Patent US5840456A successfully refreshed from Google Patents.
US5840456A
Expired / Lapsed
US
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Color toner comprising two binder resins of differing softening point
Assignee: Ricoh Co Ltd
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Filing: 1996-08-08
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Granted: 1998-11-24
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Expires: 2016-08-08
Abstract
Abstract A color toner includes a binder resin composition comprising a binder resin A with a softening point in the range of 85° to 110° C., and a binder resin B with a softening point in the range of 115° to 135° C., with the binder resin A and the binder resin B being compatible with each other; a coloring agent; and a wax with a melting point in the range of 65° to 90° C., which is not compatible with the binder resin composition and dispersed in the binder resin composition.
Inventors
- 👤 Masami Tomita
- 👤 Hiroshi Yaguchi
- 👤 Yasuo Asahina
- 👤 Yasuaki Iwamoto
- 👤 Satoru Miyamoto
- 👤 Tomomi Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:44
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08775; G03G9/08782; G03G9/08742; G03G9/08755; G03G9/08784; G03G9/08797
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
90 words
A color toner comprising: a binder resin composition comprising a binder resin A with a softening point in the range of 85° to 110° C., and a binder resin B with a softening point in the range of 115° to 135° C., said binder resin A and said binder resin B being compatible with each other; a coloring agent; and a wax with a melting point in the range of 65° to 90° C., which is not compatible with said binder resin composition and dispersed in said binder resin composition.
Claim 2
Dependent Claim
90 words
A color toner comprising: a binder resin composition comprising a binder resin A with a softening point in the range of 85° to 110° C., and a binder resin B with a softening point in the range of 115° to 135° C., said binder resin A and said binder resin B being compatible with each other; a coloring agent; and a wax with a melting point in the range of 65° to 90° C., which is not compatible with said binder resin composition and dispersed in said binder resin composition.
Claim 3
Dependent Claim
46 words
The color toner as claimed in claim 1, wherein each of said binder resin A and said binder resin B has a main peak in the range of 3.5 and 4.5 in terms of the logarithmic molecular weight LogM thereof in the respective molecular weight distribution.
Claim 4
Dependent Claim
28 words
The color toner as claimed in claim 1, wherein each of said binder resin A and said binder resin B comprises a polyester resin or a polyol resin.
Claim 5
Dependent Claim
28 words
The color toner as claimed in claim 2, wherein each of said binder resin A and said binder resin B comprises a polyester resin or a polyol resin.
Claim 6
Dependent Claim
220 words
The color toner as claimed in claim 3, wherein said polyester resin is a polyester resin obtained by condensation polymerization of: (a) a diol component of formula (I): ##STR11## wherein R 1 is an alkylene group having 2 to 4 carbon atoms; and x and y represent a positive integer, with the total sum of x and y having an average value of 2 to 16; and (b) at least one acid component selected from the group consisting of: (1) a dicarboxylic acid represented by formula (II) ##STR12## wherein R 2 is a saturated or unsaturated hydrocarbon group having 4 to 20 carbon atoms; (2) an anhydride of said dicarboxylic acid of formula (II); (3) a lower alkyl ester of said dicarboxylic acid of formula (II); (4) a dicarboxylic acid represented by formula (III) ##STR13## wherein R 2 and R 3 are a saturated or unsaturated hydrocarbon group having 4 to 20 carbon atoms; (5) an anhydride of said dicarboxylic acid of formula (III); (6) a lower alkyl ester of said dicarboxylic acid of formula (III); (7) an aromatic polycarboxylic acid represented by formula (IV): ##STR14## wherein n is an integer of 2 to 3; (8) a lower alkyl ester of said aromatic polycarboxylic acid of formula (IV); and (9) an anhydride of said aromatic polycarboxylic acid of formula (IV).
Claim 7
Dependent Claim
19 words
The color toner as claimed in claim 5, wherein said aromatic polycarboxylic acid of formula (IV) is trimellitic acid.
Claim 8
Dependent Claim
23 words
The color toner as claimed in claim 5, wherein said anhydride of said aromatic polycarboxylic acid of formula (IV) is trimellitic acid anhydride.
Claim 9
Dependent Claim
57 words
The color toner as claimed in claim 5, further comprising, as an additional acid component for said condensation polymerization, at least one additional acid component selected from the group consisting of an aromatic polycarboxylic acid represented by formula (V): ##STR15## an anhydride of said aromatic polycarboxylic acid; and a lower alkyl ester of said aromatic polycarboxylic acid.
Claim 10
Dependent Claim
220 words
The color toner as claimed in claim 4, wherein said polyester resin is a polyester resin obtained by condensation polymerization of: (a) a diol component of formula (I): ##STR16## wherein R 1 is an alkylene group having 2 to 4 carbon atoms; and x and y represent a positive integer, with the total sum of x and y having an average value of 2 to 16; and (b) at least one acid component selected from the group consisting of: (1) a dicarboxylic acid represented by formula (II) ##STR17## wherein R 2 is a saturated or unsaturated hydrocarbon group having 4 to 20 carbon atoms; (2) an anhydride of said dicarboxylic acid of formula (II); (3) a lower alkyl ester of said dicarboxylic acid of formula (II); (4) a dicarboxylic acid represented by formula (III) ##STR18## wherein R 2 and R 3 are a saturated or unsaturated hydrocarbon group having 4 to 20 carbons atoms; (5) an anhydride of said dicarboxylic acid of formula (III); (6) a lower alkyl ester of said dicarboxylic acid of formula (III); (7) an aromatic polycarboxylic acid represented by formula (IV): ##STR19## wherein n is an integer of 2 to 3; (8) a lower alkyl ester of said aromatic polycarboxylic acid of formula (IV); and (9) an anhydride of said aromatic polycarboxylic acid of formula (IV).
Claim 11
Dependent Claim
19 words
The color toner as claimed in claim 9, wherein said aromatic polycarboxylic acid of formula (IV) is trimellitic acid.
Claim 12
Dependent Claim
24 words
The color toner as claimed in claim 9, wherein said anhydride of said aromatic polycarboxylic acid represented by formula (IV) is trimellitic acid anhydride.
Claim 13
Dependent Claim
57 words
The color toner as claimed in claim 9, further comprising, as an additional acid component for said condensation polymerization, at least one additional acid component selected from the group consisting of an aromatic polycarboxylic acid represented by formula (V): ##STR20## an anhydride of said aromatic polycarboxylic acid; and a lower alkyl ester of said aromatic polycarboxylic acid.
Claim 14
Dependent Claim
19 words
The color toner as claimed in claim 1, wherein said wax ha a Mw/Mn ratio of 1.0 to 1.2.
Claim 15
Dependent Claim
25 words
The color toner as claimed in claim 1, wherein said wax is selected from the group consisting of an ester wax and an olefin wax.
Claim 16
Dependent Claim
25 words
The color toner as claimed in claim 13, wherein said wax is selected from the group consisting of an ester wax and an olefin wax.
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) | 2001-11-23 | 2002-05-25 | 2002-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-11-23 | 2006-05-25 | 2006-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-11-23 | 2010-05-25 | 2010-11-24 | $7700.00 | Window Closed / Lapsed |