US4489150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic polyester toner blends
Assignee: Ricoh Co Ltd
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Filing: 1983-06-08
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Granted: 1984-12-18
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Expires: 2003-06-08
Abstract
Abstract A novel toner composition with improved thermal and rheological properties, improved surface energy, and better frangibility is provided. The toner comprises a thermoplastic polymeric blend and a coloring agent. The polymeric blend is comprised of propoxylated bisphenol-A fumarate and a polyester resin with a chemically bound halogen. A preferred polyester resin with a chemically bound halogen is tetrabromo-bisphenol fumarate polyester. An improved electrophotographic imaging process using the toner particles of the present invention is also provided.
Inventors
- 👤 Shaw-Ping Chang
- 👤 Paul Shieh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:03
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08742; G03G9/08755
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
29 words
A toner composition for electrophotographic developing, comprising a coloring agent and a thermoplastic polymeric blend comprising propoxylated bisphenol-A fumarate polyester and a polyester resin with a chemically bound halogen.
Claim 2
Dependent Claim
29 words
A toner composition for electrophotographic developing, comprising a coloring agent and a thermoplastic polymeric blend comprising propoxylated bisphenol-A fumarate polyester and a polyester resin with a chemically bound halogen.
Claim 3
Dependent Claim
20 words
A toner composition according to claim 1 wherein said polyester resin with a chemically bound halogen comprises tetrabromo-bisphenol fumarate polyester.
Claim 4
Dependent Claim
37 words
A toner composition according to claim 1 wherein said polymeric blend is comprised of from about 25:75 to about 75:25 by weight of said propoxylated bisphenol-A fumarate polyester and said polyester resin with a chemically bound halogen.
Claim 5
Dependent Claim
32 words
A toner composition according to claim 1 wherein said polymeric blend is comprised of about 50 percent by weight propoxylated bisphenol-A fumarate polyester and about 50 percent by weight tetrabromo-bisphenol fumarate polyester.
Claim 6
Dependent Claim
13 words
A toner according to claim 1 wherein said coloring agent is carbon black.
Claim 7
Dependent Claim
77 words
In an electrophotographic imaging process wherein a visible image is produced by contacting a latent electrostatic image with toner particles, and subsequently said visible image is fixed to a suitable receiving support by fusing said toner particles to said support, the improvement comprising the step of contacting said latent electrostatic image with toner particles comprising, a coloring agent and a thermoplastic polymeric blend comprising propoxylated bisphenol-A fumarate polyester and a polyester resin with a chemically bound halogen.
Claim 8
Dependent Claim
77 words
In an electrophotographic imaging process wherein a visible image is produced by contacting a latent electrostatic image with toner particles, and subsequently said visible image is fixed to a suitable receiving support by fusing said toner particles to said support, the improvement comprising the step of contacting said latent electrostatic image with toner particles comprising, a coloring agent and a thermoplastic polymeric blend comprising propoxylated bisphenol-A fumarate polyester and a polyester resin with a chemically bound halogen.
Claim 9
Dependent Claim
21 words
An electrophotographic imaging process according to claim 6 wherein said polyester resin with a chemically bound halogen comprises tetrabromo-bisphenol fumarate polyester.
References Cited (Backward Citations)
US4271249A
Cited
US4331755A
Cited
US4288516A
Cited
GB2082788A
Cited
GB2091897A
Cited
GB2100873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-18 | 1988-06-18 | 1988-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-18 | 1992-06-18 | 1992-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-18 | 1996-06-18 | 1996-12-18 | $7700.00 | Window Closed / Lapsed |