US5124226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersion-polymerization process for producing a toner containing a pigment dispersed therein
Assignee: Nippon Paint Co Ltd
•
Filing: 1990-10-16
•
Granted: 1992-06-23
•
Expires: 2010-10-16
Abstract
Abstract The present invention provides a process for producing toner which has very narrow particle size distribution and contains a uniformity dispersed pigment therein. The process comprises dispersion-polymerizing (I) a pigment paste comprising (A) a pigment grinding agent having basic groups, acidic groups or the both, (B) a pigment and (C) vinyl monomers, (II) a polymerization initiator and (III) a dispersion polymerization stabilizer in a dispersion medium which dissolves said vinyl monomers (C) and dispersion polymerization stabilizer (III) and which does not dissolve polymerized resin particles.
Inventors
- 👤 Naoya Yabuuchi
- 👤 Masayuki Maruta
- 👤 Chikayuki Otsuka
- 👤 Akihiro Kanakura
- 👤 Akio Kashihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:21
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/0802; G03G9/0804; G03G9/0806
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
65 words
A process for producing toner, comprising dispersion-polymerizing (I) a pigment paste comprising (A) a pigment grinding agent having basic groups, acidic groups or both, (B) a pigment and (C) vinyl monomers, (II) a polymerization initiator and (III) a dispersion polymerization stabilizer in a dispersion medium which dissolves said vinyl monomers (C) and a dispersion polymerization stabilizer (III) and which does not dissolve polymerized resin particles.
Claim 2
Dependent Claim
65 words
A process for producing toner, comprising dispersion-polymerizing (I) a pigment paste comprising (A) a pigment grinding agent having basic groups, acidic groups or both, (B) a pigment and (C) vinyl monomers, (II) a polymerization initiator and (III) a dispersion polymerization stabilizer in a dispersion medium which dissolves said vinyl monomers (C) and a dispersion polymerization stabilizer (III) and which does not dissolve polymerized resin particles.
Claim 3
Dependent Claim
15 words
The process according to claim 1 wherein said pigment grinding agent has radically reactive groups.
Claim 4
Dependent Claim
18 words
The process according to claim 1 or claim 2 wherein said pigment paste further contains (D) a lubricant.
Claim 5
Dependent Claim
27 words
The process according to claim 3 wherein said lubricant (D) is selected from the group consisting of polyethylene wax, polypropylene wax, polydimethylsiloxane and a modified wax thereof.
Claim 6
Dependent Claim
37 words
The process according to anyone of claims 1 to wherein said pigment grinding agent (A) has a water tolerance of 5.0 or less and said dispersion polymerization stabilizer (III) has a water tolerance of 7.0 or more.
Claim 7
Dependent Claim
37 words
The process according to anyone of claims 1 to wherein said pigment grinding agent (A) has a hexane tolerance of 20 or less and said dispersion polymerization stabilizer (III) has a hexane tolerance of 30 or more.
References Cited (Backward Citations)
US3104068A
Cited
US4789617A
Cited
EP0246814A2
Cited
EP0297839A2
Cited
US4963455A
Cited
US4971882A
Cited
US5034297A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-23 | 1995-12-23 | 1996-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-23 | 1999-12-23 | 2000-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-23 | 2003-12-23 | 2004-06-23 | $7700.00 | Window Closed / Lapsed |