US3966849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bromine-containing cyclic phosphonic acid esters
Assignee: Hoechst AG
•
Filing: 1974-08-05
•
Granted: 1976-06-29
•
Expires: 1994-08-05
Abstract
Abstract Bromine-containing phosphonic acid esters of the formula ##EQU1## in which R represents a halogen-containing linear or branched aliphatic or cycloaliphatic hydrocarbon radical having from 1 to 8 carbon atoms and R' and R" are hydrogen, halogen or alkyl groups having from 1 to 4 carbon atoms which may be closed to form a ring and/or substituted by halogen, at least one substituent being a bromine atom, are suitable as flame retardants for plastic materials, especially polystyrene and styrene copolymers.
Inventors
- 👤 Siegfried Noetzel
- 👤 Horst Jastrow
- 👤 Edgar Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:45
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5317; C08K5/5333; C08K5/5357; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6571; C07F9/657163; C07F9/657181
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
33 words
A phosphonic acid ester of the formula ##EQU5## in which R' and R" represent a member selected from the group consisting of hydrogen, chlorine, bromine and R' and R" joined to form dibromo-cyclohexane.
Claim 2
Dependent Claim
33 words
A phosphonic acid ester of the formula ##EQU5## in which R' and R" represent a member selected from the group consisting of hydrogen, chlorine, bromine and R' and R" joined to form dibromo-cyclohexane.
Claim 3
Dependent Claim
13 words
The phosphonic acid ester of claim 1 wherein R' and R" are bromine.
Claim 4
Dependent Claim
13 words
The phosphonic acid ester of claim 1 wherein R' and R" are chlorine.
Claim 5
Dependent Claim
13 words
The phosphonic acid ester of claim 1 wherein R' and R" are hydrogen.
Claim 6
Dependent Claim
16 words
The phosphonic acid ester of claim 1 wherein R' and R" are joined and form 3,4-dibromo-cyclohexane.
References Cited (Backward Citations)
US3033887A
Cited
US3511857A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |