Toner Formulation with Controlled Ester Wax for Low-Temperature Fixation
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Solution Overview
Problem
Existing toners face challenges in achieving low-temperature fixability and storage stability while prolonging service life, as they tend to deteriorate in high-temperature and high-humidity environments, leading to contamination of the carrier surface and poor image quality.
Innovation Solution
A toner formulation comprising toner particles with a coloring agent, amorphous polyester, crystalline polyester, and ester wax, along with inorganic oxide particles, specifically hydrophobic silica, is developed. The ester wax has a controlled carbon number distribution and intensity ratio, and the crystalline polyester has a targeted endothermic peak temperature, ensuring improved fixability and storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an ester wax with a small carbon number and sharp intensity ratio distribution is used, then low-temperature offset resistance is improved, but storage property deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the carbon number distribution of ester wax, specifically setting the ratio of C34 to C36 content to 3:7 or 4:6, and limiting C32 content to 5% or less. This optimized parameter configuration achieves both low-temperature offset resistance and improved storage stability compared to conventional esters with sharp intensity ratios.
Solution Approach 2:
The patent uses a composite material approach by combining ester wax with specific crystalline polyester resins (polyester A with Tg of -50°C to -30°C and polyester B with Tg of -40°C to -20°C) in controlled proportions. This composite formulation resolves the contradiction between low-temperature performance and storage stability by leveraging the complementary properties of each component.
2Stability of the object's composition
If an ester wax with a large carbon number and sharp intensity ratio distribution is used, then storage property is improved, but low-temperature offset resistance deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the carbon number distribution parameters of ester wax, specifically controlling C34 content at 30-70%, C36 content at 30-70%, and maintaining C32 content at 5% or less. This balanced parameter configuration prevents wax deposition while maintaining low-temperature offset resistance.
Solution Approach 2:
The patent combines ester wax with crystalline polyester resins having specific Tg ranges to create a composite material system. The polyester components with controlled glass transition temperatures compensate for the limitations of individual ester wax components, achieving both storage stability and low-temperature performance.
3Temperature
If the proportion of components having a small carbon number in the ester wax is increased, then low-temperature fixation is improved, but storage stability deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the carbon number distribution parameters, specifically limiting C32 content to 5% or less while optimizing C34 and C36 content ratios. This prevents excessive low-temperature fluidity that would compromise storage stability while maintaining adequate low-temperature fixation performance.
Solution Approach 2:
The patent applies local quality by creating different functional zones within the toner composition: the ester wax with controlled carbon distribution provides low-temperature fixation at the toner surface, while the crystalline polyester resin matrix provides storage stability throughout the toner particle structure.
4Temperature
If the proportion of components having a small carbon number in the ester wax is increased, then low-temperature fixation is improved, but fluidity deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the carbon number distribution parameters, specifically controlling C34 to C36 ratio at 3:7 or 4:6 and limiting C32 content. This balanced parameter configuration maintains adequate fluidity for high-speed machine operation while achieving low-temperature fixation.
Solution Approach 2:
The patent combines ester wax with crystalline polyester resins to create a composite material where the polyester component compensates for fluidity deficiencies. The composite system maintains proper toner flow characteristics for high-speed operation while the ester wax component provides low-temperature fixation capability.
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 achieves enhanced low-temperature fixability, storage stability, and extended service life by preventing wax deposition and maintaining chargeability, thus improving image quality and reducing contamination.
Implementation Method 1
a crystalline polyester having an endothermic peak temperature of T2 as measured by a differential scanning calorimeter
Implementation Method 2
an ester wax having an endothermic peak temperature of T1 as measured by a differential scanning calorimeter
Implementation Method 3
inorganic oxide particles, specifically hydrophobic silica
Data Source
AI summary
A developer having low-temperature fixability and storage stability, and capable of prolonging the service life is provided. A toner includes a coloring agent, an amorphous polyester, a crystal line polyester, ester wax containing multiple ester compounds, each having a carbon number selected from 32 to 54, and hydrophobic silica having an average primary particle diameter of 8 to 35 nm. When the ion intensity ratio of each ester compound having a different carbon number is expressed as percentage, the content (a) of the ester compound having a carbon number of (Cn) showing the maximum intensity ratio is from 20 to 55% by weight of the entire ester wax, the sum (g) of the content (e) of the ester compound having a carbon number of (Cn+2) and the content (f) of the ester compound having a carbon number of (Cn+4) satisfies the following formula: 0.065≤g/a≤0.200.