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Anti-agglomerants for the rubber industry

a technology for rubber and agglomerates, applied in the field of anti-agglomerants for the rubber industry, can solve the problems of fatty acid salts of mono- or multivalent metal ions, rapid formation of non-dispersed mass of rubber in process water, fouling and plugging of process,

Active Publication Date: 2019-08-20
ARLANXEO SINGAPORE PTE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a method for making an aqueous slurry containing elastomer particles suspended therein using a special process involving an organic medium and a LCST compound. This method allows for the efficient and effective removal of the organic diluent to create a high-quality aqueous slurry that is suitable for use in various applications.

Problems solved by technology

In the absence of an anti-agglomerant the naturally high adhesion of butyl rubber would lead to rapid formation of a non-dispersed mass of rubber in the process water, plugging the process.
In addition to particle formation, sufficient anti-agglomerant must be added to delay the natural tendancy of the formed butyl rubber particles to agglomerate during the stripping process, which leads to fouling and plugging of the process.
The fundamental disadvantage of fatty acid salts of a mono- or multivalent metal ion, in particular sodium, potassium, calcium or zinc stearate or palmitate is the high loadings required to achieve sufficient anti-agglomeration effects.
At these high levels of anti-agglomerant loadings, issues with turbidity, optical appearance and high ash content of the resulting polymer become a problem in subsequent applications such as sealants and adhesives.
A variety of other elastomers either obtained after polymerization or after post-polymerization modification in organic solution or slurry are typically subjected to an aqueous workup where the same problems apply as well.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples 1 to 4a

Elastomer Particle Formation:

[0427]In an experiment to demonstrate the ability of methyl cellulose to form an aqueous slurry the following experiments were carried out. Isoprene (0.41 g) and isobutylene (13.50 g) were combined with methyl chloride (200 g at −95° C. under an inert atmosphere. A solution of aluminium trichloride (3 g / l) as a lewis acid in methyl chloride (3 mL at −95° C.) was then added with agitation to the reaction mixture to initiate polymerization. Residual traces of water of around 25 ppm within the organic diluent served as initiator. This reaction produced 10 g of butyl rubber with an isoprene level of 2 mol-% in form of finely dispersed particles in methyl chloride and comprising no anti-agglomerants of any kind.

[0428]The resulting mixture was then poured into a 2 L vessel comprising 1 L of water as the aqueous medium and maintained at 85° C. agitated with an impeller at 1000 RPM. The hot water caused the flashing of diluent and residual monomers, leaving behi...

examples 4d

) and 4e)

Continuous Elastomer Particle Formation:

[0432]Isobutylene and isoprene were combined with methyl chloride to prepare a polymerization feedstock such that the total concentration of the monomers was from approximately 10-40 wt.-%. This feedstock stream was cooled to approximately −100° C. and was fed continuously into an agitated reaction vessel, also maintained at −100° C. In the reaction vessel the feedstock was mixed with a continuously added the initiator system stream, a solution of 0.05-0.5 wt.-% aluminium trichloride in methyl chloride as diluent which is typically activated by traces of water from the diluent. The addition rates of the feedstock stream and the initiator system stream were adjusted to provide an isobutylene isoprene elastomer with a mooney viscosity of approximately 34 and an unsaturation level of approximately 1 mol-%. Typically, the wt.-ratio of monomers in the feedstream to aluminum trichloride was held within a range of 500 to 10000, preferably 50...

example 4d

Total unsaturation: 0.9 mol-%

Mw: 436,000

Polydispersity (Mw / Mn): 3.28

Mooney viscosity (ML 1+8 at 125° C., ASTM D 1646): 34

Calcium stearate content: 0.73 wt.-% (GC-FID, FTIR)

Irganox® 1010: 0.035 wt.-%

Volatiles: 0.09 wt.-%

Other antiagglomerants, surfactants, emulsifiers: see above

Ions: (ICP-AES)

Aluminum (from catalyst): 70 ppm

Magnesium: 32 ppm

Other multivalent metal ions (Mn, Pb, Cu, Cr, Ba, Fe, Zn): 4 ppm

Monovalent metal ions (Na, K): 22 ppm

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PUM

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Abstract

The invention relates to a method to reduce or prevent agglomeration of rubber particles in aqueous media by LCST compounds and elastomers obtained thereby. The invention further relates to elastomer products comprising the same or derived therefrom.

Description

FIELD OF THE INVENTION[0001]The invention relates to a method to reduce or prevent agglomeration of rubber particles in aqueous media by LCST compounds and elastomers obtained thereby. The invention further relates to elastomer products comprising the same or derived therefrom.BACKGROUND[0002]Rubbers in particular those comprising repeating units derived from isoolefins are industrially prepared by carbocationic polymerization processes. Of particular importance is butyl rubber which is a elastomer of isobutylene and a smaller amount of a multiolefin such as isoprene.[0003]The carbocationic polymerization of isoolefins and its elastomerization with multiolefins is mechanistically complex. The initiator system is typically composed of two components: an initiator and a Lewis acid co-initiator such as aluminum trichloride which is frequently employed in large scale commercial processes.[0004]Examples of initiators include proton sources such as hydrogen halides, alcohols, phenols, car...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C08L23/22C08J3/14C08J3/07C08J3/24C08L23/08
CPCC08L23/22C08J3/07C08J3/14C08J3/24C08L23/0815C08J2300/26C08J2323/22C08L2205/06C08J2401/28C08L2201/54C08L2205/025B60C1/00C08F8/20C08J3/03C08J3/20
Inventor THOMPSON, DAVIDLUND, CLINTON
Owner ARLANXEO SINGAPORE PTE LTD
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