Patent FR2647005A1 successfully refreshed from Google Patents.
US4133774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing direct imaging pressure fixable magnetic toners
Assignee: Reprographic Materials Inc
•
Filing: 1977-09-29
•
Granted: 1979-01-09
•
Expires: 1997-09-29
Abstract
Abstract Novel pressure fixable direct imaging magnetic toners having a core of magnetic material held together with an adhesive resin, a barrier substantially covering the core, an overcoat of thermoplastic strengthening resin, and an outer conductive layer, together with novel processes for producing such toners, these processes comprising dispersion of the core material followed by agglomeration of the several layers in a single aqueous medium.
Inventors
- 👤 Carl Brynko
- 👤 Carl G. Brynko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:04
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/083; G03G9/0831; G03G9/0833; G03G9/0825; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2989
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
105 words
A process for preparing direct imaging, pressure fixable particulate magnetic toners which process is carried out in an aqueous medium and comprises dispersing a particulate magnetic material in the aqueous medium; adding a pressure-sensitive adhesive organic resin; adding a surfactant and agglomerating agent to agglomerate the magnetic material and pressure-sensitive adhesive and form a barrier layer over the agglomerate particles; adding a strengthening resin emulsion to the aqueous agglomerate-containing medium and encapsulating the agglomerate particles and barrier layer to provide a strengthening coat over the barrier layer; and adding an emulsion of a conductive material to provide an outer conductive layer on the strengthening coat.
Claim 2
Dependent Claim
105 words
A process for preparing direct imaging, pressure fixable particulate magnetic toners which process is carried out in an aqueous medium and comprises dispersing a particulate magnetic material in the aqueous medium; adding a pressure-sensitive adhesive organic resin; adding a surfactant and agglomerating agent to agglomerate the magnetic material and pressure-sensitive adhesive and form a barrier layer over the agglomerate particles; adding a strengthening resin emulsion to the aqueous agglomerate-containing medium and encapsulating the agglomerate particles and barrier layer to provide a strengthening coat over the barrier layer; and adding an emulsion of a conductive material to provide an outer conductive layer on the strengthening coat.
Claim 3
Dependent Claim
19 words
A process according to claim 1 wherein the magnetic material is barium titanate, chromium dioxide, or an iron oxide.
Claim 4
Dependent Claim
12 words
A process according to claim 1 wherein the magnetic material is magnetite.
Claim 5
Dependent Claim
26 words
A process according to claim 1 wherein the pressure-sensitive adhesive is polyvinyl acetate, polyethylene emulsion, non-elastomeric low-melting acrylic resin, an elastomeric resin, or a mixture thereof.
Claim 6
Dependent Claim
19 words
A process according to claim 1 wherein the agglomerating agent has a melting temperature of at least 100° C.
Claim 7
Dependent Claim
20 words
A process according to claim 1 wherein the agglomerating agent is gelatin or a non-gelatin water-soluble polymer or a colloid.
Claim 8
Dependent Claim
22 words
A process according to claim 1 wherein the strengthening resin has a melting point in the range of 100° to 150° C.
Claim 9
Dependent Claim
35 words
A process according to claim 1 wherein the conductive material is a resin having a conductivity when dry of from 10 -2 to 10 -10 mho/centimeter or a mixture of a resin and conductive particles.
Claim 10
Dependent Claim
13 words
A process according to claim 8 wherein the conductive particles are carbon black.
Claim 11
Dependent Claim
15 words
A process according to claim 1 wherein the particles having a conductive layer are dried.
Claim 12
Dependent Claim
12 words
A process according to claim 10 wherein the particles are spray dried.
Claim 13
Dependent Claim
20 words
A process according to claim 10 wherein the temperature of the particles during drying does not exceed about 100° C.
References Cited (Backward Citations)
US3280741A
Cited
US3196032A
Cited
US3698005A
Cited
US3745118A
Cited
US3788994A
Cited
US4016099A
Cited
US3925217A
Cited
DE2456432A1
Cited
DE2606936A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |