WO2013141270A1 - エレクトレット性微粒子及びその製造方法 - Google Patents
エレクトレット性微粒子及びその製造方法 Download PDFInfo
- Publication number
- WO2013141270A1 WO2013141270A1 PCT/JP2013/057966 JP2013057966W WO2013141270A1 WO 2013141270 A1 WO2013141270 A1 WO 2013141270A1 JP 2013057966 W JP2013057966 W JP 2013057966W WO 2013141270 A1 WO2013141270 A1 WO 2013141270A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electret
- fine particles
- resin
- core
- fluorine
- Prior art date
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field
- G02F1/166—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
- G02F1/167—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
-
- 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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
-
- 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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
- C08J3/126—Polymer particles coated by polymer, e.g. core shell structures
-
- 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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/28—Treatment by wave energy or particle radiation
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/0009—Materials therefor
- G02F1/0018—Electro-optical materials
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/17—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on variable-absorption elements not provided for in groups G02F1/015 - G02F1/169
- G02F1/172—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on variable-absorption elements not provided for in groups G02F1/015 - G02F1/169 based on a suspension of orientable dipolar particles, e.g. suspended particles displays
-
- 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
- C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
- C08J2333/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C08J2333/10—Homopolymers or copolymers of methacrylic acid esters
- C08J2333/12—Homopolymers or copolymers of methyl methacrylate
-
- 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
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
-
- 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
- C08J2427/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2427/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2427/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08J2427/16—Homopolymers or copolymers of vinylidene fluoride
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field
- G02F1/1675—Constructional details
- G02F2001/1678—Constructional details characterised by the composition or particle type
Definitions
- the present invention relates to electret fine particles useful as electrophoretic particles for use in full-color electrophoretic display devices (so-called electronic paper) and a method for producing the same.
- electrophoretic display method based on electrophoresis of charged particles (electret particles) is considered as the optimum technology for next-generation display devices.
- electrophoretic display method based on electrophoresis of charged particles (electret particles) is considered as the optimum technology for next-generation display devices.
- problems such as the shape of the charged particles, the charged potential ( ⁇ potential) being small and unstable, secondary aggregation and precipitation of the migrating particles, erasure of the previous history display image and insufficient response speed, Research and development is ongoing.
- Patent Documents 1 and 2 disclose electret particles used for the above applications.
- Patent Document 1 states that “a resin serving as an electron trap is added to a core resin of true spherical ultrafine particles having a particle diameter of 1 to 10 ⁇ m produced by polymerizing a polymer fine particle material, and an electron beam of 10 to 300 kGy is added thereto.
- the negatively charged fine particles are characterized in that the core resin is colored in a desired color by the fine particles charged with electret negative charges.
- Patent Document 2 states that “materials for electron traps, pigments, and the like are added to polymer fine particle raw material monomers to form 5 to 10 ⁇ m spherical fine particles by suspension polymerization, emulsion polymerization, dispersion polymerization, etc. These particles were irradiated with an electron beam of 10 to 50 kGy and heated at 90 to 110 ° C. for several tens of minutes, or irradiated with an electron beam of 10 to 50 kGy at 90 to 110 ° C. to form electret negative charges. , Colored negatively charged fine particles having a ⁇ potential of ⁇ 50 to ⁇ 100 mV and colored in a desired color. ”(Claim 10).
- An object of the present invention is to provide electret fine particles exhibiting excellent electrophoretic properties having uniform chargeability and good dispersibility in an electrophoretic medium, and a method for producing the same.
- the present inventor has found that the above object can be achieved according to electret fine particles obtained by electretizing specific fine particles or a core-shell structure. It came to complete.
- the present invention relates to the following electret fine particles and a method for producing the same.
- Electret fine particles wherein the electret fine particles contain an electret resin and a polymer dispersant at least on the surface portion;
- the electret resin is a fluorine-containing resin and is electretized by electron beam irradiation, radiation irradiation or corona discharge.
- Electret fine particles characterized by the above. 2.
- a core-shell type electret fine particle having a core part and a shell part The core portion contains a material capable of dispersing a pigment, and the shell portion contains an electret resin and a polymer dispersant,
- the electret resin is a fluorine-containing resin and is electretized by electron beam irradiation, radiation irradiation or corona discharge.
- the electret fine particles according to item 1. 3. The electret fine particles according to Item 1 or 2, wherein the electret resin is a fluorine-containing resin having a fluorine substitution rate of 10% or more. 4).
- Item 5 The electret fine particles according to any one of Items 2 to 4, wherein the material capable of dispersing the pigment is a resin. 6).
- a core-shell type electret fine particle having a core part and a shell part contains a resin capable of dispersing a pigment and a pigment having an average particle size of 0.02 to 0.2 ⁇ m, and the shell portion contains an electret resin and a polymer dispersant,
- the electret resin is a vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer and electretized by electron beam irradiation, radiation irradiation or corona discharge;
- the electret fine particles have an average particle size of 1000 ⁇ m or less. 2.
- a method for producing electret particulates A method for producing electret fine particles, comprising forming fine particles containing an electret resin and a polymer dispersant at least on a surface portion, and then subjecting the fine particles to electron beam irradiation, radiation irradiation, or corona discharge.
- the manufacturing method according to Item 8 wherein the fine particles are dispersed in an electrophoretic medium and subjected to electron beam irradiation, radiation irradiation, or corona discharge. 10.
- a method for producing core-shell electret fine particles After forming a core-shell structure comprising a core portion containing a material capable of dispersing a pigment and a shell portion containing a fluorine-containing resin that is an electret resin and a polymer dispersant, an electron beam is applied to the core-shell structure.
- Item 9 The method according to Item 8, wherein irradiation, radiation irradiation or corona discharge is performed.
- Item 11 The manufacturing method according to Item 10, wherein the core-shell structure is dispersed in an electrophoretic medium and electron beam irradiation, radiation irradiation, or corona discharge is performed.
- the electret fine particles of the present invention contain an electret resin and a polymer dispersant at least on the surface portion,
- the electret resin is a fluorine-containing resin and is electretized by electron beam irradiation, radiation irradiation, or corona discharge.
- the electret fine particles of the present invention having the above characteristics contain at least a surface-containing fluorine-containing resin and polymer dispersant, and are electretized by electron beam irradiation, radiation irradiation, or corona discharge.
- the electret fine particles exhibiting excellent electrophoretic properties with uniform chargeability of the fine particles and good dispersibility in the electrophoretic medium.
- the portion containing the fluorine-containing resin and the polymer dispersant may be at least the surface portion as long as the effects of chargeability and dispersibility can be obtained, and includes a mode in which the entire electret fine particles contain these components.
- the electret fine particles of the present invention are core-shell type electret fine particles having a core portion and a shell portion,
- the core portion contains a material capable of dispersing a pigment
- the shell portion contains an electret resin and a polymer dispersant
- the electret resin is a fluorine-containing resin and includes an embodiment in which the electret resin is electretized by electron beam irradiation, radiation irradiation, or corona discharge.
- the electret fine particles of the present invention having the above characteristics are useful as electrophoretic particles for use in a full-color electrophoretic display device because a pigment can be dispersed in the core portion.
- the shell part contains a fluorine-containing resin which is an electret resin and a polymer dispersant, and is electretized by electron beam irradiation, radiation irradiation or corona discharge, so that the chargeability of the fine particles is uniform and It is electret fine particles having good dispersibility in an electrophoretic medium and exhibiting excellent electrophoretic properties.
- the portion containing the fluorine-containing resin and the polymer dispersant is at least a surface portion as long as the effect of chargeability and dispersibility can be obtained. It is sufficient that the electret fine particles as a whole contain these components.
- a mode in which the electret fine particles are divided into a surface portion and an inner portion inside thereof is the core-shell type electret fine particles of the present invention.
- the core portion contains a material capable of dispersing a pigment.
- the material in which the pigment can be dispersed is not limited, but a fluorine-containing compound is preferable from the viewpoint of dispersing the pigment and imparting electret properties to the core portion as well as the shell portion.
- a fluorine-containing compound for example, known fluorine-containing resins, fluorine-containing oils, fluorine-containing adhesives and the like can be widely used.
- fluorine-containing resin examples include tetrafluoroethylene resin, linear fluoropolyether compound, ethylene tetrafluoride / vinyl monomer copolymer, and polymerizable amorphous fluororesin.
- PTFE polytetrafluoroethylene
- linear fluoropolyether compounds include (trade names “SIFEL3590-N”, “SIFEL2610”, and “SIFEL8470” manufactured by Shin-Etsu Chemical Co., Ltd.).
- ethylene tetrafluoride / vinyl monomer copolymer examples include (trade name “Zeffle” manufactured by Daikin Industries, Ltd.).
- polymerizable amorphous fluororesin examples include (trade name “CYTOP” manufactured by Asahi Glass).
- fluorine-containing oil examples include perfluoropolyether oil and low polymer trifluoroethylene chloride. Specific examples include perfluoropolyether oil (trade name “DEMNUM” manufactured by Daikin Industries), ethylene trifluoride chloride low polymer (trade name “DAIFLOY” manufactured by Daikin Industries), and the like.
- fluorine-containing adhesive examples include an ultraviolet curable fluorinated epoxy adhesive. Specific examples include (trade name “Optodyne” manufactured by Daikin Industries).
- a resin is preferable as the material capable of dispersing the pigment.
- a known resin other than the fluorine-containing resin can be used as a material capable of dispersing the pigment.
- acrylic resin, polystyrene resin, polyurethane resin and the like are preferable.
- acrylic resin spheres (trade name “TAFTIC series” manufactured by Toyobo), (trade name “ Art pearl GR series “Negami Kogyo”, (trade name “Kemisnow MX series” manufactured by Soken Chemical), (trade name “Love Color series” manufactured by Dainichi Seikagyo), (trade name “Technopolymer MB series” Sekisui Chemical Co., Ltd.) Manufactured) and the like.
- Examples of the polystyrene resin sphere include (trade name “Technopolymer SBX series” manufactured by Sekisui Chemical Co., Ltd.), (trade name “Chemisnow SX series” manufactured by Soken Chemical), and the like.
- Examples of the polyurethane resin sphere include (trade name “Art Pearl C Series” manufactured by Negami Kogyo Co., Ltd.).
- acrylic resin balls (trade name “Art Pearl GR series” manufactured by Negami Kogyo) and polyurethane resin balls (trade name “Art Pearl C series” manufactured by Negami Kogyo) are particularly preferable.
- the pigment to be dispersed in the core portion is not limited, and a known pigment can be used. By dispersing the pigment in the core part, finally electret fine particles are obtained, which is useful as a full-color electronic paper material.
- inorganic pigments include, but are not limited to, carbon black, oil smoke, bone black, vegetable black, and the like as black pigments mainly composed of carbon.
- white pigments include titanium oxide, zinc oxide, calcium carbonate, barium sulfate, and silicon oxide. These white pigments can be used as appropriate for the production of white migrating particles and particle specific gravity adjustment.
- organic pigment examples include, but are not limited to, ⁇ -naphthol type, naphthol AS type, acetoacetic acid, arylamide type, pyrazolone type, acetoacetic acid arylamide type, pyrazolone type, ⁇ -naphthol type, ⁇ -oxynaphthoic acid type ( BON acid type), naphthol AS type, acetoacetyl allylide type azo pigments.
- phthalocyanine anthraquinone (slen), perylene, perinone, indigo, thioindigo, quinacridone, dioxazine, isoindolinone, quinophthalone, metal complex pigment, methine, azomethine, diketo
- polycyclic pigments such as pyrrolopyrrole.
- Other examples include azine pigments, daylight fluorescent pigments (dye resin solid solutions), hollow resin pigments, nitroso pigments, nitro pigments, and natural pigments.
- Specific commercial products include Symuler® fast® yellow® 4GO, Fastogen® super® magenta® RG, Fastogen® blue® TGR manufactured by DIC Corporation, Fuji® fast® red® 7R3300E, Fuji® fast® carmine® 527 manufactured by Fuji Dye Co., Ltd., and the like.
- the average particle size of these pigments is preferably 20 ⁇ m or less, and more preferably 3 ⁇ m or less. Among these, particularly when the average particle diameter of the pigment is in the range of 0.02 to 0.2 ⁇ m, the electret fine particles obtained are easily transparently colored.
- the lower limit of the average particle diameter of the pigment can be about 0.02 ⁇ m, but a pigment having a smaller average particle diameter can be used depending on the type of pigment.
- the average particle size in the present specification is obtained by diluting the dispersion of the measurement object with a suitable dispersion medium having good compatibility, and using a dynamic light scattering particle size distribution analyzer “LB-550” (manufactured by Horiba, Ltd.). ) To determine the median diameter.
- the core portion may be composed of two components, a material capable of dispersing the pigment and a pigment, and may contain a known additive such as a dispersant and a stabilizer as necessary.
- the amount of the pigment contained in the core portion is not limited, but is preferably about 1 to 30% by weight, more preferably about 5 to 20% by weight.
- the core part may be composed of a single spherical particle or may be composed of an aggregate of a plurality of spherical particles. That is, the core-shell type electret fine particles may have a mode in which the shell portion is coated on the surface of the core portion made of a single spherical particle, and the shell portion is coated around the core portion which is an aggregate of a plurality of spherical particles. It may be a mode that is.
- the shape of the particles constituting the core portion may be not only spherical but also non-spherical such as a polygon.
- the shell portion contains a fluorine-containing resin that is an electret resin and a polymer dispersant.
- electret fine particles having uniform chargeability and excellent electrophoretic properties can be obtained by electretizing the electret resin of the shell portion by electron beam irradiation, radiation irradiation or corona discharge described later. Further, by using a polymer dispersant in combination with the electret resin, electret fine particles excellent not only in chargeability but also in dispersibility in the electrophoresis medium can be obtained.
- a fluorine-containing resin is used in order to obtain electret by electron beam irradiation, radiation irradiation or corona discharge to obtain uniform and excellent chargeability.
- fluorine-containing resin for example, polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), perfluoropolyether (PFPE), etc. are used alone. Alternatively, they can be used in combination, and these copolymers can also be used.
- PTFE polytetrafluoroethylene
- PCTFE polychlorotrifluoroethylene
- PVDF polyvinylidene fluoride
- PVDF polyvinyl fluoride
- PFPE perfluoropolyether
- the PTFE is represented by the following structural formula.
- the fluorine substitution rate of PTFE is 100% when the fluorine substitution rate is calculated on the basis of the structure of the hydrocarbon before fluorine substitution — (CH 2 —CH 2) n —.
- the fluorine substitution rate in this specification is the structure before fluorine substitution: — (CH 2 —CH 2) n—, — (CH 2 —CH 2 —CH 2 —O) n— or — (CH 2 —CH (CH 3)) n—
- the ratio of the number of fluorine substitutions relative to the number of hydrogen atoms bonded to carbon in is a value calculated by the following formula.
- Fluorine substitution rate (%) ⁇ (number of fluorine substituted for hydrogen) / (number of hydrogen bonded to carbon atom in hydrocarbon structure before fluorine substitution) ⁇ ⁇ 100
- PTFE include (trade name “Polyflon PTFE” manufactured by Daikin Industries) and (trade name “Teflon (registered trademark) PTFE” manufactured by Mitsui / DuPont Fluorochemical).
- the PCTFE is represented by the following structural formula.
- the fluorine substitution rate of PCTFE is 75% when calculated from the above formula.
- PCTFE examples include (trade name “Neofluon PCTFE” manufactured by Daikin Industries).
- the PVDF is represented by the following structural formula.
- the fluorine substitution rate of PVDF is 50% when calculated from the above formula.
- PVDF examples include (trade name “KF Polymer” manufactured by Kureha), (trade name “Neofuron PVDF” manufactured by Daikin Industries, Ltd.), and the like.
- the PVF is represented by the following structural formula.
- the fluorine substitution rate of PVF is 25% when calculated from the above formula.
- PVF examples include (trade name “Tedlar” Solvay Solexis, manufactured by Sakai Inc.).
- the PFPE is represented by the following structural formula.
- Fluorine substitution rate of PFPE is 100% when calculated from the above formula.
- PFPE examples include (trade name “DEMNUM” manufactured by Daikin Industries).
- copolymer containing any of these fluorine-containing resins as a copolymer component examples include, for example, tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP). ), Tetrafluoroethylene-ethylene copolymer (ETFE), chlorotrifluoroethylene-ethylene copolymer (ECTFE), vinylidene fluoride-tetrafluoroethylene copolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene Examples include terpolymers. Among these copolymers, a vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer is more preferable in that uniform and excellent chargeability can be obtained.
- Rf represents an alkyl group
- m and n each represents a copolymerization ratio of each unit.
- PFA examples include (trade name “Teflon (registered trademark) PFA” manufactured by Mitsui & DuPont Fluorochemical), (trade name “Neofuron PFA” manufactured by Daikin Industries), and (trade name “Full-on PFA” manufactured by Asahi Glass). It is done.
- the FEP is represented by the following structural formula.
- FEP for example, (trade name “Neofluon FEP” manufactured by Daikin Industries), (trade name “Teflon (registered trademark) FEP” manufactured by Mitsui / Dupont Fluorochemical), (trade name “Dyneon FEP” manufactured by Sumitomo 3M), etc. Can be mentioned.
- m and n show the copolymerization ratio of each unit, respectively.
- the fluorine substitution rate of the tetrafluoroethylene unit is 100% and the fluorine substitution rate of the ethylene unit is 0%
- the fluorine substitution rate of ETFE varies depending on the copolymerization ratios m and n.
- ETFE examples include (trade name “Fullon ETFE” manufactured by Asahi Glass), (trade name “Neofluon ETFE” manufactured by Daikin Industries), and (trade name “Dionion ETFE” manufactured by Sumitomo 3M).
- the above ECTFE is represented by the following structural formula.
- m and n show the copolymerization ratio of each unit, respectively.
- the fluorine substitution rate of the chlorotrifluoroethylene unit is 75% and the fluorine substitution rate of the ethylene unit is 0%
- the fluorine substitution rate of ECTFE varies depending on the copolymerization ratios m and n.
- ECTFE examples include (trade name “Halar” manufactured by Solvay Solexis, Inc.).
- the vinylidene fluoride-tetrafluoroethylene copolymer is a copolymer of the vinylidene fluoride unit (fluorine substitution rate 50%) and the tetrafluoroethylene unit (fluorine substitution rate 100%). Depending on this, the fluorine substitution rate of the vinylidene fluoride-tetrafluoroethylene copolymer varies.
- the vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer comprises the vinylidene fluoride unit (fluorine substitution rate 50%), the hexafluoropropylene unit (fluorine substitution rate 100%) and the tetrafluoroethylene unit (
- the fluorine substitution rate of the ternary copolymer changes depending on the copolymerization ratio.
- Examples of the vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer include (trade name “VT470” manufactured by Daikin Industries, Ltd.).
- the fluorine substitution rate of the above-mentioned fluorine-containing resins is preferably 10% or more, more preferably 20% or more, and most preferably 25 to 100%.
- the content of the electret resin in the electret fine particles is not limited, but is preferably 10 to 50 parts by weight, and preferably 20 to 30 parts by weight in consideration of the balance between the electrification fine particles chargeability and dispersibility. Is more preferable.
- polymer dispersants basically correspond to surfactants having a molecular weight of 10,000 or more, and are the same as so-called polymer surfactants and polymer emulsifiers (see: New Edition Polymer Dictionary (Polymer). (Academic Society), Asakura Shoten, first published on November 25, 1988).
- the polymer dispersant for example, it is preferable to use at least one selected from the group consisting of an acrylic dispersant, a urethane dispersant, a silicone dispersant, and a polyaminoamide dispersant.
- the electret resin fluorine-containing resin alone can exhibit water and oil repellency and effectively suppress aggregation even in an electrophoretic medium that easily aggregates, thereby improving dispersibility. it can.
- acrylic dispersant examples include, for example, the Jonkrill series (trade names “Jonkrill-67, 586, 611, 678, 680, 682, 683, 690: manufactured by BASF Corporation), and the high loss series (trade name“ High Loss X- ”). 1, YS-1274, VS-1047, 1063, 1191, 1193: Seiko PMC, DISPERBYK series (trade names “DISPERBYK-116, 2000, 2001, 2008, 2009, 2020, 2022, 2025, 2050, 2070): BYK)).
- urethane dispersants examples include DISPERBYK series (trade names “DISPERBYK-2163, 2164, 182, 2155, 184, 160: manufactured by BYK”), SOLPERSE series (trade names “SOLPERSE-76500, 55000: manufactured by Lubrizol)”. Etc.
- silicone dispersant examples include BYK series (trade names “BYK-300, 301, 302, 310, 315, 370, 378, 3550: manufactured by BYK”).
- polyaminoamide dispersant examples include ANTITERARA-U series (trade names “ANTITERARA-U, U100, 204, 205: manufactured by BYK”), and trade names “DISPERBYK-101 (manufactured by BYK)”.
- the content of the polymer dispersant in the electret fine particles is not limited, but is preferably 0.5 to 20 parts by weight in consideration of the balance between the chargeability and dispersibility of the electret fine particles. 10 parts by weight is more preferable.
- the shell portion may be composed of only an electret resin and a polymer dispersant, and may contain a known additive such as a pigment derivative or a stabilizer, if necessary.
- the thickness of the shell portion is not limited, but it is preferable that the thickness is uniform from the viewpoint of obtaining uniform chargeability.
- the average particle diameter of the electret fine particles combined with the core portion and the shell portion is preferably 1000 ⁇ m or less, and more preferably 0.02 to 1000 ⁇ m.
- the weight ratio of the core part to the shell part is not limited, but the weight ratio of the core part: shell part is preferably 50:50 to 90:10, more preferably 70:30 to 80:20. .
- the average particle diameter of the electret fine particles composed of a single component described at the beginning is preferably 1000 ⁇ m or less, and preferably 0.02 to 1000 ⁇ m, as in the case of the core-shell electret fine particles.
- the electret fine particles of the present invention are electretized by electron beam irradiation, radiation irradiation or corona discharge.
- electretization by electron beam irradiation, radiation irradiation or corona discharge it is possible to obtain electret fine particles that are trapped in a fluorine-containing resin that is an electret resin and are semi-permanently negatively charged.
- the conditions for electretization will be described later in the description of the manufacturing method.
- the method for producing the electret fine particles is not limited, but in the present invention, after forming fine particles containing an electret resin and a polymer dispersant at least on the surface portion, an electron beam is applied to the fine particles.
- the electret fine particles can be suitably produced by irradiation, radiation irradiation or corona discharge.
- a core shell comprising a core portion containing a material capable of dispersing a pigment, and a shell portion containing a fluorine-containing resin that is an electret resin and a polymer dispersant.
- electret fine particles can be suitably produced by irradiating the core-shell structure with an electron beam, radiation, or corona discharge.
- the production method will be described using a production method of core-shell electret fine particles (referred to as the production method of the present invention) as a representative example.
- the description of the core portion and the shell portion is the same as described above.
- the method for forming the core-shell structure is not limited.
- the core-shell structure can be formed by utilizing known core-shell polymerization.
- Step 1 of obtaining a pigment dispersion by stirring a pigment dispersible material and the pigment
- Step 2 of adding and stirring an electret resin and a polymer dispersant to the pigment dispersion
- Step 3 of adding and stirring a curing agent or a polymerization initiator to the mixed solution
- Step 4 of forming the core-shell structure by adding and stirring the solution of (3) to the water phase in which the emulsifier has been added and stirred.
- a known mixer such as a mixer, a homogenizer, or a dissolver can be used for stirring.
- the core shell structure is cured and polymerized by heating and stirring in step 4, and the reaction is controlled so that curing and polymerization are not initiated in the previous steps.
- the pigment can be made fine by using a ball mill or a bead mill.
- it is preferable to adjust so that the average particle diameter of electret fine particles may be 1000 micrometers or less by adjusting stirring conditions.
- the emulsifier is not limited, and examples thereof include polyvinyl alcohol and ethylene maleic anhydride.
- a colored or non-colored resin sphere (acrylic resin sphere, polystyrene resin sphere, polyurethane resin sphere, etc.) is prepared in advance, and the resin sphere is used as a core part, and the surface contains a fluorine-containing resin and a polymer dispersant
- the electret fine particles can also be produced by covering the portion.
- the obtained core-shell structure is in a suspended state or in the form of powder once taken out of the core-shell structure, or in the state where the powder is dispersed in an electrophoresis medium, and is irradiated with electron beam, radiation, or corona. It can be discharged and electretized. This is the same even when producing electret fine particles composed of a single component.
- Electron beam irradiation, radiation irradiation or corona discharge conditions are not limited as long as the core-shell structure can be electretized.
- an electron beam of about 10 to 50 kGy may be irradiated using an electron beam accelerator.
- gamma rays of about 1 to 15 kGy may be irradiated.
- the electrophoretic medium is not limited, and liquid media including air can be used.
- the liquid medium include ethylene glycol (EG), propylene glycol (PG), glycerin, silicone oil, fluorine oil, petroleum oil, and the like.
- the silicone oil include dimethyl silicone oil.
- perfluoropolyether oil etc. are mentioned as said fluorine-type oil.
- the electret fine particles are disposed between electrode plates, and exhibit electrophoresis by applying an external voltage between the electrode plates.
- the electrophoretic medium is not limited, and a liquid medium including air can be used.
- the liquid medium include ethylene glycol (EG), propylene glycol (PG), glycerin, silicone oil, fluorine oil, petroleum oil, and the like.
- the silicone oil include dimethyl silicone oil.
- examples of the fluorine-based oil include perfluoropolyether oil.
- silicone oil is particularly preferable.
- the electret fine particles also exhibit good dispersibility in these media.
- the electret fine particles are colored (preferably transparently colored) with a pigment.
- An electrophoretic display device that displays a color image using such colored electret fine particles as charged particles for example, A plurality of display units having at least three layers of cells containing charged particles and arranged in a matrix to display each pixel; A first electrode provided on the upper or lower surface of each cell; A second electrode provided at a side end of each cell, An electrophoretic display device in which the charged particles are colored in different colors for each cell in each display unit is preferable.
- each display unit is provided for each pixel, and each display unit includes at least three layers of cells. Since each cell contains charged particles colored in different colors, it is possible to display various colors in one pixel by applying a voltage to the first and second electrodes. A color image can be displayed without useless pixels in the image range.
- the “color different for each cell” is not particularly limited, but in order to realize full color display by additive color mixing without using a color filter, red (R), green (G) and blue (B) is preferred.
- the “cell side edge” means the upper surface edge, the lower surface edge, and the side surface of the cell.
- the electrophoretic display device 1 includes a plurality of display units 2, and the display unit 2 includes first to third cells 5a to 5c.
- the electrode 3 and the second electrode 4 are provided.
- Each display unit 2 is provided for each pixel constituting an image, and includes first to third cells 5a to 5c stacked in the height direction as shown in FIG.
- the first to third cells 5a to 5c are made of a transparent material such as glass or polyethylene terephthalate so that light can be transmitted, and the first electrode 3 and the second electrode are formed on the lower surface.
- a base 7 for supporting the electrode 4 is provided. Note that a reflection plate for reflecting the light transmitted through the display unit 2 and a white plate or a black plate as a background color of the image may be provided below the third cell 5c.
- first to third charged particles 6a to 6c which will be described later, are accumulated on the second electrode 4 at the peripheral edge of the upper surface of the first cell 5a. Shielding means may be provided so that it can be shielded.
- a first electrode 3 and a second electrode for collecting first to third charged particles 6a to 6c described later are collected. 4 is provided.
- the second electrode 4 is disposed over the entire inner surface of each of the first to third cells 5a to 5c.
- the first electrode 3 is disposed on the bottom surface of the first to third cells 5a to 5c so as not to be short-circuited with the second electrode 4 inside the second electrode 4.
- the first electrode 3 can have various shapes such as a plate shape, a stripe shape, a lattice shape, and a dot shape.
- the first electrode 3 and the second electrode 4 are not particularly limited.
- a highly conductive metal such as copper or silver, a transparent conductive resin, an ITO (indium tin oxide) film, or the like. Can be used.
- the charged particles 6b and the third cells 5c contain third charged particles 6c colored blue (B).
- the first to third cells 5a to 5c are filled with an electrophoretic medium for causing the first to third charged particles 6a to 6c to be electrophoresed.
- the operation of the electrophoretic display device 1 will be described with reference to FIGS.
- the first to third cells 5a to 5c are collectively indicated as a cell 5, and the first to third charged particles are generally indicated as a charged particle 6.
- the first electrode 3 is disposed in the first cell 5 a in which the first charged particles 6 a colored red (R) are accommodated.
- R red
- the first charged particles 6a are attracted to the first electrode 3, 1 is arranged on the bottom surface of the cell 5a (FIG. 2A).
- the second and third cells 5a and 5b voltage is applied to the first electrode 3 and the second electrode 4 so that the first electrode 3 becomes a negative electrode and the second electrode 4 becomes a positive electrode.
- the second and third charged particles 6b, 6c are attracted to the second electrode 4 and arranged on the inner side surfaces of the second and third cells 5a, 5b.
- FIG. 2B When the display unit 2 is confirmed from above in this state, only the color (red) of the first charged particle 6a is visually recognized, and the color (green) of the second charged particle 6b and the third Since the color (blue) of the charged particle 6c is hidden behind the second and third cells 5b, 5c, the second electrode 4 or the shielding means and cannot be seen, red is displayed on the pixel (FIG. 3 ( a)).
- the second electrode 5b is placed on the bottom surface of the second cell 5b with the first electrode 3 as the positive electrode and the second electrode 4 as the negative electrode in the second cell 5b.
- the first electrode 3 is used as a negative electrode
- the second electrode 4 is used as a positive electrode
- the first and third charged particles 6a are moved (FIG. 2A).
- 6c are moved to the inner surfaces of the first and third cells 5a, 5c (FIG. 2B).
- the first electrode 3 is used as a positive electrode and the second electrode 4 is used as a negative electrode in the third cell 5c, and the third charged particle 6c is used as the bottom surface of the third cell 5c.
- the first and second charged particles 6a with the first electrode 3 as the negative electrode and the second electrode 4 as the positive electrode. , 6b are moved to the inner surfaces of the first and second cells 5a, 5b (FIG. 2B).
- the magnitude of the voltage applied to the first electrode 3 and the second electrode 4 is adjusted in the first to third cells 5a to 5c, and the first to third cells 5a to 5c are adjusted.
- 3 charged particles 6a to 6c are dispersed (FIG. 3D).
- each display unit 2 corresponding to each pixel has a configuration in which the first to third cells 5a to 5c are stacked, and the first to third cells 5a.
- Various colors can be displayed by one pixel by moving the first to third charged particles 6a to 6c in .about.5c. Therefore, there is no useless pixel that does not contribute to image display in the image range, and as a result, a full color image can be displayed without using a color filter.
- the electret fine particles of the present invention contain at least a fluorine-containing resin whose surface portion is an electret resin and a polymer dispersant and are electretized by electron beam irradiation, radiation irradiation, or corona discharge.
- the electret fine particles exhibiting excellent electrophoretic properties with uniform chargeability and good dispersibility in the electrophoretic medium.
- core-shell electret fine particles are useful as electrophoretic particles for use in full-color electrophoretic display devices because pigments can be dispersed in the core portion.
- the shell part contains a fluorine-containing resin which is an electret resin and a polymer dispersant, and is electretized by electron beam irradiation, radiation irradiation or corona discharge, so that the chargeability of the fine particles is uniform and This is electret fine particles having good dispersibility in an electrophoretic medium and exhibiting excellent electrophoretic properties.
- a fluorine-containing resin which is an electret resin and a polymer dispersant, and is electretized by electron beam irradiation, radiation irradiation or corona discharge, so that the chargeability of the fine particles is uniform and This is electret fine particles having good dispersibility in an electrophoretic medium and exhibiting excellent electrophoretic properties.
- FIG. 2 is a top view and a side sectional view of an electrophoresis test apparatus used in Examples and Comparative Examples.
- Examples 1 to 5 and Comparative Examples 1 to 5 The following were prepared as raw materials for electret fine particles.
- the detailed composition is shown in Table 1.
- B. Dispersibility improving resin ( polymer dispersing agent, 3 types shown in Table 1)
- Acrylic resin balls PVA224 (Emulsifier raw material) Electret fine particles were prepared by the following procedure.
- Fluorine resin VT470 was dissolved in ethyl acetate at 5%, and dispersibility improving resin was dissolved at 2% in ethyl acetate. C and D resin balls were mixed and stirred in this solution.
- Emulsifier was prepared by dissolving 5% of PVA224 in ion exchange water. 200 g of the resin sphere mixture was weighed and stirred with a homomixer at 2000 rpm. The emulsifier 50g was added to the liquid mixture under stirring, and it emulsified by stirring for 6 minutes at 6000 rpm with a homomixer. The emulsion was stirred with a propeller in a warm bath at 50 to 80 ° C. The stirring condition was 600 rpm for 3 hours.
- the slurry after stirring was diluted with ion exchange water, solid-liquid separated with a centrifuge, and washing of the precipitate was repeated four times.
- the washed precipitate was dried in a constant temperature bath at 50 ° C. and then pulverized to obtain electret fine particles.
- Test Example 1 (Electrophoresis test) The electret fine particles obtained in Examples 1 to 5 and Comparative Examples 1 to 3 were subjected to an electrophoresis test using the electrophoresis test apparatus shown in FIG. Specifically, it is as follows.
- ITO film-formed glass (length 300 mm x width 400 mm x thickness 0.7 mm, 7 ⁇ / sq or less) manufactured by Kuramoto Seisakusho Co., Ltd. was cut into 30 mm x 50 mm.
- the adhesive double-sided tape (Scotch super strong double-sided tape, width 19mm x length 4m x thickness 1mm) made by Sumitomo 3M Co., Ltd. was cut 20mm in length, and the center part was pierced 8mm.
- the cut adhesive double-sided tape was pasted slightly to the left of the ITO film-forming glass surface.
- the release paper on the non-adhesive surface of the adhesive double-sided tape was peeled off, and the cut ITO film-forming glass surface was attached so as to cover the non-adhesive surface.
- the upper and lower glass positions were shifted as shown in the side view of FIG. There is a thickness (1mm) of adhesive double-sided tape between the ITO film formation surfaces.
- a syringe (manufactured by Nipro Corporation) containing silicone oil (manufactured by Shin-Etsu Silicone Co., Ltd.) was stabbed into the adhesive double-sided tape between the two glasses, and the double-sided tape that had been cut through was filled with silicone oil.
- the electrophoretic properties of electret fine particles were examined by connecting the upper and lower ends of ITO film with the alligator clips and applying voltage with an external power supply (high voltage power supply manufactured by Matsusada Precision Co., Ltd., HJPM-5R0.6). .
- Test example 2 (dispersibility test) The electret fine particles obtained in Examples 1 to 5 and Comparative Examples 1 to 3 were subjected to a dispersibility test. Specifically, it is as follows.
- silicone oil KF96-1CS manufactured by Shin-Etsu Chemical Co., Ltd.
- Isopar G manufactured by ExxonMobil Chemical
- Electrophoretic display device Display unit 3. First electrode 4. Second electrodes 5a-5c. First to third cells 6a to 6c. 1st to 3rd charged particles
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Nonlinear Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Medicinal Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Crystallography & Structural Chemistry (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
Description
1.エレクトレット性微粒子であって、当該エレクトレット性微粒子は少なくとも表面部分にエレクトレット性樹脂及び高分子分散剤を含有し、
前記エレクトレット性樹脂は、フッ素含有樹脂であり、且つ、電子線照射、放射線照射又はコロナ放電によりエレクトレット化されている、
ことを特徴とするエレクトレット性微粒子。
2.コア部分とシェル部分を有するコアシェル型のエレクトレット性微粒子であって、
前記コア部分は、顔料を分散可能な材料を含有し、前記シェル部分は、エレクトレット性樹脂及び高分子分散剤を含有し、
前記エレクトレット性樹脂は、フッ素含有樹脂であり、且つ、電子線照射、放射線照射又はコロナ放電によりエレクトレット化されている、
上記項1に記載のエレクトレット性微粒子。
3.前記エレクトレット性樹脂は、フッ素置換率が10%以上のフッ素含有樹脂である、上記項1又は2に記載のエレクトレット性微粒子。
4.前記エレクトレット性樹脂がビニリデンフルオライド-ヘキサフルオロプロピレン-テトラフルオロエチレン三元共重合体である、上記項1~3のいずれかに記載のエレクトレット性微粒子。
5.前記顔料を分散可能な材料が樹脂である、上記項2~4のいずれかに記載のエレクトレット性微粒子。
6.前記エレクトレット性微粒子の平均粒子径が1000μm以下である、上記項1~5のいずれかに記載のエレクトレット性微粒子。
7.コア部分とシェル部分を有するコアシェル型のエレクトレット性微粒子であって、
前記コア部分は、顔料を分散可能な樹脂及び平均粒子径が0.02~0.2μmの顔料を含有し、前記シェル部分は、エレクトレット性樹脂及び高分子分散剤を含有し、
前記エレクトレット性樹脂がビニリデンフルオライド-ヘキサフルオロプロピレン-テトラフルオロエチレン三元共重合体であり、且つ、電子線照射、放射線照射又はコロナ放電によりエレクトレット化されており、
前記エレクトレット性微粒子の平均粒子径が1000μm以下である、
上記項1に記載のエレクトレット性微粒子。
8.エレクトレット性微粒子の製造方法であって、
少なくとも表面部分にエレクトレット性樹脂及び高分子分散剤を含有する微粒子を形成した後、当該微粒子に電子線照射、放射線照射又はコロナ放電することを特徴とするエレクトレット性微粒子の製造方法。
9.前記微粒子を電気泳動媒体に分散させて電子線照射、放射線照射又はコロナ放電する、上記項8に記載の製造方法。
10.コアシェル型のエレクトレット性微粒子の製造方法であって、
顔料を分散可能な材料を含有するコア部分と、エレクトレット性樹脂であるフッ素含有樹脂及び高分子分散剤を含有するシェル部分と、からなるコアシェル構造体を形成した後、当該コアシェル構造体に電子線照射、放射線照射又はコロナ放電する、上記項8に記載の製造方法。
11.前記コアシェル構造体を電気泳動媒体に分散させて電子線照射、放射線照射又はコロナ放電する、上記項10に記載の製造方法。
前記エレクトレット性樹脂は、フッ素含有樹脂であり、且つ、電子線照射、放射線照射又はコロナ放電によりエレクトレット化されていることを特徴とする。
前記コア部分は、顔料を分散可能な材料を含有し、前記シェル部分は、エレクトレット性樹脂及び高分子分散剤を含有し、
前記エレクトレット性樹脂は、フッ素含有樹脂であり、且つ、電子線照射、放射線照射又はコロナ放電によりエレクトレット化されている態様も含む。
算出すると、PTFEのフッ素置換率は100%である。なお、本明細書におけるフッ素置換率は、フッ素置換前の構造:-(CH2-CH2)n-、-(CH2-CH2-CH2-O)n-又は-(CH2-CH(CH3))n-における炭素と結合している水素の数に対するフッ素置換数の割合を示す
ものであり、下記式により算出される値である。
・フッ素置換率(%)={(水素と置換したフッ素の数)÷(フッ素置換前の炭化水素の構造において炭素原子に結合している水素の数)}×100
PTFEとしては、例えば、(商品名「ポリフロンPTFE」ダイキン工業製)、(商品名「テフロン(登録商標)PTFE」三井・デュポンフロロケミカル製)等が挙げられる。
テトラフルオロエチレンユニットのフッ素置換率は100%であり、パーフルオロアルコキシビニルエーテルユニットのフッ素置換率は75%であるため、PFAのフッ素置換率は共重合比率m、nに依存して変化する。
テトラフルオロエチレンユニットのフッ素置換率は100%であり、ヘキサフルオロプロピレンユニットのフッ素置換率は100%であるため、FEPのフッ素置換率は100%である。
テトラフルオロエチレンユニットのフッ素置換率は100%であり、エチレンユニットのフッ素置換率は0%であるため、ETFEのフッ素置換率は共重合比率m、nに依存して変化する。
クロロトリフルオロエチレンユニットのフッ素置換率は75%であり、エチレンユニットのフッ素置換率は0%であるため、ECTFEのフッ素置換率は共重合比率m、nに依存して変化する。
る。
上記エレクトレット性微粒子の製造方法は限定的ではないが、本発明では、少なくとも表面部分にエレクトレット性樹脂及び高分子分散剤を含有する微粒子を形成した後、当該微粒子に電子線照射、放射線照射又はコロナ放電することにより好適にエレクトレット性微粒子を製造することができる。
(1)顔料を分散可能な材料と顔料を撹拌することにより顔料分散体を得る工程1、
(2)前記顔料分散体にエレクトレット性樹脂及び高分子分散剤を添加・撹拌する工程2、
(3)前記混合液に硬化剤又は重合開始剤を添加・撹拌する工程3、
(4)乳化剤を添加・撹拌した水相に、(3)の溶液を添加・撹拌することによりコアシェル構造体を形成する工程4。
(電気泳動表示装置)
エレクトレット性微粒子は、顔料により着色(好ましくは透明着色)されている。かかる着色されたエレクトレット性微粒子を荷電粒子として用いてカラー画像を表示する電気泳動表示装置としては、例えば、
荷電粒子を収容する少なくとも3層のセルを有し、マトリクス状に配置されて各画素を表示する複数の表示部と、
前記各セルの上面又は下面に設けられた第1の電極と、
前記各セルの側端部に設けられた第2の電極と、を備え、
前記荷電粒子は、前記各表示部において前記セル毎に異なる色に着色されている、電気泳動表示装置が好適である。
エレクトレット性微粒子の原料として下記を用意した。詳細な組成を表1に示す。
A.VT470(フッ素樹脂:シェル部分原料)
B.分散性向上樹脂(=高分子分散剤、表1に示す3種)
C.ウレタン樹脂球
D.アクリル樹脂球
E.PVA224(乳化剤の原料)
下記の手順によりエレクトレット性微粒子を調製した。
実施例1~5及び比較例1~3で得られたエレクトレット性微粒子について図4に示す電気泳動試験装置を用いて電気泳動試験を行った。具体的には、次の通りである。
実施例1~5及び比較例1~3で得られたエレクトレット性微粒子について分散性試験を行った。具体的には、次の通りである。
2.表示部
3.第1の電極
4.第2の電極
5a~5c.第1~第3のセル
6a~6c.第1~第3の荷電粒子
Claims (11)
- エレクトレット性微粒子であって、当該エレクトレット性微粒子は少なくとも表面部分にエレクトレット性樹脂及び高分子分散剤を含有し、
前記エレクトレット性樹脂は、フッ素含有樹脂であり、且つ、電子線照射、放射線照射又はコロナ放電によりエレクトレット化されている、ことを特徴とするエレクトレット性微粒子。 - コア部分とシェル部分を有するコアシェル型のエレクトレット性微粒子であって、
前記コア部分は、顔料を分散可能な材料を含有し、前記シェル部分は、エレクトレット性樹脂及び高分子分散剤を含有し、
前記エレクトレット性樹脂は、フッ素含有樹脂であり、且つ、電子線照射、放射線照射又はコロナ放電によりエレクトレット化されている、請求項1に記載のエレクトレット性微粒子。 - 前記エレクトレット性樹脂は、フッ素置換率が10%以上のフッ素含有樹脂である、請求項1又は2に記載のエレクトレット性微粒子。
- 前記エレクトレット性樹脂がビニリデンフルオライド-ヘキサフルオロプロピレン-テトラフルオロエチレン三元共重合体である、請求項1~3のいずれかに記載のエレクトレット性微粒子。
- 前記顔料を分散可能な材料が樹脂である、請求項2~4のいずれかに記載のエレクトレット性微粒子。
- 前記エレクトレット性微粒子の平均粒子径が1000μm以下である、請求項1~5のいずれかに記載のエレクトレット性微粒子。
- コア部分とシェル部分を有するコアシェル型のエレクトレット性微粒子であって、
前記コア部分は、顔料を分散可能な樹脂及び平均粒子径が0.02~0.2μmの顔料を含有し、前記シェル部分は、エレクトレット性樹脂及び高分子分散剤を含有し、
前記エレクトレット性樹脂がビニリデンフルオライド-ヘキサフルオロプロピレン-テトラフルオロエチレン三元共重合体であり、且つ、電子線照射、放射線照射又はコロナ放電によりエレクトレット化されており、
前記エレクトレット性微粒子の平均粒子径が1000μm以下である、請求項1に記載のエレクトレット性微粒子。 - エレクトレット性微粒子の製造方法であって、
少なくとも表面部分にエレクトレット性樹脂及び高分子分散剤を含有する微粒子を形成した後、当該微粒子に電子線照射、放射線照射又はコロナ放電することを特徴とするエレクトレット性微粒子の製造方法。 - 前記微粒子を電気泳動媒体に分散させて電子線照射、放射線照射又はコロナ放電する、請求項8に記載の製造方法。
- コアシェル型のエレクトレット性微粒子の製造方法であって、
顔料を分散可能な材料を含有するコア部分と、エレクトレット性樹脂であるフッ素含有樹脂及び高分子分散剤を含有するシェル部分と、からなるコアシェル構造体を形成した後、当該コアシェル構造体に電子線照射、放射線照射又はコロナ放電する、請求項8に記載の製造方法。 - 前記コアシェル構造体を電気泳動媒体に分散させて電子線照射、放射線照射又はコロナ放電する、請求項10に記載の製造方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201380021131.1A CN104246595A (zh) | 2012-03-21 | 2013-03-21 | 驻极体性微粒及其制造方法 |
US14/386,541 US20150219976A1 (en) | 2012-03-21 | 2013-03-21 | Fine electretic particles and process for producing same |
KR1020147028974A KR20140138295A (ko) | 2012-03-21 | 2013-03-21 | 일렉트릿성 미립자 및 이의 제조방법 |
EP13764460.5A EP2835686A4 (en) | 2012-03-21 | 2013-03-21 | FINE ELECTRETIC PARTICLES AND METHOD FOR THE PRODUCTION THEREOF |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012064251A JP2013195824A (ja) | 2012-03-21 | 2012-03-21 | エレクトレット性微粒子及びその製造方法 |
JP2012-064251 | 2012-03-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013141270A1 true WO2013141270A1 (ja) | 2013-09-26 |
Family
ID=49222727
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/057966 WO2013141270A1 (ja) | 2012-03-21 | 2013-03-21 | エレクトレット性微粒子及びその製造方法 |
Country Status (7)
Country | Link |
---|---|
US (1) | US20150219976A1 (ja) |
EP (1) | EP2835686A4 (ja) |
JP (1) | JP2013195824A (ja) |
KR (1) | KR20140138295A (ja) |
CN (1) | CN104246595A (ja) |
TW (1) | TWI580711B (ja) |
WO (1) | WO2013141270A1 (ja) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016004217A (ja) * | 2014-06-18 | 2016-01-12 | 株式会社サクラクレパス | エレクトレット性微粒子の製造方法 |
KR102394634B1 (ko) * | 2015-03-31 | 2022-05-09 | (주)아모레퍼시픽 | 자기이온영동 성능을 가지는 콜로이드, 이의 제조방법 및 이를 함유한 화장료 조성물 |
WO2018101359A1 (ja) * | 2016-11-30 | 2018-06-07 | 株式会社ユポ・コーポレーション | 圧電素子および楽器 |
CN109004948B (zh) * | 2018-08-31 | 2020-07-28 | 北京航空航天大学 | 一种旋转驻极体式机械天线低频通信系统 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005031189A (ja) | 2003-07-08 | 2005-02-03 | Bridgestone Corp | 画像表示装置用粉体及び画像表示装置 |
JP2006293027A (ja) * | 2005-04-11 | 2006-10-26 | Canon Inc | 電気泳動粒子及びその製造方法 |
JP2007206570A (ja) | 2006-02-03 | 2007-08-16 | Ricoh Co Ltd | 画像表示媒体用粒子及びその製造方法、並びに画像表示媒体及び画像表示装置 |
JP2010020220A (ja) * | 2008-07-14 | 2010-01-28 | Ricoh Co Ltd | 電気泳動粒子及びその製造方法、並びに画像表示媒体及び画像表示装置 |
JP4903907B1 (ja) * | 2011-05-13 | 2012-03-28 | 株式会社サクラクレパス | エレクトレット性微粒子及びその製造方法 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6987502B1 (en) * | 1999-01-08 | 2006-01-17 | Canon Kabushiki Kaisha | Electrophoretic display device |
CA2337087C (en) * | 2000-03-08 | 2006-06-06 | Canon Kabushiki Kaisha | Magnetic toner, process for production thereof, and image forming method, apparatus and process cartridge using the toner |
TWI250894B (en) * | 2002-01-03 | 2006-03-11 | Sipix Imaging Inc | Functionalized halogenated polymers for microencapsulation |
US7382514B2 (en) * | 2002-02-11 | 2008-06-03 | Sipix Imaging, Inc. | Core-shell particles for electrophoretic display |
JP2004085635A (ja) * | 2002-08-22 | 2004-03-18 | Tdk Corp | 表示装置 |
TWI228632B (en) * | 2003-02-06 | 2005-03-01 | Sipix Imaging Inc | Improved electrophoretic display with a bi-modal particle system |
JP2005154705A (ja) * | 2003-11-20 | 2005-06-16 | Takao Kawamura | 放射線照射による電子トラップをもつ負荷電微粒子 |
WO2009038202A1 (ja) * | 2007-09-20 | 2009-03-26 | Mitsubishi Chemical Corporation | 静電荷像現像用トナー、静電荷像現像用トナーを用いたカートリッジ及び画像形成装置 |
JP5700949B2 (ja) * | 2009-04-14 | 2015-04-15 | 日東電工株式会社 | エレクトレット材の製造方法 |
JP4820891B2 (ja) * | 2009-07-06 | 2011-11-24 | 株式会社サクラクレパス | エレクトレット性微粒子の製造方法 |
JP4882020B1 (ja) * | 2010-10-27 | 2012-02-22 | 株式会社サクラクレパス | 電気泳動表示装置 |
JP4774130B1 (ja) * | 2010-12-02 | 2011-09-14 | 株式会社サクラクレパス | エレクトレット性微粒子又は粗粉の製造方法 |
-
2012
- 2012-03-21 JP JP2012064251A patent/JP2013195824A/ja active Pending
-
2013
- 2013-03-20 TW TW102109849A patent/TWI580711B/zh not_active IP Right Cessation
- 2013-03-21 CN CN201380021131.1A patent/CN104246595A/zh active Pending
- 2013-03-21 EP EP13764460.5A patent/EP2835686A4/en not_active Withdrawn
- 2013-03-21 KR KR1020147028974A patent/KR20140138295A/ko not_active Application Discontinuation
- 2013-03-21 US US14/386,541 patent/US20150219976A1/en not_active Abandoned
- 2013-03-21 WO PCT/JP2013/057966 patent/WO2013141270A1/ja active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005031189A (ja) | 2003-07-08 | 2005-02-03 | Bridgestone Corp | 画像表示装置用粉体及び画像表示装置 |
JP2006293027A (ja) * | 2005-04-11 | 2006-10-26 | Canon Inc | 電気泳動粒子及びその製造方法 |
JP2007206570A (ja) | 2006-02-03 | 2007-08-16 | Ricoh Co Ltd | 画像表示媒体用粒子及びその製造方法、並びに画像表示媒体及び画像表示装置 |
JP2010020220A (ja) * | 2008-07-14 | 2010-01-28 | Ricoh Co Ltd | 電気泳動粒子及びその製造方法、並びに画像表示媒体及び画像表示装置 |
JP4903907B1 (ja) * | 2011-05-13 | 2012-03-28 | 株式会社サクラクレパス | エレクトレット性微粒子及びその製造方法 |
Non-Patent Citations (2)
Title |
---|
"Shinban Kobunshi Jiten", 25 November 1988, ASAKURA SHOTEN |
See also references of EP2835686A4 |
Also Published As
Publication number | Publication date |
---|---|
EP2835686A4 (en) | 2015-12-09 |
TWI580711B (zh) | 2017-05-01 |
CN104246595A (zh) | 2014-12-24 |
TW201348305A (zh) | 2013-12-01 |
US20150219976A1 (en) | 2015-08-06 |
KR20140138295A (ko) | 2014-12-03 |
EP2835686A1 (en) | 2015-02-11 |
JP2013195824A (ja) | 2013-09-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5014507B1 (ja) | エレクトレット性微粒子及びその製造方法 | |
WO2013141270A1 (ja) | エレクトレット性微粒子及びその製造方法 | |
JP4820891B2 (ja) | エレクトレット性微粒子の製造方法 | |
US9074060B2 (en) | Processes for manufacturing electret fine particles or coarse powder | |
JP2014002272A5 (ja) | ||
WO2015194443A1 (ja) | エレクトレット性微粒子の製造方法 | |
JP6133653B2 (ja) | エレクトレット性微粒子及びその製造方法 | |
JP2016004216A (ja) | エレクトレット性微粒子の製造方法 | |
JP4837109B2 (ja) | エレクトレット性粗粉の製造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 13764460 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 20147028974 Country of ref document: KR Kind code of ref document: A |
|
REEP | Request for entry into the european phase |
Ref document number: 2013764460 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2013764460 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14386541 Country of ref document: US |