Patent US5317060A successfully refreshed from Google Patents.
US5317060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing composite resin for toner
Assignee: Fujikura Kasei Co Ltd
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Filing: 1992-11-30
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Granted: 1994-05-31
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Expires: 2012-11-30
Abstract
Abstract A process for producing a composite resin for a toner, comprising the steps of: mixing, in water, (a) a low-molecular weight polymer powder comprising particles, not less than 80% by weight of the particles having a diameter of from 20 to 2000 microns with (b) a high-molecular weight polymer emulsion; subjecting the thus obtained mixture to a coagulation treatment; and heating the resulting mixture to obtain a composite resin in which the low-molecular weight polymer particle and the high-molecular weight polymer are fixed and homogeneously mixed with each other.
Inventors
- 👤 Yutaka Kukimoto
- 👤 Hikoji Ueda
- 👤 Kozo Suzuki
- 👤 Yoshihiko Koshiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:42
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0802; G03G9/0812; C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/08; C08L25/14; G03G9/0804; C08L2205/00; C08L2205/02; G03G9/081
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
126 words
A process for producing a composite resin for a toner, comprising the steps of: mixing, in water, (a) low-molecular weight polymer powder comprising particles, not less than 80% by weight of said particles having a diameter of from 20 to 2000 microns, the weight average molecular weight of said low-molecular weight polymer being in the range of from 5,000 to 100,000, with (b) a high-molecular weight polymer emulsion, the weight average molecular weight of said high-molecular weight polymer being in the range of from 500,000 to 5,000,000; subjecting the thus obtained mixture to a coagulation treatment; and heating the resulting mixture to obtain a composite resin in which the low-molecular weight polymer particle and the high-molecular weight polymer are fixed and homogeneously mixed with each other.
Claim 2
Dependent Claim
126 words
A process for producing a composite resin for a toner, comprising the steps of: mixing, in water, (a) low-molecular weight polymer powder comprising particles, not less than 80% by weight of said particles having a diameter of from 20 to 2000 microns, the weight average molecular weight of said low-molecular weight polymer being in the range of from 5,000 to 100,000, with (b) a high-molecular weight polymer emulsion, the weight average molecular weight of said high-molecular weight polymer being in the range of from 500,000 to 5,000,000; subjecting the thus obtained mixture to a coagulation treatment; and heating the resulting mixture to obtain a composite resin in which the low-molecular weight polymer particle and the high-molecular weight polymer are fixed and homogeneously mixed with each other.
Claim 3
Dependent Claim
48 words
The process according to claim 1, wherein the proportions of mixing the low-molecular weight polymer powder and the high-molecular weight polymer emulsion (in solid basis) are in the range of from 65 to 95% by weight and in the range of from 35 to 5% by weight, respectively.
Claim 4
Dependent Claim
47 words
The process according to claim 2 in which the weight average molecular weight of said low molecular weight polymer is in the range of 8,000 to 60,000 and the weight average molecular weight of said high molecular weight polymer is in the range of 2,000,000 to 5,000,000.
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) | 1997-05-30 | 1997-11-29 | 1998-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-30 | 2001-11-29 | 2002-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-30 | 2005-11-29 | 2006-05-31 | $7700.00 | Window Closed / Lapsed |