US4863824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner for developing electrostatic latent image
Assignee: Kao Corp
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Filing: 1988-03-09
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Granted: 1989-09-05
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Expires: 2008-03-09
Abstract
Abstract A toner for developing electrostatic latent images which comprises a colorant and two kinds of polyester is disclosed. The fFirst polyester is a nonlinear polyester that is composed of monomers including monomers of trivalence or higher valency and which satisfies the following conditions A1 and A2, the second polyester is a nonlinear polyester that is composed of monomers including monomers of trivalence or higher valency and which satisfies the following conditions B1 and B2, and the difference between the softening points of said first and second polyesters is at least 10° C. condition A1: the monomers of trivalence or higher valency represent from 0.05 mol % to less than 15 mol % of all the monomers present; condition A2: the softening point is in the range of from 120° C. to 160° C.; condition B1: the monomers of trivalence or higher valency represent from 0.05 mol % to less than 15 mol % of all the monomers represent; condition B2: the softening point is in the range of from 80° C. to less than 120° C.
Inventors
- 👤 Masafumi Uchida
- 👤 Hiroyuki Takagiwa
- 👤 Satoru Ikeuchi
- 👤 Hideyo Nishikawa
- 👤 Shingo Tanaka
- 👤 Kuniyasu Kawabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:33
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08742; G03G9/08755; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
211 words
A toner for developing electrostatic latent images comprising a colorant and two kinds of polyester, the first polyester being a nonlinear polyester compound of monomers including monomers of at least trivalence and which satisfies conditions A1 and A2, the second polyester being a nonlinear polyester composed of monomers including monomers of at least trivalence and which satisfies conditions B1 and B2, the difference between the softening points of said first and second polyesters being at least 10° C.: condition A1: the monomers of trivalence or higher valency represent from 0.05 mol % to less than 15 mol % of all the monomers present; condition A2: the softening point is in the range of from 20° to 60° C.; condition B1: the monomers of trivalence or higher valency represent from 0.05 mol % to less than 15 mol % of all the monomers present; condition B2: the softening point is in the range of from 80° C. to less than 120° C.; each of said first and second polyesters comprising monomers containing a diol component represented by the following general formula (1): ##STR2## wherein R is an ethylene or propylene group; and x and y are each an integer, with the average of the sum x and y being 2 to 7.
Claim 2
Dependent Claim
211 words
A toner for developing electrostatic latent images comprising a colorant and two kinds of polyester, the first polyester being a nonlinear polyester compound of monomers including monomers of at least trivalence and which satisfies conditions A1 and A2, the second polyester being a nonlinear polyester composed of monomers including monomers of at least trivalence and which satisfies conditions B1 and B2, the difference between the softening points of said first and second polyesters being at least 10° C.: condition A1: the monomers of trivalence or higher valency represent from 0.05 mol % to less than 15 mol % of all the monomers present; condition A2: the softening point is in the range of from 20° to 60° C.; condition B1: the monomers of trivalence or higher valency represent from 0.05 mol % to less than 15 mol % of all the monomers present; condition B2: the softening point is in the range of from 80° C. to less than 120° C.; each of said first and second polyesters comprising monomers containing a diol component represented by the following general formula (1): ##STR2## wherein R is an ethylene or propylene group; and x and y are each an integer, with the average of the sum x and y being 2 to 7.
Claim 3
Dependent Claim
28 words
A toner according to claim 1 wherein said first and second polyesters are incorporated at a weight ratio ranging from 90:10 to 30:70, preferably from 80:20 to 40:60.
Claim 4
Dependent Claim
34 words
A toner according to claim 1 wherein the first polyester has a glass transition point of 45° to 85° C. and the second polyester has a glass transition point of 40° to 80° C.
Claim 5
Dependent Claim
34 words
A toner according to claim 2 wherein the first polyester has a glass transition point of 45° to 85° C. and the second polyester has a glass transition point of 40° to 80° C.
Claim 6
Dependent Claim
40 words
A toner according to claim 4 wherein the first polyester contains chloroform insolubles in amounts of from 0 to 25 wt % and the second polyester contains chloroform insolubles in amounts of from 0 to less than 5 wt %.
Claim 7
Dependent Claim
13 words
A toner according to claim 1 which further contains a low-molecular weight polyolefin.
Claim 8
Dependent Claim
13 words
A toner according to claim 5 which further contains a low-molecular weight polyolefin.
Claim 9
Dependent Claim
12 words
A toner according to claim 1 which further comprises a magnetic material.
Claim 10
Dependent Claim
12 words
A toner according to claim 5 which further comprises a magnetic material.
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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) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |