Patent US3523756A successfully refreshed from Google Patents.
US4067931A
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Flame retardant polyoxymethylene diphosphonates
Assignee: Uniroyal Chemical Co Inc
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Filing: 1976-05-19
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Granted: 1978-01-10
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Expires: 1996-05-19
Abstract
Abstract Polyoxymethylene diphosphonates having the formula <IMAGE> wherein the R groups are the same or different and are selected from alkyl, haloalkyl, hydroxyalkyl, or (R1 and R2) or (R3 and R4) are joined together to form a ring structure are disclosed. These compounds are useful as flame retardants for organic resins in general, and especially for foamed polyurethane resins.
Inventors
- 👤 Wadim Batorewicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:12
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0038; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4006; C07F9/4025; C08G; C08G2/00; C08G2/30; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5317; C08K5/5333; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
109 words
A polyoxymethylene diphosphonate of the formula ##STR9##wherein R 1 , R 2 , R 3 and R 4 are the same or different and are selected from the group consisting of alkyl having 1 to 6 carbon atoms, haloalkyl having 2 to 6 carbon atoms with the halogen being chlorine or bromine, hydroxyalkyl having 2 to 5 carbon atoms, R 1 and R 2 , and R 3 and R 4 are respectively joined together to form ring structures having 2 to 3 carbon atoms said ring structures being optionally substituted with up to two methyl or chloromethyl groups, and wherein n is an integer from 1 to 3.
Claim 2
Dependent Claim
109 words
A polyoxymethylene diphosphonate of the formula ##STR9##wherein R 1 , R 2 , R 3 and R 4 are the same or different and are selected from the group consisting of alkyl having 1 to 6 carbon atoms, haloalkyl having 2 to 6 carbon atoms with the halogen being chlorine or bromine, hydroxyalkyl having 2 to 5 carbon atoms, R 1 and R 2 , and R 3 and R 4 are respectively joined together to form ring structures having 2 to 3 carbon atoms said ring structures being optionally substituted with up to two methyl or chloromethyl groups, and wherein n is an integer from 1 to 3.
Claim 3
Dependent Claim
29 words
The diphosphonate of claim 1, wherein R 1 , R 2 , R 3 and R 4 are the same and are chloroalkyl having 2 to 6 carbon atoms.
Claim 4
Dependent Claim
21 words
The diphosphonate of claim 1 wherein R 1 , R 2 , R 3 and R 4 are each 1-chloro-2-propyl groups.
Claim 5
Dependent Claim
24 words
The diphosphonate of claim 1 wherein R 1 , R 2 , R 3 and R 4 are the same and are 2-chloroethyl groups.
Claim 6
Dependent Claim
42 words
The diphosphonate of claim 1 wherein both R 1 and R 2 and R 3 and R 4 respectively are joined together to form ring structures with 2 carbon atoms said ring structures being optionally substituted with up to two methyl groups.
Claim 7
Dependent Claim
99 words
A process for preparing polyoxymethylene phosphonates comprising reacting paraformaldehyde at a temperature of from 50° to 150° C. with a phosphite having the formula ##STR10##wherein R is selected from alkyl having 1 to 6 carbon atoms and haloalkyl having 2 to 6 carbon atoms with the halogen being chlorine or bromine, R 5 is alkylene having 2 to 3 carbon atoms optionally substituted with alkyl and haloalkyl groups having up to 3 carbon atoms with the halogen being chlorine or bromine, "a" has a value of 1 or 3, and "b" correspondingly has a value of 1 or 0.
Claim 8
Dependent Claim
99 words
A process for preparing polyoxymethylene phosphonates comprising reacting paraformaldehyde at a temperature of from 50° to 150° C. with a phosphite having the formula ##STR10##wherein R is selected from alkyl having 1 to 6 carbon atoms and haloalkyl having 2 to 6 carbon atoms with the halogen being chlorine or bromine, R 5 is alkylene having 2 to 3 carbon atoms optionally substituted with alkyl and haloalkyl groups having up to 3 carbon atoms with the halogen being chlorine or bromine, "a" has a value of 1 or 3, and "b" correspondingly has a value of 1 or 0.
Claim 9
Dependent Claim
17 words
The process of claim 6 wherein the R groups are alkyl having 3 to 6 carbon atoms.
Claim 10
Dependent Claim
15 words
The process of claim 6 wherein the reaction is carried out in a non-protic solvent.
Claim 11
Dependent Claim
11 words
The process of claim 8 wherein the solvent is diemthyl formamide.
Claim 12
Dependent Claim
39 words
The process of claim 6 wherein "a" is 3, "b" is O, R is haloalkyl having 2 to 6 carbon atoms with the halogen being chlorine or bromine, and the reaction occurs in the presence of a polar solvent.
Claim 13
Dependent Claim
11 words
The process of claim 10 wherein the solvent is dimethyl formamide.
Claim 14
Dependent Claim
15 words
The process of claim 6 wherein the temperature is from about 70° to 100° C.
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) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |