Polyester Resin Crystallization via Sulfonamide Metal Salts
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Solution Overview
Problem
Polyester resins have low crystallization rates and limited molding conditions, restricting their use as molding materials due to low heat distortion temperatures and narrow processing windows, despite their excellent heat and chemical resistance.
Innovation Solution
Adding a metal salt of a predetermined sulfonamide compound and an aliphatic carboxylic acid diester compound of polyalkylene glycol to the polyester resin to enhance crystallization rates and moldability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyester resin is used as a molding material, then excellent heat resistance and chemical resistance are achieved, but the crystallization rate is extremely low and the molding cycle is prolonged
Solution Approach 1:
The patent introduces a specific metal salt compound as an intermediary substance to facilitate the crystallization process of polyester resin. This compound acts as a mediator between the resin molecules, promoting ordered arrangement and accelerating crystallization without compromising the inherent heat and chemical resistance properties of the polyester resin.
Solution Approach 2:
The patent modifies the crystallization parameters of polyester resin by adding a metal salt compound containing specific metal atoms. This changes the physical and chemical parameters of the system, particularly the crystallization rate and temperature, while maintaining the base resin's functional properties.
2Productivity
If a nucleator is added to improve the crystallization rate of polyester resin, then the molding cycle is shortened, but the heat distortion temperature of molded products remains low
Solution Approach 1:
The patent applies local quality by introducing a metal salt compound with specific metal atoms that locally enhance crystallization activity at nucleation sites. This localized action accelerates crystallization without requiring a uniform change in the entire resin system that would compromise heat distortion temperature.
3Productivity
If the crystallization rate is improved to increase production volume, then productivity increases, but the range of molding conditions becomes narrower
Solution Approach 1:
The patent introduces a metal salt compound that dynamically facilitates crystallization across a broader range of conditions. The compound adapts to different molding parameters, maintaining effective crystallization promotion whether the molding cycle is short or long, thereby expanding rather than narrowing the process window.
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 combination significantly improves crystallization rates and moldability, allowing for higher production volumes and improved thermal performance of molded products.
Implementation Method 1
A generally known method for improving the crystallization rates of polyester resins includes adding a nucleator
Data Source
AI summary
To provide a polyester resin composition having a high crystallization rate and excellent moldability.A polyester resin composition comprising (a) a polyester resin,(b) one or more sulfonamide compound metal salt having a structure represented by a general formula selected from the group consisting of the following general formula (1):the following general formula (2):and the following general formula (3):and (c) an aliphatic carboxylic acid diester compound of polyalkylene glycol represented by the following general formula (4):(in the formula (4), G represents an alkylene group having 2 to 4 carbon atoms; R4 and R5 each independently represent an alkyl or alkenyl group having 1 to 14 carbon atoms; and m represents a integral number of 2 to 30).