US3789091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclic phosphonate esters and their preparation
Assignee: Albright and Wilson Inc
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Filing: 1971-11-15
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Granted: 1974-01-29
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Expires: 1991-11-15
Abstract
Abstract Polymers containing flame retardant amounts of addition products of alkylhalogen-free esters of (1a) phosphorus acids, (1b) carboxylic acids, or (1c) sulfonic acids and (2) a bicyclic phosphite (1-alkyl-4-phospha-3,5,8-trioxabicyclo-(2,2,2)-octane), said addition products having the following group; WHERE R is lower alkyl C1-C4), preferably C1-C2, an hydroxyalkyl (C1-C4), preferably C2-C3; the addition products of (1a) or (1b) and (2); and preparation of the addition products by heating a mixture of (1a) or (1b) and (2) to an elevated temperature (e.g., 175*-300*C.).
Inventors
- 👤 J Anderson
- 👤 V Camacho
- 👤 R Kinney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:05
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0038; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6571; C07F9/657163; C07F9/657181; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5317; C08K5/5333; C08K5/5357; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
8 words
A compound of claim 1 having the formula:
Claim 2
Dependent Claim
8 words
A compound of claim 1 having the formula:
Claim 3
Dependent Claim
8 words
A compound of claim 1 having the formula:
Claim 4
Dependent Claim
8 words
A compound of claim 1 having the formula:
Claim 5
Dependent Claim
8 words
A compound of claim 1 having the formula:
Claim 6
Dependent Claim
8 words
A compound of claim 1 having the formula:
Claim 7
Dependent Claim
18 words
A process for preparing addition products that comprises reacting a compound A: a phosphonate ester having the formula:
Claim 8
Dependent Claim
10 words
The process of claim 8 wherein compound B is 1-ethyl-4-phospha-3,5,8-trioxabicyclo-(2,2,2)-octane.
Claim 9
Dependent Claim
11 words
The process of claim 9 wherein compound A is dimethyl methylphosphonate.
Claim 10
Dependent Claim
11 words
The process of claim 9 wherein compound A is trimethyl phosphate.
Claim 11
Dependent Claim
11 words
The process of claim 9 wherein compound A is dimethyl terephthalate.
Claim 12
Dependent Claim
11 words
The process of claim 9 wherein compound A is dimethyl o-phthalate.
Claim 13
Dependent Claim
12 words
The process of claim 9 wherein compound A is diphenyl methyl phosphate.
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |