| US 7,498,396 B2 | ||
| Mid-range vinylidene content polyisobutylene polymer product produced by liquid phase polymerization process | ||
| C. Edward Baxter, Jr., League City, Tex. (US); Gilbert Valdez, Pearland, Tex. (US); Christopher Lobue, Montgomery, Tex. (US); Timothy Lowry, Spring, Tex. (US); and Armen Abazajian, Houston, Tex. (US) | ||
| Assigned to Texas Petrochemicals LP, Houston, Tex. (US) | ||
| Filed on Nov. 17, 2005, as Appl. No. 11/281,746. | ||
| Application 11/281746 is a continuation of application No. 10/968630, filed on Oct. 19, 2004, granted, now 7,056,990. | ||
| Application 10/968630 is a continuation of application No. 10/208234, filed on Jul. 30, 2002, granted, now 6,884,858. | ||
| Application 10/208234 is a continuation of application No. 10/102279, filed on Mar. 19, 2002, granted, now 7,037,999. | ||
| Application 10/208234 is a continuation of application No. 10/208234, filed on Jul. 30, 2002, granted, now 6,884,858. | ||
| Application 10/208234 is a continuation of application No. 09/665084, filed on Sep. 20, 2000, granted, now 6,525,149. | ||
| Application 09/665084 is a continuation in part of application No. 09/515790, filed on Feb. 29, 2000, granted, now 6,562,913. | ||
| Claims priority of provisional application 60/279305, filed on Mar. 28, 2001. | ||
| Claims priority of provisional application 60/160357, filed on Sep. 19, 1999. | ||
| Prior Publication US 2006/0079652 A1, Apr. 13, 2006 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. C08F 110/10 (2006.01); C08F 4/14 (2006.01); C07C 11/09 (2006.01) | ||
| U.S. Cl. 526—348.7 [526/64; 526/237; 585/18] | 4 Claims |
| 1. A mid-range vinylidene content PIB polymer composition comprising PIB molecules, wherein a first portion of said PIB molecules
have alpha position double bonds and a second portion of said PIB molecules have beta position double bonds, wherein said
first and second portions together include at least 90% of the PIB molecules of the composition, wherein no more than about
10% of the PIB molecules of the composition have tetra-substituted internal double bonds, wherein said first portion comprises
less than 70% of the PIB molecules of the composition, and wherein said composition has a polydispersity of no more than 2.0,
said PIB polymer composition characterized by having been prepared by a process comprising:
providing a liquid feedstock comprising isobutylene;
providing a catalyst composition comprising a stable complex of BF3 and a catalyst complexing agent, wherein the ratio of complexing agent to BF3 in said complex is no more than about 1.3:1;
introducing said feedstock and said catalyst composition into a residual reaction mixture in a loop reactor reaction zone;
recirculating the residual reaction mixture in said zone at a recirculation rate sufficient to cause intimate intermixing
of the residual reaction mixture, the feedstock and the catalyst composition to thereby present a recirculating, intimately
intermixed reaction admixture in said reaction zone;
maintaining the recirculating intimately intermixed reaction admixture in its intimately intermixed condition and removing
heat of reaction from the reaction admixture at a rate calculated to provide a substantially constant reaction temperature
in the reaction admixture while the same is recirculating in said reaction zone;
withdrawing a product stream comprising said mid-range vinylidene content PIB polymer composition; and
controlling the introduction of said feedstock into said reaction zone and the withdrawal of said product stream from the
reaction zone such that the residence time of the isobutylene components undergoing polymerization in the reaction zone is
no more than about 4 minutes.
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