Patent US4980258A successfully refreshed from Google Patents.
US4980258A
Expired / Lapsed
US
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Dry type developer for electrophotography
Assignee: Ricoh Co Ltd
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Filing: 1989-11-14
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Granted: 1990-12-25
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Expires: 2009-11-14
Abstract
Abstract The present invention relates to the positively chargeable black toner particles which comprise binder resins, carbonblack as a main colorant, quaternary anmonium salt of the following formula (I) as a charge control agent and β-form Cu-phthalocyanine as a stabilizing agent for chargeability of toner particles without being affected by the change of environmental conditions. ##STR1## Wherein R 1 is C 1 -C 8 alkyl or benzyl, R 2 and R 3 are each C 1 -C 18 alkyl, R is C 1 -C 118 alkyl or benzyl, X is hydroxy or amino, and Y is hydoroxy or hydrogen; (c) β-form Cu-phthalocyanine; and (d) carbonblack. The present invention further relates to the two component dry-type developer composed by the improved above said positively chargeable toner particles and the carrier particles coated with silicone polylmers which have the strong durability without being changed to a supent carrier particles for a use of long time period.
Inventors
- 👤 Mitsuo Aoki
- 👤 Nobuhiro Nakayama
- 👤 Yasuo Asahina
- 👤 Hiroyuki Fushimi
- 👤 Kayo Makita
- 👤 Yasuaki Iwamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:54
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09733; G03G9/0975; G03G9/09; G03G9/0906; G03G9/0918; G03G9/09741
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
79 words
A toner particle of a two component dry-type developer capable of being charged positively comprises (a) a binder resin; (b) quaternary ammonium salt represented by the following formula (1) ##STR35## Wherein R 1 is C 1 -C 8 alkyl or benzyl, R 2 and R 3 are each C 1 -C 18 alkyl, R is C 1 -C 18 alkyl or benzyl, X is hydroxy or amino, and Y is hydoroxy or hydrogen; (c) β-form Cu-phthalocyanine; and (d) carbonblack.
Claim 2
Dependent Claim
79 words
A toner particle of a two component dry-type developer capable of being charged positively comprises (a) a binder resin; (b) quaternary ammonium salt represented by the following formula (1) ##STR35## Wherein R 1 is C 1 -C 8 alkyl or benzyl, R 2 and R 3 are each C 1 -C 18 alkyl, R is C 1 -C 18 alkyl or benzyl, X is hydroxy or amino, and Y is hydoroxy or hydrogen; (c) β-form Cu-phthalocyanine; and (d) carbonblack.
Claim 3
Dependent Claim
50 words
A toner particle as defined in claim 1 which comprises 0.05 to 10 parts by weight of quaternary ammonium salt repsented by the formula (I), 0.1 to 5 parts by weight of β-form Cu-phthalocyanine, 1 to 15 parts by weight of carbonblack and 100 parts by weight of binder resins.
Claim 4
Dependent Claim
18 words
A toner particle of claim 1 wherein said quaternary ammonium salt is represented by the following formula ##STR36##
Claim 5
Dependent Claim
18 words
A toner particle of claim 1 wherein said quaternary ammonium salt is represented by the following formula ##STR37##
Claim 6
Dependent Claim
18 words
A toner particle of claim 1 wherein said quaternary ammonium salt is represented by the following formula ##STR38##
Claim 7
Dependent Claim
18 words
A toner particle of claim 1 wherein said quaternary ammonium salt is represented by the following formula ##STR39##
Claim 8
Dependent Claim
18 words
A toner particle of claim 1 wherein said quaternary ammonium salt is represented by the following formula ##STR40##
Claim 9
Dependent Claim
18 words
A toner particle of claim 1 wherein said quaternary ammonium salt is represented by the following formula ##STR41##
Claim 10
Dependent Claim
21 words
A toner particle of claim 1 wherein said β-form Cu-phthalocyanine is the C.I. Pigment Blue 15:3 in the Colour Index Table.
Claim 11
Dependent Claim
20 words
Toner particles of claim 1 wherein said β-form Cu-phthalocyanine is the C.I. Pigment Blue 15:4 in the Colour Index Table.
Claim 12
Dependent Claim
21 words
A toner particle of claim 1 wherein an electrical resistiviy of said carbon black is 10 3 to 10 6 Ω-cm.
Claim 13
Dependent Claim
79 words
A developer composition composed by toner particles and carrier particles, said toner particles comprising (a) a binder resin; (b) a quaternary ammonium salt compound represented by the following formula (I) ##STR42## wherein R 1 is C 1 -C 8 alkyl or benzyl, R 2 and R 3 are each C 1 -C 18 alkyl, R is C 1 -C 18 alkyl or benzyl, X is hydroxy or amino, and Y is hydoroxy or hydro-gen; (c) β-form Cu-phthalocyanine; (d) carbonblack.
Claim 14
Dependent Claim
79 words
A developer composition composed by toner particles and carrier particles, said toner particles comprising (a) a binder resin; (b) a quaternary ammonium salt compound represented by the following formula (I) ##STR42## wherein R 1 is C 1 -C 8 alkyl or benzyl, R 2 and R 3 are each C 1 -C 18 alkyl, R is C 1 -C 18 alkyl or benzyl, X is hydroxy or amino, and Y is hydoroxy or hydro-gen; (c) β-form Cu-phthalocyanine; (d) carbonblack.
Claim 15
Dependent Claim
15 words
A developer composition of claim 12 wherein said carrier particles are overcoated with silicone resins.
References Cited (Backward Citations)
US4590141A
Cited
US4826749A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-12-24 | 1994-06-25 | 1994-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-24 | 1998-06-25 | 1998-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-24 | 2002-06-25 | 2002-12-25 | $7700.00 | Window Closed / Lapsed |