Polyester Resin Composition for Adhesion and Grindability
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Solution Overview
Problem
Existing polyester resins suffer from inadequate adhesiveness and grindability, limiting their effectiveness in applications such as coating agents and adhesives.
Innovation Solution
A polyester resin composition incorporating a constitutional unit derived from a carboxylic acid with a cyclic structure containing 5 or more carboxyl groups, along with units from terephthalic and isophthalic acids, is produced using a polymerization catalyst containing titanium, alkaline earth metals, and phosphorus, optimizing the resin's adhesiveness and grindability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a polyester resin is designed to improve grindability by copolymerizing a trifunctional monomer (as in Patent Document 1), then grindability is improved, but adhesiveness becomes insufficient
Solution Approach 1:
The invention changes the chemical parameters of the polyester resin by incorporating specific constitutional units (A from cyclic carboxylic acid with 5+ carboxyl groups, B from terephthalic acid, C from isophthalic acid) in controlled molar ratios. This parameter optimization resolves the contradiction by achieving both improved grindability and adhesiveness simultaneously, unlike prior art that sacrificed adhesiveness for grindability.
Solution Approach 2:
The invention creates a composite molecular structure within the polyester resin by combining multiple types of constitutional units (A, B, and C) with specific functional properties. Unit A provides grindability enhancement, while units B and C contribute to adhesiveness, creating a synergistic composite material that overcomes the limitations of single-function monomers.
2Reliability
If a polyester resin is designed to have low acid value for excellent impact stability and adhesiveness (as in Patent Document 2), then adhesiveness and impact stability are improved, but grindability becomes insufficient
Solution Approach 1:
The invention optimizes the molar ratio parameters of constitutional units to achieve the desired balance. Specifically, unit A is controlled at 0.01-45 parts by mole per 100 parts by mole of dicarboxylic acid units, while units B and C are each 2-47 parts by mole per 100 parts by mole of dicarboxylic acid units. These parameter changes simultaneously improve grindability while maintaining low acid value for adhesiveness.
3Adaptability or versatility
If existing polyester resins are used for coating agents and adhesives, then basic functionality is provided, but adhesiveness and grindability are insufficient
Solution Approach 1:
The invention modifies the chemical composition parameters of the polyester resin to enhance performance in coating and adhesive applications. The specific incorporation of constitutional units A, B, and C in optimized ratios improves both adhesiveness and grindability, making the resin more versatile and reliable for various applications including coating agents, adhesives, ink binders, and toner binders.
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 resulting polyester resin exhibits enhanced adhesiveness and grindability, improving the performance of coating agents and adhesives, with improved solvent solubility and transparency.
Implementation Method 1
polymerizing a monomer mixture containing a carboxylic acid having a cyclic structure and containing 5 or more carboxyl groups and a polyhydric alcohol in the presence of a polymerization catalyst A, wherein the polymerization catalyst A is a compound containing a titanium atom, an alkaline earth metal atom, a phosphorus atom, and carbon atoms
Data Source
AI summary
Provided is a polyester resin having excellent adhesiveness and excellent grindability. One aspect of the polyester resin of the present invention is a polyester resin including a constitutional unit A derived from a carboxylic acid having a cyclic structure and containing 5 or more carboxyl groups and a constitutional unit derived from a dicarboxylic acid, in which the constitutional unit A has a content of 0.01 parts by mole or more and 45 parts by mole or less with respect to 100 parts by mole of the constitutional unit derived from a dicarboxylic acid.