Polyester Resin Heat Resistance Solubility Balance
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Solution Overview
Problem
Conventional polyester resins with a straight chain linear structure have low heat-resistance and solvent-solubility, limiting their industrial applications, despite efforts to improve these properties by copolymerizing monomers like isosorbide, which often results in deteriorated solvent-solubility.
Innovation Solution
A polyester resin is developed by copolymerizing a divalent acid component with a diol component comprising isosorbide, cycloaliphatic diol, and neopentyl glycol, achieving a glass transition temperature of 80°C or higher and improved solubility, using specific molar ratios and reaction conditions to balance heat-resistance and solvent-solubility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a polyester resin with a straight chain linear structure is used, then good processability is achieved, but heat-resistance and hardness are low
Solution Approach 1:
The patent applies composite materials by combining multiple diol components (isosorbide, cycloaliphatic diol, and neopentyl glycol) with a divalent acid component to create a polyester resin that integrates the benefits of different molecular structures. The cycloaliphatic diol provides rigid cyclic structures for heat-resistance, while neopentyl glycol contributes flexible aliphatic chains for processability, achieving a balance between opposing properties through material composition.
Solution Approach 2:
The patent applies local quality by incorporating specific diol components with distinct structural characteristics at different proportions. The cycloaliphatic diol provides localized rigid segments for heat-resistance, while neopentyl glycol provides localized flexible segments for processability. This spatial distribution of different structural qualities within the polymer chain enables simultaneous achievement of opposing properties.
2Temperature
If isosorbide is copolymerized to improve heat-resistance, then glass transition temperature increases, but solvent-solubility deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the proportions of different diol components. By adjusting the ratio of isosorbide to cycloaliphatic diol and neopentyl glycol within specific ranges, the patent optimizes the balance between glass transition temperature and solvent-solubility. This quantitative adjustment of compositional parameters enables simultaneous satisfaction of both requirements.
Solution Approach 2:
The patent applies composite materials by creating a multi-component diol system where isosorbide, cycloaliphatic diol, and neopentyl glycol work synergistically. The cycloaliphatic diol and neopentyl glycol components compensate for the reduced solubility caused by isosorbide, while maintaining the elevated glass transition temperature. This composite approach distributes the functional requirements across multiple components.
3Temperature
If the polymer structure is hardened to improve heat-resistance, then coating film hardness increases, but solvent-solubility decreases
Solution Approach 1:
The patent applies local quality by incorporating rigid cyclic structures from cycloaliphatic diol and isosorbide at specific locations within the polymer chain, while interspersing them with flexible aliphatic segments from neopentyl glycol. This creates a heterogeneous structure where localized rigid regions provide heat-resistance and localized flexible regions maintain solvent-solubility, resolving the contradiction between structure hardening and solubility.
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 high heat-resistance and good solubility in industrial solvents, enabling its use in coating compositions for various applications such as coatings for cans, electronic products, and building materials, while maintaining improved chemical and hydrolysis resistance.
Implementation Method 1
copolymerizing: (a) a divalent acid component; and (b) a diol component comprising isosorbide and a cycloaliphatic diol
Data Source
AI summary
The present invention relates to: a polyester resin having excellent heat resistance and solubility in solvents; and a coating composition which contains the same, and is thus capable of forming a coating film having excellent heat resistance, hardness, chemical resistance, pollution resistance, and hydrolysis resistance.