Transparent Thermoplastic Resin Composition with Phosphite Stabilizer
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Solution Overview
Problem
Transparent thermoplastic resins, such as ABS, suffer from discoloration during long-term storage and high-temperature conditions, limiting their application in products requiring transparency and durability like transparent windows and appliance housings.
Innovation Solution
A transparent thermoplastic resin composition comprising rubber-reinforced thermoplastic resin polymerized from conjugated diene rubber, methacrylic acid alkyl ester or acrylic acid alkyl ester monomers, and aromatic vinyl monomers, combined with dihydrocarbyl pentaerythritol diphosphite, which maintains transparency and impact strength while preventing discoloration at elevated temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent thermoplastic resins are used for products requiring transparency, then transparency is achieved, but discoloration occurs during long-term storage and high-temperature conditions
Solution Approach 1:
A phosphite stabilizer is introduced as an intermediary substance to protect the transparent thermoplastic resin from discoloration during storage and high-temperature conditions. The stabilizer acts as a mediator between the resin and environmental factors causing degradation, preventing harmful reactions while maintaining transparency.
Solution Approach 2:
The invention creates a composite material system combining transparent thermoplastic resin with phosphite stabilizer and controlled rubber content. This composite approach integrates multiple components with complementary functions: the resin provides transparency, the stabilizer prevents degradation, and the rubber phase enhances impact resistance without compromising optical properties.
2Strength
If ABS resin is used for impact resistance, then impact strength is improved, but transparency is lost
Solution Approach 1:
The invention applies local quality by introducing rubber particles in specific controlled amounts (5-60% based on solid content) and with specific particle size distributions (600-5000 Å average diameter). The rubber is localized in discrete phases within the transparent resin matrix, providing impact resistance at specific locations without compromising the overall transparency of the material.
Solution Approach 2:
The invention changes critical parameters including rubber content (5-60%), particle diameter (600-5000 Å), and refractive index matching (difference of 0.02 or less between rubber and resin). By optimizing these parameters, the material achieves both impact resistance and transparency simultaneously, resolving the traditional trade-off between these properties.
3Illumination intensity
If transparent resins are used for transparency, then transparency is achieved, but impact strength and processability are reduced compared to ABS resins
Solution Approach 1:
The invention creates a composite material system combining transparent thermoplastic resin with phosphite stabilizer and controlled rubber content. This composite approach integrates multiple components with complementary functions: the resin provides transparency, the stabilizer prevents degradation, and the rubber phase enhances impact resistance without compromising optical properties.
4Strength
If rubber-reinforced thermoplastic transparent resin is used for impact strength, then impact resistance is improved, but discoloration occurs during storage
Solution Approach 1:
A phosphite stabilizer is introduced as an intermediary substance to protect the transparent thermoplastic resin from discoloration during storage and high-temperature conditions. The stabilizer acts as a mediator between the resin and environmental factors causing degradation, preventing harmful reactions while maintaining transparency.
Solution Approach 2:
The invention extracts and addresses the discoloration problem separately from the impact resistance function. By adding a dedicated phosphite stabilizer component, the solution isolates the stabilization function from the rubber reinforcement function, allowing each to optimize their respective roles without interfering with each other's performance.
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 composition achieves superior transparency, impact strength, and long-term storage stability, preventing discoloration during storage and high-temperature transportation, making it suitable for applications requiring transparency and durability.
Implementation Method 1
B) 0.01 to 3 parts by weight of dihydrocarbyl pentaerythritol diphosphite
Implementation Method 2
a difference between a refractive index of the conjugated diene rubber and a refractive index of a resin polymerized from the monomers other than the conjugated diene rubber may be, for example, 0.02 or less
Data Source
AI summary
Disclosed are a transparent thermoplastic resin composition and a molded article prepared therefrom. More particularly, disclosed are a transparent thermoplastic resin composition comprising A) 100 parts by weight of a rubber-reinforced thermoplastic transparent resin, and B) 0.01 to 2 parts by weight of a dihydrocarbyl pentaerythritol diphosphite wherein the A) rubber-reinforced thermoplastic transparent resin is prepared by polymerizing 5 to 60% by weight of a conjugated diene rubber, 20 to 70% by weight of a methacrylic acid alkyl ester monomer or an acrylic acid alkyl ester monomer, 8 to 50% by weight of an aromatic vinyl monomer and 0 to 20% by weight of a vinyl cyanide monomer, and a molded article prepared therefrom.