US4446302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatographic developers comprising toners containing a polyester having p-hydroxybenzoic acid recurring units
Assignee: Eastman Kodak Co
•
Filing: 1983-07-25
•
Granted: 1984-05-01
•
Expires: 2003-07-25
Abstract
Abstract Polyesters having recurring units derived from diols and diacids and recurring units derived from p-hydroxybenzoic acid is disclosed. Electrographic developer compositions comprising toner particles containing the polyesters are also disclosed.
Inventors
- 👤 M. Akram Sandhu
- 👤 John F. Wright
- 👤 Michel F. Molaire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:32
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; C; C08; C08G; C08G63/00; C08G63/02; C08G63/60
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
37 words
A polyester having recurring units derived from diols and diacids and recurring units derived from p-hydroxybenzoic acid characterized in that from about 15-60 mole percent of the recurring units of said polyesters are derived from p-hydroxybenzoic acid.
Claim 2
Dependent Claim
37 words
A polyester having recurring units derived from diols and diacids and recurring units derived from p-hydroxybenzoic acid characterized in that from about 15-60 mole percent of the recurring units of said polyesters are derived from p-hydroxybenzoic acid.
Claim 3
Dependent Claim
67 words
A polyester having the following structure: ##STR2## wherein x is about 0 to 100 mole percent of the prepolymer diol component; y is about 0 to 100 mole percent of the prepolymer diol component; m is about 20 to 100 mole percent of the prepolymer diacid component; and n is about 15 to 60 mole percent of the recurring prepolymer and p-hydroxybenzoic acid units of the polyester.
Claim 4
Dependent Claim
67 words
A polyester having the following structure: ##STR2## wherein x is about 0 to 100 mole percent of the prepolymer diol component; y is about 0 to 100 mole percent of the prepolymer diol component; m is about 20 to 100 mole percent of the prepolymer diacid component; and n is about 15 to 60 mole percent of the recurring prepolymer and p-hydroxybenzoic acid units of the polyester.
Claim 5
Dependent Claim
23 words
The polyester of claim 2 wherein m is about 30 to 75 mole percent and n is about 25 to 50 mole percent.
Claim 6
Dependent Claim
20 words
The polyester composition of claims 1 or 9 wherein said polyester has a Tg of about 50° to 80° C.
Claim 7
Dependent Claim
19 words
The polyester in claims 1 or 2 wherein said polyester has an inherent viscosity of about 0.3 to 0.7.
Claim 8
Dependent Claim
29 words
A polyester selected from the group consisting of poly[poly(ethylene 1,4-cyclohexanedicarboxylate:terephthalate 23:77):1,4-oxybenzoate 75:25]; poly[poly(2,2-dimethyl-1,3-propylene:2,2'-oxydiethylene 80:20 terephthalate):1,4-oxybenzoate 75:25]; poly[poly(2,2-dimethyl-1,3-propylene:2,2'-oxydiethylene 75:25 terephthalate):1,4-oxybenzoate 75:25]; poly[poly(ethylene 1,4-cyclohexanedicarboxylate:terephthalate 29:71):1,4-oxybenzoate 75:25]; and poly[poly(2,2-dimethyl-1,3-propylene:2,2'-oxydiethylene 85:15 terephthalate):1,4-oxybenzoate 75:25].
Claim 9
Dependent Claim
29 words
A polyester selected from the group consisting of poly[poly(ethylene 1,4-cyclohexanedicarboxylate:terephthalate 23:77):1,4-oxybenzoate 75:25]; poly[poly(2,2-dimethyl-1,3-propylene:2,2'-oxydiethylene 80:20 terephthalate):1,4-oxybenzoate 75:25]; poly[poly(2,2-dimethyl-1,3-propylene:2,2'-oxydiethylene 75:25 terephthalate):1,4-oxybenzoate 75:25]; poly[poly(ethylene 1,4-cyclohexanedicarboxylate:terephthalate 29:71):1,4-oxybenzoate 75:25]; and poly[poly(2,2-dimethyl-1,3-propylene:2,2'-oxydiethylene 85:15 terephthalate):1,4-oxybenzoate 75:25].
Claim 10
Independent Claim
139 words
A method of preparing a polyester having recurring units derived from diols and diacids and recurring units derived from p-hydroxybenzoic acid characterized in that from about 15-60 mole percent of the recurring units of said polyesters are derived from p-hydroxybenzoic acid comprising the steps: (a) forming a prepolymer by (i) heating up to three diols and up to two diacid esters in the presence of a catalyst in an inert atmosphere at about 190°-280° C.; (ii) applying vacuum at the temperature range of 260°-280° C.; (iii) continuing to heat under vacuum thereby building up the molecular weight of the prepolymer; and (iv) cooling and isolating the prepolymer (b) reacting the prepolymer with p-hydroxybenzoic acid in the presence of the catalyst used in step (ai) and (c) continuing the reaction until a inherent viscosity of at least 0.3 is reached.
Claim 11
Independent Claim
139 words
A method of preparing a polyester having recurring units derived from diols and diacids and recurring units derived from p-hydroxybenzoic acid characterized in that from about 15-60 mole percent of the recurring units of said polyesters are derived from p-hydroxybenzoic acid comprising the steps: (a) forming a prepolymer by (i) heating up to three diols and up to two diacid esters in the presence of a catalyst in an inert atmosphere at about 190°-280° C.; (ii) applying vacuum at the temperature range of 260°-280° C.; (iii) continuing to heat under vacuum thereby building up the molecular weight of the prepolymer; and (iv) cooling and isolating the prepolymer (b) reacting the prepolymer with p-hydroxybenzoic acid in the presence of the catalyst used in step (ai) and (c) continuing the reaction until a inherent viscosity of at least 0.3 is reached.
Claim 12
Dependent Claim
101 words
The method of claim 7, wherein the polyester has the structure ##STR3## wherein x is about 0 to 100 mole percent of the prepolymer diol component; y is about 0 to 100 mole percent of the prepolymer diol component; m is about 20 to 100 mole percent of the prepolymer diacid component; and n is about 15 to 60 mole percent of the recurring prepolymer and p-hydroxybenzoic acid units of the polyester. and the diols are selected from the group consisting ethylene glycol, 2,2'-oxydiethanol and 2,2-dimethyl-1,3-propanediol and the acids are selected from the group consisting of the esters of terephthalic acid.
References Cited (Backward Citations)
NL7414076A
Cited
US4075173A
Cited
US4140644A
Cited
US4267304A
Cited
US4271249A
Cited
US4252921A
Cited
JPS5665146A
Cited
US4310655A
Cited
GB2091897A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |