Process for the production of modified butyl rubber

A technology of derivatives and ionomers, applied in the field of modified ionomers and their production

Inactive Publication Date: 2016-10-12
ARLANXEO CANADA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also, for high-purity applications, extractables containing excess residual nucleophile would not be suitable for such applications

Method used

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  • Process for the production of modified butyl rubber
  • Process for the production of modified butyl rubber
  • Process for the production of modified butyl rubber

Examples

Experimental program
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Effect test

Embodiment approach

[0053] The ionomers produced according to the method of the present invention have improved color properties which make the ionomers particularly suitable for use in films and coatings. The yellowness index, as defined in ASTM E313, is a measure of how far an object deviates toward yellow from the preferred white. According to one embodiment of the present invention, as measured according to ASTM E313, the yellowness index of the polymer is between about 1-100, preferably between about 10-70, more preferably between about 20-60, even more Preferably between about 20-41.

[0054] Without being bound by a particular theory, it is believed that the yellowness index may be at least partially related to polymer degradation, as indicated by the level of isoprene in the final polymer. Degradation of ionomers is most facile at the 1,4-isoprene polyene segment, as opposed to the isobutylene segment of the polymer chain. A decrease in the level of 1,4-isoprene thus indicates degradati...

Embodiment 1

[0079] Example 1: Comparative example, as described in US Patent 7,662,480:

[0080] Add 48g (100phr) of LANXESS BB2030 TM and 4.7 g (9.7 phr, 3 molar equivalents, based on the allyl bromide content) of triphenylphosphine were added to a Brabender internal mixer (capacity 75 g) operated at 100°C and a rotor speed of 60 rpm. Mixing was carried out for a total of 60 minutes. The properties obtained are shown in Table 2, most notably, significant amounts of residual / unbound TPP and its oxidized derivative triphenylphosphine oxide (TPP=O).

Embodiment 2

[0081] Example 2: Comparative example, as described in WO 2012083419:

[0082] Allow mixing LANXESS BB2030 alone before adding TPP (4.3phr) TM (100phr) for a short time, then mix for 10 minutes. The properties obtained are shown in Table 2, most notably the residual / unbound TPP and its oxidized derivative triphenylphosphine oxide (TPP=O) showing 65% conversion.

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Abstract

There is provided a process for producing an ionomer comprising the steps of (a) admixing in a mixer a halogenated copolymer with at least one nitrogen and/or phosphorus based nucleophile and (b) extruding the mixture from step (a). The process takes place with high conversion and the resulting ionomer contains a low amount of residual nucleophile and has a low yellowness index.

Description

technical field [0001] The present invention relates to modified ionomers and methods for their production. Background technique [0002] Poly(isobutylene-co-isoprene) or IIR is a synthetic elastomer, commonly known as butyl rubber (or butyl polymer), which has been synthesized since the 1940s by isobutylene with small amounts of isoprene ( Usually not more than 2.5mol%) prepared by random cationic copolymerization. As a result of its molecular structure, IIR has superior gas impermeability, high loss modulus, oxidation stability and prolonged fatigue resistance. [0003] Halogenation of butyl rubber produces reactive allyl halide functionality in the elastomer. Conventional butyl rubber halogenation processes are described, for example, in Ullmann's Encyclopedia of Industrial Chemistry (Fifth, Completely Revised Edition, Volume A231 Editors Elvers, et al.) and / or "Rubber Technology" (Third Edition) by Maurice Morton, Chapter 10 (Van Nostrand Reinhold 1987), especially ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/40C08F210/12C08F8/30C08L23/32C08L23/36
CPCC08F8/30C08F210/12C08L23/22C08L23/283C08L11/00C08J3/12C08K5/0083C08K5/16C08K5/50C08F8/06C08C19/32C08L15/02C08L101/00
Inventor 达娜·阿德金森肖恩·马姆伯格
Owner ARLANXEO CANADA INC
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