Phthalate-Free Olefin Polymerization Procatalyst
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Solution Overview
Problem
There is a need for phthalate-free catalysts for polymerization of olefins that offer good catalyst performance and polymer properties, as existing catalysts often rely on phthalate-based internal electron donors.
Innovation Solution
A procatalyst system using a novel internal electron donor compound represented by Formula A, comprising a carbonate-carbamate structure with a titanium-supported magnesium catalyst, which includes an internal electron donor that can be either hydrogen or methyl-substituted, providing effective control of stereochemistry in olefin polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phthalate-based internal electron donors are used in Ziegler-Natta catalysts, then good catalyst performance and stereochemical control are achieved, but the presence of phthalates creates harmful effects requiring their removal
Solution Approach 1:
The invention changes the chemical structure of the internal electron donor from phthalate-based to carbonate-carbamate-based (Formula A), maintaining the functional properties while eliminating the harmful phthalate groups. This structural parameter change allows the catalyst to retain stereochemical control capabilities without introducing harmful substances into the polymer product.
Solution Approach 2:
The invention uses a readily available and structurally simple carbonate-carbamate compound (Formula A) as the internal electron donor, replacing complex phthalate structures. This simpler molecular structure achieves the same catalytic function without the harmful effects, effectively using a 'simpler substitute' that eliminates the problem while maintaining performance.
2Object-affected harmful factors
If novel phthalate-free internal electron donors are developed, then harmful phthalate effects are eliminated, but catalyst performance and polymer properties may be compromised
Solution Approach 1:
The invention optimizes the structural parameters of the carbonate-carbamate compound (Formula A), specifically the R groups attached to the carbamate nitrogen, to achieve the desired balance between eliminating phthalates and maintaining catalytic performance. By carefully selecting and adjusting these molecular parameters, the catalyst achieves both safety and effectiveness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The procatalyst system achieves good control of stereochemistry and yields polyolefins with improved properties, including higher yield and specific polymer characteristics such as isotacticity, while being free from phthalates, thus addressing the industry's need for phthalate-free catalysts.
Implementation Method 1
internal electron donor that can be either hydrogen or methyl-substituted, providing effective control of stereochemistry in olefin polymerization
Data Source
AI summary
The present invention relates to a procatalyst comprising the compound represented by formula A as an internal electron donor, Formula A wherein R is hydrogen or a methyl group, N is nitrogen atom; O is oxygen atom; and C is carbon atom. The present invention also relates to a process for preparing said polymerization procatalyst and to a polymerization catalyst system comprising said procatalyst, a co-catalyst and optionally an external electron donor. Furthermore, the present invention relates to a polyolefin obtainable by the process according to the present invention and to the use of the compound of formula A as in internal electron donor in catalysts for polymerization of olefins.