Toner Composition Crystallization Inhibition via Amorphous Resin
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Solution Overview
Problem
Toners for developing electrostatic images face challenges in maintaining satisfactory fixing properties at low temperatures due to crystallization issues during storage and high-temperature environments, leading to under-offset and image quality problems.
Innovation Solution
A toner composition containing a crystalline resin and an amorphous vinyl resin component with specific structural units, which prevents crystallization by uniformly dispersing the crystalline resin and inhibiting regular arrangement of molecular chains, ensuring stable fixing properties through the use of an amorphous vinyl resin polymer with a predetermined range of structural units and a hybrid resin modified with styrene acrylic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a crystalline resin component is used to achieve low-temperature fixing properties, then fixing properties at low temperatures are improved, but the crystalline resin readily crystallizes during long-term storage or under high-temperature environment, causing impairment of fixing properties
Solution Approach 1:
The patent introduces an amorphous resin component as an intermediary substance between the crystalline resin particles. This amorphous resin has high affinity for the crystalline resin and prevents its crystallization during storage and high-temperature environments. The amorphous resin acts as a mediator that maintains the crystalline resin in a dispersed state, thereby preserving the low-temperature fixing properties while ensuring long-term reliability.
Solution Approach 2:
The patent creates a composite toner particle structure consisting of both crystalline resin and amorphous resin components. The crystalline resin provides low-temperature fixing properties through its thermal responsiveness, while the amorphous resin provides stability by preventing crystallization during storage. This composite material approach allows the toner to simultaneously achieve both low-temperature fixing capability and long-term storage stability.
2Reliability
If compatibility between crystalline resin and amorphous resin is increased to prevent crystallization, then storage stability is improved, but significantly high compatibility causes crystallization of the binder resin, leading to low density and fogging
Solution Approach 1:
The patent carefully controls the compatibility parameter between the crystalline and amorphous resins. By adjusting the chemical structure and composition of the amorphous resin, the patent achieves an optimal compatibility level that is high enough to prevent crystallization during storage but low enough to avoid inducing crystallization of the binder resin. This precise parameter control resolves the contradiction between storage stability and composition stability.
3Reliability
If crystallization is prevented during storage, then fixing properties are maintained, but insufficient prevention of crystallization causes under-offset indicating separation of toner from sheet
Solution Approach 1:
The patent applies preliminary anti-action by incorporating the amorphous resin component into the toner formulation before storage or use. This amorphous resin proactively prevents crystallization of the crystalline resin during storage and high-temperature environments, thereby preemptively avoiding the harmful effect of under-offset. The preventive measure ensures that the toner maintains its fixing properties consistently without separation from the sheet.
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 solution effectively prevents crystallization of the crystalline resin during storage and high-temperature conditions, ensuring the toner particles melt satisfactorily during fixing, maintaining superior fixing properties and image quality.
Implementation Method 1
prevents crystallization by uniformly dispersing the crystalline resin and inhibiting regular arrangement of molecular chains
Implementation Method 2
ensuring the toner particles melt satisfactorily during fixing
Data Source
AI summary
Provided is a toner for developing electrostatic images containing toner particles. The toner particles contain a crystalline resin and an amorphous resin. The amorphous resin contains an amorphous vinyl resin component containing a polymer of monomers having a structure represented by formula (1). The content of a structural unit derived from the monomers in the toner particles is within a range of 2.4 to 13.5 mass %.H2C═CR1—COOR2 (1)In formula (1), R1 represents a hydrogen atom or a methyl group and R2 represents a branched alkyl group having a carbon number of 8 or more.