Spherical Polyester Resin Particles Transparency via Phase Transition
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Solution Overview
Problem
Existing methods for producing polyester-based resin particles result in low transparency when using polyester-based resins, as the crystallinity of the particles is not sufficiently low, necessitating further improvements.
Innovation Solution
Spherical polyester-based resin particles are produced by melting polyester-based raw material resin particles with an intrinsic viscosity of 0.6 dl/g or less at a temperature higher than their melting point by 80°C to form spheres, and then cooling them below the melting point to solidify, achieving a crystallinity of 20% or less and an average circularity of 0.96 or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If polyester-based resin particles are produced by conventional methods, then the particles can be manufactured, but the crystallinity is high resulting in poor transparency
Solution Approach 1:
The invention changes the melting temperature parameter to be 80°C or higher above the melting point of the resin particles, and controls the cooling rate to achieve crystallinity of 20% or less. This parameter optimization resolves the contradiction by enabling sufficient transparency while maintaining manufacturability.
Solution Approach 2:
The invention utilizes phase transition during melting and cooling to control crystallinity. By melting at high temperature (80°C or more above melting point) and then cooling at controlled rates, the phase transition process is optimized to produce particles with crystallinity of 20% or less, achieving the required transparency.
2Illumination intensity
If the melting temperature is increased by 80°C or more above the melting point, then transparency is improved through reduced crystallinity, but energy consumption increases
Solution Approach 1:
The invention optimizes the melting temperature parameter to the minimum required level (80°C or more above melting point) to achieve the target crystallinity of 20% or less. This controlled parameter change balances transparency improvement with energy consumption, avoiding excessive temperature increases.
Solution Approach 2:
The invention maintains continuous heating and melting action at the optimized temperature level, ensuring that the high temperature is sustained just long enough to achieve the required crystallinity reduction, then immediately transitions to cooling. This continuous action minimizes energy waste while achieving the transparency goal.
3Productivity
If the particles are cooled rapidly to solidify, then production efficiency is improved, but crystallinity may increase reducing transparency
Solution Approach 1:
The invention utilizes controlled phase transition during cooling, where the cooling rate is optimized to allow partial crystallization while maintaining overall low crystallinity (20% or less). This controlled phase transition enables rapid cooling for efficiency while preserving transparency.
Solution Approach 2:
The invention changes the cooling rate parameter to achieve the optimal balance between production efficiency and transparency. By controlling the cooling rate to produce crystallinity of 20% or less, the invention enables rapid solidification without sacrificing the transparency required for optical applications.
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
This method produces polyester-based resin particles with excellent transparency, suitable for applications in cosmetics, optical films, and other materials, enhancing their light diffusibility and optical properties.
Implementation Method 1
melting polyester-based raw material resin particles having an intrinsic viscosity of 0.6 dl/g or less at a temperature higher than a melting point of the particles by 80° C. or more to form into spheres
Implementation Method 2
cooling the particles after formation into spheres at a temperature equal to or lower than the melting point to solidify
Data Source
AI summary
Spherical polyester-based resin particles characterized in that the spherical polyester-based resin particles contain a polyester-based resin and have a crystallinity of 20% or less and an average circularity of 0.96 or more. The spherical polyester-based resin particles according to the present invention can provide suitable resin particles as compounding agents for cosmetics such as foundation, antiperspirants, and skin scrubs; various agents such as matte coating agents for paints, rheology modifying agents, antiblocking agents, slipperiness-imparting agents, light diffusion agents, electroconductive agents, and diagnostic testing agents for medical use; and additives to molded articles such as automobile materials and construction materials.