EP0220319A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Toner for electrostatic image developement and process for forming an image by using it
Assignee: Konica Minolta Inc
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Filing: 1986-03-15
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Granted: —
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Expires: 2006-03-15
Abstract
Abstract Toner for use in developing an electrostatic image in electrophotography, electrostatic printing, electrostatic recording, etc. and a process for forming an image by using it. The toner comprises a resin mainly comprising a copolymer wherein a crystalline polymer block having a specified point is chemically bound to an amorphous polymer block having a specified glass transition point and possesses a modulus of elasticity within a specified range. The toner can be sufficiently fixed at low temperatures, shows good offset resistance, and has excellent blocking resistance, flowability, charging properties, filming resistance, and cleanability. The toner can consistently form a good visible image.
Inventors
- 👤 A. Konishiroku Photo Industry Co. Ltd. Matsubara
- 👤 S. Konishiroku Photo Industry Co. Ltd. Ikeuchi
- 👤 K. Konishiroku Photo Industry Co. Ltd. Akimoto
- 👤 Y. Konishiroku Photo Industry Co. Ltd. Takizawa
- 👤 T. Konishiroku Photo Industry Co. Ltd. Hiroyuki
- 👤 N. Konishiroku Photo Industry Co. Ltd. Hiroyuki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 16:17
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08784; G03G9/08788; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105; Y10S525/00; Y10S525/934
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
114 words
(1) A toner for development of electrostatic images constituted of at least a resin and a colorant, characterized in that said resin is mainly constituted of a copolymer comprising a crystalline polymer block and an amorphous polymer block chemically bound to each other, said crystalline polymer block has a melting point of 50 to 120 ° C , said amorphous polymer block has a glass transition point of 50 to 100 °C, and at least one point of the dynamic moduli at 70 to 140 °C of said toner has a value not smaller than 2 x 10 3 dyn/cm 2 and not greater than 1 x 10 5 d y n/cm 2 .
Claim 2
Dependent Claim
38 words
(2) A toner for development of electrostatic images according to claim (1), wherein 1 to 60 parts by weight of said crystalline polymer block is contained in said copolymer based on 100 parts by weight of said copolymer.
Claim 3
Dependent Claim
27 words
(3) A toner for development of electrostatic images according to claim (1), wherein said amorphous polymer block has a glass transition point of 50 to 85 °C.
Claim 4
Dependent Claim
23 words
(4) A toner for development of electrostatic images according to claim (1), wherein said crystalline polymer block is constituted of a polyester polymer.
Claim 5
Dependent Claim
143 words
(5) An image forming method, which comprises developing with a toner for development of electrostatic images on a photosensitive member constituted of at least of a resin and a colorant, wherein said resin is mainly constituted of a copolymer comprising a crystalline polymer block and an amorphous polymer block chemically bound to each other, said crystalline polymer block has a melting point of 50 to 120 °C, said amorphous polymer block has a glass transition point of 50 to 100 °C, and at least one point of the dynamic moduli at 70 to 140 °C of said toner has a value not smaller than 2 x 10 3 dyn/cm 2 and not greater than 1 x 10 5 dyn/cm 2 , effecting electrostatic transfer onto a transfer material such as paper, etc., and carrying out hot roller fixing to obtain a fixed image.
Claim 6
Dependent Claim
35 words
(6) An image forming method according to claim (5), wherein 1 to 60 parts by weight of said crystalline polymer block is contained in said copolymer based on 100 parts by weight of said copolymer.
Claim 7
Dependent Claim
24 words
(7) An image forming method according to claim (5), wherein said amorphous polymer block has a glass transition point of 50 to 85 °C.
Claim 8
Dependent Claim
20 words
(8) An image forming method according to claim (5), wherein said crystalline polymer block is constituted of a polyester polymer.
References Cited (Backward Citations)
No citation records indexed.
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