US4978596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic toner comprising lactone-modified epoxy resin
Assignee: Hitachi Ltd
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Filing: 1986-03-17
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Granted: 1990-12-18
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Expires: 2006-03-17
Abstract
Abstract The present invention provides an electrophotographic toner, particularly with a good transferability and a good flowability, which comprises a binder resin and a coloring agent, the binder resin containing a lactone-modified epoxy resin, obtained by subjecting all or a portion of secondary hydroxyl groups of epoxy compounds having hydroxyl groups in the molecules to ring opening polymerization of lactone. The present invention further provides an electrophotographic toner with a good transferability, a good flowability and a good offset resistance and also with a fixability of transferred images, which comprises a binder resin and a coloring aent, the binder resin containing: (1) a lactone-modified epoxy resin, obtained by subjecting all or a portion of secondary hydroxyl groups of epoxy compounds having hydroxy groups in the molecules to ring opening polymerization of lactone, (2) styrene-butadiene rubber, and (3) polyester resin.
Inventors
- 👤 Ryuichi Shimizu
- 👤 Tsuneaki Kawanishi
- 👤 Shigeo Suzuki
- 👤 Shigeo Hosaka
- 👤 Yasuki Mori
- 👤 Toshikazu Narahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:14
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08742; G03G9/08753; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
58 words
A non-magnetic electrophotographic toner which comprises a binder resin, and a coloring agent, the binder resin containing a thermoplastic lactone-modified epoxy resin having a lactone content of 3 to 90% by weight, obtained by subjecting all or a portion of secondary hydroxyl groups of epoxy compounds having hydroxyl groups in the molecules to ring opening polymerization of ε-caprolactone.
Claim 2
Dependent Claim
58 words
A non-magnetic electrophotographic toner which comprises a binder resin, and a coloring agent, the binder resin containing a thermoplastic lactone-modified epoxy resin having a lactone content of 3 to 90% by weight, obtained by subjecting all or a portion of secondary hydroxyl groups of epoxy compounds having hydroxyl groups in the molecules to ring opening polymerization of ε-caprolactone.
Claim 3
Dependent Claim
18 words
A non-magnetic electrophotographic toner according to claim 1, wherein the lactone content is 3 to 80% by weight.
Claim 4
Dependent Claim
65 words
A non-magnetic electrophotographic toner which comprises a binder resin and a coloring agent, the binder resin containing: (1) a ε-caprolactone-modified epoxy resin having a lactone content of 3 to 90% by weight, obtained by subjecting all or a portion of secondary hydroxyl groups of epoxy compounds having hydroxyl groups in the molecules to ring opening polymerization of ε-caprolactone, (2) styrene-butadiene rubber, and (3) polyester resin.
Claim 5
Dependent Claim
65 words
A non-magnetic electrophotographic toner which comprises a binder resin and a coloring agent, the binder resin containing: (1) a ε-caprolactone-modified epoxy resin having a lactone content of 3 to 90% by weight, obtained by subjecting all or a portion of secondary hydroxyl groups of epoxy compounds having hydroxyl groups in the molecules to ring opening polymerization of ε-caprolactone, (2) styrene-butadiene rubber, and (3) polyester resin.
Claim 6
Dependent Claim
40 words
A non-magnetic electrophotographic toner according to claim 3, wherein the binder resin contains 5 to 30% by weight of the styrene-butadiene rubber and 5 to 50% by weight of the polyester resin on the basis of the total binder resin.
Claim 7
Dependent Claim
32 words
A non-magnetic electrophotographic toner according to claim 4, wherein the styrene-butadiene rubber of the binder resin is a partially cross-linked styrene-butadiene rubber having a gel content of 10 to 50% by weight.
Claim 8
Dependent Claim
107 words
A non-magnetic electrophotographic toner which comprises a binder resin and a coloring agent, the binder resin containing: (1) a ε-caprolactone modified epoxy resin having a lactone content of 3 to 90% by weight, obtained by subjecting all or a portion of secondary hydroxyl groups of epoxy compounds having hydroxyl groups in the molecules to ring opening polymerization of ε-caprolactone, (2) 5 to 30% by weight of styrene-butadiene rubber on the basis of total binder resin, and (3) 5 to 50% by weight of polyester resin on the basis of total binder resin, and the toner having a melt viscosity of 100 to 10,000 poises at 160° C.
Claim 9
Dependent Claim
107 words
A non-magnetic electrophotographic toner which comprises a binder resin and a coloring agent, the binder resin containing: (1) a ε-caprolactone modified epoxy resin having a lactone content of 3 to 90% by weight, obtained by subjecting all or a portion of secondary hydroxyl groups of epoxy compounds having hydroxyl groups in the molecules to ring opening polymerization of ε-caprolactone, (2) 5 to 30% by weight of styrene-butadiene rubber on the basis of total binder resin, and (3) 5 to 50% by weight of polyester resin on the basis of total binder resin, and the toner having a melt viscosity of 100 to 10,000 poises at 160° C.
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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) | 1993-12-17 | 1994-06-18 | 1994-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-17 | 1998-06-18 | 1998-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-17 | 2002-06-18 | 2002-12-18 | $7700.00 | Window Closed / Lapsed |