Patent US4275189A successfully refreshed from Google Patents.
US4275189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Neopentyl glycol, terephthalate, dicarboxy acid, trimellitate thermosetting resin
Assignee: Cargill Inc
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Filing: 1980-02-28
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Granted: 1981-06-23
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Expires: 2000-02-28
Abstract
Abstract The invention is directed to a polyester resin, and a method for making it, for use in a powder coating. The resin comprises on oligomer of neopentyl glycol or cyclohexane dimethanol and terephthalic acid, isophthalic acid or dimethyl terephthalate in a mole ratio between about 1.15 and about 1.50, the oligomer being reacted with trimellitic anhydride to provide a trimellitate with the mole ratio oligomer to trimellitate being in the range of between about 2.5 and 5.5. The trimellitate is reacted with a dicarboxylic anhydride or acid with the mole ratio of trimellitate to dicarboxylic anhydride or acid between about 1.5 and about 2.5. The polyester resin has an ICI viscosity at 200° C. between about 20 poises and about 60 poises, an acid value of less than 30, a hydroxyl value between about 20 and about 60, and an equivalent weight between about 935 and about 2800.
Inventors
- 👤 Charles Danick
- 👤 K. A. Pai Panandiker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:34
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/20; C09; C09D; C09D167/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
129 words
A polyester resin for a powder coating resin comprising an oligomer of neopentyl glycol or cyclohexane dimethanol and terephthalic acid, or isophthalic acid or dimethyl terephthalate in a mole ratio of between about 1.15 and about 1.50 reacted with trimellitic anhydride to provide a trimellitate, the mole ratio of the oligomer to the trimellitic anhydride being in the range from about 2.5 to about 5.5, the trimellitate being reacted with a dicarboxylic anhydride or acid in the mole ratio of between about 1.5 and 2.5; the polyester resin having an ICI viscosity at 200° C. between about 20 poises and about 60 poises, an acid value of less than 30, a hydroxyl value between about 20 and about 60, and an equivalent weight between about 935 and about 2800.
Claim 2
Dependent Claim
129 words
A polyester resin for a powder coating resin comprising an oligomer of neopentyl glycol or cyclohexane dimethanol and terephthalic acid, or isophthalic acid or dimethyl terephthalate in a mole ratio of between about 1.15 and about 1.50 reacted with trimellitic anhydride to provide a trimellitate, the mole ratio of the oligomer to the trimellitic anhydride being in the range from about 2.5 to about 5.5, the trimellitate being reacted with a dicarboxylic anhydride or acid in the mole ratio of between about 1.5 and 2.5; the polyester resin having an ICI viscosity at 200° C. between about 20 poises and about 60 poises, an acid value of less than 30, a hydroxyl value between about 20 and about 60, and an equivalent weight between about 935 and about 2800.
Claim 3
Dependent Claim
14 words
The product of claim 1 wherein the dicarboxylic acid or anhydride is succinic anhydride.
Claim 4
Dependent Claim
25 words
The product of claim 2 wherein the ICI viscosity is between about 20 poises and 45 poises and the acid value is less than 15.
Claim 5
Independent Claim
103 words
A method for making a polyester resin comprising the steps of reacting neopentyl glycol or cycloxexane dimethanol with terephthalic acid, or isophthalic acid or dimethyl terephthalate in a mole ratio of between about 1.15 and about 1.50 to form an oligomer; reacting the oligomer with trimellitic anhydride in a mole ratio of between about 2.5 and about 5.5 to form a terephthalate trimellitate or isophthalate trimellitate; and then reacting the terephthalate trimellitate or isophthalate trimellitate with a dicarboxylic anhydride or acid in a mole ratio of between about 1.5 and 2.5, and terminating the reaction when the ICI viscosity at 200° C. stalls.
Claim 6
Independent Claim
103 words
A method for making a polyester resin comprising the steps of reacting neopentyl glycol or cycloxexane dimethanol with terephthalic acid, or isophthalic acid or dimethyl terephthalate in a mole ratio of between about 1.15 and about 1.50 to form an oligomer; reacting the oligomer with trimellitic anhydride in a mole ratio of between about 2.5 and about 5.5 to form a terephthalate trimellitate or isophthalate trimellitate; and then reacting the terephthalate trimellitate or isophthalate trimellitate with a dicarboxylic anhydride or acid in a mole ratio of between about 1.5 and 2.5, and terminating the reaction when the ICI viscosity at 200° C. stalls.
Claim 7
Dependent Claim
14 words
The method of claim 4 wherein the dicarboxylic anhydride or acid is succinic anhydride.
References Cited (Backward Citations)
US4024111A
Cited
US4124570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-22 | 1984-12-22 | 1985-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-22 | 1988-12-22 | 1989-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-22 | 1992-12-22 | 1993-06-23 | $7700.00 | Window Closed / Lapsed |