JP2011085935A - 硬化性トナー組成物およびプロセス - Google Patents
硬化性トナー組成物およびプロセス Download PDFInfo
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- JP2011085935A JP2011085935A JP2010231269A JP2010231269A JP2011085935A JP 2011085935 A JP2011085935 A JP 2011085935A JP 2010231269 A JP2010231269 A JP 2010231269A JP 2010231269 A JP2010231269 A JP 2010231269A JP 2011085935 A JP2011085935 A JP 2011085935A
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- toner
- resin
- copoly
- polyester resin
- photoinitiator
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Classifications
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- G—PHYSICS
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- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2007—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using radiant heat, e.g. infrared lamps, microwave heaters
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2098—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using light, e.g. UV photohardening
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G9/00—Developers
- G03G9/08—Developers with toner particles
- G03G9/0802—Preparation methods
- G03G9/0804—Preparation methods whereby the components are brought together in a liquid dispersing medium
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- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G9/00—Developers
- G03G9/08—Developers with toner particles
- G03G9/087—Binders for toner particles
- G03G9/08742—Binders for toner particles comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- G03G9/08755—Polyesters
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- G—PHYSICS
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Abstract
【解決手段】トナー粒子を含むエマルション凝集トナー組成物であって、該トナー粒子が、非晶質ポリエステル樹脂と、自由選択の結晶性樹脂と、自由選択の着色剤と、自由選択のワックスと、自由選択の凝集剤と、前記ポリエステル樹脂の架橋を開始し得るポリマー状またはオリゴマー状のヒドロキシケトン光開始剤と、を含む。該非晶質ポリエステル樹脂および存在する場合には該結晶性樹脂のうち、少なくとも1つが不飽和である。
【選択図】なし
Description
(式中、RはH、CH3またはCnH2n+1により表されるアルキル基であり、nは2から約1000の正の整数である。)そのようなポリマー状またはオリゴマー状のヒドロキシケトン光開始剤の市販されている例には、ESACURE(登録商標)Oneシリーズ(Esacure One 75、Esacure one 65)およびESACURE(登録商標)KIPシリーズ(KIP 150、KIP 75LT、KIP IT、KIP 100F)などLamberti(Sartomer)Company、Inc.から入手できるESACURE(登録商標)光開始剤が挙げられる。2種以上のそのようなポリマー状またはオリゴマー状のヒドロキシケトン光開始剤の混合物、または1種以上のポリマー状またはオリゴマー状のヒドロキシケトン光開始剤および1種以上の従来の光開始剤も使用することができる。
オーバーヘッド攪拌機(overhead stirrer)および加熱マントルを備えた2リットルのガラス反応器中に、183.25グラムの非晶質樹脂エマルション(XP777、プロポキシル化ビスフェノールAフマレート樹脂、ReicholdからのResapol)(45.84重量パーセント)および104.03グラムの不飽和CPE樹脂エマルション(UCPE、16.15重量パーセント)を加えた。41.82グラムのAl2(SO4)3溶液(1重量パーセント)を均質化しながら綿毛状で(as flocculent)加えた。続いて混合物を、凝集させるために300rpmで46.2℃に加熱した。粒径を、コールターカウンターで、コア粒子が1.25のGSDで体積平均粒径4.59ミクロンに達するまでモニターし、次いで85.52グラムの上記XP777樹脂エマルションをシェルとして添加した結果、GSD1.23で6.48ミクロンの平均粒径を有するコアシェル構造の粒子が生成した。その後、反応スラリーのpHを、1.615グラムのEDTA(39重量パーセント)およびNaOH(4重量パーセント)を使用して7.2に上げ、トナーの成長を停止させた。成長停止後、反応混合物を69.9℃に加熱し、合一のためにpHを5.97に下げた。合一後トナーを急冷した。トナーの最終粒径は5.90ミクロン、GSDは1.25、および真球度は0.960である。次に、トナーのスラリーを室温に冷却し、篩って分離し(25ミクロン)、濾過した後、洗浄して凍結乾燥した。
220グラムのXP777樹脂および9.167グラムの光開始剤Irgacure 819を秤量して約2000グラムの酢酸エチルを入れた2リットルのビーカー中に加えた。混合物を室温で毎分約300回転させて攪拌し、樹脂およびIR吸収体を酢酸エチル中に溶解させた。4.69グラムの重炭酸ナトリウムを秤量して約1700グラムの脱イオン水を入れた4リットルのパイレックス(登録商標)ガラスのフラスコ反応器中に加えた。4リットルのガラスフラスコ反応器中の水溶液の均質化を、IKA Ultra Turrax T50ホモジナイザーを使用して毎分4,000回転で開始した。次いで、樹脂溶液を水溶液中にゆっくり注ぎ、混合物が継続して均質化されるように、ホモジナイザー速度を毎分8,000回転に上げて、これらの条件で均質化を約30分間実施した。均質化が完了したら、内容物の入ったガラスフラスコ反応器を加熱マントル中に置いて蒸留装置に接続した。混合物を毎分約200回転で攪拌し、前記混合物の温度を毎分約1℃で80℃まで上昇させ、混合物から酢酸エチルを留去した。前記混合物の攪拌を、80℃で約180分間継続した後、毎分約2℃で室温に冷却した。生成物を25ミクロンの篩いを通して篩い分けた。生成した樹脂エマルションは水中に約30.00重量パーセントの固体を含んだ。
このエマルションは、4wt%の光開始剤ESACURE(登録商標)ONEを使用したことを除き、上記比較例2と同じ手順に従って調製した。
Claims (2)
- トナー粒子を含むエマルション凝集トナー組成物であって、前記トナー粒子が、
非晶質ポリエステル樹脂と、
自由選択の結晶性樹脂と、
自由選択の着色剤と、
自由選択のワックスと、
自由選択の凝集剤と、
前記ポリエステル樹脂の架橋を開始し得るポリマー状またはオリゴマー状のヒドロキシケトン光開始剤と、
を含み、
前記非晶質ポリエステル樹脂および存在する場合には前記結晶性樹脂のうち、少なくとも1つが不飽和である、エマルション凝集トナー組成物。 - トナーを調製するためのエマルション凝集プロセスであって、
(i)ポリエステル樹脂および光開始剤を乳化するステップであって、前記ポリエステル樹脂は非晶質樹脂と、場合により、結晶性樹脂と、を含み、該非晶質ポリエステル樹脂および存在する場合には前記結晶性樹脂のうち、少なくとも1つが不飽和であり、前記光開始剤はポリマー状またはオリゴマー状のヒドロキシケトン光開始剤である、ステップと、
(ii)それらに、着色剤分散液と、場合により、ワックス分散液と、界面活性剤と、を添加するステップと、
(iii)それらに、約2,000から約10,000rpmで均質化しながら凝集剤を添加して混合物を形成させ、場合により、混合物のpHを約7から約2.5に調節し、それにより直径約1から約4μmの凝集した複合体を含む凝集体混合物を生成させるステップと、
(iv)前記凝集体混合物を約30から約50℃の温度に加熱し、粒径が直径約3から約11μmの凝集体複合体を生成させるステップと、
(v)pHを約6から約9に調節してトナー複合体粒径の成長を停止し、場合により、金属封鎖剤を添加するステップと、
(vi)前記凝集体複合体を約63から約90℃の温度に加熱し、場合により、pHを約8から約5.5に調節し、合一したトナー粒子を生成させるステップと、
(vii)場合により、前記トナー粒子を洗浄して乾燥するステップと、
を含む、エマルション凝集プロセス。
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