US4968576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resinous microparticles useful in powdery toner for electrophotography
Assignee: Nippon Paint Co Ltd
•
Filing: 1989-01-17
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Granted: 1990-11-06
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Expires: 2009-01-17
Abstract
Abstract Resinous microparticles useful in toner for electrophotography which are made of vinyl resin obtained by emulsion polymerization of at least one α,β-ethylenically unsaturated monomers in the presence of cationic surfactant having an onium salt structure and a polymerization initiator having an amidine or amidine salt structure and whose average particle diameter is in a range of from 0.01 to 1μ, and toner composition comprising toner particles and resinous microparticles as abovementioned are provided.
Inventors
- 👤 Masayuki Maruta
- 👤 Katsuaki Kida
- 👤 Eio Hisajima
- 👤 Akio Kashihara
- 👤 Naoya Yabuuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:36
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0819; C; C08; C08F; C08F2/00; C08F2/12; C08F2/16; C08F2/22; C08F2/24; C08F2/28; G03G9/087; G03G9/08702; G03G9/097; Y; Y10; Y10S; Y10S526/00; Y10S526/909
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
61 words
Resinous microparticles useful in toners for electrophotography which are made of vinyl resin obtained by emulsion polymerization of at least one α, β-ethylenically unsaturated monomers in the presence of cationic surfactant having an onium salt structure and a polymerization initiator having an amidine or amidine salt structure and whose average particle diameter is in a range of from 0.01 to 1μ.
Claim 2
Dependent Claim
61 words
Resinous microparticles useful in toners for electrophotography which are made of vinyl resin obtained by emulsion polymerization of at least one α, β-ethylenically unsaturated monomers in the presence of cationic surfactant having an onium salt structure and a polymerization initiator having an amidine or amidine salt structure and whose average particle diameter is in a range of from 0.01 to 1μ.
Claim 3
Dependent Claim
23 words
Resinous microparticles according to claim 1 wherein a carboxyl group bearing monomer is used as a part of said α, β-ethylenically unsaturated monomers.
Claim 4
Dependent Claim
23 words
Resinous microparticles according to claim 1 wherein an amphoionic group bearing monomer is used as a part of said α, β-ethylenically unsaturated monomers.
Claim 5
Dependent Claim
34 words
A toner composition for electrophotographic use which contains a toner and is characterized by containing 0.01 to 5% the resinous microparticles of claim 1, 2 or 3, by weight of the total toner weight.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-05 | 1994-05-07 | 1994-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-05 | 1998-05-07 | 1998-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-05 | 2002-05-07 | 2002-11-06 | $7700.00 | Window Closed / Lapsed |