Patent US4246332A successfully refreshed from Google Patents.
US4246332A
Expired / Lapsed
US
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Electrophotographic toner comprising low and high molecular weight blend of binder resins
Assignee: Fujifilm Business Innovation Corp
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Filing: 1979-02-27
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Granted: 1981-01-20
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Expires: 1999-02-27
Abstract
Abstract An electrophotographic toner comprising a binder resin and a colorant dispersed therein wherein the binder resin comprises about 50 to 95% by weight of a low temperature melting, high fluidity resin having a number average molecular weight of about 1,000 to 4,000, a glass transition temperature of about 40° to 60° C. and a melt index at 110° C. of about 50 to 200 g/10 min or a mixture thereof, and about 5 to 50% by weight of a high molecular weight polymer having a glass transition temperature of about 35° to 60° C. and a weight average molecular weight of more than about 500,000.
Inventors
- 👤 Koichi Tanaka
- 👤 Kenji Kobayashi
- 👤 Shigeo Aonuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:56
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08784; G03G9/08797; G03G9/08795
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
141 words
An electrophotographic toner for heat roll fixation comprising a binder resin and a colorant dispersed therein wherein the binder resin comprises about 50 to 95% by weight of a low temperature melting, high fluidity resin selected from the group consisting of a polyester resin, an epoxy resin, and a vinyl polymer and having a number average molecular weight of about 1,000 to 4,000, a glass transition temperature of about 40° to 60° C. and a melt index at 110° C. of about 50 to 200 g/10 min or a mixutre thereof, and about 5 to 50% by weight of a high molecular weight polymer selected from the group consisting of an acrylic-type polymer and a styrene based polymer and having a glass transition temperature of about 35° to 60° C. and a weight average molecular weight of more than about 500,000.
Claim 2
Dependent Claim
141 words
An electrophotographic toner for heat roll fixation comprising a binder resin and a colorant dispersed therein wherein the binder resin comprises about 50 to 95% by weight of a low temperature melting, high fluidity resin selected from the group consisting of a polyester resin, an epoxy resin, and a vinyl polymer and having a number average molecular weight of about 1,000 to 4,000, a glass transition temperature of about 40° to 60° C. and a melt index at 110° C. of about 50 to 200 g/10 min or a mixutre thereof, and about 5 to 50% by weight of a high molecular weight polymer selected from the group consisting of an acrylic-type polymer and a styrene based polymer and having a glass transition temperature of about 35° to 60° C. and a weight average molecular weight of more than about 500,000.
Claim 3
Dependent Claim
114 words
The electrophotographic toner of claim 1, wherein said low temperature melting, high fluidity resin is a polyester resin which is the reaction product of a divalent alcohol selected from the group consisting of ethyleneglycol, triethyleneglycol, 1,2-propyleneglycol, 1,3-propyleneglycol, 1,4-butanediol, neopentylglycol, 1,4-butenediol, 1,4-bis(hydroxymethyl)cyclohexane, bisphenol A, hydrogenated bisphenol A and polyoxyethylenated bisphenol A; a dibasic acid selected from the group consisting of maleic acid, fumaric acid, mesaconic acid, citraconic acid, itaconic acid, glutaconic acid, phthalic acid, isophthalic acid, terephthalic acid, cyclohexanedicarboxylic acid, succinic acid, adipic acid, sebacic acid and malonic acid, or acid anhydrides or lower alcohol esters thereof; and, optionally, a member selected from the group consisting of glycerin, trimethanolpropane, pentaerythritol, trimellitic acid and pyromellitic acid.
Claim 4
Dependent Claim
18 words
The electrophotographic toner of claim 1, wherein said low temperature melting, high fluidity resin is an epoxy resin.
Claim 5
Dependent Claim
95 words
The electrophotographic toner of claim 1, wherein said low temperature melting, high fluidity resin is a vinyl polymer which is the reaction product of a functional group-containing monomer selected from the group consisting of acrylic acid, methacrylic acid, maleic acid, hydroxyethyl methacrylate, hydroxypropyl acrylate, glycidyl methacrylate, glycidyl acrylate, alkoxymethylolacrylamide and allyl alcohol; a monomer selected from the group consisting of styrene, vinyltoluene, methylstyrene, acrylonitrile and methylacrylonitrile; and, optionally, a monomer selected from the group consisting of methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, cyclohexyl methacrylate and stearyl methacrylate.
Claim 6
Dependent Claim
23 words
The electrophotographic toner of claim 1, wherein said high molecular weight polymer has a weight average molecular weight of up to about 4,000,000.
Claim 7
Dependent Claim
15 words
The electrophotographic toner of claim 1, wherein said colorant is a pigment or a dye.
Claim 8
Dependent Claim
31 words
The electrophotographic toner of claim 1, wherein said colorant is a pigment present in an amount of about 3 to 20% by weight based on the total weight of the toner.
Claim 9
Dependent Claim
27 words
The electrophotographic toner of claim 1, wherein said toner has an average particle size expressed in weight % of the composition of less than about 30 microns.
Claim 10
Dependent Claim
17 words
The electrophotographic toner of claim 8, wherein said average particle size is about 4 to 20 microns.
Claim 11
Dependent Claim
16 words
The electrophotographic toner of claim 1, wherein said high molecular weight polymer is a cross-linked polymer.
Claim 12
Dependent Claim
33 words
The electrophotographic toner of claim 1, wherein said acrylic-type polymer is a terpolymer of a monomer containing a vinyl group, an acrylic or methacrylic acid ester, and a monomer containing a glycidyl group.
References Cited (Backward Citations)
US3965021A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |