US4617249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersion polymerization process for toner compositions
Assignee: Xerox Corp
•
Filing: 1985-07-16
•
Granted: 1986-10-14
•
Expires: 2005-07-16
Abstract
Abstract Disclosed is an improved process for the preparation of polymer particles which comprises (1) providing a solvent medium having dispersed therein steric stabilizers, monomers, and initiator compounds; (2) subsequently adding thereto a crosslinking compound; (3) affecting polymerization of the resulting mixture by heating; and (4) thereafter separating the particles formed.
Inventors
- 👤 Christopher K. Ober
- 👤 Kar P. Lok
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:31
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0802; G03G9/0804; C; C08; C08F; C08F2/00; C08F2/04; C08F2/06; C08F2/08; G03G9/0806
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
81 words
An improved dispersion polymerization process for the preparation of polymer particles consisting essentially of (1) providing a solvent medium having dispersed therein steric stabilizers selected from the group consisting of hydroxy celluloses, poly(acrylic acid), poly(vinyl butyral), poly(vinyl pyridines), poly(vinyl pyrrolidone), and their copolymers, monomers, and initiator compounds; (2) subsequently adding thereto a crosslinking compound; (3) affecting polymerization of the resulting mixture by heating; and (4) thereafter separating the particles formed of a diameter of from about 5 to about 20 microns.
Claim 2
Dependent Claim
81 words
An improved dispersion polymerization process for the preparation of polymer particles consisting essentially of (1) providing a solvent medium having dispersed therein steric stabilizers selected from the group consisting of hydroxy celluloses, poly(acrylic acid), poly(vinyl butyral), poly(vinyl pyridines), poly(vinyl pyrrolidone), and their copolymers, monomers, and initiator compounds; (2) subsequently adding thereto a crosslinking compound; (3) affecting polymerization of the resulting mixture by heating; and (4) thereafter separating the particles formed of a diameter of from about 5 to about 20 microns.
Claim 3
Dependent Claim
14 words
A process in accordance with claim 1 wherein the crosslinking compound is divinyl benzene.
Claim 4
Dependent Claim
23 words
A process in accordance with claim 1 wherein polymerization is affected at a temperature of from about 50° C. to about 95° C.
Claim 5
Dependent Claim
12 words
A process in accordance with claim 1 wherein the monomer is styrene.
Claim 6
Dependent Claim
51 words
A process in accordance with claim 1 wherein from about 10 percent to about 40 percent by volume of monomer, from about 0.5 percent to about 5 percent by weight of steric stabilizer, and from about 0.1 percent by weight to about 1.0 percent by weight of crosslinking compound are selected.
Claim 7
Dependent Claim
24 words
A process in accordance with claim 1 wherein the resulting particles have a fusing temperature of from about 100° C. to about 150° C.
Claim 8
Dependent Claim
87 words
An improved dispersion polymerization process for obtaining toner particles consisting essentially of (1) providing a solvent having dispersed therein steric stabilizers selected from the group consisting of hydroxy celluloses, poly(acrylic acid), poly(vinyl butyral), poly(vinyl pyridines), poly(vinyl pyrrolidone), and their copolymers, monomers, and initiator compounds; (2) subsequently adding thereto a crosslinking compound; (3) affecting polymerization of the resulting mixture by heating; (4) thereafter separating the particles formed of a diameter of from about 5 to about 20 microns; and (5) mixing the particles resulting with a dye solution.
Claim 9
Dependent Claim
87 words
An improved dispersion polymerization process for obtaining toner particles consisting essentially of (1) providing a solvent having dispersed therein steric stabilizers selected from the group consisting of hydroxy celluloses, poly(acrylic acid), poly(vinyl butyral), poly(vinyl pyridines), poly(vinyl pyrrolidone), and their copolymers, monomers, and initiator compounds; (2) subsequently adding thereto a crosslinking compound; (3) affecting polymerization of the resulting mixture by heating; (4) thereafter separating the particles formed of a diameter of from about 5 to about 20 microns; and (5) mixing the particles resulting with a dye solution.
Claim 10
Dependent Claim
14 words
A process in accordance with claim 7 wherein the cross-linking compound is divinyl benzene.
Claim 11
Dependent Claim
23 words
A process in accordance with claim 7 wherein polymerization is affected at a temperature of from about 50° C. to about 95° C.
Claim 12
Dependent Claim
12 words
A process in accordance with claim 7 wherein the monomer is styrene.
Claim 13
Dependent Claim
51 words
A process in accordance with claim 7 wherein from about 10 percent to about 40 percent by volume of monomer, from about 0.5 percent to about 5 percent by weight of steric stabilizer, and from about 0.1 percent by weight to about 1.0 percent by weight of crosslinking compound are selected.
Claim 14
Dependent Claim
24 words
A process in accordance with claim 7 wherein the resulting particles have a fusing temperature of from about 100° C. to about 150° C.
References Cited (Backward Citations)
US31072A
Cited
US3401213A
Cited
US3941898A
Cited
USRE31072E
Cited
US4156034A
Cited
US4237257A
Cited
SU837965A1
Cited
US4287281A
Cited
US4486559A
Cited
US4448871A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-13 | 1990-04-14 | 1990-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-13 | 1994-04-14 | 1994-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-13 | 1998-04-14 | 1998-10-14 | $7700.00 | Window Closed / Lapsed |