WO2019189420A1 - ポリエチレンテレフタレート系樹脂粒子 - Google Patents
ポリエチレンテレフタレート系樹脂粒子 Download PDFInfo
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- WO2019189420A1 WO2019189420A1 PCT/JP2019/013287 JP2019013287W WO2019189420A1 WO 2019189420 A1 WO2019189420 A1 WO 2019189420A1 JP 2019013287 W JP2019013287 W JP 2019013287W WO 2019189420 A1 WO2019189420 A1 WO 2019189420A1
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- polyethylene terephthalate
- resin particles
- terephthalate resin
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- 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
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
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- 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
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
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- 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
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- 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
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- 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
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/046—Forming abrasion-resistant coatings; Forming surface-hardening coatings
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
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- 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
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
Definitions
- the present invention relates to polyethylene terephthalate resin particles, a method for producing the resin particles, a dispersion containing the resin particles, and an optical film containing the resin particles.
- Resin particles are used to modify and improve various materials by utilizing a large specific surface area and particle structure.
- Major applications include cosmetics such as foundations, antiperspirants, scrubs, matting agents for paints, rheology modifiers, antiblocking agents, slipperiness agents, light diffusing agents, conductive agents, medical Applications such as various agents such as diagnostic test agents for use, additives for molded products such as automobile materials and building materials.
- Patent Document 1 discloses a white reflective film having a reflective layer A and a surface layer B containing particles made of resin.
- An object of the present invention is to provide polyethylene terephthalate resin particles having excellent scratch resistance when used in a film. Moreover, the subject of this invention is providing the manufacturing method of the said resin particle, the dispersion containing the said resin particle, and the optical film containing the said resin particle.
- the present invention [1] The volume average particle size is 1 to 100 ⁇ m, the coefficient of variation of the volume average particle size is 45% or less, and the content of particles having a particle size twice or more the volume average particle size is 3.0.
- Polyethylene terephthalate resin particles having a volume% or less [2] The method for producing resin particles according to [1], wherein a polyethylene terephthalate-based raw material resin having an intrinsic viscosity of 0.7 dl / g or more and 1.5 dl / g or less is subjected to freeze pulverization with a volume average particle diameter of 10 to A method of producing polyethylene terephthalate resin particles, comprising a step of primary pulverization to 200 ⁇ m and a step of secondary pulverization of the primary pulverized resin to a volume average particle diameter of 1 to 100 ⁇ m by a fluidized bed jet mill, [3] A dispersion comprising the polyethylene terephthalate resin particles according to [1] and a bin
- the manufacturing method of the said resin particle, the dispersion containing the said resin particle, and the optical film containing the said resin particle can be provided.
- Example 2 is a photograph of polyethylene terephthalate resin particles of Example 1.
- 2 is a photograph of polyethylene terephthalate resin particles of Comparative Example 1.
- the polyethylene terephthalate resin particles of the present invention have the following physical properties.
- volume average particle diameter of the polyethylene terephthalate resin particles of the present invention is 1 to 100 ⁇ m, preferably 20 to 60 ⁇ m, more preferably from the viewpoint of scratch resistance. Is 30 to 50 ⁇ m. From the viewpoint of scratch resistance, the coefficient of variation (CV value) is 45% or less, preferably 40% or less. In addition, from the viewpoint of scratch resistance, the content of particles having a particle diameter that is twice or more the volume average particle diameter (coarse particles) is 3.0% by volume or less, preferably 2.0% by volume or less. More preferably, it is 1.0 volume% or less.
- the volume average particle size, the coefficient of variation, and the measurement of the content of particles having a particle size that is twice or more the volume average particle size are measured by Coulter Multisizer TM 3 (Beckman Coulter, Inc. measuring device). Measurement shall be performed using an aperture calibrated according to the Multisizer TM 3 User's Manual published by Beckman Coulter. The aperture used for the measurement is appropriately selected depending on the size of the resin particle to be measured. Current (aperture current) and Gain (gain) are appropriately set according to the size of the selected aperture. For example, when an aperture having a size of 50 ⁇ m is selected, the current (aperture current) is set to ⁇ 800 and the gain (gain) is set to 4.
- 0.1 g of resin particles in 10 ml of a 0.1% by weight nonionic surfactant aqueous solution were mixed with a touch mixer (manufactured by Yamato Kagaku Co., Ltd., “TOUCHMIXER MT-31”) and an ultrasonic cleaner (Velvo Creer). Dispersed using “ULTRASONICCLEANER VS-150” manufactured by the company, and used as a dispersion. During the measurement, the beaker is gently stirred to the extent that bubbles do not enter, and the measurement ends when 100,000 resin particles are measured.
- the volume average particle diameter of the resin particles is an arithmetic average in a volume-based particle size distribution of 100,000 particles.
- the variation coefficient (CV value) of the particle diameter is calculated by the following formula.
- Variation coefficient of particle diameter (standard deviation of particle size distribution of resin particles / volume average particle diameter of resin particles) ⁇ 100
- the content of particles having a particle diameter twice as large as the volume average particle diameter is a volume-based ratio of particles having a diameter equal to or larger than twice the above-mentioned volume average particle diameter.
- the average circularity of the resin particles of the present invention is preferably 0.82 to 0.92, more preferably 0.83 to 0.90, from the viewpoint of scratch resistance. Further, from the viewpoint of scratch resistance, the average circularity of particles having a particle diameter equal to or larger than the median area circle equivalent diameter is preferably 0.83 to 0.92, and more preferably 0.84 to 0.90. It is. The circularity is measured by the method described in Examples described later.
- the polyethylene terephthalate-based resin is preferably composed of ethylene terephthalate units of 90 mol% or more, preferably 95 mol% or more, more preferably 98 mol% or more as a resin component.
- other components include acid components such as isophthalic acid, naphthalenedicarboxylic acid, and sebacic acid, and glycol components such as diethylene glycol and propylene glycol. More specifically, for example, an ethylene isophthalate unit, an ethylene naphthalene dicarboxylate unit, a diethylene terephthalate unit and the like can be mentioned.
- the raw material polyethylene terephthalate is preferably a homopolymer, but the dicarboxylic acid component other than terephthalic acid such as isophthalic acid and naphthalenedicarboxylic acid and / or ethylene glycol such as diethylene glycol is 10 mol% or less based on the total dicarboxylic acid component. Copolymers using other glycol components may be used. Moreover, the blend polymer which mixed the other condensation resin 10 mass% or less with respect to the total mass may be sufficient.
- the intrinsic viscosity (IV value) of the polyethylene terephthalate resin particles is preferably 0.7 dl / g or more, more preferably 0, from the viewpoint of narrowing the particle size distribution or suppressing scratches due to deformation of the resin particles. .75 dl / g or more, more preferably 0.80 dl / g or more, and preferably 1 from the viewpoint of suppressing damage to other members due to the hardness of the resin particles being too high, or performing fine grinding. It is 0.5 dl / g or less, More preferably, it is 1.45 dl / g or less, More preferably, it is 1.40 dl / g or less.
- the intrinsic viscosity is measured by the following method.
- the polyethylene terephthalate resin particles of the present invention may contain other additives as necessary.
- Other additives include plasticizers, flame retardants, flame retardant aids, antistatic agents, spreading agents, foam control agents, fillers, colorants, mold release agents, weathering agents, anti-aging agents, lubricants, anti-proofing agents.
- flavor, etc. are mentioned, the thing which does not contain a coloring agent and / or a mold release agent from a viewpoint of the coating nonuniformity suppression at the time of using for coating is preferable.
- the manufacturing method of the polyethylene terephthalate-type resin particle of this invention is not specifically limited, As a preferable aspect, the manufacturing method including the following primary grinding
- a polyethylene terephthalate-based resin having an intrinsic viscosity of 0.7 dl / g or more and 1.5 dl / g or less is roughly pulverized to a volume average particle size of 10 to 200 ⁇ m by freeze pulverization. It is a process. From the viewpoint of improving the secondary pulverization step, it is preferable to coarsely pulverize to a volume average particle size of 10 to 150 ⁇ m.
- the freeze pulverization is performed by a known freeze pulverization method.
- freeze pulverizer A well-known thing can be used for the said freeze pulverizer.
- the secondary pulverization step is a step of finely pulverizing the primary pulverized resin to a volume average particle size of 1 to 100 ⁇ m with a fluidized bed jet mill (counter jet mill).
- a fluidized bed type jet mill when used, when the polyethylene terephthalate resin particles collide with each other and become finer, friction between the resin particles tends to occur, and the resulting polyethylene terephthalate resin particles are slightly rounded. Excellent scratch resistance.
- the volume average particle size after pulverization, the coefficient of variation, and the content of particles having a particle size that is twice or more the volume average particle size are the same as described above.
- the polyethylene terephthalate resin particles of the present invention when used in a film, are excellent in scratch resistance of the film, and therefore can be suitably used as an additive for optical films.
- the polyethylene terephthalate resin particles of the present invention are also suitably provided as a dispersion form.
- a dispersion includes the polyethylene terephthalate resin particles of the present invention and a binder, and the polyethylene terephthalate resin particles of the present invention are dispersed in the binder as a dispersoid.
- binder examples include acrylic resin, alkyd resin, polyester resin, polyurethane resin, chlorinated polyolefin resin, amorphous polyolefin resin, and ultraviolet curable resin.
- the dispersion may further include a crosslinking agent, solvent, coating surface adjusting agent, fluidity adjusting agent, ultraviolet absorber, light stabilizer, curing catalyst, extender pigment, colored pigment, metal pigment, mica powder. Pigments, dyes and the like can optionally be included.
- the dispersion containing the polyethylene terephthalate resin particles of the present invention is excellent in scratch resistance, it is preferably used for an optical film such as a light diffusion sheet.
- an optical film containing the polyethylene terephthalate resin particles of the present invention can be prepared by applying the dispersion on an optical base film, and the optical film is excellent in scratch resistance.
- the mass ratio of the polyethylene terephthalate resin particles to the binder in the dispersion is preferably from 1/10 to 1/1, and more preferably from 1/5 to 1/2, from the viewpoint of obtaining an optical film excellent in light diffusibility.
- Example 1 Pellet raw material polyethylene terephthalate resin (IV value 1.04 / CH-611 / manufactured by Totobo) was coarsely pulverized to a volume average particle size of 100 ⁇ m by freeze pulverization. Thereafter, the mixture was finely pulverized by a fluidized bed type opposed jet mill (Counter Jet Mill 100AFG, manufactured by Hosokawa Micron Corporation) at a supply speed of 1 kg / hr, a pulverization pressure of 0.7 MPa, and a rotor rotational speed of 15000 rpm.
- a fluidized bed type opposed jet mill Counter Jet Mill 100AFG, manufactured by Hosokawa Micron Corporation
- the obtained polyethylene terephthalate resin particles have a volume average particle size of 34.4 ⁇ m, a CV value of 26.4%, and a content of particles having a particle size more than twice the volume average particle size (coarse particles) is 1. It was 4% by volume.
- Example 2 Polyethylene terephthalate resin particles were prepared in the same manner as in Example 1 except that the raw material resin was changed to the resin type described in Table 1. The details of the resin type are as follows.
- TR-BB Polyethylene terephthalate resin (IV value 0.88 / manufactured by Teijin Limited)
- Comparative Example 1 Polyethylene terephthalate resin particles of Comparative Example 1 were obtained by roughly pulverizing a pellet-shaped raw material polyethylene terephthalate resin (IV value 0.60 / TRN-MTJ / manufactured by Teijin Ltd.) to a volume average particle size of 33.4 ⁇ m by freezing Got.
- Example 1 The obtained polyethylene terephthalate resin particles of Example 1 and Comparative Example 1 were photographed with a scanning electron microscope (manufactured by JEOL Ltd., model: JSM-6360LV). Photos are shown in FIGS.
- the obtained dispersion was applied onto a PET film having a thickness of 125 ⁇ m using a coating apparatus in which a blade having a clearance of 100 ⁇ m was set, and then dried at 70 ° C. for 10 minutes to obtain a light diffusion sheet.
- the coating unevenness and scratch resistance of the obtained light diffusion sheet were evaluated in the following manner, and the results are shown in Table 2.
- Coating unevenness The light diffusion sheet was visually observed to confirm the presence of a portion where the polyethylene terephthalate resin particles are concentrated and a portion where the polyethylene terephthalate resin particles are small, that is, the presence of so-called coating unevenness. The case where the coating unevenness could not be observed was judged as “good”, and the case where the coating unevenness was observed was judged as “bad”.
- a dyeing friction fastness tester manufactured by Daiei Scientific Instruments Co., Ltd. was used. Two planar rectangular test pieces having a length of 12 cm and a width of 5 cm were cut out from the light diffusion sheet. The test piece was placed and fixed on the sample stage of the dyeing product friction fastness tester so that the light diffusion layer (layer coated with polyethylene terephthalate resin particles) was on top. Fix another test piece with the light diffusion layer facing upward on the friction piece of the dyeing friction fastness tester, and place a 500 g weight (contact area to the test piece is 4 cm 2 ) on the test piece for 30 reciprocations.
- the scratches of the light diffusion layer were evaluated by rubbing by reciprocating a distance of 10 cm 20 times in parallel with the long side direction of the test piece at a speed of / min. The case where the scratch of the light diffusion layer could not be confirmed with the naked eye was determined as “good”, and the case where the scratch was confirmed was determined as “bad”.
- the light diffusing sheets 1 and 2 containing the polyethylene terephthalate resin particles of the present invention were excellent in both coating unevenness and scratch resistance.
- the light diffusion sheet 3 which is an optical sheet having a wide particle size distribution and resin particles containing many particle diameters twice as large as the volume average diameter has coating unevenness and inferior scratch resistance.
- the polyethylene terephthalate resin particles of the present invention when used in a film, are excellent in scratch resistance of the film, and therefore can be suitably used as an additive for optical films.
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Abstract
Description
[1]体積平均粒子径が1~100μmで、前記体積平均粒子径の変動係数が45%以下であり、前記体積平均粒子径の2倍以上の粒子径を有する粒子の含有量が3.0体積%以下であるポリエチレンテレフタレート系樹脂粒子、
[2][1]に記載の樹脂粒子の製造方法であって、固有粘度が0.7dl/g以上1.5dl/g以下のポリエチレンテレフタレート系原料樹脂を、冷凍粉砕で体積平均粒子径10~200μmに1次粉砕する工程と、1次粉砕された樹脂を、流動層型ジェットミルで体積平均粒子径1~100μmに2次粉砕する工程とを含む、ポリエチレンテレフタレート系樹脂粒子の製造方法、
[3][1]に記載のポリエチレンテレフタレート系樹脂粒子と、バインダーとを含み、前記ポリエチレンテレフタレート系樹脂粒子が分散質として前記バインダーに分散されている、分散体、及び
[4][1]に記載のポリエチレンテレフタレート系樹脂粒子を含む、光学フィルムに関する。
本発明のポリエチレンテレフタレート系樹脂粒子は、以下の諸物性を有する。
(a)体積平均粒子径
本発明のポリエチレンテレフタレート系樹脂粒子の体積平均粒子径は、耐擦傷性の観点から、1~100μmであり、好ましくは20~60μmであり、より好ましくは30~50μmである。また、耐擦傷性の観点から、変動係数(CV値)が45%以下であり、好ましくは40%以下である。また、耐擦傷性の観点から、体積平均粒子径の2倍以上の粒子径を有する粒子(粗大粒子)の含有量が、3.0体積%以下であり、好ましくは2.0体積%以下であり、より好ましくは1.0体積%以下である。
測定は、ベックマン・コールター社発行のMultisizerTM3ユーザーズマニュアルに従って校正されたアパチャーを用いて実施するものとする。
なお、測定に用いるアパチャーは、測定する樹脂粒子の大きさによって、適宜選択する。Current(アパチャー電流)及びGain(ゲイン)は、選択したアパチャーのサイズによって、適宜設定する。例えば、50μmのサイズを有するアパチャーを選択した場合、Current(アパチャー電流)は-800、Gain(ゲイン)は4と設定する。
測定用試料としては、樹脂粒子0.1gを0.1質量%ノニオン性界面活性剤水溶液10ml中にタッチミキサー(ヤマト科学社製、「TOUCHMIXER MT-31」)及び超音波洗浄器(ヴェルヴォクリーア社製、「ULTRASONICCLEANER VS-150」)を用いて分散させ、分散液としたものを使用する。測定中はビーカー内を気泡が入らない程度に緩く撹拌しておき、樹脂粒子を10万個測定した時点で測定を終了する。樹脂粒子の体積平均粒子径は、10万個の粒子の体積基準の粒度分布における算術平均である。
粒子径の変動係数(CV値)を、以下の数式によって算出する。
粒子径の変動係数=(樹脂粒子の体積基準の粒度分布の標準偏差
÷樹脂粒子の体積平均粒子径)×100
体積平均粒子径の2倍の粒子径を有する粒子の含有量は、上述の体積平均粒子径の2倍径以上の粒子の体積基準の割合のことである。
本発明の樹脂粒子の平均円形度は、耐擦傷性の観点から、好ましくは0.82~0.92であり、より好ましくは0.83~0.90である。また耐擦傷性の観点から、面積円相当径の中央値以上の粒子径を有する粒子の平均円形度は、好ましくは0.83~0.92であり、より好ましくは0.84~0.90である。円形度は、後述の実施例に記載の方法により測定される。
ポリエチレンテレフタレート系樹脂は、樹脂成分として具体的には90モル%以上、好ましくは95モル%以上、さらに好ましくは98モル%以上のエチレンテレフタレート単位からなることが好ましい。他の成分としては、イソフタル酸、ナフタレンジカルボン酸、セバシン酸等の酸成分、ジエチレングリコール、プロピレングリコール等のグリコール成分を例示することができる。さらに具体的には、例えばエチレンイソフタレート単位、エチレンナフタレンジカルボキシレート単位、ジエチレンテレフタレート単位等が挙げられる。すなわち原料ポリエチレンテレフタレートは、ホモポリマーであることが好ましいが、全ジカルボン酸成分に対し10モル%以下の、イソフタル酸、ナフタレンジカルボン酸等のテレフタル酸以外のジカルボン酸成分及び/又はジエチレングリコール等のエチレングリコール以外のグリコール成分を用いた共重合ポリマーであってもよい。また、全質量に対し10質量%以下の他の縮合樹脂を混合させたブレンドポリマーであってもよい。
ポリエチレンテレフタレート系樹脂粒子の固有粘度は、基材樹脂0.5gをテトラクロロエタン/フェノール=50/50(質量比)混合溶液100ml中に加熱溶解した後、冷却して25℃で測定された溶液粘度から算出する。
本発明のポリエチレンテレフタレート系樹脂粒子には、必要に応じて、他の添加剤が含まれていてもよい。他の添加剤としては、可塑剤、難燃剤、難燃助剤、帯電防止剤、展着剤、気泡調整剤、充填剤、着色剤、離型剤、耐候剤、老化防止剤、滑剤、防曇剤、香料などが挙げられるが、コーティングに用いた際の塗工ムラ抑制の観点から、着色剤及び/又は離型剤を含まないものが好ましい。
本発明のポリエチレンテレフタレート系樹脂粒子の製造方法は、特に限定されるものではないが、好ましい態様として、下記の1次粉砕工程と2次粉砕工程とを含む製造方法が挙げられる。
1次粉砕工程は、固有粘度が0.7dl/g以上1.5dl/g以下のポリエチレンテレフタレート系原料樹脂を、冷凍粉砕で体積平均粒子径10~200μmに粗粉砕する工程である。2次粉砕工程を効率よくする観点から、体積平均粒子径10~150μmに粗粉砕することが好ましい。冷凍粉砕は、公知の冷凍粉砕方法によって行われる。すなわち、ポリエチレン系原料樹脂を液体窒素に浸漬して冷凍し、冷凍後のポリエチレンテレフタレート系原料樹脂を冷凍粉砕機に投入して粉砕することにより行われる。前記冷凍粉砕機は、公知のものを使用することができる。
2次粉砕工程は、1次粉砕された樹脂を、流動層型ジェットミル(カウンタージェットミル)で体積平均粒子径1~100μmに微粉砕する工程である。流動層型ジェットミルを用いると、ポリエチレンテレフタレート系樹脂粒子同士が衝突し微細化していく際に当該樹脂粒子同士の摩擦が起こりやすく、得られるポリエチレンテレフタレート系樹脂粒子が少し丸みを帯びているため耐擦傷性に優れている。なお、微粉砕後の体積平均粒子径、変動係数、及び体積平均粒子径の2倍以上の粒子径を有する粒子の含有量については、前記と同様である。
ポリエチレンテレフタレート系樹脂粒子の円形度は乾式粒子画像分析装置(スペクトリス社製、モフォロギ G3)を用いて測定した。当該装置では、粒子の投影像の周囲長をP、粒子の投影像の面積をAとしたとき、4πA/P2で表される値を円形度として求めている。20000個について測定し、その平均値を平均円形度として求めた。また、面積円相当径の中央値以上の粒子径を有する粒子の平均円形度も求めた。
実施例1
ペレット状の原料ポリエチレンテレフタレート樹脂(IV値1.04/CH-611/遠東紡社製)を冷凍粉砕にて体積平均粒子径100μmに粗粉砕した。その後、流動層式対向型ジェットミル(カウンタージェットミル100AFG、ホソカワミクロン社製)で、供給速度1kg/hr、粉砕圧力0.7MPa、ローター回転数15000rpmで微粉砕した。得られたポリエチレンテレフタレート系樹脂粒子の体積平気粒子径は34.4μm、CV値は26.4%、体積平均粒子径の2倍以上の粒子径を有する粒子(粗大粒子)の含有量は1.4体積%であった。
原料樹脂を表1に記載した樹脂種に変更した以外は実施例1と同様にしてポリエチレンテレフタレート系樹脂粒子を調製した。なお、樹脂種の詳細は以下のとおりである。
TR-BB:ポリエチレンテレフタレート樹脂(IV値0.88/帝人社製)
ペレット状の原料ポリエチレンテレフタレート樹脂(IV値0.60/TRN-MTJ/帝人社製)を冷凍粉砕にて体積平均粒子径33.4μmに粗粉砕することで、比較例1のポリエチレンテレフタレート系樹脂粒子を得た。
各実施例・比較例で得られたポリエチレンテレフタレート系樹脂粒子7.5質量部と、アクリル樹脂(DIC社製、製品名アクリディックA811)30質量部、架橋剤(DIC社製、製品名VM-D)10質量部、溶剤として酢酸ブチル50質量部とを攪拌脱泡装置を用いて、3分間混合し、1分間脱泡することによって、分散体を得た。
得られた分散体を、クリアランス100μmのブレードをセットした塗工装置を用いて、厚さ125μmのPETフィルム上に塗布した後、70℃で10分乾燥することによって光拡散シートを得た。
光拡散シートを目視観察し、ポリエチレンテレフタレート系樹脂粒子が集中している部分とポリエチレンテレフタレート系樹脂粒子の少ない部分の存在、所謂、塗工ムラの存在を確認した。塗工ムラの観察できなかった場合を「良」、塗工ムラが観察された場合を「不良」とした。
染色物摩擦堅牢度試験機(大栄科学精器製作所社製)を用いた。光拡散シートから縦12cm×横5cmの平面長方形状の試験片を2枚切り出した。染色物摩擦堅牢度試験機の試料台上に、試験片をその光拡散層(ポリエチレンテレフタレート系樹脂粒子を塗工した層)が上となるように載置、固定した。染色物摩擦堅牢度試験機の摩擦子に光拡散層を上向きにして別の試験片を固定し、更に、その上に500gの分銅(試験片への接触面積は4cm2)を乗せて30往復/分の速さで試験片の長辺方向と平行に10cmの距離を20回往復させて擦過し、光拡散層の傷つき性を評価した。光拡散層の傷が肉眼で確認できなかった場合を「良」、傷が確認できた場合を「不良」とした。
Claims (8)
- 体積平均粒子径が1~100μmで、前記体積平均粒子径の変動係数が45%以下であり、前記体積平均粒子径の2倍以上の粒子径を有する粒子の含有量が3.0体積%以下であるポリエチレンテレフタレート系樹脂粒子。
- 固有粘度が0.7dl/g以上1.5dl/g以下である、請求項1に記載のポリエチレンテレフタレート系樹脂粒子。
- 平均円形度が0.82~0.92である、請求項1または2に記載のポリエチレンテレフタレート系樹脂粒子。
- 着色剤及び/又は離型剤を含まない、請求項1~3いずれかに記載のポリエチレンテレフタレート系樹脂粒子。
- 光学フィルム用の添加剤に用いるための、請求項1~4いずれかに記載のポリエチレンテレフタレート系樹脂粒子。
- 請求項1~5いずれかに記載の樹脂粒子の製造方法であって、固有粘度が0.7dl/g以上1.5dl/g以下のポリエチレンテレフタレート系原料樹脂を、冷凍粉砕で体積平均粒子径10~200μmに1次粉砕する工程と、1次粉砕された樹脂を、流動層型ジェットミルで体積平均粒子径1~100μmに2次粉砕する工程とを含む、ポリエチレンテレフタレート系樹脂粒子の製造方法。
- 請求項1~5のいずれかに記載のポリエチレンテレフタレート系樹脂粒子と、バインダーとを含み、前記ポリエチレンテレフタレート系樹脂粒子が分散質として前記バインダーに分散されている、分散体。
- 請求項1~5いずれかに記載のポリエチレンテレフタレート系樹脂粒子を含む、光学フィルム。
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JPS5313639A (en) * | 1976-07-05 | 1978-02-07 | Dainippon Toryo Co Ltd | Preparation of slurry coating compositions |
JPH0770331A (ja) * | 1993-09-07 | 1995-03-14 | Toyobo Co Ltd | ポリエステル粒子 |
JP2015036715A (ja) * | 2013-08-12 | 2015-02-23 | 帝人デュポンフィルム株式会社 | 白色反射フィルム |
WO2017171087A1 (ja) * | 2016-03-31 | 2017-10-05 | 積水化成品工業株式会社 | 金属被覆異形樹脂粒子及びその製造方法、金属被覆異形樹脂粒子の配列膜及びその製造方法、粒子群、並びに粒子配列膜の製造方法 |
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JPS5313639A (en) * | 1976-07-05 | 1978-02-07 | Dainippon Toryo Co Ltd | Preparation of slurry coating compositions |
JPH0770331A (ja) * | 1993-09-07 | 1995-03-14 | Toyobo Co Ltd | ポリエステル粒子 |
JP2015036715A (ja) * | 2013-08-12 | 2015-02-23 | 帝人デュポンフィルム株式会社 | 白色反射フィルム |
WO2017171087A1 (ja) * | 2016-03-31 | 2017-10-05 | 積水化成品工業株式会社 | 金属被覆異形樹脂粒子及びその製造方法、金属被覆異形樹脂粒子の配列膜及びその製造方法、粒子群、並びに粒子配列膜の製造方法 |
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