Fluidity-Improving Agent for Aromatic Polycarbonate Resin
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Solution Overview
Problem
Aromatic polycarbonate resins have high molding process temperatures and poor melt fluidity, making it difficult to improve their shapeability without compromising transparency, thermal resistance, impact resistance, and chemical resistance.
Innovation Solution
A fluidity-improving agent comprising polymers with specific functional groups, such as epoxy and carboxyl groups, is used to enhance the melt fluidity of aromatic polycarbonate resins during shaping, achieved by reacting these polymers with the resin, thereby maintaining the intrinsic properties of transparency, thermal resistance, and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If aromatic polycarbonate resin is used for shaping, then mechanical strength, thermal resistance, and chemical resistance are improved, but melt fluidity deteriorates due to high molding process temperatures
Solution Approach 1:
A fluidity-improving agent comprising a copolymer with specific functional groups (carboxyl, hydroxyl, or amino groups) acts as an intermediary substance between the aromatic polycarbonate resin and the molding process. This copolymer reacts with the polycarbonate resin during melt-kneading to form a modified resin composition that exhibits improved melt fluidity while preserving the original resin's excellent mechanical strength, thermal resistance, and chemical resistance properties.
Solution Approach 2:
The invention changes the chemical parameters of the aromatic polycarbonate resin by introducing functional groups through the copolymer additive. The copolymer contains carboxyl, hydroxyl, or amino groups that react with the polycarbonate resin during processing, modifying the resin's melt flow characteristics without fundamentally altering its molecular structure or sacrificing its inherent high-performance properties.
2Ease of manufacture
If copolymer with high reactivity functional group is compounded to improve fluidity, then melt fluidity is improved, but transparency and impact resistance deteriorate due to deterioration during melt-kneading
Solution Approach 1:
The invention carefully controls the parameter of functional group reactivity by selecting specific types of functional groups (carboxyl, hydroxyl, or amino groups) with moderate reactivity toward aromatic polycarbonate resin. This controlled reactivity allows sufficient interaction to improve melt fluidity while preventing excessive reaction that would cause deterioration during melt-kneading, thereby maintaining transparency and impact resistance.
Solution Approach 2:
The copolymer is designed with a specific composition where only a portion of the polymer chains contain reactive functional groups, while the rest maintains compatibility with the polycarbonate resin. This local quality approach ensures that the functional groups provide the necessary fluidity improvement without causing widespread deterioration throughout the resin matrix during processing.
3Ease of manufacture
If copolymer is compounded to improve fluidity, then fluidity at shaping is improved, but transparency of shaped article is lowered
Solution Approach 1:
The copolymer with specific functional groups serves as an intermediary that modifies the interaction between polymer chains during melting and flow, improving fluidity. The functional groups (carboxyl, hydroxyl, or amino) interact with the aromatic polycarbonate resin in a controlled manner that does not create phase separation or crystallization, thereby maintaining the transparency of the final shaped article.
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 solution effectively improves the fluidity of aromatic polycarbonate resins during shaping without deteriorating their transparency, thermal resistance, impact resistance, and chemical resistance, enabling the production of high-quality shaped articles for various applications like hard coated articles, glazing materials, and light diffusing plates.
Implementation Method 1
a polymer having a functional group (X) and a polymer having a functional group (Y) capable of reacting with the functional group (X) as a fluidity-improving agent and by melt-kneading the fluidity-improving agent with the aromatic polycarbonate resin
Data Source
AI summary
A fluidity-improving agent containing 0.5 to 99.5 parts by mass of a polymer (A) which is obtained by polymerizing a monomer mixture (a) containing 0.5 to 99% by mass of (a1) an aromatic vinyl monomer, 0.5 to 99% by mass of (a2) a phenyl(meth)acrylate or a phenyl(meth)acrylate containing a substituent in a phenyl group, and 0.5 to 5% by mass of (a3) a vinyl monomer including a functional group (X), and 0.5 to 99.5 parts by mass of a polymer (B) which is obtained by polymerizing a monomer mixture (b) containing (b1) a phenyl(meth)acrylate or a phenyl(meth)acrylate containing a substituent in a phenyl group with a compound including a functional group (Y) reactive with the functional group (X), where the total of the polymer (A) and the polymer (B) is 100 parts by mass.