Polycarbonate-Modified Methacrylate Resin Composition for Scratch and Flame Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional polycarbonate resin compositions lack adequate scratch-resistance and flame retardancy, and blends with polymethyl methacrylate suffer from compatibility issues, refractive index differences, and visible weld lines, limiting their suitability for electronic and electric goods.
Innovation Solution
A modified methacrylate resin copolymerized with methyl methacrylate and a difunctional monomer is blended with polycarbonate resin, along with a flame retardant and impact modifier, to enhance compatibility, reduce refractive index differences, and improve scratch-resistance and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polycarbonate resin is used to achieve good mechanical strength and flame retardancy, then flame retardancy and mechanical strength are improved, but scratch-resistance deteriorates
Solution Approach 1:
The patent creates a composite resin composition by blending polycarbonate resin with modified methacrylate resin. This composite material combines the flame retardancy and mechanical strength of polycarbonate with the scratch-resistance of methacrylate, achieving all three properties simultaneously without requiring separate materials for each function.
Solution Approach 2:
The patent modifies the methacrylate resin by copolymerizing it with difunctional monomers to change its chemical structure and properties. This parameter change in the resin composition allows for improved compatibility with polycarbonate and better integration of properties, resolving the contradiction between scratch-resistance and flame retardancy.
2Strength
If polycarbonate resin is blended with polymethyl methacrylate to improve scratch-resistance, then scratch-resistance is improved, but compatibility deteriorates causing phase separation
Solution Approach 1:
The patent changes the chemical parameters of the methacrylate resin by copolymerizing it with difunctional monomers. This modification alters the resin's molecular structure and compatibility characteristics, enabling better mixing with polycarbonate resin and preventing phase separation during processing.
Solution Approach 2:
The modified methacrylate resin acts as an intermediary material that bridges polycarbonate and methacrylate components. By modifying the methacrylate with difunctional monomers, it creates a compatible interface between the two resins, allowing them to blend uniformly without phase separation.
3Strength
If polycarbonate resin is blended with PMMA to achieve scratch-resistance, then scratch-resistance is improved, but appearance deteriorates due to visible weld lines
Solution Approach 1:
The patent modifies the refractive index parameter of the methacrylate resin through copolymerization with difunctional monomers. This parameter change brings the refractive index closer to that of polycarbonate, reducing light scattering and eliminating visible weld lines while maintaining scratch-resistance.
4Reliability
If conventional flame retardants are used with PMMA to achieve flame retardancy, then flame retardancy is improved, but scratch-resistance deteriorates
Solution Approach 1:
The patent creates a composite system where the modified methacrylate resin serves dual functions: providing scratch-resistance through its inherent properties and enabling flame retardancy through compatibility with flame retardant additives. This resolves the contradiction by integrating multiple functions into a single modified resin component.
Data Source
AI summary
Disclosed herein is a scratch resistant flame retardant thermoplastic resin composition comprising: 100 parts by weight of a base resin comprising (A) about 1 to about 99% by weight of a polycarbonate resin and (B) about 99 to about 1% by weight of a modified methacrylate resin; and (C) about 1 to about 50 parts by weight of a flame retardant.