Toner Binder Resin Low Temperature Fixing Storage Stability
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Solution Overview
Problem
Existing toner binder resins fail to achieve a balance between low temperature fixing properties, offset resistance, and storage stability, often resulting in either poor fixing performance at lower temperatures or instability during storage.
Innovation Solution
A binder resin composition comprising a vinyl resin, a non-crystalline polyester resin, a saturated crystalline polyester resin, and a metal component, where the vinyl resin is composed of carboxyl group-containing and glycidyl group-containing components, and the non-crystalline polyester resin is dispersed in an island form within the vinyl resin, with the saturated crystalline polyester resin contained in the island phase, and the metal component is incorporated in the saturated crystalline polyester resin, optimizing the ester group concentration and acid value for improved compatibility and crystallization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If crystalline polyester is added to base resin to improve low temperature fixing properties, then low temperature fixing performance is enhanced, but crystalline polyester detaches easily causing blocking and poor storage stability
Solution Approach 1:
A non-crystalline polyester resin is introduced as an intermediary substance between the crystalline polyester and the base resin. The non-crystalline polyester resin wraps around crystalline polyester particles, preventing their detachment while maintaining the low temperature fixing properties provided by the crystalline structure.
Solution Approach 2:
The invention creates a composite resin system consisting of base resin, crystalline polyester resin, and non-crystalline polyester resin. This multi-component composite structure combines the advantages of each component: the base resin provides structural integrity, the crystalline polyester provides low temperature fixing capability, and the non-crystalline polyester provides dispersion and anti-detachment functionality.
2Temperature
If crystalline polyester resin is chemically combined with base resin to improve low temperature fixing properties, then low temperature fixing performance is enhanced, but crystallinity of crystalline polyester is reduced causing poor storage stability
Solution Approach 1:
The invention extracts the crystalline polyester from the chemical combination approach and instead uses physical dispersion. The crystalline polyester is kept as separate particles within the resin matrix, wrapped by non-crystalline polyester, thereby maintaining its crystalline structure and avoiding the loss of crystallinity that occurs with chemical combination.
Solution Approach 2:
The non-crystalline polyester resin is locally distributed around crystalline polyester particles, creating a protective micro-environment that maintains the crystallinity of the polyester while allowing the overall resin system to achieve good low temperature fixing properties.
3Adaptability or versatility
If non-crystalline polyester is added to control crystallinity, then compatibility is improved, but degree of crystallinity of crystalline polyester cannot be sufficiently increased resulting in poor storage stability
Solution Approach 1:
The invention optimizes specific parameters including the molecular weight, functional group content, and ratio of non-crystalline polyester to crystalline polyester. By carefully controlling these parameters, the system achieves both good compatibility and sufficient crystallinity, resolving the contradiction between compatibility and storage stability.
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 provides a toner with enhanced low temperature fixing properties, improved offset resistance, and superior storage stability by controlling the crystallization and dispersion of the polyester resins, reducing the likelihood of detachment and stickiness, thereby enhancing the overall performance and durability of the toner.
Implementation Method 1
the non-crystalline polyester resin is dispersed in an island form in the vinyl resin
Implementation Method 2
the saturated crystalline polyester resin is contained in the island phase of the non-crystalline polyester resin
Data Source
AI summary
Disclosed is a binder resin for a toner containing a vinyl resin (A), a non-crystalline polyester resin (SN) and a saturated crystalline polyester resin (SC), in which the content of the vinyl resin (A) is equal to or more than 65 mass % and equal to or less than 95 mass %, based on the total content of 100 mass % of the vinyl resin (A), the non-crystalline polyester resin (SN) and the saturated crystalline polyester resin (SC), the vinyl resin (A) is composed of a carboxyl group-containing vinyl resin (C), a glycidyl group-containing vinyl resin (E) and a reaction product of the vinyl resins, the ester group concentration of the saturated crystalline polyester resin (SC) is equal to or more than 10.0 mmol/g and equal to or less than 13.5 mmol/g, the non-crystalline polyester resin (SN) is dispersed in an island form in the vinyl resin (A) and the saturated crystalline polyester resin (SC) is contained in the island phase of the non-crystalline polyester resin (SN), and the metal component (M) containing at least one kind selected from the group consisting of Zn, Ca, Mg, Al and Ba (however, excluding metal oxide) is contained at least in the saturated crystalline polyester resin (SC).