IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0459613
(2006-07-24)
|
등록번호 |
US-7611816
(2009-11-16)
|
우선권정보 |
JP-2005-220272(2005-07-29); JP-2005-220277(2005-07-29) |
발명자
/ 주소 |
- Tuji, Yoshinori
- Fumita, Hidekazu
- Omura, Minoru
|
출원인 / 주소 |
|
대리인 / 주소 |
Fitzpatrick, Cella, Harper & Scinto
|
인용정보 |
피인용 횟수 :
6 인용 특허 :
11 |
초록
▼
In a process for producing toner particles through granulation by a wet process, a process for producing toner particles is provided that enables reduction of water content in wet toner particle cakes obtained by separating toner particles from a toner particle dispersion in a good efficiency, follo
In a process for producing toner particles through granulation by a wet process, a process for producing toner particles is provided that enables reduction of water content in wet toner particle cakes obtained by separating toner particles from a toner particle dispersion in a good efficiency, followed by washing, and enables efficient wash-away of impurities remaining on the toner particle surfaces so as to promise superior image characteristics. The toner particles are produced through a filtering step in which a slurry which contains toner particles is subjected to solid-liquid separation by means of a belt filter having a pressing aeration means which carries out aeration with pressing, to form wet toner particle cakes.
대표청구항
▼
What is claimed is: 1. A process for producing toner particles in a liquid dispersion medium; the process being a toner particle production process comprising: (a) forming a slurry which contains toner particles; and (b) subjecting the slurry to a filtering step for solid-liquid separation by means
What is claimed is: 1. A process for producing toner particles in a liquid dispersion medium; the process being a toner particle production process comprising: (a) forming a slurry which contains toner particles; and (b) subjecting the slurry to a filtering step for solid-liquid separation by means of a belt filter having a pressing aeration means which carries out aeration with pressing, to form wet toner particle cakes, wherein said filtering step which forms the wet toner particle cakes comprises the steps, in sequence, of (i) dehydrating the slurry which contains toner particles, to obtain toner particle cakes; (ii) washing the resultant toner particle cakes to obtain wash-water-containing toner particle cakes; and (iii) subjecting the wash-water-containing toner particle cakes to aeration with pressure by said pressing aeration means to obtain said wet toner particle cakes. 2. The process for producing toner particles according to claim 1, which comprises a drying step for drying the wet toner particle cakes obtained through said filtering step. 3. The process for producing toner particles according to claim 2, wherein said drying step is the step of airborne drying in which said wet toner particle cakes are dispersed in hot-air streams and in the form of powder particles so as to be dried while being sent in flows parallel with the hot-air streams. 4. The process for producing toner particles according to claim 1, wherein said pressing aeration means has a perforated portion with holes through which at least aeration is performed, and has an elastic portion having elasticity, which surrounds the perforated portion and is so provided as to come into contact with a filter cloth of said belt filter at the time of aeration. 5. The process for producing toner particles according to claim 4, wherein a member constituting said elastic portion is formed of a soft rubber, and has rubber hardness F (degree) of: 10≦F≦40. 6. The process for producing toner particles according to claim 5, wherein said member constituting said elastic portion is formed of chloroprene rubber. 7. The process for producing toner particles according to claim 4, wherein compressed air is passed through said perforated portion. 8. The process for producing toner particles according to claim 7, wherein said compressed air has pressure P1 (kPa) of: 10≦P1≦900. 9. The process for producing toner particles according to claim 7, wherein said perforated portion affords aeration rate G per unit area and unit time (m3/m2·s) of: 0.01≦G≦0.50. 10. The process for producing toner particles according to claim 4, wherein, at the time of aeration, said elastic portion is kept in pressure contact with said filter cloth so that the air passed through said perforated portion does not leak from the pressing aeration part; the pressure contact being at pressure P2 (kPa) of: 20≦P2≦1,000. 11. The process for producing toner particles according to claim 1, wherein said liquid dispersion medium for dispersing the toner particles therein is an aqueous dispersion medium. 12. The process for producing toner particles according to claim 1, wherein said toner particles contained in said slurry are toner particles formed by polymerizing in an aqueous medium a polymerizable monomer composition containing at least a polymerizable monomer and a colorant. 13. The process for producing toner particles according to claim 12, wherein said colorant is constituted of a non-magnetic material. 14. The process for producing toner particles according to claim 12, wherein said colorant is a magnetic fine powder having been treated with a silane coupling agent. 15. The process for producing toner particles according to claim 1, wherein said belt filter is a vacuum belt filter in which, at the time of vacuum filtration, a filter cloth and a vacuum tray do not rub against each other in the state of being evacuated. 16. The process for producing toner particles according to claim 1, wherein said belt filter is a filter cloth intermittent movement type belt filter. 17. The process for producing toner particles according to claim 16, wherein said pressing aeration means is capable of coming into contact with and separating from the wet toner particle cakes, and said pressing aeration means interlocks with intermittent movement of the filter cloth of said filter cloth intermittent movement type belt filter. 18. The process for producing toner particles according to claim 4, wherein said elastic portion has width D (mm) around the perforated portion, of: 30≦D≦300. 19. The process for producing toner particles according to claim 1, wherein said wet toner particle cakes after the filtering step making use of said belt filter has a water content of 30% or less. 20. The process for producing toner particles according to claim 1, wherein the matter to be filtered that is to be fed to the filtering step is a slurry containing the toner particles having been subjected to defoaming treatment in a defoaming step. 21. The process for producing toner particles according to claim 20, wherein said defoaming treatment is the step of feeding to an evacuatable container the slurry containing the toner particles, to carry out vacuum treatment. 22. The process for producing toner particles according to claim 20, wherein said vacuum treatment is carried out under a reduced pressure of from 5 to 50 kPa. 23. The process for producing toner particles according to claim 20, wherein said defoaming treatment is the step of so treating the slurry as to satisfy the following relationship of: 1.05≦A/C≦3.00 where the bulk density of the toner-particle-containing slurry before defoaming treatment is represented by C (kg/l), and the bulk density of the toner-particle-containing slurry after defoaming treatment by A (kg/l).
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