Claims
- 1. A process for grafting a lithium terminated vinyl aromatic polymer onto a halobutyl rubber which comprises: (1) capping the lithium terminated vinyl aromatic polymer with a diene monomer to produce a lithium terminated diene capped vinyl aromatic polymer, and (2) reacting the lithium terminated diene capped vinyl aromatic polymer with the halobutyl rubber to produce a halobutyl rubber having vinyl aromatic sidechains grafted thereto.
- 2. A process for preparing a thermoplastic elastomer having a halobutyl rubber backbone and vinyl aromatic polymer sidechains, said process being comprised of reacting a halobutyl rubber with at least one lithium terminated diene capped vinyl aromatic polymer.
- 3. A process as specified in claim 1 wherein the halobutyl rubber is selected from the group consisting of bromobutyl rubbers and chlorobutyl rubbers.
- 4. A process as specified in claim 3 wherein the vinyl aromatic polymer is selected from the group consisting of polystyrene, polyvinyltoluene and poly-.alpha.-methylstyrene.
- 5. A process as specified in claim 4 wherein the halobutyl rubber has a number average molecular weight which is within the range of about 100,000 to about 500,000.
- 6. A process as specified in claim 5 wherein the halobutyl rubber contains from about 0.75 weight percent to about 3 weight percent of the halogen.
- 7. A process as specified in claim 6 wherein the vinyl aromatic polymer is polystyrene.
- 8. A process as specified in claim 7 wherein the vinyl aromatic polymer is capped with 1,3-butadiene or isoprene.
- 9. A process as specified in claim 8 wherein the vinyl aromatic polymer has a number average molecular weight which is within the range of about 1,000 to about 100,000.
- 10. A process as specified in claim 9 wherein the halobutyl rubber has a number average molecular weight which is within the range of about 300,000 to about 350,000.
- 11. A process as specified in claim 10 wherein the vinyl aromatic polymer has a number average molecular weight which is within the range of about 3,000 to about 40,000.
- 12. A process as specified in claim 11 wherein the halobutyl rubber contains from about 1 weight percent to about 2 weight percent of the halogen.
- 13. A process as specified in claim 12 wherein the halobutyl rubber is a chlorobutyl rubber.
- 14. A process as specified in claim 12 wherein the halobutyl rubber is bromobutyl rubber.
Parent Case Info
This is a divisional application of Ser. No. 07/749,787, filed on Aug. 26, 1991 (now issued as U.S. Pat. No. 5,221,716), which is a divisional application of Ser. No. 07,498,676, filed on Mar. 26, 1990 (now abandoned).
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Divisions (2)
|
Number |
Date |
Country |
Parent |
749787 |
Aug 1991 |
|
Parent |
498676 |
Mar 1990 |
|