US5407773A
Expired / Lapsed
US
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Thermal fixing-type developer material for electrophotography
Assignee: Mitsui Chemicals Inc
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Filing: 1993-02-17
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Granted: 1995-04-18
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Expires: 2013-02-17
Abstract
Abstract PCT No. PCT/JP93/00194 Sec. 371 Date Oct. 15, 1993 Sec. 102(e) Date Oct. 15, 1993 PCT Filed Feb. 17, 1993 PCT Pub. No. WO93/16416 PCT Pub. Date Aug. 19, 1993.A thermal fixing-type developer material for electrophotography comprising a propylene- alpha -olefin copolymer wax (A) having a number average molecular weight (Mn) in the range of from 7,000 to 12,000; a binder (B); and a colorant (C). There is provided a thermal fixing-type developer material for electrophotography which, when used as a main component for an electrostatic toner, would provide a reprographic image which exhibits good release properties upon thermal fixing, a reduced adhesion to the heated roller or the photoreceptor, no offset or contamination, and a good fixing of the fixed image, and prevent the heated roll and the photoreceptor from undergoing contamination.
Inventors
- 👤 Harumi Furuta
- 👤 Seiji Ohta
- 👤 Hajime Inagaki
- 👤 Mituhiko Onda
- 👤 Toshinobu Abiru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:10
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08775; G03G9/08782; G03G9/08702; G03G9/08704
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
139 words
A thermal fixing developer material for electrophotography comprising (A) a propylene-α-olefin copolymer wax having a number average molecular weight (Mn) in the range of from 7,000 to 12,000, said α-olefin in said propylene-α-olefin copolymer wax comprising at least one member selected from the group consisting of ethylene and α-olefins having 4 to 6 carbon atoms, said propylene-α-olefin copolymer wax having a propylene content of at least 90 mole%, said propylene-α-olefin copolymer wax comprising a lower molecular weight portion and a remaining higher molecular weight portion and having a ratio X R of X L /X H in the range of from 1.80 to 2.50, X L representing an average α-olefin content of the lower molecular weight portion and X H representing an average α-olefin content of the remaining higher molecular weight portion: (B) a binder; and (C) a colorant.
Claim 2
Dependent Claim
139 words
A thermal fixing developer material for electrophotography comprising (A) a propylene-α-olefin copolymer wax having a number average molecular weight (Mn) in the range of from 7,000 to 12,000, said α-olefin in said propylene-α-olefin copolymer wax comprising at least one member selected from the group consisting of ethylene and α-olefins having 4 to 6 carbon atoms, said propylene-α-olefin copolymer wax having a propylene content of at least 90 mole%, said propylene-α-olefin copolymer wax comprising a lower molecular weight portion and a remaining higher molecular weight portion and having a ratio X R of X L /X H in the range of from 1.80 to 2.50, X L representing an average α-olefin content of the lower molecular weight portion and X H representing an average α-olefin content of the remaining higher molecular weight portion: (B) a binder; and (C) a colorant.
Claim 3
Dependent Claim
25 words
The thermal fixing developer material for electrophotography according to claim 1, wherein said ratio X R is in the range of from 1.80 to 2.40.
Claim 4
Dependent Claim
30 words
The thermal fixing developer material for electrophotogaphy according to claim 1, wherein said propylene-α-olefin copolymer wax has a number average molecular weight in the range of from 7,500 to 10,000.
Claim 5
Dependent Claim
28 words
The thermal fixing developer material for electrophotography according to claim 1, wherein said propylene-α-olefin copolymer wax is a propylene-ethylene copolymer wax having an isotacticity of at least 88%.
Claim 6
Dependent Claim
18 words
The thermal fixing developer material for electrophotography according to claim 1, wherein said binder comprises a thermoplastic resin.
Claim 7
Dependent Claim
72 words
The thermal fixing developer material for electrophotography according to claim 5, wherein said thermoplastic resin is selected from the group consisting of a styrene polymer, a ketone resin, a maleic acid resin, an aliphatic polyester resin, an aromatic polyester resin, a coumaron resin, a phenol resin, an epoxy resin, a terpene resin, a polyvinyl butyral, a polybutyl methacrylate, a polyvinyl chloride, a polyethylene, a polypropylene, a polybutadiene and an ethylene-vinyl acetate copolymer.
Claim 8
Dependent Claim
27 words
The thermal fixing developer material for electrophotography according to claim 6, wherein said thermoplastic resin is a styrene polymer comprising a styrene monomer and another vinyl monomer.
Claim 9
Dependent Claim
25 words
The thermal fixing developer material for electrophotography according to claim 7, wherein said styrene polymer has a number average molecular weight of at least 2,000.
Claim 10
Dependent Claim
26 words
The thermal fixing developer material for electrophotography according to claim 8, wherein said styrene polymer has a number average molecular weight of from 3,000 to 30,000.
Claim 11
Dependent Claim
26 words
The thermal fixing developer material for electrophotography according to claim 7, wherein said styrene monomer is present in an amount of at least 25% by weight.
Claim 12
Dependent Claim
24 words
The thermal fixing developer material for electrophotography according to claim 1, wherein said colorant is selected from the group consisting of pigments and dyes.
Claim 13
Dependent Claim
50 words
The thermal fixing developer material for electrophotography according to claim 1, wherein said colorant is selected from the group consisting of carbon black, phthalocyanine blue, aniline blue, arcooil blue, chrome yellow, ultramarine blue, quinoline yellow, lamp black, rose Bengal, diazo yellow, rhodamine B lake, carmine 6B, quinacridones and mixtures thereof.
Claim 14
Dependent Claim
24 words
The thermal fixing developer material for electrophotography according to claim 1, wherein the propylene-α-olefin copolymer wax/binder/colorant weight ratio is 1 to 20/100/1 to 20.
Claim 15
Dependent Claim
21 words
The thermal fixing developer material for electrophotography according to claim 13, wherein said weight ratio is 1 to 10/100/1 to 10.
References Cited (Backward Citations)
US4988598A
Cited
JPS4965232A
Cited
EP0103967A1
Cited
US4535049A
Cited
JPS59188657A
Cited
JPS60230663A
Cited
US4556624A
Cited
US4810612A
Cited
JPS6336263A
Cited
JPS6415754A
Cited
JPH01234857A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-04-17 | 1998-10-17 | 1999-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-17 | 2002-10-17 | 2003-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-17 | 2006-10-17 | 2007-04-18 | $7700.00 | Window Closed / Lapsed |