Process for producing heat treated supported aluminoxanes in an aliphatic solvent using solid aluminoxanes

EP4493600A1Pending Publication Date: 2025-01-22WR GRACE & CO CONN
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Patent Information

Application Number
EP2022932468
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2022-03-17
Filing Date
2022-12-15
Publication Date
2025-01-22

AI Technical Summary

Technical Problem

Conventional methods for producing polyolefins using single-site catalysts often result in residual toluene contamination, which is a concern for applications in the food and beverage industries, as there is a need for polyolefins with lower aromatic compound levels.

Method used

A process involving the formation of a slurry with an inorganic oxide support, a solid aluminoxane activator, and an organic solvent with branched aliphatic compounds, where the slurry is heated and then cooled before contacting with a single-site catalyst component, ensuring a high percentage of the solvent is non-aromatic and has a boiling point above 100°C, thereby minimizing residual solvent content.

Benefits of technology

This process effectively reduces the residual solvent content, particularly aromatic solvents, in the supported single-site catalyst, enabling the production of polyolefins with lower aromatic compound levels, thus addressing the industry's requirements.

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Abstract

A process for producing a supported single-site catalyst is provided. The process includes forming a slurry comprising an inorganic oxide support, an organic solvent, and a solid aluminoxane activator; maintaining the temperature of the slurry from about 100°C to about 200°C for a time period from about 0.5 to about 10 hours to form a supported aluminoxane slurry; and contacting the supported aluminoxane slurry with a single-site catalyst component to form a supported single-site catalyst. The organic solvent includes one or more branched aliphatic compound having a boiling point of about 100°C or greater and is present in an amount of about 50 wt.% or greater with respect to the total amount of the organic solvent.
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