Patent US3873451A successfully refreshed from Google Patents.
US3873451A
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Flame retardant antimony compounds
Assignee: EIDP Inc
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Filing: 1973-03-07
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Granted: 1975-03-25
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Expires: 1993-03-07
Abstract
Abstract Esters of pentavalent antimony with aliphatic polyhydroxy compounds having vicinal hydroxyl groups, salts of the esters with zinc and stannous oxides and hydroxides, and mixed esters of trivalent and pentavalent antimony with aliphatic polyhydroxy compounds having vicinal hydroxyl groups, are effective flame retardants for organic polymers such as polyacrylonitrile. The esters and salts are soluble in solvents commonly used for processing the polymers, and hence can be conveniently incorporated into the polymers.
Inventors
- 👤 Charles Carmen Cumbo
- 👤 Paul C Yates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:03
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/59; C07; C07F; C07F9/00; C07F9/90; C07F9/902; Y; Y10; Y10S; Y10S428/00; Y10S428/92
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
29 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF A. SALTS OF ZINC OXIDE AND HYDROXIDE AND STANNOUS OXIDE AND HYDROXIDE WITH ESTER OF PENTAVALENT ANTIMONY HAVING THE STRUCTURAL FORMULA:
Claim 2
Dependent Claim
29 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF A. SALTS OF ZINC OXIDE AND HYDROXIDE AND STANNOUS OXIDE AND HYDROXIDE WITH ESTER OF PENTAVALENT ANTIMONY HAVING THE STRUCTURAL FORMULA:
Claim 3
Dependent Claim
13 words
A mixed ester composed of esters of pentavalent antimony having the structural formula:
Claim 4
Dependent Claim
13 words
A mixed ester composed of esters of pentavalent antimony having the structural formula:
Claim 5
Dependent Claim
41 words
A solution of a mixed ester or mixture of mixed esters of claim 2 in a polar organic solvent, the mole ratio of antimony to the aliphatic polyhydroxy component of the mixed esters being in the range of 1:1 to 1:2.
Claim 6
Dependent Claim
69 words
A solution of a mixed ester or mixture of mixed esters of claim 2 in a polar organic solvent having a dielectric constant measured at 25*C. and 104 to 105 cps. greater than 35 ESU and a ratio of carbon atoms to hetero atoms less than 1.7, the mole ratio of antimony to the aliphatic polyhydroxy component of the mixed esters being in the range of 1:1 to 1:2.
Claim 7
Dependent Claim
34 words
A solution of claim 4 in which the solvent is at least one member of the group consisting of formic acid, formamide, methylformamide, dimethylformamide, acetamide, ethylene glycol, glycerol, diethylene glycol, 1,3-propanediol, 1,2-propanediol, and dimethylsulfoxide.
Claim 8
Dependent Claim
14 words
A solution of claim 4 wherein the solvent is selected from dimethylformamide and dimethylsulfoxide.
Claim 9
Independent Claim
38 words
A method of making mixed esters of pentavalent antimony and trivalent antimony with aliphatic polyhydroxy compounds containing 2 through 6 carbon atoms and having vicinal hydroxyl groups, which comprises mixing a pentavalent antimony ester having the structural formula:
Claim 10
Independent Claim
38 words
A method of making mixed esters of pentavalent antimony and trivalent antimony with aliphatic polyhydroxy compounds containing 2 through 6 carbon atoms and having vicinal hydroxyl groups, which comprises mixing a pentavalent antimony ester having the structural formula:
Claim 11
Dependent Claim
11 words
Method of claim 7 wherein the polyhydroxy compound is ethylene glycol.
Claim 12
Dependent Claim
10 words
Method of claim 7 wherein the polyhydroxy compound is glycerol.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |