Borate Cocatalyst Composition for Hydrocarbon-Soluble Polymerization
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Solution Overview
Problem
Existing borate compounds used as cocatalysts in olefin and diene polymerization are not soluble in hydrocarbon solvents, particularly aliphatic hydrocarbons, and can act as catalyst poisons due to impurities, leading to reduced reaction efficiency.
Innovation Solution
A composition containing specific aryl-substituted borate compounds with large cations or hydrogen ions, combined in certain ratios, that are soluble in hydrocarbon solvents and do not generate catalyst poisons, using specific aryl groups and cations with defined carbon numbers and substitution patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If general tetrakis(pentafluorophenyl)borate compounds are used as cocatalysts, then thermal stability and catalytic activity are improved, but solubility in hydrocarbon solvents deteriorates
Solution Approach 1:
The invention changes the chemical structure parameters of the borate compound by introducing specific aryl groups with defined carbon numbers (6-14) and substitution patterns, along with specific cations, to achieve both thermal stability and solubility in hydrocarbon solvents simultaneously
Solution Approach 2:
The invention creates a composite cocatalyst system by combining specifically designed aryl-substituted borate anions with appropriate cations, achieving a material that exhibits both high thermal stability and good solubility in hydrocarbon solvents
2Ease of operation
If production methods using lithium tetrakis(pentafluorophenyl)borate and hydrochloride of dialkylmethylamine are used, then solubility in hydrocarbon solvents is improved, but catalyst poisoning by remaining impurities occurs
Solution Approach 1:
The invention extracts and eliminates harmful impurities such as lithium salts, ether complexes, and protic acid salts from the cocatalyst composition through careful selection of reaction conditions and purification steps, leaving only the active soluble borate compound
Solution Approach 2:
The invention uses readily available starting materials and straightforward purification methods to produce a high-purity cocatalyst, treating the purification process as a necessary step to remove disposable impurities that would otherwise poison the catalyst
3Ease of operation
If trialkylamine compounds with high basicity are used to improve solubility, then solubility in hydrocarbon solvents is improved, but catalyst poisoning occurs due to nucleophilic properties
Solution Approach 1:
The invention applies local quality by selecting cations with specific properties (low nucleophilicity and basicity) while maintaining the overall solubility of the borate compound through the aryl group substitution pattern, creating a localized optimization of chemical properties
Data Source
AI summary
The present invention aims to provide a borate compound-containing composition soluble in hydrocarbon solvents and useful as a cocatalyst for solution polymerization of olefins or dienes. According to the present invention, a composition containing a compound represented by the following formula (1), and a compound represented by the following formula (4): wherein each symbol is as defined in the specification, which is useful as a cocatalyst for polymerization of olefins or dienes, and a production method thereof can be provided.