Aromatic Polycarbonate Copolymer Fluidity Modifier
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Solution Overview
Problem
Current methods for improving the fluidity of thermoplastic resins, such as polycarbonate resins, fail to achieve a balance between fluidity and maintaining high mechanical strength and transparency, leading to deterioration of physical properties like heat resistance and impact resistance.
Innovation Solution
Incorporating an aromatic polycarbonate copolymer with specific carbonate structural units, which modulates the melt viscosity and polymer chain entanglement, enhancing fluidity without compromising mechanical and thermal properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the molecular weight of the thermoplastic resin is decreased to decrease melt viscosity, then the fluidity and moldability are improved, but the mechanical properties, thermal properties, and optical properties deteriorate
Solution Approach 1:
The patent changes the chemical structure parameters of the resin by introducing specific carbonate structural units (Formula 1 and Formula 2) with controlled ratios. This modifies the polymer chain architecture and intermolecular forces, thereby improving fluidity through enhanced molecular mobility while preserving mechanical strength through maintained chain entanglement and cross-linking characteristics.
Solution Approach 2:
The patent creates a composite resin system by combining multiple carbonate structural units (Formula 1 with R1-R6 groups and Formula 2 with aromatic rings) within a single polymer matrix. This composite structure leverages the low-viscosity characteristics of certain units while the aromatic units provide structural integrity, achieving both improved moldability and preserved mechanical properties.
2Ease of manufacture
If the molecular weight of the thermoplastic resin is decreased to decrease melt viscosity, then the fluidity and moldability are improved, but the thermal properties and optical properties deteriorate
Solution Approach 1:
The patent modifies the thermal properties by introducing aromatic rings in Formula 2 units, which have high thermal stability and glass transition temperatures. These aromatic units act as thermal anchors within the polymer matrix, maintaining high-temperature structural integrity while the aliphatic R1-R6 groups in Formula 1 units provide low-viscosity melt characteristics for improved moldability.
3Ease of manufacture
If the molecular weight of the thermoplastic resin is decreased to decrease melt viscosity, then the fluidity and moldability are improved, but the transparency and optical properties deteriorate
Solution Approach 1:
The patent maintains optical clarity by using transparent aromatic rings and aliphatic chains in the carbonate structural units. The specific R1-R6 groups in Formula 1 and the aromatic structures in Formula 2 are selected for their optical transparency, ensuring that the polymer matrix remains clear while the modified molecular architecture provides improved fluidity for moldability.
4Ease of manufacture
If conventional methods are used to improve fluidity of polycarbonate resins (alloying with styrene-based resins, polyester resins, acrylic resins, or phenolic resins), then the fluidity is improved, but the transparency, heat resistance, impact resistance, and fire retardancy deteriorate
Solution Approach 1:
The patent improves fluidity by modifying the internal structure of polycarbonate itself through the introduction of specific carbonate units (Formula 1 and Formula 2) rather than alloying with incompatible resins. This maintains the inherent heat resistance and impact resistance of polycarbonate while the controlled introduction of flexible R1-R6 groups and aromatic units enhances melt flow characteristics.
Solution Approach 2:
The patent creates a homogeneous composite structure within the polycarbonate matrix by incorporating multiple carbonate structural units (Formula 1 with aliphatic groups and Formula 2 with aromatic groups) in controlled ratios. This internal composite structure provides both the flexibility needed for improved fluidity and the structural integrity to maintain heat resistance and impact resistance, avoiding the need for external alloying materials that compromise properties.
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 aromatic polycarbonate copolymer composition achieves improved moldability and retention of mechanical strength, thermal stability, and transparency in thermoplastic resin compositions, suitable for applications in optical and electronic devices.
Implementation Method 1
Incorporating an aromatic polycarbonate copolymer with specific carbonate structural units, which modulates the melt viscosity and polymer chain entanglement, enhancing fluidity without compromising mechanical and thermal properties
Data Source
AI summary
An object of the present invention is to provide a fluidity modifier whose inclusion in a transparent amorphous thermoplastic resin represented by a polycarbonate resin enables improvement of the fluidity without deteriorating the original favorable physical properties of the thermoplastic resin, and a thermoplastic resin composition containing it. This object is achieved by a fluidity modifier for thermoplastic resin, which fluidity modifier includes an aromatic polycarbonate copolymer containing a carbonate structural unit (A) represented by Formula (1) and a carbonate structural unit (B) represented by Formula (2), wherein the ratio of the carbonate structural unit (A) to a total of 100 mol% of the carbonate structural unit (A) and the carbonate structural unit (B) is more than 10 mol% and not more than 36.5 mol%.