Claims
- 1. A process for the production of brominated polystyrene by the bromination of polystyrene, the process comprising:
contacting the polystyrene prior to its bromination with a solution containing an additive that suppresses halogenation of the polystrene backbone during the bromination.
- 2. The process of claim 1 wherein the solution solvent is a halogenated hydrocarbon.
- 3. The process of claim 1 wherein the solvent is selected from the group consisting of carbon tetrachloride, chloroform, methylene chloride, 1,2-dichloroethane, 1,1,2- trichloroethane, 1,1,2,2-tetrachloroethane, 1,2-dibromoethane and mixtures of two or more of the foregoing.
- 4. The process of claim 1 wherein the bromination is effected with bromine or bromine chloride.
- 5. The process of claim 1 wherein the bromination is effected with bromine chloride and is catalyzed with antimony trichloride, antimony tribromide or mixtures thereof.
- 6. The process of claim 1 wherein the additive comprises titanium tetrachloride, tin tetrachloride or boron trichloride.
- 7. The process of claim 6 wherein the solvent is selected from the group consisting of carbon tetrachloride, chloroform, methylene chloride, 1,2-dichloroethane, 1,1,2- trichloroethane, 1,1,2,2-tetrachloroethane, 1,2-dibromoethane and mixtures of two or more of the foregoing.
- 8. The process of claim 7 wherein the bromination is effected with bromine or bromine chloride.
- 9. The process of claim 1 wherein the bromination is effected with bromine chloride.
- 10. The process of claim 7 wherein the bromination is effected with bromine chloride.
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a Continuation of U.S. Ser. No. 09/076,944, filed May 13, 1998, presently pending, which is a Continuation-in-Part of U.S. Ser. No. 08/796,277, filed Feb. 7, 1997, U.S. Pat. No. 5,726,252, which is a Division of U.S. Ser. No. 08/661,350, filed Jun. 14, 1996, U.S. Pat. No. 5,637,650.
Divisions (1)
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Number |
Date |
Country |
Parent |
08661350 |
Jun 1996 |
US |
Child |
08796277 |
Feb 1997 |
US |
Continuations (1)
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Number |
Date |
Country |
Parent |
09076944 |
May 1998 |
US |
Child |
09971971 |
Oct 2001 |
US |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
08796277 |
Feb 1997 |
US |
Child |
09076944 |
May 1998 |
US |