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Co-polymerization of an isoolefin with a halogenated co-monomer

A comonomer, isoolefin technology, applied in the direction of rolling resistance optimization, road transportation emission reduction, etc., can solve problems such as undeveloped

Inactive Publication Date: 2011-11-02
LANXESS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the copolymerization of isobutene (IB) with 4-bromo-3-methyl-1-butene (BMB) has not been reported in the literature, so this particular comonomer remains unexplored

Method used

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  • Co-polymerization of an isoolefin with a halogenated co-monomer
  • Co-polymerization of an isoolefin with a halogenated co-monomer
  • Co-polymerization of an isoolefin with a halogenated co-monomer

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Experimental program
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Embodiment Construction

[0043] Copolymers are not limited to specific isoolefins. However, preference is given to isoolefins in the range of 4 to 16 carbon atoms, especially 4 to 7 carbon atoms, such as isobutene, 2-methyl-1-butene, 3-methyl-1-butene, 2- Methyl-2-butene, 4-methyl-1-pentene and mixtures thereof. Most preferred is isobutene.

[0044] Halogenated comonomers may include any suitable monomer which, when copolymerized with an isoolefin monomer, produces a non-vinyl, non-allyl primary bromide with an adjacent tertiary carbon. Preferably, the comonomer comprises a straight chain C having an alkene group at one end and a halogen group at its opposite end. 4 main chain. More preferably, the comonomer comprises 4 Alkyl group on the third carbon of the main chain. Still more preferably, the halogenated comonomer is of the formula:

[0045]

[0046] in,

[0047] R 1 is C 1 -C 20 Alkyl, C 1 -C 20 Straight-chain or branched alkenyl, or substituted aromatic hydrocarbons,

[0048] R ...

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Abstract

A co-polymer of isobutene and 4-bromo-3-methyl-1-butene formed by direct copolymerization in a single-step process. A continuous process for forming the co-polymer preferably comprises periodic or semi-continuous addition of catalyst to a mixed monomer solution. Semi-continuous reverse addition of the mixed monomer solution to a pre-provided catalyst solution may also be employed. The co-polymer exhibits allylic bromide functionality and is advantageously curable by either ZnO curing systems or sulfur-based curing systems.

Description

technical field [0001] The present invention relates to the direct copolymerization of isoolefins with halogenated comonomers. More specifically, the present invention relates to the formation of brominated copolymers by the direct copolymerization of isoolefin monomers and 4-bromo-3-methyl-1-butene monomers. Background technique [0002] Poly(isobutylene-co-isoprene) or IIR is a synthetic elastomer commonly referred to as butyl rubber that has been synthesized since the 1940s by combining isobutylene with small amounts of isoprene (1-2 mol%). Prepared by random cationic copolymerization. Due to its molecular structure, IIR has excellent gas impermeability, high loss modulus, oxidation stability and prolonged fatigue resistance. [0003] The first major application of IIR was for tire inner tubes. Despite a low degree of backbone unsaturation (ca. 0.8-1.8 mol%), IIR has sufficient vulcanization activity for tire innertube applications. With the development of tire innerl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/10C08F214/00C08F2/06
CPCC08F210/10C08F214/14C08F214/16C08F210/00C08F214/00
Inventor 朱迪特·E·普斯卡斯
Owner LANXESS INC
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