Copolymerized Polyester Resin with Isosorbide and CHDM
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Solution Overview
Problem
Current polyester resins copolymerized with isosorbide and terephthalic acid face limitations in achieving high heat-resistance and impact strength, particularly when attempting to enhance heat-resistance through stretching or crystallization, and the addition of glass fiber compromises transparency.
Innovation Solution
A method for preparing a copolymerized polyester resin using a combination of terephthalic acid, 1,4-cyclohexane dimethanol, and isosorbide as diol components, with specific mole ratios and reaction conditions to achieve an alternating structure, enhancing both heat-resistance and impact strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If isosorbide is used as a monomer to enhance heat-resistance, then heat-resistance is improved, but impact strength is insufficient and transparency is compromised when glass fiber is added
Solution Approach 1:
The patent combines isosorbide (for heat-resistance) with 1,4-cyclohexane dimethanol (for impact strength) and terephthalic acid to create a composite polyester resin system. This composite approach allows simultaneous achievement of high heat-resistance (Tg > 90°C) and high impact strength (notch izod impact strength > 50 J/m) without requiring glass fiber reinforcement that would compromise transparency.
2Strength
If glass fiber is added to enhance impact strength, then impact strength is improved, but transparency is extremely lowered
Solution Approach 1:
The patent changes the chemical composition parameters of the polyester resin by incorporating 1,4-cyclohexane dimethanol and isosorbide in specific ratios. This chemical parameter modification inherently provides high impact strength (notch izod impact strength > 50 J/m) without requiring physical reinforcement with glass fibers, thereby maintaining the transparency of the resin for optical applications.
3Ease of manufacture
If polyester is copolymerized with multiple glycol components to improve moldability, then moldability is enhanced, but heat-resistance enhancement through stretching or crystallization becomes difficult
Solution Approach 1:
The patent modifies the chemical structure parameters of the polyester by selecting specific glycol components (1,4-cyclohexane dimethanol and isosorbide) with appropriate molecular structures and reactivity. This chemical composition adjustment enables the resin to maintain good moldability while achieving high heat-resistance (Tg > 90°C) intrinsically, eliminating the need for post-processing stretching or crystallization to enhance heat resistance.
Data Source
AI summary
A polyester resin copolymerized with isosorbide and 1,4-cyclohexane dimethanol and having an improved impact strength, and a method for preparing the same are disclosed. The copolymerized polyester resin has an alternating structure of acid moieties which are derived from acid components and diol moieties which are derived from diol components, wherein the acid components comprise terephthalic acid, and the diol components comprise (i) 5 ~ 99 mol% of 1,4-cyclohexanedimethanol and (ii) 1 ~ 60 mol% of isosorbide with respect to the total diol components.