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Method for forming highly reactive olefin functional polymers

A technology of external olefins and complexes, applied in the field of forming highly reactive olefin functional polymers, can solve the problems of low conversion rate and impracticality

Active Publication Date: 2019-08-02
UNIV OF MASSACHUSETTS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in aluminum-based systems, such large amounts of tertiary alcohols would act as poisons, reducing conversion to low and commercially impractical levels

Method used

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  • Method for forming highly reactive olefin functional polymers
  • Method for forming highly reactive olefin functional polymers

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Embodiment

[0035] The EADC·CEE complex was prepared just before IB polymerization. In the glove box, add the required amount of ether to the EADC hexane solution and stir to form a Lewis acid / ether complex, then add the required amount of hexane to make a fully soluble 0.1M complex . Polymerized in dry N 2 This was performed in an MBraun glove box (MBraun, Inc. Stratham, NH) under atmosphere. Typically, the required amount of hexane was placed in a polymerization reactor, screw cap culture tube (75 mL) at -30°C. Then, the initiator (t-BuCl) was added to the reactor followed by tert-butanol (Table 1) or t-BuOAlCl 2 (Table 2). Condensate and partition the IB into t-BuCl, tert-butanol or t-BuOAlCl 2 and hexane polymerization reactor. Polymerization was initiated by adding EADC·CEE complex to the reactor at the polymerization temperature and treated with ammonium hydroxide (NH 4 OH) or methanol to terminate the polymerization reaction. The resulting polymers were analyzed as describe...

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Abstract

The invention relates to a method for forming highly reactive olefin functional polymers. An improved process for the preparation of polybutene having an exo-olefin content of at least 50 mol. % by the polymerization of iso-butene, or a C4 feed containing iso-butene and other C4 olefins using (i) a Lewis acid.cndot.Lewis base catalyst complex and an alkyl halide initiator, in a substantially or completely apolar polymerization medium, in the presence of a hindered alcohol or alkoxyaluminum dichloride. In the above polymerization reaction, it has been found that a hindered alcohol or hindered alkoxyaluminum dichloride will function as an ''exo enhancer'' resulting in high isobutene conversion and the production of a polybutene product having a high terminal vinylidene content, while maintaining a target molecular weight.

Description

Background technique [0001] Dispersants based on polybutylene succinimide are ubiquitous in lubricating oils worldwide. A key step in the preparation of these dispersants is the maleation of polybutene to polybutene succinic anhydride, which is further aminated with polyamines to produce succinimide. The maleation process is facilitated by polyisobutylene (PIB) having a high level of vinylidene groups at the polymer ends, which reacts smoothly with maleic anhydride in heat or "ene" without the need for chlorine as a promoter. This polymer is known as Highly Reactive PIB or HR-PIB and is preferred industrially for its process, performance and environmental benefits. [0002] Existing methods for the manufacture of HR-PIB by cationic polymerization of isobutene (IB) utilize BF associated with a range of alcohols and / or ethers 3 catalysts, which typically require pure IB feeds, very low temperatures and a fluorine clean-up step (Mach et al., Lubr. Sci. 1999 11(2) 175-185). Suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/10C08F4/54
CPCC08F10/10C08F4/54C08F110/10C08F4/52C08F2500/02C08F2500/03C08F2500/28C08F2500/29C08F2/38C08F4/14
Inventor R·浮士德J·艾梅尔特P·迪米特洛夫P·霍宾K·内斯蒂
Owner UNIV OF MASSACHUSETTS