Para-alkylstyrene/isoolefin copolymers having substantially homogeneous compositional distribution

• US 5,430,118 A
• Filed: 01/14/1994
• Issued: 07/04/1995
• Est. Priority Date: 05/27/1988
• Status: Expired due to Term

• Current Assignee: Exxon Chemical Patents Inc. (Exxon Mobil Corporation)
• Original Assignee: Exxon Chemical Patents Inc. (Exxon Mobil Corporation)
• Inventors: Wang, Hsien-Chang, Powers, Kenneth W.
• Primary Examiner(s): TESKIN, FRED M
• Application Number:
  US08/181,713
• Time in Patent Office: 536 Days
• Field of Search: 526/347, 526/237, 526/912, 526/348.7
• US Class Current: 526/347
• CPC Class Codes: C08F 210/08 Butenes
• CPC Class Codes: C08F 210/10 Isobutene
• CPC Class Codes: C08F 210/14 Monomers containing five or more carbon atoms
• CPC Class Codes: C08F 212/04 containing one ring
• CPC Class Codes: C08F 212/12 Monomers containing a branched unsaturated aliphatic radical or a ring substituted by an alkyl radical
• CPC Class Codes: C08F 212/21 Bromine
• CPC Class Codes: C08F 2500/03 Narrow molecular weight distribution, i.e. Mw/Mn < 3
• CPC Class Codes: C08F 8/00 Chemical modification by after-treatment graft polymers, block polymers, crosslinking with unsaturated monomers or with polymers C08F251/00 - C08F299/00; of conjugated diene rubbers C08C
• CPC Class Codes: C08F 8/20 Halogenation
• CPC Class Codes: C08G 81/021 Block or graft polymers containing only sequences of polymers of C08C or C08F
• CPC Class Codes: C08L 23/02 not modified by chemical after-treatment
• CPC Class Codes: C08L 23/22 Copolymers of isobutene; Butyl rubber ; Homo- or copolymers of other iso-olefins
• CPC Class Codes: C08L 23/283 Halogenated homo- or copolymers of iso-olefins
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 2666/24 Graft or block copolymers according to groups C08L51/00, C08L53/00 or C08L55/02; Derivatives thereof
• CPC Class Codes: C08L 71/123 not modified by chemical after-treatment
• CPC Class Codes: Y02P 20/582 Recycling of unreacted starting or intermediate materials
• CPC Class Codes: Y10S 526/912 Reaction medium purification

Abstract

A copolymer having a substantially homogeneous composition distribution, said copolymer comprising the direct reaction product of an isoolefin and para-alkylstrene.

Claims

1. A copolymer comprising the direction reaction product of isoolefin having from 4 to 7 carbon atoms and para-alkylstyrene, said copolymer having a substantially homogeneous compositional distribution.

2. The copolymer of claim 1 wherein said copolymer has a number average molecular weight of at least about 25,000.

3. The copolymer of claim 1 wherein said copolymer has a number average molecular weight of between about 500 and 25,000.

4. The copolymer of claim 1 wherein said copolymer has a ratio of M_w /MM_n of less than about 6.

5. The copolymer of claim 1 wherein said copolymer has a ratio of M_w /MM_n of less than about 2.5

6. The copolymer of claim 1 wherein said copolymer has a ratio of M_w /M_n of less than about 2.

7. The copolymer of claim 1 wherein said isoolefin comprises isobutylene and said para-alkylstyrene comprises para-methylstyrene.

8. The copolymer of claim 7 wherein said copolymer has a number average molecular weight of greater than about 25.000.

9. The copolymer of claim 8 wherein said copolymer has a ratio of M_w /M_n of less than about 6.

10. The copolymer of claim 9 wherein said copolymer has a ratio of M_w /M_n of less than about 2.5

11. The copolymer of claim 1 wherein said isoolefin and said para-alkylstyrene are present in said copolymer in amounts such that said isoolefin comprises from about 10 to 99.5 wt. % of said copolymer and said para-alkylstyrene comprises from about 0.5 to 90 wt. % of said copolymer.