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Patent US5001031A successfully refreshed from Google Patents.
US5001031A
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Electrophotographic toner comprising a color agent and a mixture of vinyl polymers as a binder
Assignee: Mitsui Chemicals Inc
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Filing: 1987-11-06
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Granted: 1991-03-19
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Expires: 2007-11-06
Abstract
Abstract An electrophotographic toner composition is provided. It contains a vinyl polymer having a number average molecular weight of 1,000-10,000, a weight average molecular weight/number average molecular weight ratio of 41-200, a glass transition temperature of 50°-70° C., and specific shear rates at 110° C. and 190° C. respectively. The toner composition affords vivid copy marks even when used in a small amount, and exhibits good fixing property even at low temperatures.
Inventors
- 👤 Takashi Yamamoto
- 👤 Masaaki Shin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:04
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08784; G03G9/08795; G03G9/08797; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105; Y10S525/00; Y10S525/934
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
76 words
An electrophotographic toner composition comprising a coloring agent and as a binder a mixture of vinyl polymers having a number average molecular weight of 1,000-10,000, a weight average molecular weight/number average molecular weight ratio of 41-200, a glass transition temperature of 50°-70° C., a 100° C. viscosity of 50,000-5,000,000 poise at a shear rate of 1 sec -1 , and a 190° C. viscosity of 10-1,000 poise at a shear rate of 10,000 sec -1 .
Claim 2
Dependent Claim
76 words
An electrophotographic toner composition comprising a coloring agent and as a binder a mixture of vinyl polymers having a number average molecular weight of 1,000-10,000, a weight average molecular weight/number average molecular weight ratio of 41-200, a glass transition temperature of 50°-70° C., a 100° C. viscosity of 50,000-5,000,000 poise at a shear rate of 1 sec -1 , and a 190° C. viscosity of 10-1,000 poise at a shear rate of 10,000 sec -1 .
Claim 3
Dependent Claim
28 words
The toner composition as claimed in claim 1, wherein the number average molecular weight is 2,000-8,000 and the weight average molecular weight/number average molecular weight ratio is 50-150.
Claim 4
Dependent Claim
16 words
The toner composition as claimed in claim 1, wherein the glass transition temperature is 50°-65° C.
Claim 5
Dependent Claim
42 words
The toner composition as claimed in claim 1, wherein the 110° C. viscosity is 50,000-3,500,000 poise at the shear rate of 1 sec -1 , and the 190° C. viscosity is 100-1,000 poise at the shear rate of 10,000 sec -1 .
Claim 6
Dependent Claim
21 words
A toner composition as claimed in claim 1 containing 5-20 wt. % of carbon black and 95-80% of the vinyl polymer.
Claim 7
Dependent Claim
17 words
The toner composition as claimed in claim 1, wherein the vinyl polymers are produced by solution polymerization.
References Cited (Backward Citations)
GB1495428A
Cited
GB2017949A
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GB2075703A
Cited
JPS607434A
Cited
US4652511A
Cited
US4857433A
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US4626488A
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JPS62191859A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-03-18 | 1994-09-17 | 1995-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-18 | 1998-09-17 | 1999-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-18 | 2002-09-17 | 2003-03-19 | $7700.00 | Window Closed / Lapsed |