JP4995496B2 - Toner for electrophotography - Google Patents
Toner for electrophotography Download PDFInfo
- Publication number
- JP4995496B2 JP4995496B2 JP2006168966A JP2006168966A JP4995496B2 JP 4995496 B2 JP4995496 B2 JP 4995496B2 JP 2006168966 A JP2006168966 A JP 2006168966A JP 2006168966 A JP2006168966 A JP 2006168966A JP 4995496 B2 JP4995496 B2 JP 4995496B2
- Authority
- JP
- Japan
- Prior art keywords
- toner
- resin
- styrene
- raw material
- monomer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229920005989 resin Polymers 0.000 claims description 127
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- 150000002736 metal compounds Chemical class 0.000 claims description 20
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Landscapes
- Developing Agents For Electrophotography (AREA)
Description
本発明は、電子写真法、静電記録法、静電印刷法等において形成される潜像の現像に用いられる電子写真用トナーに関する。 The present invention relates to an electrophotographic toner used for developing a latent image formed in an electrophotographic method, an electrostatic recording method, an electrostatic printing method or the like.
近年、プリンターの高速化及び高画質化に伴い、トナーにも高い性能が要求されている。なかでもフルカラープリンターに対するこれらの要求が顕著であり、高画質化及びトナーの帯電性の向上が求められている。高速化・高画質化に対しては、耐久性に優れ着色剤の分散性に優れたポリエステルを結着樹脂として使用することが開示されている（特許文献１参照）。帯電性に対しては、カラートナーに使用可能な無色の荷電制御剤であるベンジル酸誘導体のホウ素塩化合物を使用することが開示されている（特許文献２参照）。
しかしながら、ベンジル酸誘導体はトナー用樹脂、特にポリエステルへの付着力が低い為、粉砕時にトナーから分離し、微粉側に移行しやすい。このため、実使用に対するトナー中での使用率が低くなることから帯電制御が困難となり、その結果、画像劣化が生じやすくなる。また、微粉側への移行を考慮して原料の仕込み量を多くすると、ベンジル酸誘導体同士の凝集が起こり、さらに、帯電制御が困難となる。また、カラートナーでは着色剤の添加が必須であるが、特に、イエロートナー、その中でも、Ｃ．Ｉ．ピグメント・イエロー １８０を使用した場合に、ベンジル酸誘導体の微粉側への移行が問題となる。 However, since benzylic acid derivatives have low adhesion to toner resins, particularly polyester, they are easily separated from the toner during pulverization and easily migrate to the fine powder side. For this reason, since the usage rate in the toner for actual use becomes low, charging control becomes difficult, and as a result, image deterioration tends to occur. Further, if the amount of raw materials charged is increased in consideration of the shift to the fine powder side, aggregation of benzylic acid derivatives occurs, and furthermore, charging control becomes difficult. In addition, it is essential to add a colorant to a color toner. I. When Pigment Yellow 180 is used, migration of the benzylic acid derivative to the fine powder side becomes a problem.
本発明の課題は、ベンジル酸誘導体の金属化合物を含有した場合でも、連続印字において、帯電安定性に優れ、高画質を維持できる電子写真用トナーを提供することにある。 An object of the present invention is to provide an electrophotographic toner that is excellent in charging stability and can maintain high image quality in continuous printing even when it contains a metal compound of a benzylic acid derivative.
本発明は、
〔１〕 結着樹脂、着色剤、ベンジル酸誘導体の金属化合物及びスチレンを含有してなる電子写真用トナーであって、トナー中のスチレン含有量が3〜100ppmである電子写真用トナー、並びに
〔２〕 スチレンの存在下で得られる結着樹脂、着色剤及びベンジル酸誘導体の金属化合物を含有してなる電子写真用トナーであって、トナー中のスチレン含有量が3〜100ppmである電子写真用トナー
に関する。
The present invention
[1] An electrophotographic toner comprising a binder resin, a colorant, a metal compound of a benzylic acid derivative, and styrene, wherein the styrene content in the toner is 3 to 100 ppm, and [ 2] An electrophotographic toner comprising a binder resin obtained in the presence of styrene, a colorant, and a metal compound of a benzylic acid derivative, wherein the styrene content in the toner is 3 to 100 ppm. It relates to toner.
本発明の電子写真用トナーは、ベンジル酸誘導体の金属化合物を含有した場合でも、連続印字において、帯電安定性に優れ、高画質を維持できるという優れた効果を奏するものである。 The toner for electrophotography of the present invention exhibits excellent effects of excellent charging stability and maintaining high image quality in continuous printing even when a metal compound of a benzylic acid derivative is contained.
本発明の電子写真用トナーは、結着樹脂、着色剤、ベンジル酸誘導体の金属化合物及びスチレンを含有してなるトナー(態様１)、並びにスチレンの存在下で得られる結着樹脂、着色剤及びベンジル酸誘導体の金属化合物を含有してなるトナー(態様２)であって、それぞれのトナー中のスチレン含有量が3〜100ppmである点に大きな特徴を有する。前記構成により帯電量の安定化が可能となり高画質が維持できる詳細な理由は不明なるも、スチレンとベンジル酸誘導体の化学構造が互いに影響を及ぼし合うことにより、スチレンにより結着樹脂とベンジル酸誘導体との結びつきが強くなる結果、粉砕工程でのベンジル酸誘導体のトナーからの分離が抑制されるためと推定される。なお、スチレンを含有する結着樹脂に、さらにスチレンを添加して得られるトナー、即ち、態様１と態様２のトナーを組み合わせたトナーもまた、本発明に含まれる。 The electrophotographic toner of the present invention includes a binder resin, a colorant, a toner containing a benzylic acid derivative metal compound and styrene (embodiment 1), a binder resin obtained in the presence of styrene, a colorant, and A toner (embodiment 2) containing a metal compound of a benzylic acid derivative is characterized in that the styrene content in each toner is 3 to 100 ppm. Although the detailed reason why the charge amount can be stabilized and the high image quality can be maintained by the above configuration is unclear, the chemical structure of styrene and the benzylic acid derivative influence each other, so that the binder resin and the benzylic acid derivative are made of styrene. As a result, the separation of the benzylic acid derivative from the toner during the pulverization process is suppressed. Note that a toner obtained by further adding styrene to a binder resin containing styrene, that is, a toner obtained by combining the toners of Embodiments 1 and 2, is also included in the present invention.
態様１、２のトナー中のスチレン含有量は3〜100ppmであり、ベンジル酸誘導体のトナーからの分離抑制の観点から、好ましくは3〜80ppmであり、より好ましくは5〜60ppmである。本明細書において、スチレンの含有量は、後述の実施例に記載の方法により測定される。 The styrene content in the toners of Embodiments 1 and 2 is 3 to 100 ppm, and preferably 3 to 80 ppm, more preferably 5 to 60 ppm from the viewpoint of suppressing separation of the benzylic acid derivative from the toner. In the present specification, the content of styrene is measured by the method described in Examples described later.
態様１のトナーは、結着樹脂、着色剤、ベンジル酸誘導体の金属化合物及びスチレンを含有する。 The toner of aspect 1 contains a binder resin, a colorant, a metal compound of a benzylic acid derivative, and styrene.
結着樹脂としては、ポリエステル、ポリエステル・アミド、エポキシ樹脂、ポリカーボネート、ポリウレタン、スチレン−アクリル樹脂等が挙げられ、定着性及び帯電性の観点から、主成分としてポリエステルを含有する結着樹脂が好ましい。ポリエステルの含有量は、結着樹脂中、50〜100重量％が好ましく、80〜100重量％がより好ましく、実質的に100重量％が特に好ましい。 Examples of the binder resin include polyesters, polyester amides, epoxy resins, polycarbonates, polyurethanes, styrene-acrylic resins, and the like, and binder resins containing polyester as a main component are preferable from the viewpoint of fixability and chargeability. The content of the polyester is preferably 50 to 100% by weight, more preferably 80 to 100% by weight, particularly preferably 100% by weight in the binder resin.
ポリエステルは、特に限定されないが、2価以上のアルコールからなるアルコール成分と、2価以上のカルボン酸化合物からなるカルボン酸成分を含む原料モノマーを縮重合させて得られる。 The polyester is not particularly limited, and can be obtained by polycondensing a raw material monomer containing an alcohol component composed of a divalent or higher alcohol and a carboxylic acid component composed of a divalent or higher carboxylic acid compound.
2価以上のアルコールとしては、トナーの保存安定性の観点から、式(I)： As the dihydric or higher alcohol, from the viewpoint of storage stability of the toner, the formula (I):
（式中、ＲＯはアルキレンオキサイドであり、Ｒは炭素数2又は3のアルキレン基、ｘ及びｙはアルキレンオキサイドの平均付加モル数を示す正の数であり、ｘとｙの和は1〜16、好ましくは1.5〜5である）
で表されるビスフェノールAのアルキレンオキサイド付加物が好ましい。かかるビスフェノールAのアルキレンオキサイド付加物の含有量は、アルコール成分中、40モル％以上が好ましく、60モル％以上がより好ましく、80モル％以上がさらに好ましい。
(In the formula, RO is an alkylene oxide, R is an alkylene group having 2 or 3 carbon atoms, x and y are positive numbers indicating the average added mole number of alkylene oxide, and the sum of x and y is 1 to 16) (Preferably 1.5 to 5)
An alkylene oxide adduct of bisphenol A represented by The content of the alkylene oxide adduct of bisphenol A is preferably 40 mol% or more, more preferably 60 mol% or more, and still more preferably 80 mol% or more in the alcohol component.
式(I)で表されるビスフェノールAのアルキレンオキサイド付加物としては、ポリオキシエチレン-2,2-ビス(4-ヒドロキシフェニル)プロパン等のＲが炭素数2のエチレンオキサイド付加物、ポリオキシプロピレン-2,2-ビス(4-ヒドロキシフェニル)プロパン等のＲが炭素数3のプロピレンオキサイド付加物等が挙げられる。 Examples of the alkylene oxide adduct of bisphenol A represented by the formula (I) include polyoxyethylene-2,2-bis (4-hydroxyphenyl) propane and other ethylene oxide adducts having 2 carbon atoms, such as polyoxypropylene Examples thereof include propylene oxide adducts having 3 carbon atoms such as -2,2-bis (4-hydroxyphenyl) propane.
ビスフェノールAのアルキレンオキサイド付加物以外のアルコール成分としては、エチレングリコール、1,2-プロピレングリコール、1,4-ブタンジオール、ネオペンチルグリコール、ポリエチレングリコール、ポリプロピレングリコール、ビスフェノールA、水素添加ビスフェノールA、ソルビトール、ペンタエリスリトール、グリセロール、トリメチロールプロパン等が挙げられる。 The alcohol components other than the alkylene oxide adduct of bisphenol A include ethylene glycol, 1,2-propylene glycol, 1,4-butanediol, neopentyl glycol, polyethylene glycol, polypropylene glycol, bisphenol A, hydrogenated bisphenol A, and sorbitol. , Pentaerythritol, glycerol, trimethylolpropane and the like.
また、2価以上のカルボン酸化合物としては、例えば、アジピン酸、フマル酸、マレイン酸、コハク酸(例えば、n-ドデセニルコハク酸、イソドデセニルコハク酸、n-ドデシルコハク酸、イソオクテニルコハク酸、イソオクチルコハク酸等の炭素数1〜20のアルキル基または炭素数2〜20のアルケニル基で置換されたコハク酸)等の脂肪族カルボン酸、フタル酸、イソフタル酸、テレフタル酸、1,2,4-ベンゼントリカルボン酸(トリメリット酸)、2,5,7-ナフタレントリカルボン酸、ピロメリット酸等の芳香族カルボン酸、並びにこれらの酸の無水物及び低級アルキル(炭素数1〜3)エステル等が挙げられる。上記のような酸、これらの酸の無水物、及び酸のアルキルエステルを、本明細書では総称してカルボン酸化合物と呼ぶ。 Examples of the divalent or higher carboxylic acid compound include adipic acid, fumaric acid, maleic acid, succinic acid (for example, n-dodecenyl succinic acid, isododecenyl succinic acid, n-dodecyl succinic acid, isooctenyl succinic acid, Aliphatic carboxylic acids such as isooctyl succinic acid and the like, succinic acid substituted with alkyl groups having 1 to 20 carbon atoms or alkenyl groups having 2 to 20 carbon atoms, phthalic acid, isophthalic acid, terephthalic acid, 1,2, 4-Benzenetricarboxylic acid (trimellitic acid), 2,5,7-naphthalenetricarboxylic acid, aromatic carboxylic acids such as pyromellitic acid, anhydrides of these acids and lower alkyl (C1-3) esters, etc. Is mentioned. Such acids, anhydrides of these acids, and alkyl esters of these acids are collectively referred to herein as carboxylic acid compounds.
また、ポリエステルは、軟化点と分子量の観点から、アルコール成分及び／又はカルボン酸成分として3価以上のモノマーを用いて得られた架橋ポリエステルであることが好ましい。3価以上のモノマーの含有量は、アルコール成分及びカルボン酸成分の総量中、2〜20モル％が好ましく、4〜18モル％がより好ましい。3価以上のモノマーとしては、1,2,4-ベンゼントリカルボン酸（トリメリット酸）及びその無水物が好ましい。 The polyester is preferably a crosslinked polyester obtained using a trivalent or higher monomer as the alcohol component and / or carboxylic acid component from the viewpoint of the softening point and the molecular weight. The content of the trivalent or higher monomer is preferably 2 to 20 mol%, more preferably 4 to 18 mol% in the total amount of the alcohol component and the carboxylic acid component. As the trivalent or higher monomer, 1,2,4-benzenetricarboxylic acid (trimellitic acid) and its anhydride are preferable.
なお、アルコール成分には1価のアルコールが、カルボン酸成分には1価のカルボン酸化合物が、分子量調整や耐オフセット性向上の観点から、適宜含有されていてもよい。 The alcohol component may contain a monovalent alcohol, and the carboxylic acid component may contain a monovalent carboxylic acid compound as appropriate from the viewpoints of molecular weight adjustment and offset resistance improvement.
アルコール成分とカルボン酸成分との縮重合は、例えば、不活性ガス雰囲気中にて、要すればエステル化触媒を用いて、180〜250℃の温度で行うことができる。 The polycondensation of the alcohol component and the carboxylic acid component can be performed, for example, in an inert gas atmosphere at a temperature of 180 to 250 ° C. using an esterification catalyst if necessary.
なお、本発明において、ポリエステルは、実質的にその特性を損なわない程度に変性されたポリエステルであってもよい。変性されたポリエステルとしては、例えば、特開平１１−１３３６６８号公報、特開平１０−２３９９０３号公報、特開平８−２０６３６号公報等に記載の方法によりフェノール、ウレタン、エポキシ等によりグラフト化やブロック化したポリエステルをいう。 In the present invention, the polyester may be a polyester modified to such an extent that the characteristics are not substantially impaired. Examples of the modified polyester include grafting and blocking with phenol, urethane, epoxy and the like by the methods described in JP-A-11-133668, JP-A-10-239903, JP-A-8-20636, and the like. Polyester.
態様１のトナーは、かかる結着樹脂と着色剤、ベンジル酸誘導体の金属化合物、スチレン等を含むトナー原料組成物を用いて、溶融混練粉砕法等により製造することができる。 The toner of aspect 1 can be produced by a melt kneading and pulverizing method using a toner raw material composition containing such a binder resin and a colorant, a metal compound of a benzylic acid derivative, styrene and the like.
態様２のトナーは、スチレンの存在下で得られる結着樹脂、着色剤及びベンジル酸誘導体の金属化合物を含有する。 The toner according to aspect 2 contains a binder resin obtained in the presence of styrene, a colorant, and a metal compound of a benzylic acid derivative.
スチレンの存在下で得られる結着樹脂としては、スチレンを含む原料モノマーを用いて得られる付加重合系樹脂のみからなるものに限定されない。前記以外に、スチレンの存在下で得られる縮重合系樹脂、並びに縮重合系樹脂の原料モノマー及びスチレンを含む付加重合系樹脂の原料モノマーを用いて得られる複合樹脂が好ましい。これらの中では、スチレンの分散性の観点から、アルコール成分とカルボン酸成分とをスチレンの存在下で縮重合させて得られるポリエステル、アルコール成分とカルボン酸成分とを含むポリエステルの原料モノマー及びスチレンを含む付加重合系樹脂の原料モノマーを用いて得られる複合樹脂が好ましい。 The binder resin obtained in the presence of styrene is not limited to those consisting only of an addition polymerization resin obtained using a raw material monomer containing styrene. In addition to the above, a polycondensation resin obtained in the presence of styrene, and a composite resin obtained by using a raw material monomer of a condensation polymerization resin and a raw material monomer of an addition polymerization resin containing styrene are preferable. Among these, from the viewpoint of dispersibility of styrene, a polyester obtained by polycondensation of an alcohol component and a carboxylic acid component in the presence of styrene, a polyester raw material monomer containing the alcohol component and the carboxylic acid component, and styrene are used. The composite resin obtained using the raw material monomer of the addition polymerization resin to be contained is preferable.
付加重合系樹脂の原料モノマーとしては、スチレン、α-メチルスチレン等のスチレン化合物；エチレン、プロピレン等のエチレン性不飽和モノオレフィン類；ブタジエン等のジオレフィン類；塩化ビニル等のハロビニル類；酢酸ビニル、プロピオン酸ビニル等のビニルエステル類；(メタ)アクリル酸のアルキル(炭素数1〜18)エステル、(メタ)アクリル酸ジメチルアミノエチル等のエチレン性モノカルボン酸のエステル；ビニルメチルエーテル等のビニルエーテル類；ビニリデンクロリド等のビニリデンハロゲン化物；N-ビニルピロリドン等のN-ビニル化合物類等が挙げられ、これらの中では、スチレン以外に、重合反応の制御のし易さ及び安定性の観点から、エチレン性モノカルボン酸のエステルが好ましく、(メタ)アクリル酸のアルキル(炭素数1〜18)エステルがより好ましい。スチレンの含有量は、付加重合系樹脂の原料モノマー中、30〜95重量％が好ましく、60〜90重量％がより好ましい。 As raw material monomers for addition polymerization resins, styrene compounds such as styrene and α-methylstyrene; ethylenically unsaturated monoolefins such as ethylene and propylene; diolefins such as butadiene; halovinyls such as vinyl chloride; vinyl acetate Vinyl esters such as vinyl propionate; alkyl (1 to 18 carbon atoms) esters of (meth) acrylic acid; esters of ethylenic monocarboxylic acids such as dimethylaminoethyl (meth) acrylate; vinyl ethers such as vinyl methyl ether Vinylidene halides such as vinylidene chloride; N-vinyl compounds such as N-vinylpyrrolidone and the like. Among these, in addition to styrene, from the viewpoint of ease of control of the polymerization reaction and stability, Esters of ethylenic monocarboxylic acids are preferred, alkyl (meth) acrylic acid (carbon number 1-18) esters are more preferred. The content of styrene is preferably 30 to 95% by weight, more preferably 60 to 90% by weight, in the raw material monomer of the addition polymerization resin.
エチレン性モノカルボン酸のエステルの含有量は、分散性の観点から、付加重合系樹脂単量体中、5〜70重量％が好ましく、10〜40重量％がより好ましい。 The content of the ethylenic monocarboxylic acid ester is preferably 5 to 70% by weight and more preferably 10 to 40% by weight in the addition polymerization resin monomer from the viewpoint of dispersibility.
さらに、スチレンとエチレン性モノカルボン酸のエステルの総含有量は、付加重合系樹脂単量体中、70重量％以上が好ましく、80重量％以上がより好ましく、90重量％以上がさらに好ましい。 Furthermore, the total content of esters of styrene and ethylenic monocarboxylic acid is preferably 70% by weight or more, more preferably 80% by weight or more, and still more preferably 90% by weight or more in the addition polymerization resin monomer.
また、スチレンのエチレン性モノカルボン酸のエステルに対するモノマー比(スチレン／エチレン性モノカルボン酸のエステル)は、50／50〜95／5が好ましく、70／30〜95／5がより好ましい。 The monomer ratio of styrene to the ester of ethylenic monocarboxylic acid (styrene / ethylenic monocarboxylic acid ester) is preferably 50/50 to 95/5, more preferably 70/30 to 95/5.
なお、付加重合系樹脂の原料モノマーの付加重合には、重合開始剤、架橋剤等を必要に応じて使用してもよい。 In addition, a polymerization initiator, a crosslinking agent, or the like may be used as necessary for the addition polymerization of the raw material monomer of the addition polymerization resin.
付加重合反応は、例えば、重合開始剤、架橋剤等の存在下、有機溶媒存在下又は無溶媒下で、常法により行うことができるが、例えば、温度条件は、好ましくは110〜200℃、より好ましくは140〜170℃である。 The addition polymerization reaction can be performed by a conventional method, for example, in the presence of a polymerization initiator, a crosslinking agent, or the like, in the presence of an organic solvent or in the absence of a solvent. For example, the temperature condition is preferably 110 to 200 ° C., More preferably, it is 140-170 degreeC.
付加重合反応の際に用いられる有機溶媒としては、キシレン、トルエン、メチルエチルケトン、アセトン等が挙げられる。有機溶媒の使用量は、付加重合系樹脂単量体100重量部に対して、10〜50重量部程度が好ましい。 Examples of the organic solvent used in the addition polymerization reaction include xylene, toluene, methyl ethyl ketone, and acetone. The amount of the organic solvent used is preferably about 10 to 50 parts by weight with respect to 100 parts by weight of the addition polymerization resin monomer.
スチレンの存在下で得られる縮重合系樹脂としては、ポリエステル、ポリアミド、ポリエステル・ポリアミド等が挙げられるが、水とスチレンとの反応物との結合し易さの観点から、ポリエステルが好ましい。 Examples of the polycondensation resin obtained in the presence of styrene include polyester, polyamide, polyester / polyamide, and the like, and polyester is preferable from the viewpoint of ease of bonding with a reaction product of water and styrene.
ポリエステルは、アルコール成分とカルボン酸成分との縮重合をスチレンの存在下で行う以外は態様１と同様にして得られ、スチレンの使用量は、縮重合反応工程時におけるスチレンの揮発量を考慮すると、縮重合樹脂の全原料モノマー100重量部に対して、0.01〜0.5重量部が好ましく、0.05〜0.3重量部がより好ましい。 The polyester is obtained in the same manner as in Embodiment 1 except that the condensation polymerization of the alcohol component and the carboxylic acid component is performed in the presence of styrene, and the amount of styrene used is determined by considering the volatilization amount of styrene during the condensation polymerization reaction step. In addition, 0.01 to 0.5 parts by weight is preferable and 0.05 to 0.3 parts by weight is more preferable with respect to 100 parts by weight of all the raw material monomers of the condensation polymerization resin.
複合樹脂における縮重合系樹脂成分としては、ポリエステル、ポリアミド、ポリエステル・ポリアミド等が挙げられるが、水とスチレンとの反応物との結合し易さの観点から、ポリエステルが好ましい。従って、複合樹脂としては、ポリエステルユニットとスチレンを含むビニル系樹脂等の付加重合系樹脂ユニットを有する樹脂が好ましい。 Examples of the polycondensation resin component in the composite resin include polyester, polyamide, polyester / polyamide, and the like, but polyester is preferable from the viewpoint of ease of bonding with a reaction product of water and styrene. Accordingly, the composite resin is preferably a resin having a polyester unit and an addition polymerization resin unit such as a vinyl resin containing styrene.
ポリエステルユニットの原料モノマーとしては、態様１で挙げたアルコール成分とカルボン酸成分が同様に挙げられる。 Examples of the raw material monomer for the polyester unit include the alcohol component and the carboxylic acid component mentioned in Embodiment 1.
付加重合系樹脂ユニットの原料モノマーとしては、上記で挙げた成分が同様に挙げられる。 Examples of the raw material monomer of the addition polymerization resin unit include the same components as described above.
本発明において、複合樹脂は、微量のスチレンの含有量の制御の容易さの観点から、縮重合系樹脂の原料モノマーと付加重合系樹脂の原料モノマーに加えて、さらに縮重合系樹脂の原料モノマー及び付加重合系樹脂の原料モノマーのいずれとも反応し得る化合物(両反応性モノマー)を用いて得られる樹脂(ハイブリッド樹脂)であることが好ましい。ハイブリッド樹脂は、縮重合系樹脂成分と付加重合系樹脂成分とが部分的に両反応性モノマーを介して結合し、縮重合系樹脂成分中に付加重合系樹脂成分がより微細に、かつ均一に分散している。 In the present invention, from the viewpoint of easy control of the content of a small amount of styrene, in addition to the raw material monomer of the condensation polymerization resin and the raw material monomer of the addition polymerization resin, the composite resin further includes the raw material monomer of the condensation polymerization resin. And a resin (hybrid resin) obtained by using a compound capable of reacting with any of the raw material monomers of the addition polymerization resin (a bireactive monomer). In the hybrid resin, the condensation polymerization resin component and the addition polymerization resin component are partially bonded via the both reactive monomers, and the addition polymerization resin component is more finely and uniformly contained in the condensation polymerization resin component. Is distributed.
両反応性モノマーとしては、分子内に、水酸基、カルボキシル基、エポキシ基、第1級アミノ基及び第2級アミノ基からなる群より選ばれた少なくとも1種の官能基と、エチレン性不飽和結合とを有する化合物が好ましく、このような両反応性モノマーを用いることにより、分散相となる樹脂の分散性をより一層向上させることができる。両反応性モノマーの具体例としては、例えば、アクリル酸、フマル酸、メタクリル酸、シトラコン酸、マレイン酸、(メタ)アクリル酸２-ヒドロキシエチル、(メタ)アクリル酸グリシジル、及びこれらのカルボン酸の無水物、アルキル(炭素数1〜2)エステル等の誘導体等が挙げられ、これらのなかでは反応性の観点からアクリル酸、メタクリル酸、フマル酸、マレイン酸及びこれらのカルボン酸の誘導体が好ましい。 As the both reactive monomers, at least one functional group selected from the group consisting of a hydroxyl group, a carboxyl group, an epoxy group, a primary amino group and a secondary amino group in the molecule, and an ethylenically unsaturated bond A compound having the above formula is preferred, and by using such a bireactive monomer, the dispersibility of the resin to be the dispersed phase can be further improved. Specific examples of the both reactive monomers include, for example, acrylic acid, fumaric acid, methacrylic acid, citraconic acid, maleic acid, 2-hydroxyethyl (meth) acrylate, glycidyl (meth) acrylate, and carboxylic acids thereof. Derivatives such as anhydrides, alkyl (1 to 2 carbon atoms) esters and the like can be mentioned, and among these, acrylic acid, methacrylic acid, fumaric acid, maleic acid and derivatives of these carboxylic acids are preferable from the viewpoint of reactivity.
本発明において、両反応性モノマーのうち、官能基を2個以上有するモノマー(ポリカルボン酸等)及びその誘導体はポリエステルユニットの原料モノマーとして、官能基を1個有するモノマー(モノカルボン酸等)及びその誘導体は付加重合系樹脂ユニットの原料モノマーとして扱う。両反応性モノマーの使用量は、官能基を2個以上有するモノマー及びその誘導体については縮重合系樹脂単量体中、官能基を1個有するモノマー及びその誘導体については付加重合系樹脂単量体中、それぞれ1〜10モル％が好ましく、4〜8モル％がより好ましい。 In the present invention, among both reactive monomers, a monomer having two or more functional groups (polycarboxylic acid or the like) and a derivative thereof as a raw material monomer for the polyester unit, a monomer having one functional group (monocarboxylic acid or the like) and The derivative is treated as a raw material monomer for the addition polymerization resin unit. The amount of both reactive monomers used is a condensation polymerization resin monomer for monomers having two or more functional groups and derivatives thereof, and an addition polymerization resin monomer for monomers having one functional group and derivatives thereof. Among these, 1-10 mol% is preferable respectively, and 4-8 mol% is more preferable.
本発明において、複合樹脂は、縮重合反応と付加重合反応を同一反応容器中で並行して行うことにより得られるが、縮重合反応と付加重合反応の進行及び完結は、時間的に同時である必要はなく、それぞれの反応機構に応じて反応温度及び時間を適当に選択し、反応を進行、完結させればよい。縮重合反応及び付加重合反応は、前述の方法により行うことができる。 In the present invention, the composite resin is obtained by performing the condensation polymerization reaction and the addition polymerization reaction in parallel in the same reaction vessel, but the progress and completion of the condensation polymerization reaction and the addition polymerization reaction are simultaneous in time. It is not necessary, and the reaction temperature and time may be appropriately selected according to each reaction mechanism to advance and complete the reaction. The condensation polymerization reaction and the addition polymerization reaction can be performed by the above-described methods.
また、複合樹脂は、残存スチレン量を効率よく調整する観点から、少なくとも後述の工程（Ａ）及び（Ｂ）を経て製造することができる。 Moreover, a composite resin can be manufactured through the below-mentioned process (A) and (B) from a viewpoint of adjusting the amount of residual styrene efficiently.
即ち、スチレンを含む付加重合系樹脂単量体を付加重合反応させる工程(Ａ)、(Ａ)の途中及び／又は終了後に、工程(Ａ)で生じる反応混合物と水とを混合する工程(Ｂ)、並びに工程(Ａ)及び工程(Ｂ)の前、中及び後の少なくともいずれかの時点で、さらに縮重合系樹脂単量体を前記の反応系に存在させて縮重合反応させる工程(Ｃ)を経て得ることもできる。 That is, the step (B) of mixing the reaction mixture produced in step (A) with water after and / or after the steps (A) and (A) of subjecting the addition polymerization resin monomer containing styrene to an addition polymerization reaction (B ), And at least one of the time point before, during and after step (A) and step (B), a step (C) in which a condensation polymerization resin monomer is further present in the reaction system (C ) Can also be obtained.
水の混合量は、樹脂の物性への影響を制御する観点から、付加重合系樹脂単量体100重量部に対して、0.1〜50重量部が好ましく、0.5〜40重量部がより好ましく、1〜35重量部がさらに好ましい。 The mixing amount of water is preferably 0.1 to 50 parts by weight, more preferably 0.5 to 40 parts by weight with respect to 100 parts by weight of the addition polymerization resin monomer, from the viewpoint of controlling the influence on the physical properties of the resin. More preferred is ~ 35 parts by weight.
工程(Ａ)で生じる反応混合物と水とを混合する際の系内の温度は、水の蒸発効率及び反応混合物の粘度の観点から、100〜300℃が好ましく、130〜250℃がより好ましく、150〜240℃がさらに好ましい。 The temperature in the system when mixing the reaction mixture produced in step (A) and water is preferably 100 to 300 ° C, more preferably 130 to 250 ° C, from the viewpoint of the evaporation efficiency of water and the viscosity of the reaction mixture. 150 to 240 ° C. is more preferable.
工程(Ａ)で生ずる反応混合物と水とを接触及び／又は混合する方法は特に限定されないが、水との共沸効果により、スチレン量を効率よく調整する観点から、かかる反応混合物に水を滴下したり、蒸気を添加したりする方法が好ましい。水は、混合後蒸発するが、樹脂中の含水量は、トナーの帯電特性の観点から、0.2重量％以下が好ましく、含水量を低減する方法としては、水の混合終了後、100℃以上で保持する、又は減圧により除去する等の方法が好ましい。 The method of contacting and / or mixing the reaction mixture produced in step (A) and / or water is not particularly limited, but water is added dropwise to the reaction mixture from the viewpoint of efficiently adjusting the amount of styrene due to the azeotropic effect with water. Or a method of adding steam is preferable. Although water evaporates after mixing, the water content in the resin is preferably 0.2% by weight or less from the viewpoint of the charging characteristics of the toner. A method for reducing the water content is 100 ° C. or higher after completion of water mixing. A method of holding or removing by reduced pressure is preferable.
工程(Ａ)と工程(Ｂ)は、それぞれ別々に行う必要はなく、両工程を一部並行して行ってもよい。従って、反応混合物と水とを混合する時期は、工程(Ａ)における付加重合反応の終了後であっても、付加重合反応の途中であってもよいが、本発明では、水と樹脂との混合性の観点から、工程(Ａ)における付加重合反応が終了した後に水を添加することが好ましい。付加重合反応の進行度は、使用した開始剤の半減期、反応熱量等から予測、確認することができる。 The step (A) and the step (B) do not have to be performed separately, and both steps may be partially performed in parallel. Therefore, the timing of mixing the reaction mixture and water may be after the addition polymerization reaction in step (A) or in the middle of the addition polymerization reaction. From the viewpoint of mixing properties, it is preferable to add water after the addition polymerization reaction in step (A) is completed. The progress of the addition polymerization reaction can be predicted and confirmed from the half-life of the initiator used, the heat of reaction, and the like.
複合樹脂の製造方法における、工程の手順としては、
ｉ）縮重合反応を行う工程（Ｃ）の後に、工程（Ａ）を行う方法、
ii）縮重合反応を行う工程（Ｃ）を、工程（Ａ）に先立って開始し、工程（Ａ）の後に、再度反応温度を上昇させ、必要に応じて架橋剤となる３価以上の縮重合系樹脂単量体を重合系に添加し、工程（Ｃ）の縮重合反応をさらに進める方法、
iii)付加重合反応に適した温度条件下で付加重合反応を行う工程（Ａ）と縮重合反応を行う工程（Ｃ）を並行して行い、反応温度を前記条件下で保持して工程（Ａ）を完結させた後、反応温度を上昇させ、必要に応じて架橋剤となる３価以上の縮重合系樹脂単量体を重合系に添加し、工程（Ｃ）の縮重合反応をさらに進める方法、
等が挙げられる。これらの方法において、工程（Ｂ）の実施は前記のように工程（Ａ）の開始後であればよいが、工程（Ａ）の終了後であることが好ましく、工程（Ａ）及び工程（Ｃ）の終了後であることがより好ましい。また、iii)の方法において、工程（Ａ）と工程（Ｃ）を並行して行う際には、縮重合系樹脂単量体を含有した混合物中に、付加重合系樹脂単量体を含有した混合物を滴下して反応させることが好ましい。このように反応容器中で独立した２つの重合反応を並行して進行させる方法により２種類の樹脂成分が効果的に混合分散した複合樹脂を得ることができる。
As a procedure of the process in the manufacturing method of the composite resin,
i) a method of performing the step (A) after the step (C) of performing the condensation polymerization reaction;
ii) The step (C) for conducting the polycondensation reaction is started prior to the step (A), and after the step (A), the reaction temperature is increased again, and if necessary, a trivalent or higher polycondensation that becomes a crosslinking agent is performed. A method in which a polymerization resin monomer is added to the polymerization system, and the condensation polymerization reaction in the step (C) is further advanced,
iii) The step (A) for carrying out the addition polymerization reaction under the temperature conditions suitable for the addition polymerization reaction and the step (C) for carrying out the condensation polymerization reaction are carried out in parallel, and the reaction temperature is maintained under the above conditions. ) Is completed, the reaction temperature is increased, and if necessary, a tri- or higher polycondensation resin monomer serving as a cross-linking agent is added to the polymerization system to further advance the polycondensation reaction in step (C). Method,
Etc. In these methods, the step (B) may be performed after the start of the step (A) as described above, but is preferably after the end of the step (A), and the steps (A) and (C) More preferably after the end of). In the method iii), when the step (A) and the step (C) are performed in parallel, the addition polymerization resin monomer is contained in the mixture containing the condensation polymerization resin monomer. It is preferable that the mixture is dropped and reacted. In this way, a composite resin in which two types of resin components are effectively mixed and dispersed can be obtained by a method in which two independent polymerization reactions proceed in parallel in a reaction vessel.
また、複合樹脂が両反応性モノマーを用いて得られるハイブリッド樹脂である場合にも、両反応性モノマーを縮重合系樹脂の原料モノマー及び／又は付加重合系樹脂の原料モノマーと共に用い、好ましくは付加重合系樹脂の原料モノマーと共に用いて、上記工程（Ａ）〜（Ｃ）を経て得ることができる。 Also, when the composite resin is a hybrid resin obtained by using an amphoteric monomer, the amphoteric monomer is used together with a raw material monomer for a condensation polymerization resin and / or a raw material monomer for an addition polymerization resin, preferably an addition monomer. It can be obtained through the above-mentioned steps (A) to (C) by using together with the raw material monomer of the polymerization resin.
定着性を向上させる観点からは、本発明のトナーには離型剤を含有させることが好ましく、ワックスの分散性を向上させる観点からは、複合樹脂は、ワックスの存在下で縮重合系樹脂の原料モノマー及びスチレンを含む付加重合系樹脂の原料モノマーを重合させることにより得られる樹脂が好ましい。 From the viewpoint of improving the fixability, the toner of the present invention preferably contains a release agent. From the viewpoint of improving the dispersibility of the wax, the composite resin is a polycondensation resin in the presence of the wax. A resin obtained by polymerizing a raw material monomer of an addition polymerization resin containing a raw material monomer and styrene is preferable.
ワックスとしては、低分子量ポリプロピレン、低分子量ポリエチレン、低分子量ポリプロピレンポリエチレン共重合体、マイクロクリスタリンワックス、パラフィンワックス、フィッシャートロプシュワックス等の脂肪族炭化水素系ワックス及びそれらの酸化物、カルナウバワックス、モンタンワックス、サゾールワックス及びそれらの脱酸ワックス等のエステル系ワックス、脂肪酸アミド類、脂肪酸類、高級アルコール類、脂肪酸金属塩等が挙げられ、これらのなかでは、離型性及び安定性の観点から、脂肪族炭化水素系ワックスが好ましい。 Examples of the wax include aliphatic hydrocarbon waxes such as low molecular weight polypropylene, low molecular weight polyethylene, low molecular weight polypropylene polyethylene copolymer, microcrystalline wax, paraffin wax, and Fischer-Tropsch wax, and oxides thereof, carnauba wax, and montan wax. , Ester waxes such as sazol wax and their deoxidized wax, fatty acid amides, fatty acids, higher alcohols, fatty acid metal salts, etc., among these, from the viewpoint of releasability and stability, Aliphatic hydrocarbon waxes are preferred.
ワックスの添加量は、結着樹脂の製造に用いられる樹脂単量体の総量100重量部に対して、20重量部以下が好ましく、10重量部以下がより好ましい。 The amount of the wax added is preferably 20 parts by weight or less, and more preferably 10 parts by weight or less with respect to 100 parts by weight of the total amount of resin monomers used in the production of the binder resin.
ワックスの添加時期は特に限定されず、重合開始当初であっても、重合反応途中であってもよい。 The addition timing of the wax is not particularly limited, and may be at the beginning of the polymerization or in the middle of the polymerization reaction.
本発明においては、縮重合系樹脂の付加重合系樹脂に対する重量比、即ち縮重合系樹脂の原料モノマーの付加重合系樹脂の原料モノマーに対する重量比(縮重合系樹脂の原料モノマー／付加重合系樹脂の原料モノマー)は、連続相が縮重合系樹脂であり、分散相が付加重合系樹脂であることが好ましいことから、55／45〜95／5が好ましく、60／40〜95／5がより好ましく、70／30〜90／10がさらに好ましい。 In the present invention, the weight ratio of the condensation polymerization resin to the addition polymerization resin, that is, the weight ratio of the condensation polymerization resin raw material monomer to the addition polymerization resin raw material monomer (condensation polymerization resin raw material monomer / addition polymerization resin). The raw material monomer) is preferably 55/45 to 95/5, more preferably 60/40 to 95/5, since the continuous phase is preferably a condensation polymerization resin and the dispersed phase is an addition polymerization resin. 70/30 to 90/10 is more preferable.
態様２の結着樹脂は、本発明の効果を損なわない範囲で、さらに、エポキシ樹脂、ポリカーボネート、ポリウレタン、スチレン−アクリル樹脂等の他の結着樹脂を含有していてもよい。 The binder resin of aspect 2 may further contain other binder resins such as epoxy resin, polycarbonate, polyurethane, and styrene-acrylic resin as long as the effects of the present invention are not impaired.
態様２の結着樹脂中のスチレン含有量は、ベンジル酸誘導体のトナーからの分離抑制の観点から、好ましくは3〜100ppmであり、より好ましくは3〜80ppmであり、さらに好ましくは5〜60ppmである。特に、前記方法により得られる結着樹脂は、結着樹脂中のスチレン量が効率よく調整された樹脂となる。なお、本明細書において、スチレンの含有量は、後述の実施例に記載の方法により測定される。 The styrene content in the binder resin of aspect 2 is preferably 3 to 100 ppm, more preferably 3 to 80 ppm, and further preferably 5 to 60 ppm from the viewpoint of suppressing separation of the benzylic acid derivative from the toner. is there. In particular, the binder resin obtained by the above method is a resin in which the amount of styrene in the binder resin is efficiently adjusted. In addition, in this specification, content of styrene is measured by the method as described in the below-mentioned Example.
態様１及び２の結着樹脂の軟化点は、低温定着性、定着可能領域及び保存性の観点から、好ましくは70〜170℃、より好ましくは80〜150℃、さらに好ましくは80〜140℃、さらに好ましくは90〜130℃である。また、態様１及び２の結着樹脂のガラス転移点は40〜80℃が好ましく、酸価は10〜35mgKOH／gが好ましい。本明細書において、軟化点、ガラス転移点、酸価は、後述の実施例に記載の方法により測定される。 The softening point of the binder resin of Embodiments 1 and 2 is preferably 70 to 170 ° C., more preferably 80 to 150 ° C., further preferably 80 to 140 ° C., from the viewpoints of low-temperature fixability, fixable area, and storage stability. More preferably, it is 90-130 degreeC. Further, the glass transition point of the binder resin of Embodiments 1 and 2 is preferably 40 to 80 ° C., and the acid value is preferably 10 to 35 mg KOH / g. In the present specification, the softening point, glass transition point, and acid value are measured by the methods described in the examples described later.
本発明において、着色剤としては、トナー用着色剤として用いられる染料、顔料などのすべてが使用可能であり、カーボンブラック；Ｃ．Ｉ．ピグメント・イエロー1、同3、同74、同97、同98等のアセト酢酸アリールアミド系モノアゾ黄色顔料；Ｃ．Ｉ．ピグメント・イエロー12、同13、同14、同17等のアセト酢酸アリールアミド系ジスアゾ黄色顔料；Ｃ．Ｉ．ピグメント・イエロー93、同95などのポリアゾ系黄色顔料；Ｃ．Ｉ．ピグメント・イエロー180；Ｃ．Ｉ．ピグメント・イエロー185；Ｃ．Ｉ．ソルベント・イエロー19、同77、同79、Ｃ．Ｉ．ディスパース・イエロー164等の黄色染料；Ｃ．Ｉ．ピグメント・レッド48、同49：1、同53：1、同57、同57：1、同81、同122、同184、同5等の赤色もしくは紅色顔料；Ｃ．Ｉ．ソルベント・レッド49、同52、同58、同8等の赤色系染料；Ｃ．Ｉ．ピグメント・ブルー15：3等の銅フタロシアニン及びその誘導体の青色系染顔料；Ｃ．Ｉ．ピグメント・グリーン7、同36（フタロシアニン・グリーン）等の緑色顔料等が挙げられ、これらは、単独で用いても2種以上混合して用いることができ、本発明のトナーは、黒トナー、モノカラートナー、フルカラートナーのいずれであっても良い。着色剤の含有量は、結着樹脂100重量部に対して、1〜15重量部が好ましく、2〜10重量部がより好ましい。 In the present invention, as the colorant, any of dyes and pigments used as toner colorants can be used, and carbon black; I. C.I. Pigment Yellow 1, 3, 74, 97, 98, etc. acetoacetic acid arylamide monoazo yellow pigments; I. C.I. Pigment Yellow 12, 13, 14, 17, etc. acetoacetic acid arylamide disazo yellow pigments; I. Pigment Yellow 93, 95, and other polyazo yellow pigments; C.I. I. Pigment yellow 180; C.I. I. Pigment yellow 185; C.I. I. Solvent Yellow 19, 77, 79, C.I. I. Yellow dyes such as disperse yellow 164; I. CI Pigment Red 48, 49: 1, 53: 1, 57, 57: 1, 81, 122, 184, 5 and the like; I. Red dyes such as Solvent Red 49, 52, 58, 8; I. Blue dyes and pigments of copper phthalocyanine and its derivatives such as CI Pigment Blue 15: 3; I. Pigment Green 7 and 36 (phthalocyanine green), and the like. These may be used alone or as a mixture of two or more thereof. Either color toner or full color toner may be used. The content of the colorant is preferably 1 to 15 parts by weight and more preferably 2 to 10 parts by weight with respect to 100 parts by weight of the binder resin.
また、ベンジル酸誘導体の金属化合物は無色の化合物であり、着色性が要求されるカラートナー、特に、イエロートナーにも好適に使用される。そこで、イエロートナーにおいては、本発明の効果が顕著に表れやすい観点から、式(II): Further, the metal compound of the benzylic acid derivative is a colorless compound, and is suitably used for color toners that require colorability, particularly yellow toners. Therefore, in the yellow toner, from the viewpoint that the effect of the present invention is likely to appear remarkably, the formula (II):
で表されるＣ．Ｉ．ピグメント・イエロー180が好ましい。 C. I. Pigment Yellow 180 is preferable.
本発明において、ベンジル酸誘導体の金属化合物としては、帯電性の観点から、式(III)： In the present invention, the metal compound of the benzylic acid derivative is represented by the formula (III):
（式中、Ｍはホウ素又はアルミニウム、ｍは2以上の整数、ｎは1以上の整数を示す）
で表される陰イオンを含む化合物が好ましい。該陰イオンの対イオンとしては、カリウム、ナトリウム、リチウム等が挙げられる。なお、かかる金属化合物は、金属塩または金属錯体のいずれであってもよい。
(In the formula, M is boron or aluminum, m is an integer of 2 or more, and n is an integer of 1 or more)
The compound containing the anion represented by these is preferable. Examples of the counter ion of the anion include potassium, sodium, lithium and the like. Such a metal compound may be either a metal salt or a metal complex.
ベンジル酸誘導体の金属化合物の市販品としては、「LR-147」(Ｍ：ホウ素、対イオン：カリウム、日本カーリット社製)等が挙げられる。 Examples of commercially available metal compounds of benzylic acid derivatives include “LR-147” (M: boron, counter ion: potassium, manufactured by Nippon Carlit).
ベンジル酸誘導体の金属化合物の含有量は、結着樹脂100重量部に対して、帯電の立ち上がり性を向上させるために、0.3重量部以上が好ましく、荷電制御剤の導電性による帯電量の低下を防止するために、3重量部以下が好ましく、より好ましくは0.5〜2重量部である。 The content of the metal compound of the benzylic acid derivative is preferably 0.3 parts by weight or more with respect to 100 parts by weight of the binder resin in order to improve the charge rising property, and the charge amount is reduced by the conductivity of the charge control agent. In order to prevent this, the amount is preferably 3 parts by weight or less, more preferably 0.5 to 2 parts by weight.
さらに、本発明のトナーは、本発明の効果を損なわない範囲で、式（II）で表されるベンジル酸誘導体の金属化合物以外の他の荷電制御剤を含有していてもよい。他の荷電制御剤としては、3級アミンを側鎖として含有するトリフェニルメタン系染料、4級アンモニウム塩化合物、ポリアミン樹脂、イミダゾール誘導体等の正帯電性荷電制御剤及びベンジル酸のホウ素錯体等の負帯電性荷電制御剤が挙げられるが、本発明の目的である高い帯電性を得るためには、荷電制御剤中の式（II）で表されるベンジル酸誘導体の金属化合物の含有量は、70重量％以上が好ましく、80重量％以上がより好ましく、90重量％がさらに好ましく、実質的に100重量％であることがさらに好ましい。 Furthermore, the toner of the present invention may contain a charge control agent other than the metal compound of the benzylic acid derivative represented by the formula (II) as long as the effects of the present invention are not impaired. Other charge control agents include triphenylmethane dyes containing tertiary amines as side chains, quaternary ammonium salt compounds, polyamine resins, positive charge control agents such as imidazole derivatives, and boron complexes of benzylic acid. Although a negatively chargeable charge control agent can be mentioned, in order to obtain the high chargeability that is the object of the present invention, the content of the metal compound of the benzylic acid derivative represented by the formula (II) in the charge control agent is: It is preferably 70% by weight or more, more preferably 80% by weight or more, still more preferably 90% by weight, and still more preferably substantially 100% by weight.
本発明のトナーには、さらに、離型剤、磁性粉、流動性向上剤、導電性調整剤、体質顔料、繊維状物質等の補強充填剤、酸化防止剤、老化防止剤、クリーニング性向上剤等の添加剤が適宜含有されていてもよい。 The toner of the present invention further includes a release agent, magnetic powder, fluidity improver, conductivity modifier, extender pigment, reinforcing filler such as fibrous substance, antioxidant, anti-aging agent, and cleaning property improver. Such additives may be appropriately contained.
離型剤としては、前述したものが同様に挙げられる。これらのなかでは、離型性及び安定性の観点から、脂肪族炭化水素系ワックス及びエステル系ワックスが好ましく、これらは単独で又は2種以上を混合して含有されていても良い。離型剤の含有量は、結着樹脂100重量部に対して、0.1〜20重量部が好ましく、0.5〜10重量部がより好ましい。離型剤は分散性向上の観点から、結着樹脂製造時に樹脂の原料モノマーと共に用いられ、結着樹脂に内添されていてもよい。 Examples of the release agent include those described above. Among these, aliphatic hydrocarbon waxes and ester waxes are preferable from the viewpoint of releasability and stability, and these may be contained alone or in admixture of two or more. The content of the release agent is preferably 0.1 to 20 parts by weight and more preferably 0.5 to 10 parts by weight with respect to 100 parts by weight of the binder resin. From the viewpoint of improving dispersibility, the release agent may be used together with the resin raw material monomer during the production of the binder resin, and may be internally added to the binder resin.
本発明のトナーは、結着樹脂、着色剤、ベンジル酸誘導体の金属化合物、態様１においてはさらにスチレン等を含むトナー原料組成物を用い、溶融混練粉砕法、転相乳化法、乳化分散法、懸濁重合法等の従来公知のいずれの方法により製造されるものであってもよいが、生産性や着色剤の分散性の観点から、溶融混練粉砕法により製造することが好ましい。例えば、溶融混練粉砕法による場合、結着樹脂等のトナー原料組成物をヘンシェルミキサー等の混合機で均一に混合した後、密閉式ニーダー又は1軸もしくは2軸の押出機等で溶融混練する工程、得られた溶融混練物を必要に応じて粉砕が可能となるまで冷却した後、粉砕・分級する工程を含む方法によりトナーを製造することができる。 The toner of the present invention uses a toner raw material composition containing a binder resin, a colorant, a metal compound of a benzylic acid derivative, and styrene and the like in the first embodiment. Although it may be produced by any conventionally known method such as a suspension polymerization method, it is preferably produced by a melt-kneading pulverization method from the viewpoint of productivity and dispersibility of the colorant. For example, in the case of the melt-kneading pulverization method, a toner raw material composition such as a binder resin is uniformly mixed with a mixer such as a Henschel mixer, and then melt-kneaded with a closed kneader or a single-screw or twin-screw extruder The obtained melt-kneaded product is cooled until it can be pulverized, if necessary, and then a toner can be produced by a method including a step of pulverizing and classifying.
また、前記溶融混練粉砕方法によりトナーを製造する際には、生産効率の観点から、粉砕・分級工程で得られた微粉(回収微粉)を、溶融混練工程に供するトナー原料組成物がさらに含有することが好ましい。本発明に用いられる回収微粉は、粉砕・分級工程で発生した微粉であり、分級工程において、所望の粒径よりも小粒径側の微粉を除去するための下限分級により除去された微粉であることが好ましい。かかる回収微粉は、再度溶融混練し、チップ化して使用してもよいが、回収微粉をそのまま再利用することが好ましい。 Further, when the toner is produced by the melt kneading and pulverizing method, from the viewpoint of production efficiency, the toner raw material composition used for the melt kneading step further contains the fine powder (collected fine powder) obtained in the pulverizing / classifying step. It is preferable. The recovered fine powder used in the present invention is a fine powder generated in the pulverization / classification process, and is a fine powder removed in the classification process by the lower limit classification for removing fine powder on the smaller particle size side than the desired particle size. It is preferable. Such recovered fine powder may be melt-kneaded again to form a chip, but it is preferable to reuse the recovered fine powder as it is.
従来、回収微粉を再利用する場合においては、回収微粉中のベンジル酸誘導体の量と、トナー原料中のベンジル酸誘導体の量が異なるために、回収微粉を使用したトナーの安定した品質を得ることが困難であった。しかし、本発明のトナーでは、ベンジル酸誘導体とスチレンを含有しているために、ベンジル酸誘導体と結着樹脂の結びつきが強くなる結果、粉砕工程でのベンジル酸誘導体のトナーからの分離が抑制されるためか、回収微粉を使用した場合においても安定した高品質のトナーを得ることができる。 Conventionally, when the recovered fine powder is reused, the amount of the benzylic acid derivative in the recovered fine powder is different from the amount of the benzylic acid derivative in the toner raw material, so that a stable quality of the toner using the recovered fine powder is obtained. It was difficult. However, since the toner of the present invention contains a benzylic acid derivative and styrene, the bond between the benzylic acid derivative and the binder resin is strengthened. As a result, separation of the benzylic acid derivative from the toner in the pulverization process is suppressed. For this reason, a stable and high-quality toner can be obtained even when the recovered fine powder is used.
回収微粉の含有量は、分散性及び生産性の観点から、回収微粉を添加する前のトナー原料組成物100重量部に対して、5〜35重量部が好ましく、10〜30重量部がより好ましい。 The content of the recovered fine powder is preferably 5 to 35 parts by weight, more preferably 10 to 30 parts by weight with respect to 100 parts by weight of the toner raw material composition before adding the recovered fine powder from the viewpoint of dispersibility and productivity. .
本発明のトナーは、さらに、必要に応じて外添剤により表面処理する工程を経て得ることもできる。表面処理は、疎水性シリカ等の流動性向上剤等の外添剤をヘンシェルミキサー等の混合機によりトナー表面に外添する方法が好ましい。外添剤としては、表面を疎水化処理したシリカ微粒子、酸化チタン微粒子、アルミナ微粒子、酸化セリウム微粒子、カーボンブラック等の無機微粒子やポリカーボネート、ポリメチルメタクリレート、シリコーン樹脂等のポリマー微粒子等、公知の微粒子が使用できる。 The toner of the present invention can also be obtained through a step of surface treatment with an external additive as necessary. The surface treatment is preferably performed by externally adding an external additive such as a fluidity improver such as hydrophobic silica to the toner surface with a mixer such as a Henschel mixer. External additives include known fine particles such as silica fine particles, titanium fine particles, alumina fine particles, cerium oxide fine particles, carbon black and other inorganic fine particles, and polymer fine particles such as polycarbonate, polymethyl methacrylate and silicone resin. Can be used.
本発明のトナーの体積中位粒径(D50)は、画質及び帯電性の観点から、2〜15μmが好ましく、2〜10μmがより好ましく、2.5〜7μmがさらに好ましく、2.5〜6μmがさらに好ましい。なお、本明細書において、体積中位粒径(D50)とは、体積分率で計算した累積体積頻度が粒径の小さい方から計算して50％になる粒径を意味する。 The volume median particle size (D 50 ) of the toner of the present invention is preferably 2 to 15 μm, more preferably 2 to 10 μm, further preferably 2.5 to 7 μm, and further preferably 2.5 to 6 μm from the viewpoint of image quality and chargeability. . In the present specification, the volume median particle size (D 50 ) means a particle size at which the cumulative volume frequency calculated by the volume fraction is 50% when calculated from the smaller particle size.
本発明のトナーは、そのまま一成分現像用トナーとして、又はキャリアと混合して二成分現像剤として用いることができる。 The toner of the present invention can be used as a one-component developing toner as it is or as a two-component developer by mixing with a carrier.
〔樹脂の軟化点〕
フローテスター(島津製作所、CFT-500D)を用い、1gの試料を昇温速度6℃／分で加熱しながら、プランジャーにより1.96MPaの荷重を与え、直径1mm、長さ1mmのノズルから押出した。温度に対し、フローテスターのプランジャー降下量をプロットし、試料の半量が流出した温度を軟化点とする。
[Softening point of resin]
Using a flow tester (Shimadzu Corporation, CFT-500D), a 1 g sample was heated at a heating rate of 6 ° C / min, and a load of 1.96 MPa was applied by a plunger and extruded from a nozzle with a diameter of 1 mm and a length of 1 mm. . The amount of plunger drop of the flow tester is plotted against the temperature, and the temperature at which half of the sample flows out is taken as the softening point.
〔樹脂のガラス転移点〕
示差走査熱量計(セイコー電子工業社製、DSC210)を用いて200℃まで昇温し、その温度から降温速度10℃／分で0℃まで冷却したサンプルを昇温速度10℃／分で昇温し、吸熱の最高ピーク温度以下のベースラインの延長線とピークの立ち上がり部分からピークの頂点までの最大傾斜を示す接線との交点の温度とする。
[Glass transition point of resin]
Using a differential scanning calorimeter (Seiko Denshi Kogyo Co., Ltd., DSC210), the temperature was raised to 200 ° C, and the sample was cooled to 0 ° C at a temperature drop rate of 10 ° C / min. The temperature at the intersection of the extended line of the baseline below the maximum peak temperature of endotherm and the tangent line indicating the maximum slope from the peak rising portion to the peak apex.
〔樹脂の酸価〕
JIS K0070の方法に基づき測定する。但し、測定溶媒のみJIS K0070の規定のエタノールとエーテルの混合溶媒から、アセトンとトルエンの混合溶媒(アセトン:トルエン＝1:1(容量比))に変更した。
[Acid value of the resin]
Measured according to the method of JIS K0070. However, only the measurement solvent was changed from the mixed solvent of ethanol and ether specified in JIS K0070 to the mixed solvent of acetone and toluene (acetone: toluene = 1: 1 (volume ratio)).
〔離型剤の融点〕
示差走査熱量計(セイコー電子工業社製、DSC210)を用いて200℃まで昇温し、その温度から降温速度10℃／分で0℃まで冷却したサンプルを昇温速度10℃／分で昇温し、融解熱の最大ピーク温度を融点とする。
[Melting point of release agent]
Using a differential scanning calorimeter (Seiko Denshi Kogyo Co., Ltd., DSC210), the temperature was raised to 200 ° C, and the sample was cooled to 0 ° C at a temperature drop rate of 10 ° C / min. The maximum peak temperature of heat of fusion is taken as the melting point.
〔トナーの体積中位粒径（D50）〕
測定機：コールターマルチサイザーII（ベックマンコールター社製）
アパチャー径：100μm
解析ソフト：コールターマルチサイザーアキュコンプ バージョン 1.19（ベックマンコールター社製）
電解液：アイソトンII（ベックマンコールター社製）
分散液：エマルゲン109Ｐ（花王社製、ポリオキシエチレンラウリルエーテル、HLB：13.6）を5重量％の濃度となるよう前記電解液に溶解させて分散液を得る。
分散条件：前記分散液5mLに測定試料10mgを添加し、超音波分散機にて1分間分散させ、その後、電解液25mLを添加し、さらに、超音波分散機にて1分間分散させて、試料分散液を調製する。
測定条件：前記試料分散液を前記電解液100mLに加えることにより、3万個の粒子の粒径を20秒で測定できる濃度に調整した後、3万個の粒子を測定し、その粒度分布から体積中位粒径（D50）を求める。
[Volume-median particle size of toner (D 50 )]
Measuring machine: Coulter Multisizer II (Beckman Coulter, Inc.)
Aperture diameter: 100μm
Analysis software: Coulter Multisizer AccuComp version 1.19 (Beckman Coulter)
Electrolyte: Isoton II (Beckman Coulter, Inc.)
Dispersion: Emulgen 109P (manufactured by Kao Corporation, polyoxyethylene lauryl ether, HLB: 13.6) is dissolved in the electrolytic solution to a concentration of 5% by weight to obtain a dispersion.
Dispersion conditions: 10 mg of a measurement sample is added to 5 mL of the above dispersion, and dispersed for 1 minute with an ultrasonic disperser, then 25 mL of electrolyte is added, and further dispersed for 1 minute with an ultrasonic disperser. Prepare a dispersion.
Measurement conditions: By adding the sample dispersion to 100 mL of the electrolytic solution, the particle size of 30,000 particles is adjusted to a concentration that can be measured in 20 seconds, and then 30,000 particles are measured, Determine the volume-median particle size (D 50 ).
〔スチレン含有量〕
スチレンの含有量は、TD−GC/MS（加熱脱着-ガスクロマトグラフ質量分析計）を用いて、以下の方法により測定する。
(1) 測定装置
TD：Turbo Matrix ATD（自動加熱脱着(ATD)装置、Perkin Elmer社製)
GC：6890N(Agilent Technologies社製)
MS：5973N(Agilent Technologies社製)
(2) 測定条件
<TD>
出口スプリット使用
分析モード：2段階脱着
注入：2回
チューブからの加熱脱着条件：120℃で1時間
トラップ管への吸着条件：-30℃で50分
トラップ管からの脱着条件：-30℃から開始し、40℃／minで300℃まで昇温
パージ時間：1分
バルブ温度：150℃
トランスファー温度：160℃
カラム圧力：150kPa
入口スプリット：50mL／min
出口スプリット：5mL／min
脱着：50mL／min
<GC>
分析カラム：HP5-MS（60m×250μm×0．25μm）
キャリアー：He
流量条件：1mL/min
注入口温度：250℃
カラム圧力：150kPa(TDから制御)
オーブン温度条件：<temperature time (ratio)>
40℃ 3min
70℃ （2℃／min）
150℃ （5℃／min）
300℃ （10℃／min）
<MS>
イオン化法：EI(電子イオン化)法
インターフェイス温度：300℃
イオン源温度：230℃
四重極温度：150℃
検出モード：Scan (range m/z = 40-460)
Initial Area Reject：0
Initial Peak Width：0.097
Shoulder Detection：off
Initial Threshold：12.0
(3) スチレンの定量
テナックスTA入りチューブに標品「重トルエン／メタノール溶液(10mg/L)」を5μL注入する。次に、試料5mgを秤量し、上記チューブに添加する。その後、チューブを測定装置にセットし、測定を行う。なお、定量は一点検量で行い、重トルエンはm/z=98、スチレンはm/z=104のマスクロマトグラムのピークについてピーク面積を測定し、得られたピーク面積比よりスチレン濃度を求める。
[Styrene content]
The styrene content is measured by the following method using TD-GC / MS (thermal desorption-gas chromatograph mass spectrometer).
(1) Measuring equipment
TD: Turbo Matrix ATD (Automatic Heating Desorption (ATD) device, manufactured by Perkin Elmer)
GC: 6890N (Agilent Technologies)
MS: 5973N (Agilent Technologies)
(2) Measurement conditions
<TD>
Use outlet split Analysis mode: 2-stage desorption Injection: 2 times Heat desorption condition from tube: 1 hour at 120 ° C Adsorption condition to trap tube: 50 minutes at -30 ° C Desorption condition from trap tube: start from -30 ° C The temperature is raised to 300 ° C at 40 ° C / min. Purge time: 1 minute Valve temperature: 150 ° C
Transfer temperature: 160 ° C
Column pressure: 150kPa
Inlet split: 50mL / min
Outlet split: 5mL / min
Desorption: 50mL / min
<GC>
Analytical column: HP5-MS (60m × 250μm × 0.25μm)
Carrier: He
Flow rate condition: 1mL / min
Inlet temperature: 250 ° C
Column pressure: 150kPa (controlled from TD)
Oven temperature condition: <temperature time (ratio)>
40 ℃ 3min
70 ℃ (2 ℃ / min)
150 ℃ (5 ℃ / min)
300 ℃ (10 ℃ / min)
<MS>
Ionization method: EI (electron ionization) method Interface temperature: 300 ° C
Ion source temperature: 230 ° C
Quadrupole temperature: 150 ° C
Detection mode: Scan (range m / z = 40-460)
Initial Area Reject: 0
Initial Peak Width: 0.097
Shoulder Detection: off
Initial Threshold: 12.0
(3) Styrene determination 5 μL of the standard “heavy toluene / methanol solution (10 mg / L)” is injected into a tube containing Tenax TA. Next, 5 mg of the sample is weighed and added to the tube. Thereafter, the tube is set in a measuring device and measurement is performed. The quantification is carried out with one check amount, the peak area is measured for the peak of mass chromatogram of m / z = 98 for heavy toluene and m / z = 104 for styrene, and the styrene concentration is determined from the obtained peak area ratio.
〔カリウムの含有量〕
カリウムの含有量は、ICP発光分析を用いて測定する。
[Potassium content]
The potassium content is measured using ICP emission spectrometry.
＜ICP発光分析条件＞
試料0.1gをケルダールフラスコに採取し、硫酸−硝酸−過酸化水素による湿式分解を行い、分解液をメスフラスコに移して50mLとする。この分解液について、硫酸を基準にした検量線を用いて、原子吸光装置でカリウムを定量する。
<ICP emission analysis conditions>
A 0.1 g sample is collected in a Kjeldahl flask, wet-decomposed with sulfuric acid-nitric acid-hydrogen peroxide, and the decomposition solution is transferred to a volumetric flask to make 50 mL. About this decomposition solution, potassium is quantified with an atomic absorption device using a calibration curve based on sulfuric acid.
樹脂製造例１
表１に示す無水トリメリット酸以外のポリエステル単量体の原料モノマー及びエステル化触媒としてオクチル酸スズ40gを、窒素導入管、脱水管、攪拌器及び熱電対を装備した10リットル容の四つ口フラスコに入れ、230℃でテレフタル酸の粒が確認できなくなるまで縮重合反応させた。さらに、8kPaで1時間反応させ、表１に示すパラフィンワックス「HNP-9」(日本精鑞社製)を添加し、160℃に冷却後、表１に示すビニル系樹脂単量体の原料モノマー及び重合開始剤の混合物を滴下ロートにより1時間かけて滴下した。滴下後、160℃に保持したまま、1時間付加重合反応を熟成させた後、210℃に昇温し、8kPaで1時間保持して、ビニル系樹脂単量体の重合度の調整をおこなった。その後、表１に示す無水トリメリット酸を加えて、架橋反応を所定の軟化点に達するまで行い樹脂Ａを得た。なお、樹脂Ａにおける、ポリエステル単量体とビニル系樹脂単量体の重量比(ポリエステル単量体／ビニル系樹脂単量体の重量比)は79/18である。
Resin production example 1
The raw material monomer of polyester monomers other than trimellitic anhydride shown in Table 1 and 40 g of tin octylate as an esterification catalyst, 4 liters of 10 liters equipped with nitrogen introduction tube, dehydration tube, stirrer and thermocouple The flask was placed in a flask and subjected to a condensation polymerization reaction at 230 ° C. until no terephthalic acid particles could be confirmed. Further, the reaction is carried out at 8 kPa for 1 hour, paraffin wax “HNP-9” (manufactured by Nippon Seiki Co., Ltd.) shown in Table 1 is added, and after cooling to 160 ° C., the raw material monomer of the vinyl resin monomer shown in Table 1 And the mixture of the polymerization initiator was dripped over 1 hour with the dropping funnel. After dropping, after aging the addition polymerization reaction for 1 hour while maintaining at 160 ° C, the temperature was raised to 210 ° C and maintained at 8 kPa for 1 hour to adjust the polymerization degree of the vinyl resin monomer. . Thereafter, trimellitic anhydride shown in Table 1 was added, and a crosslinking reaction was performed until a predetermined softening point was reached to obtain a resin A. In the resin A, the weight ratio of polyester monomer to vinyl resin monomer (weight ratio of polyester monomer / vinyl resin monomer) is 79/18.
樹脂製造例２
表１に示す無水トリメリット酸以外のポリエステル単量体の原料モノマー及びエステル化触媒としてオクチル酸スズ40gを、窒素導入管、脱水管、攪拌器及び熱電対を装備した10リットル容の四つ口フラスコに入れ、230℃でテレフタル酸の粒が確認できなくなるまで縮重合反応させた。さらに、8kPaで1時間反応させ、表１に示すパラフィンワックス「HNP-9」(日本精鑞社製)を添加し、160℃に冷却後、表１に示すビニル系樹脂単量体の原料モノマー及び重合開始剤の混合物を滴下ロートにより1時間かけて滴下した。滴下後、160℃に保持したまま、1時間付加重合反応を熟成させた後、210℃に昇温し、8kPaで0.5時間保持した。次いで、210℃で40kPaにおいて攪拌しながら、2時間かけて140℃の蒸気を、500g (付加重合系樹脂単量体の総量100重量部に対して、28.1重量部)／時間の速度で樹脂中に添加した。その後、表１に示す無水トリメリット酸を加えて、架橋反応を所定の軟化点に達するまで行い樹脂Ｂを得た。なお、樹脂Ｂにおける、ポリエステル単量体とビニル系樹脂単量体の重量比(ポリエステル単量体／ビニル系樹脂単量体の重量比)は79/18である。
Resin production example 2
The raw material monomer of polyester monomers other than trimellitic anhydride shown in Table 1 and 40 g of tin octylate as an esterification catalyst, 4 liters of 10 liters equipped with nitrogen introduction tube, dehydration tube, stirrer and thermocouple The flask was placed in a flask and subjected to a condensation polymerization reaction at 230 ° C. until no terephthalic acid particles could be confirmed. Further, the reaction is carried out at 8 kPa for 1 hour, paraffin wax “HNP-9” (manufactured by Nippon Seiki Co., Ltd.) shown in Table 1 is added, and after cooling to 160 ° C., the raw material monomer of the vinyl resin monomer shown in Table 1 And the mixture of the polymerization initiator was dripped over 1 hour with the dropping funnel. After the dropwise addition, the addition polymerization reaction was aged for 1 hour while maintaining the temperature at 160 ° C, and then the temperature was raised to 210 ° C and maintained at 8 kPa for 0.5 hours. Next, while stirring at 210 ° C. and 40 kPa, steam at 140 ° C. over 2 hours was added to the resin at a rate of 500 g (28.1 parts by weight with respect to 100 parts by weight of the total amount of addition polymerization resin monomer) / hour. Added to. Thereafter, trimellitic anhydride shown in Table 1 was added, and a crosslinking reaction was carried out until a predetermined softening point was reached to obtain a resin B. In the resin B, the weight ratio of polyester monomer to vinyl resin monomer (weight ratio of polyester monomer / vinyl resin monomer) is 79/18.
樹脂製造例３
表１に示すフマル酸及び無水トリメリット酸以外の原料モノマー及びエステル化触媒としてオクチル酸スズ40gを、窒素導入管、脱水管、攪拌器及び熱電対を装備した10リットル容の四つ口フラスコに入れ、230℃でテレフタル酸の粒が確認できなくなるまで縮重合反応させた。さらに、8kPaで1時間反応させ、表１に示すパラフィンワックス「HNP-9」(日本精鑞社製)を添加し、160℃に冷却後、表１に示すビニル系樹脂単量体の原料モノマー及び重合開始剤の混合物を滴下ロートにより1時間かけて滴下した。滴下後、160℃に保持したまま、1時間付加重合反応を熟成させた後、210℃に昇温し、8kPaで0.5時間保持した。その後、180℃に冷却し、表１に示すフマル酸と重合禁止剤としてハイドロキノン5gを加えて、10℃／時間で昇温しながら210℃まで反応させた。更に表１に示す無水トリメリット酸を加えて、架橋反応を所定の軟化点に達するまで行い樹脂Ｃを得た。なお、樹脂Ｃにおける、ポリエステル単量体とビニル系樹脂単量体の重量比(ポリエステル単量体／ビニル系樹脂単量体の重量比)は78/18である。
Resin production example 3
Raw material monomers other than fumaric acid and trimellitic anhydride shown in Table 1 and 40 g of tin octylate as an esterification catalyst were placed in a 10-liter four-necked flask equipped with a nitrogen inlet tube, a dehydrating tube, a stirrer and a thermocouple. The mixture was subjected to a condensation polymerization reaction at 230 ° C. until no terephthalic acid particles could be confirmed. Further, the reaction is carried out at 8 kPa for 1 hour, paraffin wax “HNP-9” (manufactured by Nippon Seiki Co., Ltd.) shown in Table 1 is added, and after cooling to 160 ° C., the raw material monomer of the vinyl resin monomer shown in Table 1 And the mixture of the polymerization initiator was dripped over 1 hour with the dropping funnel. After the dropwise addition, the addition polymerization reaction was aged for 1 hour while maintaining the temperature at 160 ° C, and then the temperature was raised to 210 ° C and maintained at 8 kPa for 0.5 hours. Thereafter, the mixture was cooled to 180 ° C., fumaric acid shown in Table 1 and 5 g of hydroquinone as a polymerization inhibitor were added, and the mixture was allowed to react at 210 ° C. while raising the temperature at 10 ° C./hour. Further, trimellitic anhydride shown in Table 1 was added, and a crosslinking reaction was carried out until a predetermined softening point was reached to obtain a resin C. In the resin C, the weight ratio of polyester monomer to vinyl resin monomer (weight ratio of polyester monomer / vinyl resin monomer) is 78/18.
樹脂製造例４
表１に示す無水トリメリット酸以外の原料モノマー及びエステル化触媒としてオクチル酸スズ40gを、窒素導入管、脱水管、攪拌器及び熱電対を装備した10リットル容の四つ口フラスコに入れ、220℃で8時間縮重合反応させた。さらに、8.3kPaで1時間反応させた後、210℃に冷却し、表１に示す無水トリメリット酸を添加し、所望の軟化点に達するまで反応を行い、樹脂Ｄを得た。
Resin production example 4
Raw material monomers other than trimellitic anhydride shown in Table 1 and 40 g of tin octylate as an esterification catalyst were placed in a 10-liter four-necked flask equipped with a nitrogen introduction tube, a dehydration tube, a stirrer, and a thermocouple. The polycondensation reaction was carried out at 8 ° C for 8 hours. Furthermore, after reacting at 8.3 kPa for 1 hour, the mixture was cooled to 210 ° C., trimellitic anhydride shown in Table 1 was added, and the reaction was performed until the desired softening point was reached, whereby Resin D was obtained.
樹脂製造例５
表１に示す無水トリメリット酸以外のポリエステルの原料モノマー、スチレン及びエステル化触媒としてオクチル酸スズ40gを、窒素導入管、脱水管、攪拌器及び熱電対を装備した10リットル容の四つ口フラスコに入れ、220℃で8時間縮重合反応させた。さらに、8.3kPaで1時間反応させた後、210℃に冷却し、表１に示す無水トリメリット酸を添加し、所望の軟化点に達するまで反応を行い、樹脂Ｅを得た。
Resin production example 5
A 10-liter four-necked flask equipped with a raw material monomer for polyester other than trimellitic anhydride shown in Table 1, styrene and 40 g of tin octylate as an esterification catalyst, equipped with a nitrogen inlet tube, a dehydrating tube, a stirrer and a thermocouple And subjected to a condensation polymerization reaction at 220 ° C. for 8 hours. Furthermore, after reacting at 8.3 kPa for 1 hour, the mixture was cooled to 210 ° C., trimellitic anhydride shown in Table 1 was added, and the reaction was performed until the desired softening point was reached.
実施例１-１〜５-１及び比較例１-１〜２-１
表２に示すトナー原料をヘンシェルミキサーにて攪拌混合後、混練部分の全長1560mm、スクリュー径42mm、バレル内径43mmの同方向回転二軸押出機を用いて溶融混練した。ロールの回転速度は200r／min、ロール内の加熱温度は120℃であり、混合物の供給速度は10kg／時間、平均滞留時間は約18秒であった。得られた混練物を冷却ローラーで圧延冷却した後、ジェットミルで粉砕し、分級して、体積中位粒径(D50)4.5μmのトナーを得た。
Examples 1-1 to 5-1 and Comparative Examples 1-1 to 2-1
The toner materials shown in Table 2 were stirred and mixed with a Henschel mixer, and then melt-kneaded using a co-rotating twin screw extruder having a total kneading part length of 1560 mm, a screw diameter of 42 mm, and a barrel inner diameter of 43 mm. The rotation speed of the roll was 200 r / min, the heating temperature in the roll was 120 ° C., the feed rate of the mixture was 10 kg / hour, and the average residence time was about 18 seconds. The obtained kneaded product was rolled and cooled with a cooling roller, then pulverized with a jet mill and classified to obtain a toner having a volume-median particle size (D 50 ) of 4.5 μm.
試験例１〔カリウム含有率〕
表２のトナーについて、冷却ローラーで圧延冷却した混練物と粉砕分級後の分級品について、ICP発光分析によりカリウムを定量し、混練物と分級品のカリウム含有量の比(混練物／分級品)を算出し、以下の評価基準に従ってカリウム含有率を評価した。なお、カリウム含有率が高いほど、微粉側へのカリウムの移行程度が低いことを示す。結果を表２に示す。
Test Example 1 [Potassium content]
For the toner of Table 2, potassium was quantified by ICP emission analysis for the kneaded product rolled and cooled with a cooling roller and the classified product after pulverization classification, and the ratio of potassium content between the kneaded product and the classified product (kneaded product / classified product). And the potassium content was evaluated according to the following evaluation criteria. In addition, it shows that the transfer grade of potassium to the fine powder side is so low that potassium content rate is high. The results are shown in Table 2.
〔カリウム含有率の評価基準〕
◎：混練物／分級品が0.9以上
○：混練物／分級品が0.8以上、0.9未満
△：混練物／分級品が0.7以上、0.8未満
×：混練物／分級品が0.7未満
[Evaluation criteria for potassium content]
◎: Kneaded product / classified product is 0.9 or more ○: Kneaded product / classified product is 0.8 or more and less than 0.9 Δ: Kneaded product / classified product is 0.7 or more and less than 0.8 ×: Kneaded product / classified product is less than 0.7
実施例１-２〜５-２及び比較例１-２〜２-２
表３に示すトナー原料を用い、実施例１-１〜５-１及び比較例１-１〜２-１において下限分級で得られた回収微粉を、回収微粉を添加する前のトナー原料組成物100重量部に対して20重量部トナー原料として用いた以外は実施例１-１〜５-１及び比較例１-１〜２-１と同様にして、体積中位粒径(D50)4.5μmの粉体を得た。
Examples 1-2 to 5-2 and Comparative Examples 1-2 to 2-2
The toner raw material composition before adding the recovered fine powder to the recovered fine powder obtained in the lower limit classification in Examples 1-1 to 5-1 and Comparative Examples 1-1 to 2-1 using the toner raw materials shown in Table 3 The volume-median particle size (D 50 ) is 4.5 in the same manner as in Examples 1-1 to 5-1 and Comparative Examples 1-1 to 2-1, except that 20 parts by weight of toner is used with respect to 100 parts by weight. A μm powder was obtained.
得られた粉体100重量部に、外添剤として「アエロジル R-972」(日本アエロジル社製)2.0重量部を添加し、ヘンシェルミキサーで混合して、トナーを得た。 To 100 parts by weight of the obtained powder, 2.0 parts by weight of “Aerosil R-972” (manufactured by Nippon Aerosil Co., Ltd.) as an external additive was added and mixed with a Henschel mixer to obtain a toner.
試験例２〔臭気〕
得られたトナー3gを密閉系で180℃3分間過熱した後、臭いをかぎ、以下の評価基準に従って臭気を評価した。結果を表３に示す。
Test Example 2 [Odor]
3 g of the toner thus obtained was heated in a closed system at 180 ° C. for 3 minutes, then the odor was removed, and the odor was evaluated according to the following evaluation criteria. The results are shown in Table 3.
〔臭気の評価基準〕
○：ほとんど臭いがしなかった
△：スチレン由来の弱い臭いがした
×：スチレン由来のかなり強い臭いがした
[Odor evaluation criteria]
○: Almost no odor △: Slightly odor derived from styrene ×: Slightly strong odor derived from styrene
試験例３〔カブリ〕
非磁性一成分現像方式のMICROLINE 703N3(沖データ社製)にトナーを実装し、印字率5％のチャートを2000枚印字した。印字後、紙面中央部に幅5cm長さ10cmのベタ画像のある画像を印字、ベタ画像から1cmのところのカブリを測定した。ミノルタ社製色彩色差計「CR-300」のL*a*b*モードで測定し、ΔEを求め、以下の評価基準に従ってカブリを評価した。結果を表３に示す。
Test Example 3 [Fog]
Toner was mounted on MICROLINE 703N3 (Oki Data Co., Ltd.), a non-magnetic one-component development system, and 2000 charts with a printing rate of 5% were printed. After printing, an image with a solid image having a width of 5 cm and a length of 10 cm was printed at the center of the paper, and fogging at a location 1 cm from the solid image was measured. Measurement was performed in the L * a * b * mode of a color difference meter “CR-300” manufactured by Minolta, ΔE was obtained, and fog was evaluated according to the following evaluation criteria. The results are shown in Table 3.
〔カブリの評価基準〕
◎：ΔEが1.0未満
○：ΔEが1.0以上、2.0未満
△：ΔEが2.0以上、3.0未満
×：ΔEが3.0以上
[Evaluation criteria for fogging]
◎: ΔE is less than 1.0 ○: ΔE is 1.0 or more, less than 2.0 △: ΔE is 2.0 or more, less than 3.0 ×: ΔE is 3.0 or more
以上の結果より、実施例のトナーは、比較例と対比して、臭気が少なく、トナーに耐久性が要求される一成分現像方式においても、かぶりの少ない高画質を実現できていることが分かる。 From the above results, it can be seen that the toners of the examples have less odor and can achieve high image quality with less fog even in the one-component development system that requires durability of the toner, as compared with the comparative example. .
本発明の電子写真用トナーは、電子写真法、静電記録法、静電印刷法等において形成される潜像の現像等に用いられる。 The electrophotographic toner of the present invention is used for developing a latent image formed in an electrophotographic method, an electrostatic recording method, an electrostatic printing method or the like.
Claims (8)
(2) スチレンを含む付加重合系樹脂の原料モノマーを付加重合反応させる工程(Ａ)、(Ａ)の途中及び／又は終了後に、工程(Ａ)で生じる反応混合物と水とを混合する工程(Ｂ)、並びに工程(Ａ)及び工程(Ｂ)の前、中及び後の少なくともいずれかの時点で、さらにアルコール成分とカルボン酸成分とを含むポリエステルの原料モノマーを前記の反応系に存在させて縮重合反応させる工程(Ｃ)を有する方法により得られる、
アルコール成分とカルボン酸成分とを含むポリエステルの原料モノマー及びスチレンを含む付加重合系樹脂の原料モノマーを用いて得られる複合樹脂
からなる結着樹脂、着色剤、及び式(III)：
で表されるベンジル酸誘導体の金属化合物を含有してなるトナー原料組成物を溶融混練する工程、得られた溶融混練物を粉砕・分級する工程を含む、前記結着樹脂、前記着色剤、及び前記ベンジル誘導体の金属化合物を含有し、トナー中のスチレン含有量が3〜52ppmである電子写真用トナーの製造方法。 (1) Polyester obtained by condensation polymerization of an alcohol component and a carboxylic acid component in the presence of styrene, or
(2) A step of mixing the reaction mixture produced in step (A) with water during and / or after steps (A) and (A) of subjecting addition monomer of addition polymerization resin containing styrene to an addition polymerization reaction ( B), and at least at any point before, during and after step (A) and step (B), a polyester raw material monomer further containing an alcohol component and a carboxylic acid component is present in the reaction system. Obtained by a method having a step (C) of condensation polymerization reaction,
A binder resin, a colorant, and a formula (III) comprising a composite resin obtained by using a raw material monomer for a polyester containing an alcohol component and a carboxylic acid component and a raw material monomer for an addition polymerization resin containing styrene:
The binder resin, the colorant, and the step of melt-kneading a toner raw material composition containing a metal compound of a benzylic acid derivative represented by the following: pulverizing and classifying the obtained melt-kneaded product A method for producing an electrophotographic toner comprising the metal compound of the benzyl derivative, wherein the styrene content in the toner is 3 to 52 ppm.
で表されるベンジル酸誘導体の金属化合物及びスチレンを含有し、トナー中のスチレン含有量が3〜100ppmである電子写真用トナーの製造方法であって、前記結着樹脂、前記着色剤、前記ベンジル酸誘導体の金属化合物及びスチレンを含有してなるトナー原料組成物を溶融混練する工程、得られた溶融混練物を粉砕・分級する工程を含む、電子写真用トナーの製造方法。 Binder resin made of polyester, colorant, formula (III):
A method for producing a toner for electrophotography comprising a metal compound of a benzylic acid derivative represented by formula (I) and styrene, wherein the styrene content in the toner is 3 to 100 ppm, the binder resin, the colorant, and the benzyl A method for producing an electrophotographic toner, comprising: a step of melt kneading a toner raw material composition containing a metal compound of an acid derivative and styrene; and a step of pulverizing and classifying the obtained melt kneaded product .
で表されるビスフェノールAのアルキレンオキサイド付加物を40モル％以上含むアルコール成分を用いて得られる、請求項１〜７いずれか記載の電子写真用トナーの製造方法。 The polyester has the formula (I):
In the resulting alkylene oxide adduct of bisphenol A represented by using an alcohol component containing 40 mol% or more, according to claim 1-7 method of manufacturing toner for electrophotography according to any one.
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