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US4108653A
Expired / Lapsed
US
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Pressure-fixable toner powder with a thermoplastic polyethylene binder
Assignee: Canon Production Printing Holding BV
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Filing: 1976-10-26
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Granted: 1978-08-22
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Expires: 1996-10-26
Abstract
Abstract Polyethylene having an average molecular weight of at least 1,500, a crystallinity of at least 75% and a density of at least 0.93 has been found advantageous as a base material for making pressure-fixable toner powder for developing electrostatic images. The toner powder can be fixed satisfactorily to image substrates by the pressure of fixing rollers of conventional electrophotographic copying apparatus, yet it can be produced readily by grinding a suitable composition based on the polyethylene. The polyethylene preferably has an average weight of between 2,000 and 10,000, a crystallinity of at least 80% and a density of at least 0.94. Especially advantageous pressure-fixable, electrically conductive toner powders are obtained from pigmented masses of the polyethylene in which 3 to 20% of the weight consists of carbon black having a specific surface of at least 750 m 2 /g, preferably of about 1,000 m 2 /g, and an oil absorption of between 250 and 400 ml/g.
Inventors
- 👤 Martinus T. J. Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:28
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08704; G03G15/00; G03G15/20; G03G15/2092
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
64 words
Pressure-fixable toner powder comprising particles which consist essentially of thermoplastic binder having dispersed therein colorant and, optionally, additives, characterized in that said binder comprises predominantly, in an amount rendering said particles readily fixable to a receiving surface by pressure, a polyethylene having a weight average molecular weight of at least 1,500, a crystallinity of at least 75% and a density of at least 0.93.
Claim 2
Dependent Claim
64 words
Pressure-fixable toner powder comprising particles which consist essentially of thermoplastic binder having dispersed therein colorant and, optionally, additives, characterized in that said binder comprises predominantly, in an amount rendering said particles readily fixable to a receiving surface by pressure, a polyethylene having a weight average molecular weight of at least 1,500, a crystallinity of at least 75% and a density of at least 0.93.
Claim 3
Dependent Claim
30 words
Toner powder according to claim 1, said polyethylene having an average molecular weight between 2,000 and 10,000, a crystallinity of at least 80%, and a density of at least 0.94.
Claim 4
Dependent Claim
24 words
Toner powder according to claim 1, said polyethylene constituting at least 70 percent by weight of the entire binder content in the toner powder.
Claim 5
Dependent Claim
32 words
Toner powder according to claim 1, said particles containing carbon black having a specific surface of at least 750 m 2 /g and an oil absorption of between 250 and 400 ml/g.
Claim 6
Dependent Claim
40 words
Toner powder according to claim 3, said particles containing between 3 and 20 percent by weight of carbon black having a specific surface of at least 750 m 2 /g and an oil absorption of between 250 and 400 ml/g.
Claim 7
Dependent Claim
49 words
Toner powder comprising selectively sized particles, ground from a solid mass, consisting essentially of thermoplastic binder composed predominantly of a polyethylene having an average molecular weight of approximately 2,500 to 3,000, a crystallinity greater than 80% and a density of at least 0.94, and pigment dispersed in said binder.
Claim 8
Dependent Claim
49 words
Toner powder comprising selectively sized particles, ground from a solid mass, consisting essentially of thermoplastic binder composed predominantly of a polyethylene having an average molecular weight of approximately 2,500 to 3,000, a crystallinity greater than 80% and a density of at least 0.94, and pigment dispersed in said binder.
Claim 9
Dependent Claim
17 words
Toner powder according to claim 6, said particles having on their surface fine particles of hydrophobic silica.
Claim 10
Dependent Claim
45 words
Process for forming fixed visible images comprising the steps of developing an electrostatic image with a toner powder, and fixing the resulting powder image on a substrate by applying pressure thereto, characterized in that said toner powder is a toner powder according to claim 1.
Claim 11
Dependent Claim
45 words
Process for forming fixed visible images comprising the steps of developing an electrostatic image with a toner powder, and fixing the resulting powder image on a substrate by applying pressure thereto, characterized in that said toner powder is a toner powder according to claim 5.
Claim 12
Dependent Claim
46 words
Process for forming fixed visible images comprising the steps of developing an electrostatic image with a toner powder , and fixing the resulting powder image on a substrate by applying pressure thereto, characterized in that said toner powder is a toner powder according to claim 6.
Claim 13
Dependent Claim
59 words
Toner powder according to claim 6, a major proportion of said pigment being titanium dioxide and a minor proportion thereof, amounting to about 10 to 15 percent of the weight of said particles, being carbon black having a specific surface of the order of about 1,000 m 2 /g and an oil absorption of between 250 and 400 ml/g.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-21 | 1982-02-20 | 1982-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-21 | 1986-02-20 | 1986-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-21 | 1990-02-20 | 1990-08-22 | $7700.00 | Window Closed / Lapsed |