US4454064A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing pentaerythritol phosphate
Assignee: Borg Warner Corp
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Filing: 1982-10-29
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Granted: 1984-06-12
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Expires: 2002-10-29
Abstract
Abstract A process involving the reaction of pentaerythritol with phosphorus oxychloride. A solvent is used in the process, but not catalyst or amine (as a hydrogen chloride acceptor) is required.
Inventors
- 👤 Yuval Halpern
- 👤 Ron H. Niswander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:50
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6571; C07F9/6574; C07F9/65748
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
46 words
A process for the preparation of pentaerythritol phosphate comprising mixing approximately equimolar amounts of pentaerythritol and phosphorous oxychloride, in dioxane as a solvent, heating the mixture at a temperature within the range of from about 75° C. to about 125° C., and isolating said pentaerythritol phosphate.
Claim 2
Dependent Claim
46 words
A process for the preparation of pentaerythritol phosphate comprising mixing approximately equimolar amounts of pentaerythritol and phosphorous oxychloride, in dioxane as a solvent, heating the mixture at a temperature within the range of from about 75° C. to about 125° C., and isolating said pentaerythritol phosphate.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the phosphorous oxychloride is added portionwise to the pentaerythritol at the reaction temperature.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein the pentaerythritol phosphate is isolated by filtration.
Claim 5
Dependent Claim
21 words
The process of claim 3 wherein the filtrate from the isolation step of a prior process is used as the solvent.
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) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |