US4839255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing toner for developing electrostatic images
Assignee: Canon Inc
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Filing: 1988-03-29
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Granted: 1989-06-13
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Expires: 2008-03-29
Abstract
Abstract A toner for producing electrostatic latent images is produced by mixing base particles (A) with specific modifier particles (B) to attach the modifier particles (B) to the surfaces of the base particles (A), and passing the resultant mixture through a specific impact zone thereby to fix the modifier particles (B) to the base particles (A) under the action of a mechanical impact force.
Inventors
- 👤 Yoshihiko Hyosu
- 👤 Norio Hikake
- 👤 Katsuhiko Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:51
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0802; G03G9/0808
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
133 words
A process for producing a toner for developing electrostatic latent images comprising: mixing resinous base particles (A) comprising at least a binder resin with modifier particles (B) comprising a colorant or a charge controller thereby to attach the modifier particles (B) to the surfaces of the base particles (A); and introducing the base particles (A) and the modifier particles (B) to a fixing means which has an impact zone having a minimum clearance of 0.5-5 mm between a rotating member and a fixed member or between at least two rotating members, and passing the particles through the impact zone at a temperature of 10°-100° C., thereby to fix the modifier particles (B) to the surfaces of the base particles (A) under the action of a mechanical impact force exerted in the impact zone.
Claim 2
Dependent Claim
133 words
A process for producing a toner for developing electrostatic latent images comprising: mixing resinous base particles (A) comprising at least a binder resin with modifier particles (B) comprising a colorant or a charge controller thereby to attach the modifier particles (B) to the surfaces of the base particles (A); and introducing the base particles (A) and the modifier particles (B) to a fixing means which has an impact zone having a minimum clearance of 0.5-5 mm between a rotating member and a fixed member or between at least two rotating members, and passing the particles through the impact zone at a temperature of 10°-100° C., thereby to fix the modifier particles (B) to the surfaces of the base particles (A) under the action of a mechanical impact force exerted in the impact zone.
Claim 3
Dependent Claim
27 words
A process according to claim 1, wherein the rotating member rotates to that the tip thereof forming the minimum clearance has a peripheral speed of 30-150 m/sec.
Claim 4
Dependent Claim
22 words
A process according to claim 2, wherein the rotating member rotates so that said tip has a peripheral speed of 30-130 m/sec.
Claim 5
Dependent Claim
27 words
A process according to claim 1, wherein the modifier particles (B) are fixed to the surfaces of the base particles (A) at a temperature of 20°-100° C.
Claim 6
Dependent Claim
27 words
A process according to claim 4, wherein the modifier particles (B) are fixed to the surfaces of the base particles (A) at a temperature of 20°-90° C.
Claim 7
Dependent Claim
27 words
A process according to claim 5, wherein the modifier particles (B) are fixed to the surfaces of the base particles (A) at a temperature of 30°-70° C.
Claim 8
Dependent Claim
32 words
A process according to claim 1, wherein the base particles (A) and the modifier particles (B) are introduced into the impact zone so that the total residence time therein is 0.2-12 sec.
Claim 9
Dependent Claim
28 words
A process according to claim 7, wherein the base particles (A) and the modifier particles (B) are recycled so that they pass through the impact zone plural times.
Claim 10
Dependent Claim
19 words
A process according to claim 1, wherein the base particles (A) have a volume-average particle size of 2-20 microns.
Claim 11
Dependent Claim
26 words
A process according to claim 1, wherein the modifier particles (B) have a volume-average particle size of 0.2 or less that of the base particles (A).
Claim 12
Dependent Claim
40 words
A process according to claim 1, wherein the modifier particles (B) are mixed with hydrophobic silica and then mixed with the base particles (A), and thereafter the modifier particles (B) are fixed to the surfaces of the base particles (A).
Claim 13
Dependent Claim
38 words
A process according to claim 1, wherein the base particles (A) are mixed with the modifier particles (B) at a temperature of 0°-50° C. for 1-60 min. by means of a mixer having a stirring vane, before fixing.
Claim 14
Dependent Claim
22 words
A process according to claim 1, wherein the base particles (A) comprise a binder resin having a softening point of 90°-150° C.
Claim 15
Dependent Claim
20 words
A process according to claim 13, wherein the base particles (A) comprise a binder resin of a crosslinked styrene-type copolymer.
Claim 16
Dependent Claim
19 words
A process according to claim 1, wherein the base particles (A) comprise a binder resin of a polyester resin.
Claim 17
Dependent Claim
50 words
A process according to claim 1, wherein the base particles (A) contain a colorant, and the modifier particles comprising a charge controller (B2) have a volume-average particle size which is 0.2 or less times that of the base particles (A) and have a triboelectric chargeability of 3 μc/g or above.
Claim 18
Dependent Claim
33 words
A process according to claim 16, wherein the modifier particles (B2) are fixed to the surfaces of the base particles (A) under the action of an impact force at a coverage of 0.1-50%.
Claim 19
Dependent Claim
17 words
A process according to claim 16, wherein the modifier particles (B2) comprise a charge controller as such.
Claim 20
Dependent Claim
18 words
A process according to claim 16, wherein the modifier particles (B2) comprise a charge controller and a resin.
Claim 21
Dependent Claim
25 words
A process according to claim 19, wherein the modifier particles (B2) comprise a resin having a glass transition temperature (Tg) of 50° C. or above.
Claim 22
Dependent Claim
22 words
A process according to claim 16, wherein the base particles (A) and the modifier particles (B2) are respectively prepared through suspension polymerization.
Claim 23
Dependent Claim
20 words
A process according to claim 21, wherein the base particles (A) comprise a binder resin of a crosslinked vinyl-type copolymer.
Claim 24
Dependent Claim
29 words
A process according to claim 1, wherein the modifier particles comprising a colorant (B1) have a volume-average particle size of 0.2 or less that of the base particles (A).
Claim 25
Dependent Claim
24 words
A process according to claim 23, wherein the base particles (A) do not contain the colorant which is used in the modifier particles (B1).
Claim 26
Dependent Claim
18 words
A process according to claim 24, wherein the base particles (A) are colorless particles containing substantially no colorant.
Claim 27
Dependent Claim
16 words
A process according to claim 23, wherein the modifier particles (B1) comprise the colorant as such.
Claim 28
Dependent Claim
17 words
A process according to claim 23, wherein the modifier particles (B1) comprise a resin and the colorant.
Claim 29
Dependent Claim
25 words
A process according to claim 27, wherein the modifier particles (B1) comprise a resin having a glass transition temperature (Tg) of 50° C. or above.
Claim 30
Dependent Claim
22 words
A process according to claim 23, wherein the base particles (A) and the modifier particles (B1) are respectively prepared through suspension polymerization.
Claim 31
Dependent Claim
20 words
A process according to claim 29, wherein the base particles (A) comprise a binder resin of a crosslinked vinyl-type copolymer.
Claim 32
Dependent Claim
34 words
A process according to claim 23, wherein the modifier particles (B1) are fixed to the surfaces of the base particles (A) under the action of a mechanical impact force at a coverage of 30-80%.
Claim 33
Dependent Claim
27 words
A process according to claim 16, wherein the modifier particles (B2) are fixed to the surfaces of the base particles (A) at a temperature of 20°-90° C.
Claim 34
Dependent Claim
27 words
A process according to claim 24, wherein the modifier particles (B1) are fixed to the surfaces of the base particles (A) at a temperature of 20°-90° C.
References Cited (Backward Citations)
US4288519A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |