US5047305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic-image developing polyester toner with release agent
Assignee: Konica Minolta Inc
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Filing: 1989-02-09
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Granted: 1991-09-10
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Expires: 2009-02-09
Abstract
Abstract An electrostatic-image developing toner containing a polyester prepared by condensation polymerization of a monomer composition consisting of: Component (1): a polyvalent monomer having not less than trivalency, Component (2): an aromatic dicarboxylic acid, and Component (3): an aliphatic dialcohol, and a releasing agent having some range of a penetration, is disclosed. The total of an acid value (AV) and a hydroxyl value (OHV) of said polyester comprises a value of not less than 30 and not more than 80.
Inventors
- 👤 Masafumi Uchida
- 👤 Jiro Takahashi
- 👤 Hiroyuki Takagiwa
- 👤 Akitoshi Matsubara
- 👤 Toshiko Yajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:18
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/20; G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08704; G03G9/08742; G03G9/08755; G03G9/097; G03G9/09733; G03G9/09783; G03G9/09791
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
85 words
An electrostatic image developing toner containing a polyester prepared by condensation polymerization of a monomer composition consisting essentially of: Component (1): an at least trivalent aromatic carboxylic acid, Component (2): an aromatic dicarboxylic acid, and Component (3): an aliphatic dialcohol, and a releasing agent having a range of penetration, wherein the total of an acid value (AV) and a hydroxyl value (OHV) of said polyester is not less than 30 and not more than 80, and the ratio of OHV/AV is not more than 5.0.
Claim 2
Dependent Claim
85 words
An electrostatic image developing toner containing a polyester prepared by condensation polymerization of a monomer composition consisting essentially of: Component (1): an at least trivalent aromatic carboxylic acid, Component (2): an aromatic dicarboxylic acid, and Component (3): an aliphatic dialcohol, and a releasing agent having a range of penetration, wherein the total of an acid value (AV) and a hydroxyl value (OHV) of said polyester is not less than 30 and not more than 80, and the ratio of OHV/AV is not more than 5.0.
Claim 3
Dependent Claim
17 words
The toner of claim 1 wherein the penetration of said releasing agent is not more than 4.
Claim 4
Dependent Claim
13 words
The toner of claim 1 wherein the ratio is not more than 2.0.
Claim 5
Dependent Claim
12 words
The toner of claim 3 wherein the ratio if less than 1.2.
Claim 6
Dependent Claim
19 words
The toner of claim 1 wherein said polyvalent aromatic carboxylic acid is benzenetricarboxylic acid, its anhydride, or its ester.
Claim 7
Dependent Claim
23 words
The toner of claim 1 wherein said Component (3) is a straight or branched chain aliphatic dialcohol having 2 to 10 carbon atoms.
Claim 8
Dependent Claim
25 words
The toner of claim 6 wherein the amount of said branched aliphatic dialcohol is not less than 50 mol % based on the total dialcohols.
Claim 9
Dependent Claim
18 words
The toner of claim 1 wherein the softening point (Tsp) of the polyester is 90 to 170° C.
Claim 10
Dependent Claim
12 words
The toner of claim 8 wherein Tsp is 100 to 160° C.
Claim 11
Dependent Claim
19 words
The toner of claim 1 wherein the glass transition point (Tg) of the polyester is 50 to 70° C.
Claim 12
Dependent Claim
18 words
The toner of claim 2 wherein the melting point of the releasing agent is 60 to 160° C.
Claim 13
Dependent Claim
21 words
The toner of claim 5 wherein the amount of Component (1) is 1 to 30 mol % of the monomer composition.
Claim 14
Dependent Claim
21 words
The toner of claim 12 wherein the amount of Component (1) is 1 to 15 mol % of the monomer composition.
Claim 15
Dependent Claim
27 words
The toner of claim 11 wherein the amount of the releasing agent is 1 to 20 parts by weight per 100 parts by weight of the polyester.
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) | 1994-09-09 | 1995-03-11 | 1995-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-09 | 1999-03-11 | 1999-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-09 | 2003-03-11 | 2003-09-10 | $7700.00 | Window Closed / Lapsed |