Polyester Sheet Light Reflection via 4-Methyl-1-Pentene Dispersion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional polyester sheets for reflective applications face limitations in light reflection performance, mechanical strength, and production complexity, particularly in achieving high luminance and reducing power consumption for display devices like liquid crystal displays and solar cells.
Innovation Solution
A polyester sheet composition comprising a polyester, a 4-methyl-1-pentene polymer, and a compatibilizing agent in specific proportions, which enhances light reflectance, mechanical strength, and dimensional stability by optimizing the dispersion of the 4-methyl-1-pentene polymer within the polyester matrix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If inorganic particles such as titanium oxide are used to improve light reflectance, then light reflection performance is enhanced, but the reflectance of specific wavelength regions deteriorates and the screen darkens
Solution Approach 1:
The patent changes the material parameter from inorganic particles to a specific organic polymer (4-methyl-1-pentene polymer) with controlled physical properties (melting point 160-200°C, heat of fusion 20-60 J/g). This parameter change eliminates wavelength-specific absorption while maintaining high light reflectance across all visible wavelengths, preventing screen darkening.
Solution Approach 2:
The patent replaces expensive inorganic particles with a cost-effective organic polymer that achieves superior light reflection performance. The polymer-based solution provides broadband reflectance without the harmful wavelength-specific absorption characteristics of inorganic materials.
2Illumination intensity
If finer and more numerous pores are formed to improve light reflection performance, then light reflectivity increases, but mechanical strength may be compromised
Solution Approach 1:
The patent changes the pore formation mechanism by controlling the melting and solidification parameters of the 4-methyl-1-pentene polymer. By adjusting the melting point (160-200°C) and heat of fusion (20-60 J/g), the polymer forms fine pores during cooling that provide high light reflection while the controlled crystallization maintains mechanical strength.
Solution Approach 2:
The patent creates a composite structure where the 4-methyl-1-pentene polymer dispersion phase forms a fine pore network within the polyester continuous phase. This composite architecture provides both high light reflectivity through numerous fine pores and adequate mechanical strength through the polyester matrix.
3Illumination intensity
If a multilayer structure is used to achieve high light reflection performance, then luminance improves, but the production process becomes complicated and not economical
Solution Approach 1:
The patent merges the light reflection function and pore formation function into a single polymer component (4-methyl-1-pentene polymer). This single-component approach eliminates the need for multilayer structures while achieving high luminance, thereby simplifying the production process and reducing manufacturing costs.
Solution Approach 2:
The 4-methyl-1-pentene polymer performs multiple functions simultaneously: it acts as a dispersion phase for creating fine pores, provides the pore-forming mechanism during solidification, and delivers high light reflection performance. This multi-functionality replaces what would otherwise require multiple separate layers.
4Illumination intensity
If the size of dispersion phase of incompatible resin is reduced to improve light reflection performance, then light reflectance increases, but production complexity increases due to process control requirements
Solution Approach 1:
The patent changes the compatibility parameter by selecting a polymer (4-methyl-1-pentene) with specific thermal properties (melting point 160-200°C, heat of fusion 20-60 J/g) that naturally phase-separates into fine dispersion during solidification. This parameter selection achieves fine dispersion and high light reflectance through controlled phase separation rather than complex mixing processes.
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 sheet exhibits improved light reflectance, mechanical strength, and dimensional stability, meeting the demands for high luminance and reduced power consumption while simplifying the production process.
Implementation Method 1
utilizing the light reflection at the interfaces of the inorganic particles with the polyester and the interfaces of the fine pores formed around the fine particles as cores
Implementation Method 2
have excellent light scuttering properties
Data Source
AI summary
An object of the present invention is to provide a polyester sheet having better light reflection performance than a conventional polyester sheet while maintaining the excellent properties, such as high mechanical strength, dimensional stability, and durability, inherent in polyester. The present invention relates to a polyester sheet including a polyester (A), a 4-methyl-1-pentene polymer (B) having a specific heat of fusion and a meso diad fraction (m) of 98.5 to 100%, and a compatibilizing agent (C), wherein content proportions of the (A), (B), and (C) are 60 to 98.9 parts by mass for (A), 1 to 25 parts by mass for (B), and 0.1 to 15 parts by mass for (C), when a total content of (A), (B), and (C) is set as 100 parts by mass, and wherein the (B) satisfies the following requirements (a) to (d): (a) an amount of a constitutional unit derived from 4-methyl-1-pentene is 100 to 90% by mol and a total amount of a constitutional unit derived from at least one α-olefin selected from ethylene and α-olefins having 3 to 20 carbon atoms (except for 4-methyl-1-pentene) is 0 to 10% by mol; (b) a heat of fusion ΔHm (units: J/g) and a melting point Tm (units: °C) measured by differential scanning calorimetry (DSC) satisfy the following requirements (1) and (2): (1) ΔHm≥0.5×Tm−76 (2) Melting point Tm: 200 to 260°C; (c) a melt flow rate (MFR) measured under conditions of 260°C and a 5 kg load in conformity to ASTM D1238 is 0.1 to 500 g/10 min; and (d) a meso diad fraction (m) measured by 13C-NMR is 98.5 to 100%.