent is 6000ppm to 7000ppm relative to the total amount of the resin layer.
8. The resin film according to any one of claims 1 to 7, wherein,
The boiling point of the solvent is more than 200 ℃ and less than 280 ℃.
9. The resin film according to any one of claims 1 to 8, wherein,
The number of folding-back times based on MIT test using a jig with a radius of curvature R of 2mm was 300,000 or more.
10. A resin film having a resin layer containing at least one solvent selected from the group consisting of urea-based solvents, amide-based solvents containing an alkoxy group, and amide-based solvents containing an ester group,
The tensile breaking strength is 270N/mm 2 or more.
11. An endless belt formed of the resin film according to any one of claims 1 to 10.
12. An image forming apparatus provided with the endless belt according to claim 11.
13. An image forming apparatus includes:
An image holding body;
A charging device for charging the surface of the image holder;
a static charge image forming device for forming a static charge image on the surface of the charged image holder;
A developing device for developing an electrostatic charge image formed on a surface of the image holding body as a toner image by a developer containing a toner;
a transfer device that transfers the toner image to a recording medium; and
A fixing device for fixing the toner image to the recording medium,
At least one selected from the group consisting of the transfer device and the fixing device has the endless belt as claimed in claim 11.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022-186038 | 2022-11-21 | ||
| JP2023-175235 | 2023-10-10 | ||
| JP2023175235A JP2024074770A (en) | 2022-11-21 | 2023-10-10 | Resin film, endless belt, and image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118056861A true CN118056861A (en) | 2024-05-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311543729.9A Pending CN118056861A (en) | 2022-11-21 | 2023-11-20 | Resin film, endless belt, and image forming apparatus |
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| Country | Link |
|---|---|
| CN (1) | CN118056861A (en) |
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2023
- 2023-11-20 CN CN202311543729.9A patent/CN118056861A/en active Pending
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