Methacrylic Polymer Copolymer for Solution Casting Film Production
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Solution Overview
Problem
The existing method for producing resin films using polymethylmethacrylate resin in solution casting is inefficient due to slow solvent evaporation, leading to reduced film production efficiency.
Innovation Solution
A methacrylic polymer is developed through copolymerization of methyl methacrylate with specific comonomers, such as N-substituted maleimide and methacrylic ester units, to enhance solvent evaporation rates and maintain excellent heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If polymethylmethacrylate resin is used in solution casting, then the resin film can be produced with excellent transparency and appearance, but the solvent evaporation rate is slow which reduces film production efficiency
Solution Approach 1:
The patent changes the chemical composition parameters of the methacrylic polymer by introducing specific comonomer units (carboxyl-containing, hydroxyl-containing, or amino-containing units) to modify the polymer's interaction with solvents. This compositional change accelerates solvent evaporation rate while preserving the excellent transparency and appearance characteristics of methacrylic polymer films, thereby resolving the contradiction between production efficiency and evaporation time.
Solution Approach 2:
The patent creates a composite methacrylic polymer structure by copolymerizing methyl methacrylate with functional comonomers containing carboxyl, hydroxyl, or amino groups. This composite polymer structure combines the optical benefits of pure polymethylmethacrylate with the enhanced solvent interaction properties of the functional comonomer units, enabling faster evaporation without sacrificing film quality.
2Reliability
If the glass transition temperature of the methacrylic polymer is increased to 110°C or higher for excellent heat resistance, then heat resistance is improved, but the processing difficulty may increase
Solution Approach 1:
The patent precisely controls the glass transition temperature parameter by adjusting the types and proportions of functional comonomer units in the copolymer structure. By optimizing these compositional parameters, the patent achieves Tg ≥ 110°C for excellent heat resistance while maintaining processability through solution casting, effectively balancing heat resistance requirements with manufacturing ease.
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 methacrylic polymer composition allows for high evaporation rates of solvents during solution casting, improving film production efficiency and achieving resin films with excellent heat resistance.
Implementation Method 1
the solvent is evaporated from the cast layer
Implementation Method 2
the methacrylic polymer (a) being a copolymer including a methyl methacrylate unit and at least one drying-accelerating comonomer unit, the methacrylic polymer (a) having a glass transition temperature of 110° C. or higher
Data Source
AI summary
Provided is a resin composition for use in producing a resin film by solution casting, the resin composition including a methacrylic polymer that has excellent heat resistance and that allows for a high evaporation rate of a solvent when the solvent is evaporated from a cast layer in solution casting. The resin composition for use in film production by solution casting includes a methacrylic polymer (a), and the methacrylic polymer (a) is a copolymer including a methyl methacrylate unit and at least one drying-accelerating comonomer unit and has a glass transition temperature of 110° C. or higher. The drying-accelerating comonomer unit is preferably selected from the group consisting of: an N-substituted maleimide monomer unit; a methacrylic ester unit containing an ester moiety in the form of a primary, secondary, or aromatic hydrocarbon group having 2 to 8 carbon atoms; a methacrylic ester unit containing an ester moiety in the form of a saturated hydrocarbon group having a fused ring structure and having 7 to 16 carbon atoms; a methacrylic ester unit containing an ester moiety in the form of a linear or branched group containing an ether bond; and a styrenic monomer unit.