Methacrylate Film with Phenoxy Resin for Low Phase Difference
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Solution Overview
Problem
Current methacrylate resin compositions for polarizer protective films face challenges in achieving high transparency, heat resistance, and small phase differences when stretched, often resulting in decreased quality due to increased moisture permeability and adhesive strength issues.
Innovation Solution
A methacrylate resin composition combining a methacrylate resin with high triad syndiotacticity and a phenoxy resin, along with a polycarbonate resin, where the phenoxy resin content is between 0.1 to 8 parts by mass per 100 parts of methacrylate resin, and the total content of methacrylate and phenoxy resins is over 80 mass%, ensuring high molecular weights and specific structural unit ratios for enhanced properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a methacrylate resin film is stretched to enhance toughness, then strength is improved, but phase difference increases causing screen quality degradation
Solution Approach 1:
The patent uses a composite material system consisting of modified methacrylate resin and phenoxy resin. The phenoxy resin content is controlled at 5-50 parts by mass per 100 parts of modified methacrylate resin. This composite structure allows the film to maintain small phase differences when stretched, while still achieving the necessary toughness for polarizer protective films.
2Manufacturing precision
If modified methacrylate resin is used to reduce phase difference, then phase difference is reduced, but strength decreases causing film cracking
Solution Approach 1:
The patent combines modified methacrylate resin with phenoxy resin to create a composite material that maintains high strength while achieving small phase differences. The specific composition ratio (phenoxy resin 5-50 parts by mass per 100 parts of modified methacrylate resin) ensures both mechanical strength and optical properties are optimized, preventing film cracking.
Solution Approach 2:
The patent modifies the methacrylate resin by copolymerizing with aromatic vinyl monomers or imide monomers to introduce rigid structures that reduce phase differences. The content of rigid structural units is controlled at 1-50 mol% to balance phase difference reduction with maintaining sufficient strength.
3Length of moving object
If film thickness is reduced to achieve thinner display devices, then device thickness is reduced, but moisture permeability increases causing polarizer quality degradation
Solution Approach 1:
The patent uses a composite of modified methacrylate resin and phenoxy resin that provides both mechanical strength and moisture barrier properties. This allows the film to be made thinner while maintaining low moisture permeability, protecting the polarizer from moisture damage even at reduced thickness.
Data Source
Figure 1~2
AI summary
A methacrylate resin composition containing a methacrylate resin and a phenoxy resin and a film consisting of the same, each having high transparency, small phase differences in a thickness direction, low heat shrinkage rate, high strength and good adhesion properties are provided. The methacrylate resin composition contains a methacrylate resin with a triad syndiotacticity (rr) of equal to or more than 58% and a phenoxy resin, and the content of the phenoxy resin per 100 parts by mass of the methacrylate resin is in a range of 0.1 to 8 parts by mass, and the total content of the methacrylate resin and phenoxy resin is 80 mass% or more.