US3981936A
Expired / Lapsed
US
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Method for the preparation of bis-(bromomethyl)-tetrachlorobenzenes and their use as flame-proofing agents
Assignee: Dynamit Nobel AG
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Filing: 1974-03-27
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Granted: 1976-09-21
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Expires: 1994-03-27
Abstract
Abstract A process for preparing a bis-(bromomethyl)-tetrachlorobenzene which comprises contacting a bis-(chloromethyl)-tetrachlorobenzene with a bromide of an element of the first to the third group of the Periodic Table, preferably in a solvent of the bis-(chloromethyl)-tetrachlorobenzene which solvent is a non-solvent for the bis-(bromomethyl)-tetrachlorobenzene being prepared; a stabilized polymeric composition comprising a polymer and a bis-(bromomethyl)-tetrachlorobenzene, preferably containing additionally a compound of antimony or boron.
Inventors
- 👤 Egon Petersen
- 👤 Werner Schmidt
- 👤 Klaus-Dieter Steffen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:49
CPC Classifications
C; C08; C08K; C08K13/00; C08K13/02; C07; C07C; C07C17/00; C07C17/093; C07C17/20; C07C17/202; C07C17/208; C08K5/00; C08K5/02; C08K5/03
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
66 words
A process for preparing a bis-(bromomethyl)-tetrachlorobenzene which comprises contacting a bis-(chloromethyl)-tetrachlorobenzene at a temperature between 20° and 180°C with a bromide of an element of group 1 to group 3 inclusive of the periodic system or hydrogen bromide in a solvent for said bis-(chloromethyl)-tetrachlorobenzene in which solvent the corresponding bis-(bromomethyl)-tetrachlorobenzene is substantially insoluble, said solvent being selected from the group consisting of alcohols, ethers and ketones.
Claim 2
Dependent Claim
66 words
A process for preparing a bis-(bromomethyl)-tetrachlorobenzene which comprises contacting a bis-(chloromethyl)-tetrachlorobenzene at a temperature between 20° and 180°C with a bromide of an element of group 1 to group 3 inclusive of the periodic system or hydrogen bromide in a solvent for said bis-(chloromethyl)-tetrachlorobenzene in which solvent the corresponding bis-(bromomethyl)-tetrachlorobenzene is substantially insoluble, said solvent being selected from the group consisting of alcohols, ethers and ketones.
Claim 3
Dependent Claim
25 words
A process according to claim 1 wherein the bromide is introduced into a reaction vessel containing bis-(chloromethyl)-tetrachlorobenzene in solution in the form of a solution.
Claim 4
Dependent Claim
24 words
A process according to claim 1 wherein the solvent is selected from the group consisting of acetone or methanol in the presence of water.
Claim 5
Dependent Claim
29 words
A process according to claim 3 wherein the bromide is selected from the group consisting of hydrogen bromide, sodium bromide, potassium bromide, lithium bromide, magnesium bromide and aluminum bromide.
Claim 6
Dependent Claim
12 words
A process according to claim 4 wherein the bromide is sodium bromide.
Claim 7
Dependent Claim
19 words
A process according to claim 1 wherein the reaction is carried out at a temperature between 40° and 150°C.
Claim 8
Dependent Claim
22 words
A process according to claim 1 wherein the reaction is carried out with stirring for a period of 1 to 5 hours.
Claim 9
Dependent Claim
23 words
A process according to claim 7 wherein the reaction is carried out with stirring for a period of between 3 and 4 hours.
Claim 10
Dependent Claim
11 words
A process according to claim 1 wherein the bis-(chloromethyl)-tetrachlorobenzene is 1,2-bis-(chloromethyl)-tetrachlorobenzene.
Claim 11
Dependent Claim
11 words
A process according to claim 1 wherein the bis-(chloromethyl)-tetrachlorobenzene is 1,3-bis-(chloromethyl)-tetrachlorobenzene.
Claim 12
Dependent Claim
11 words
A process according to claim 1 wherein the bis-(chloromethyl)-tetrachlorobenzene is 1,4-bis-(chloromethyl)-tetrachlorobenzene.
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) | 1979-09-21 | 1980-03-22 | 1980-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-21 | 1984-03-22 | 1984-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-21 | 1988-03-22 | 1988-09-21 | $7700.00 | Window Closed / Lapsed |