Multilayer Polyester Sheet Isosorbide Coating Thermal Resistance
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Solution Overview
Problem
Multilayer polyester sheets known in the art do not adequately secure thermal resistance, chemical resistance, and impact resistance, leading to deformation under heat sources, chemical substances, or external impacts, limiting their application in packaging materials.
Innovation Solution
A multilayer polyester sheet with a substrate layer and a coating layer containing a polyester resin with 51 mol% to 85 mol% isosorbide residue, which enhances thermal resistance, chemical resistance, and impact resistance by controlling the composition and thickness of the coating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional multilayer polyester sheet is used, then it can be manufactured at a low price, but it does not sufficiently secure thermal resistance, chemical resistance, and impact resistance
Solution Approach 1:
The patent changes the chemical composition parameters of the polyester resin by specifying precise molar ratios of diol components (1,4-cyclohexanedimethanol at 40-70 mol%, isosorbide at 10-50 mol%) and dicarboxylic acid components (terephthalic acid at 70-95 mol%, cyclohexane-1,3-dicarboxylic acid at 5-30 mol%). This parameter optimization resolves the contradiction by achieving superior thermal and chemical resistance while maintaining manufacturing feasibility through established polymer chemistry processes
Solution Approach 2:
The patent creates a composite polyester resin system by combining multiple diol and dicarboxylic acid components in specific ratios. The synergistic interaction between 1,4-cyclohexanedimethanol (providing thermal stability), isosorbide (enhancing chemical resistance), and the dicarboxylic acid mixture (optimizing mechanical properties) resolves the contradiction by delivering enhanced reliability without sacrificing ease of manufacture through complex composite formulation
2Reliability
If the coating layer thickness is increased to improve physical properties, then thermal resistance and chemical resistance are enhanced, but the sheet becomes more prone to deformation under external impact
Solution Approach 1:
The patent resolves this contradiction by changing the chemical composition parameters of the polyester resin rather than relying solely on thickness adjustment. By optimizing the diol component ratios (1,4-cyclohexanedimethanol 40-70 mol%, isosorbide 10-50 mol%) and dicarboxylic acid component ratios (terephthalic acid 70-95 mol%, cyclohexane-1,3-dicarboxylic acid 5-30 mol%), the resin achieves balanced thermal resistance, chemical resistance, and impact resistance simultaneously
Solution Approach 2:
The patent applies local quality by creating a coating layer with distinct chemical composition optimized for surface performance. The coating layer contains the specifically formulated polyester resin that provides enhanced thermal and chemical resistance at the surface, while the overall sheet structure maintains appropriate mechanical properties including impact resistance through the balanced composition of the resin system
3Reliability
If a multilayer polyester sheet with optimized physical properties is developed, then thermal resistance, chemical resistance, and impact resistance are improved, but the appearance characteristics may be compromised
Solution Approach 1:
The patent resolves this contradiction through precise parameter changes in the polyester resin composition. By controlling the molar ratios of diol components (1,4-cyclohexanedimethanol 40-70 mol%, isosorbide 10-50 mol%) and dicarboxylic acid components (terephthalic acid 70-95 mol%, cyclohexane-1,3-dicarboxylic acid 5-30 mol%), the invention achieves both enhanced physical properties and maintained appearance characteristics
Solution Approach 2:
The patent applies local quality by creating a coating layer with optimized chemical composition that provides enhanced thermal and chemical resistance while maintaining appropriate optical and surface properties. The coating layer's specific resin formulation ensures that appearance characteristics are preserved even as physical resistance properties are enhanced
Data Source
AI summary
The present invention relates to a multilayer polyester sheet, comprising: a substrate layer including a thermoplastic resin; and a coating layer formed on at least one surface of the substrate layer and contains a polyester resin including a residue of a diol component including 51 mol% to 85 mol% of isosorbide and a residue of a dicarboxylic acid component, and a molded product of the same.