Patent US1518303A successfully refreshed from Google Patents.
Patent US4849316A successfully refreshed from Google Patents.
US4849316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat fixing electrophotographic toner containing olefin wax
Assignee: Mitsui Chemicals Inc
•
Filing: 1988-12-13
•
Granted: 1989-07-18
•
Expires: 2008-12-13
Abstract
Abstract Resin composition containing vinyl polymer and olefin polymer for use in electrophotography, electrostatic recording and electrostatic printing and the like, more particularly the resin composition obtained by uniformly dispersing the olefin polymer in the vinyl polymer, and the toner containing this resin composition are disclosed.
Inventors
- 👤 Shoji Kawaski
- 👤 Hisatomo Sato
- 👤 Masaaki Shin
- 👤 Takashi Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:12
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0802; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/104
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
66 words
A resin composition for a heat-fixing electrophotographic toner obtained by providing a 50-90 wt./wt. % organic solvent solution containing 100 parts by weight of a vinyl polymer, mixing thereto 0.01-15 parts by weight of an olefin polymer having a number average molecular weight of 1,000 -50,000, and removing the solvent from the resulting mixture at 120°-250° C. and under an absolute pressure of 0 -200 mmHg.
Claim 2
Dependent Claim
66 words
A resin composition for a heat-fixing electrophotographic toner obtained by providing a 50-90 wt./wt. % organic solvent solution containing 100 parts by weight of a vinyl polymer, mixing thereto 0.01-15 parts by weight of an olefin polymer having a number average molecular weight of 1,000 -50,000, and removing the solvent from the resulting mixture at 120°-250° C. and under an absolute pressure of 0 -200 mmHg.
Claim 3
Dependent Claim
25 words
The resin composition as claimed in claim 1 wherein the organic solvent solution of the vinyl polymer has a concentration of 30 -70 wt. %.
Claim 4
Dependent Claim
21 words
The resin composition as claimed in claim 1 wherein the organic solvent is an aromatic compound, a ketone or an ester.
Claim 5
Dependent Claim
21 words
The resin composition as claimed in claim 1 wherein the solvent removal is carried out at a temperature of 150°-220° C.
Claim 6
Dependent Claim
23 words
The resin composition as claimed in claim 1 wherein the solvent removal is conducted by flashing the resulting mixture into a vacuum system.
Claim 7
Dependent Claim
20 words
The resin composition as claimed in claim 5 wherein the vacuum system is evacuated to a vacuum of 0-50 mmHg.
Claim 8
Dependent Claim
34 words
The resin composition as claimed in claim 1 wherein the organic solvent solution is obtained by subjecting a vinyl monomer to a solution polymerization, a bulk polymerization, a suspension polymerization or a combination thereof.
Claim 9
Dependent Claim
31 words
An electrophotographic toner containing a proportion of 30-95 parts by weight of the resin composition claimed in claim 1 and 70-5 parts by weight of a pigment or a magnetic material.
Claim 10
Independent Claim
68 words
A method for the preparation of a resin composition for electrophotographic toner which comprises providing a 50-90 wt./wt. % organic solvent solution containing 100 parts by weight of a vinyl polymer, mixing thereto 0.01-15 parts by weight of an olefin polymer having a number average molecular weight of 1,000-50,000, and removing the solvent from the resulting mixture at 120°-250° C. and under an absolute pressure of 0-200 mmHg.
Claim 11
Independent Claim
68 words
A method for the preparation of a resin composition for electrophotographic toner which comprises providing a 50-90 wt./wt. % organic solvent solution containing 100 parts by weight of a vinyl polymer, mixing thereto 0.01-15 parts by weight of an olefin polymer having a number average molecular weight of 1,000-50,000, and removing the solvent from the resulting mixture at 120°-250° C. and under an absolute pressure of 0-200 mmHg.
Claim 12
Dependent Claim
25 words
The method of preparation as claimed in claim 9 wherein the organic solvent solution of the vinyl polymer has a concentration of 30-70 wt. %.
Claim 13
Dependent Claim
22 words
The method of preparation as claimed in claim 9 wherein the organic solvent is an aromatic compound, a ketone or an ester.
Claim 14
Dependent Claim
22 words
The method of preparation as claimed in claim 9 wherein the solvent removal is carried out at a temperature of 150°-220° C.
Claim 15
Dependent Claim
24 words
The method of preparation as claimed in claim 9 wherein the solvent removal is conducted by flashing the resulting mixture into a vacuum system.
Claim 16
Dependent Claim
21 words
The method of preparation as claimed in claim 13 wherein the vacuum system is evacuated to a vacuum of 0-50 mmHg.
Claim 17
Dependent Claim
34 words
The method of preparation as claimed in claim 9 wherein the organic solvent is obtained by subjecting a vinyl monomer to a solution polymerization, a bulk polymerization, a suspension polymerization or a combination thereof.
Claim 18
Dependent Claim
33 words
The method of preparation as claimed in claim 9 wherein the composition contains 30-95 parts by weight of the resin composition and 70-5 parts by weight of a pigment or a magnetic material.
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) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |