Thin-Wall Protective Housing Composite for Optical Clarity and Impact
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Solution Overview
Problem
Current materials for protective housings of electronic devices, such as thermoplastic elastomeric (TPE) and polycarbonate (PC)/acrylonitrile-butadiene-styrene (ABS), fail to meet the requirements of clear, low color, and high impact/ductility for thin-walled applications, particularly for portable electronic devices where optical clarity and 100% ductility at room temperature are necessary.
Innovation Solution
A thermoplastic composition comprising a poly(aliphatic ester)-polycarbonate copolymer with soft block ester units and carbonate units, combined with a heat stabilizer and epoxy resin, which exhibits high melt flow rates and 100% ductility at room temperature, allowing for the production of thin-wall articles like touch screens and protective housings with high optical clarity and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If TPE or PC/ABS materials are used for protective housings, then impact protection is provided, but optical clarity and low color requirements are not met due to inherent opacity
Solution Approach 1:
The patent uses a multi-layer composite structure combining TPE (for impact protection) with clear thermoplastic materials like polycarbonate or acrylic (for optical clarity). This composite approach allows each layer to fulfill its specific function - the TPE layer provides ductility and impact resistance while the clear thermoplastic layer provides optical transparency and low color appearance.
2Illumination intensity
If clear thermoplastics such as acrylic or polystyrene are used, then optical clarity is achieved, but impact/ductility requirements (100% ductility at room temperature) are not met
Solution Approach 1:
The patent creates a composite housing where clear thermoplastic materials (acrylic, polycarbonate, or clear ABS) are combined with TPE material. The clear thermoplastic provides the necessary optical clarity and low color properties, while the TPE component provides the required 100% ductility at room temperature and impact protection.
Solution Approach 2:
The patent applies different material properties to different regions or layers of the housing. The outer visible surfaces use clear thermoplastic for optical clarity, while impact-prone areas incorporate TPE for ductility and shock absorption. This local differentiation allows each region to have the specific properties it needs.
3Strength
If multi-shot combination of TPE and PC/ABS is used, then impact protection and ductility are improved, but optical clarity and low color requirements are not met
Solution Approach 1:
The patent replaces the PC/ABS component in the multi-shot combination with clear thermoplastic materials such as polycarbonate, acrylic, or clear ABS. This substitution maintains the multi-layer composite structure and impact protection benefits while eliminating the opacity issue associated with PC/ABS, thereby achieving both impact resistance and optical clarity.
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 thermoplastic composition enables the creation of thin-wall electronic device components with high optical clarity, low color, and excellent impact resistance, meeting the demands for clear, durable, and functional protective housings for portable electronics.
Implementation Method 1
Injection molded cases are currently made from thermoplastic elastomeric (TPE) material... extremely high flow polycarbonate copolymer based materials are desired... Melt Flow Rate (MFR) of from 40 g/10 minutes to 150 g/10 minutes
Implementation Method 2
extremely high flow polycarbonate copolymer based materials are desired... Melt Flow Rate (MFR) of from 40 g/10 minutes to 150 g/10 minutes... poly(aliphatic ester)-polycarbonate copolymer comprising soft block ester units and carbonate units
Data Source
AI summary
Provided herein are high flow and ductile thermoplastic resin compositions for the formation of thin wall articles and articles with desirable impact strengths. These compositions are useful in the manufacture of various shaped, formed and/or molded articles.