Toner Resin Composition for Fixing and Storage Stability
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Solution Overview
Problem
Traditional toners face issues with low-temperature fixability and high-temperature storage stability, particularly in high-temperature and high-humidity environments, leading to image defects such as filming and poor fixing performance.
Innovation Solution
A toner formulation containing a combination of polyester resin and styrene resin, with specific peak ratios (R1/W1 between 1.00 and 2.00 and R2/W2 between 0.80 and 1.20, as determined by FT-IR spectroscopy, which enhances low-temperature fixability and reduces filming, even in severe conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional toner formulations are used, then storage stability is maintained, but low-temperature fixability deteriorates and filming occurs in high-temperature environments
Solution Approach 1:
The patent changes the chemical composition parameters of the toner by incorporating a specific ratio of amorphous polyester resin (5-20 mass%) with controlled glass transition temperature (40-80°C) and molecular weight (20,000-100,000), along with crystalline polyester resin and styrene resin. This parameter optimization enables the toner to exhibit different thermal behaviors during storage versus fixing operations, achieving both low-temperature fixability and storage stability
Solution Approach 2:
The patent creates a composite toner material system combining four key components: amorphous polyester resin, crystalline polyester resin, styrene resin, and colorant. Each component serves a specific function - the amorphous polyester provides low-temperature fixability through its glass transition properties, the crystalline polyester ensures storage stability, and the styrene resin enhances overall performance. This composite structure resolves the contradiction by distributing functions across multiple materials
2Temperature
If amorphous polyester resin is added to improve low-temperature fixability, then fixing performance improves, but filming occurs in high-temperature and high-humidity environments
Solution Approach 1:
The patent carefully controls the glass transition temperature (40-80°C) and molecular weight (20,000-100,000) parameters of the amorphous polyester resin to optimize its thermal behavior. By limiting the content to 5-20 mass% and specifying the molecular weight range, the resin provides sufficient low-temperature fixability while its controlled physical properties prevent excessive softening and filming in high-temperature storage conditions
Solution Approach 2:
The patent assigns different functional qualities to different resin components: the amorphous polyester resin specifically provides low-temperature fixability through its glass transition properties, while the crystalline polyester resin provides high-temperature storage stability. This functional differentiation ensures that each component contributes its specific strength without causing harmful side effects like filming
3Use of energy by stationary object
If toner is designed for low-temperature fixing, then energy consumption is reduced, but image quality and storage stability deteriorate
Solution Approach 1:
The patent employs a composite resin system where amorphous polyester resin (providing low-temperature fixability), crystalline polyester resin (providing storage stability), and styrene resin (enhancing overall performance) work synergistically. This composite structure enables the toner to be fixed at lower temperatures while maintaining storage stability and image quality, as each component compensates for the limitations of the others
Solution Approach 2:
The patent optimizes multiple parameters simultaneously: the glass transition temperature of the amorphous polyester resin (40-80°C), its molecular weight (20,000-100,000), and its content ratio (5-20 mass%). These parameter optimizations ensure that the toner achieves adequate melting and flow at lower fixing temperatures while maintaining structural integrity and image quality through the complementary properties of the crystalline and styrene resins
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 toner exhibits excellent low-temperature fixability and high-temperature storage stability, preventing image defects like black streaks and poor fixing, while maintaining image quality in high-temperature and high-humidity environments.
Implementation Method 1
the peak ratio (R1/W1) is between 1.00 and 2.00, where R1 represents the maximum peak height in a range of 710 cm−1 to 690 cm−1 of a Fourier Transform Infrared Spectroscopy (FT-IR) spectrum of the toner measured by Attenuated Total Reflection (ATR) method
Data Source
AI summary
A toner contains a polyester resin and a styrene resin, wherein the peak ratio (R1/W1) is between 1.00 and 2.00, where R1 represents the maximum peak height in a range of 710 cm−1 to 690 cm−1 of a Fourier Transform Infrared Spectroscopy (FT-IR) spectrum of the toner measured by Attenuated Total Reflection (ATR) method, and W1 represents the maximum peak height in a range of 789 cm−1 to 852 cm−1 of the FT-IR spectrum of the toner measured by ATR method, and the peak ratio (R2/W2) is between 0.80 and 1.20, where R2 represents the maximum peak height in a range of 710 cm−1 to 690 cm−1 of an FT-IR spectrum of the toner measured by KBr tablet method, and W2 represents the maximum peak height in a range of 789 cm−1 to 852 cm−1 of the FT-IR spectrum of the toner measured by KBr tablet method.