US4119614A
Expired / Lapsed
US
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Process for making polyester polymer
Assignee: Monsanto Co
•
Filing: 1977-12-22
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Granted: 1978-10-10
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Expires: 1997-12-22
Abstract
Abstract The method of making a polyester polymer by polycondensing a glycol phthalate prepolymer in the presence of a germanium dioxide/tetraalkyl ammonium hydroxide catalyst.
Inventors
- 👤 Henry L. King
- 👤 Chester C. Wu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:42
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/85; C08G63/86; C08G63/87
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
32 words
A process for preparation of polyester polymers, comprising polycondensing a glycol phthalate prepolymer in the presence of an effective amount of the reaction product of germanium dioxide and a tetraalkyl ammonium hydroxide.
Claim 2
Dependent Claim
32 words
A process for preparation of polyester polymers, comprising polycondensing a glycol phthalate prepolymer in the presence of an effective amount of the reaction product of germanium dioxide and a tetraalkyl ammonium hydroxide.
Claim 3
Dependent Claim
24 words
The process of claim 1 wherein the tetraalkyl ammonium hydroxide is selected from the group consisting of tetramethyl ammonium hydroxide and tetraethyl ammonium hydroxide.
Claim 4
Dependent Claim
21 words
The process of claim 2 wherein the glycol phthalate is selected from the group consisting of ethylene isophthalate and ethylene terephthalate.
Claim 5
Dependent Claim
38 words
The process of claim 3 wherein the glycol phthalate is polycondensed in the presence of ethylene glycol containing an amount of reaction product such that the glycol contains an equivalent of 1 to 25 weight percent germanium dioxide.
Claim 6
Dependent Claim
17 words
The process of claim 4 wherein the glycol contains an equivalent of 5-15 weight percent germanium dioxide.
Claim 7
Dependent Claim
32 words
The process of claim 3 wherein the amount of said catalyst is such that there is present 0.008 to 0.04 weight percent germanium dioxide, based on the weight of the glycol phthalate.
Claim 8
Dependent Claim
12 words
The process of claim 6 wherein the glycol phthalate is ethylene terephthalate.
Claim 9
Dependent Claim
14 words
The process of claim 7 wherein the tetraaklyl ammonium hydroxide is tetramethyl ammonium hydroxide.
Claim 10
Dependent Claim
14 words
The process of claim 7 wherein the tetraalkyl ammonium hydroxide is tetraethyl ammonium hydroxide.
References Cited (Backward Citations)
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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) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |