Resin Particle Adhesion via Titanium Catalyst Polyester
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Solution Overview
Problem
Resin particles used in applications involving thermally melting tend to have low affinity to objects like metal, paper, or wood, leading to poor adhesiveness and potential peeling or offset issues during low-temperature fixation.
Innovation Solution
Producing resin particles using a specific esterification catalyst, specifically a titanium catalyst, to form polyester resins that enhance adhesion by creating a structure where resin particles are adhered to the surface of other resin particles, resulting in improved adhesiveness and uniform particle diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional resin particles are used for thermal melting applications, then the resin particles can be easily melted and adhered to objects, but their affinity to the object is low leading to poor adhesiveness
Solution Approach 1:
The patent employs composite resin particles consisting of a core resin (a) and a shell resin (b) with different glass transition temperatures. The core resin provides structural integrity while the shell resin enhances adhesion to substrates. This composite structure resolves the contradiction by combining materials with complementary properties to achieve both ease of melting and high adhesiveness.
Solution Approach 2:
The patent applies local quality by creating a core-shell structure where different regions of the particle have different properties. The core region contains resin (a) with specific Tg for structural stability, while the shell region contains resin (b) with different Tg for enhanced adhesion. This spatial differentiation of material properties allows the particle to exhibit both easy melting and high affinity to objects simultaneously.
2Reliability
If resin particles are made with high adhesiveness through thermal melting, then they adhere firmly to objects, but their particle diameter uniformity decreases
Solution Approach 1:
The patent uses preliminary action by pre-forming resin particles (a) with controlled size and morphology before coating them with resin (b). This preliminary preparation ensures uniform particle diameter is established early in the process, and the subsequent shell coating does not disrupt this uniformity. The core particles are prepared with precise size control, and the shell material is deposited uniformly around each core, maintaining diameter consistency while enhancing adhesion.
3Reliability
If a core-shell structure is formed with resin particles (A) adhered on resin particles (B), then adhesion is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent employs an intermediary approach by using a dispersion medium and surface treatment agents to facilitate the coating process. The core resin particles are dispersed in a suitable medium, and the shell resin is applied through a controlled coating process that uses chemical or physical intermediaries to ensure uniform adhesion. This intermediary mechanism simplifies the overall process by providing a straightforward pathway to form the core-shell structure without requiring complex multi-step operations.
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 method allows for the production of resin particles with high affinity to objects, ensuring good adhesiveness and preventing peeling or offset, while also achieving stable and uniform particle dispersion.
Implementation Method 1
at least one of the resin (a) and the resin (b) contains a polyester resin (p1) formed in the presence of a titanium catalyst (t) represented by the following general formula (I)
Data Source
AI summary
The present invention concerns a method for producing an aqueous dispersion (X1), the method including a step that includes mixing an aqueous dispersion liquid (W) of resin particles (A) comprising a resin (a) with a precursor (b0) of a resin (b) or an oily liquid (OL) comprising the precursor (b0) and an organic solvent to disperse the precursor (b0) or the oily liquid (OL) in the aqueous dispersion liquid (W), followed by causing the precursor (b0) to react in the aqueous dispersion liquid (W) to form resin particles (B) comprising the resin (b), thereby obtaining the aqueous dispersion (X1) of resin particles (C) having a structure where resin particles (A) are adhered on the surface of the resin particles (B), wherein at least one of the resin (a) and the resin (b) contains a polyester resin (p1) formed in the presence of a specific titanium catalyst (t) or a resin (p2) having the polyester resin (p1) as a constituent unit.