Polycarbonate Resin Composition for ID Card Durability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional resin compositions for cards, such as PVC and PET-G, lack sufficient mechanical strength and heat resistance, and polyester resin compositions exhibit poor transparency and reduced print resolution.
Innovation Solution
A resin composition containing 2-9% aliphatic polyester compound and 90% or more polycarbonate resin, with a glass transition temperature of 100-135°C, incorporating a white pigment and laser color former, specifically using ε-polycaprolactone and metal oxide-based laser color former for enhanced durability, heat resistance, and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyester resin composition is used to improve heat resistance and impact resistance, then mechanical strength is improved, but transparency deteriorates and print resolution is reduced
Solution Approach 1:
The patent changes the chemical composition parameters by using polycarbonate resin as the base material instead of polyester resin, and precisely controls the content of aliphatic polyester compound to 2-9% by mass. This parameter optimization maintains mechanical strength while preserving transparency and print resolution, resolving the contradiction between strength improvement and transparency maintenance.
2Ease of manufacture
If conventional resins like PVC or PET-G are used, then ease of processing is maintained, but durability and heat resistance are insufficient
Solution Approach 1:
The patent creates a composite resin composition by combining polycarbonate resin (90% or more) with aliphatic polyester compound (2-9%). This composite structure leverages the high durability and heat resistance of polycarbonate while incorporating the processing advantages of polyester compounds, achieving both reliability and ease of manufacture simultaneously.
3Reliability
If polycarbonate resin composition is used to improve durability and heat resistance, then mechanical properties are enhanced, but processing difficulty increases
Solution Approach 1:
The patent optimizes the compositional parameters by limiting aliphatic polyester compound content to 2-9% by mass and controlling glass transition temperature to 100-135°C. These parameter changes modify the processing characteristics of polycarbonate resin, making it easier to process while maintaining high durability and heat resistance.
4Manufacturing precision
If white pigment is added to improve opacity and printability, then transparency is reduced, but print resolution is improved
Solution Approach 1:
The patent optimizes the white pigment content parameter to 10-30% by mass based on the total resin composition. This precise parameter control ensures sufficient print resolution and opacity while minimizing the impact on transparency, achieving optimal balance for card manufacturing applications.
Data Source
Figure 1
AI summary
The present invention provides a resin composition, which contains: 2% by mass or more but less than 9% by mass of an aliphatic polyester compound; and a polycarbonate resin, wherein the resin composition further contains a white pigment in an amount of 10 to 30% by mass based on the mass of the whole resin composition.