Lactone-Ring Acrylic Polymer for Heat-Resistant Optical Molding
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Solution Overview
Problem
Existing acrylic polymers with ring structures face challenges in heat resistance, melt flowability, and discoloration, making them unsuitable for large, complex optical components like light guides and lens members, particularly in automotive applications.
Innovation Solution
An acrylic polymer with a lactone ring structure in the main chain and specific melt flow rate, combined with additives, to enhance heat resistance, melt formability, and suppress discoloration, maintaining transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a ring structure is introduced into acrylic polymers to improve heat resistance, then heat resistance is improved, but melt flowability deteriorates
Solution Approach 1:
The patent changes the chemical structure parameters by introducing a lactone ring structure at specific positions in the main chain of the acrylic polymer. This structural modification enables the polymer to achieve high heat resistance (glass transition temperature of 110°C or higher) while maintaining adequate melt flowability (MFR of 2 g/10 minutes or more at 230°C under 3.8 kg load), resolving the contradiction between heat resistance and processability.
2Temperature
If a ring structure is introduced into acrylic polymers to improve heat resistance, then heat resistance is improved, but discoloration tendency increases
Solution Approach 1:
The patent modifies the molecular structure by incorporating a lactone ring structure at specific positions in the main chain, which changes the thermal and optical stability parameters of the polymer. This structural change enables the material to maintain high heat resistance while suppressing discoloration during processing, as the lactone ring structure provides thermal stability without the yellowing issues associated with other ring structures.
3Temperature
If the proportion of ring structure is increased to further improve heat resistance, then heat resistance is improved, but melt flowability and moldability deteriorate
Solution Approach 1:
The patent applies the local quality principle by introducing the lactone ring structure at specific positions in the main chain rather than uniformly throughout the polymer. This localized structural modification allows the polymer to achieve the desired heat resistance (glass transition temperature of 110°C or higher) while maintaining adequate melt flowability (MFR of 2 g/10 minutes or more), thereby preserving moldability for complex optical components.
4Temperature
If the proportion of ring structure is increased to further improve heat resistance, then heat resistance is improved, but discoloration tendency increases
Solution Approach 1:
The patent introduces the lactone ring structure at specific positions in the main chain, creating localized regions of enhanced thermal stability. This localized modification allows the polymer to achieve high heat resistance even at higher ring structure proportions while the specific lactone ring structure suppresses discoloration during processing, unlike other ring structures that cause yellowing.
Data Source
AI summary
A novel acrylic polymer is provided. The novel acrylic polymer is an acrylic polymer which has a lactone ring structure in the main chain and has a melt flow rate of 2 g/10 minutes or more as measured at 230° C. under a load of 3.8 kg according to JIS K 7210.