Crystalline Polyester Toner With Boric Acid to Resist Hot Offset
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Solution Overview
Problem
Existing toners with high crystalline polyester resin content suffer from hot offset and non-uniformity of penetration into recording materials due to excessive melting, compromising low-temperature fixability and storage stability.
Innovation Solution
A toner formulation with controlled contents of amorphous resin, crystalline polyester resin, and boric acid, where the crystalline polyester resin is 30.00 to 80.00 mass% and boric acid is 0.10 to 10.00 mass%, facilitating hydrogen bonding and suppressing excessive melting, thereby improving low-temperature fixability and reducing hot offset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the content of crystalline polyester resin is increased to improve low-temperature fixability, then low-temperature fixability is improved, but hot offset occurs and storage stability deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the content of crystalline polyester resin within 30.00 to 80.00 mass% and boric acid within 0.10 to 10.00 mass%. This quantitative parameter optimization resolves the contradiction by finding the optimal balance point where low-temperature fixability is sufficient while preventing excessive melting that causes hot offset and storage instability.
Solution Approach 2:
The patent uses composite materials by combining crystalline polyester resin with amorphous resin and boric acid in specific ratios. The amorphous resin provides stability while the crystalline polyester resin provides sharp melt properties, and boric acid enhances low-temperature fixability. This composite approach allows the system to achieve both low-temperature fixability and storage stability simultaneously.
2Temperature
If the content of crystalline polyester resin is increased to improve low-temperature fixability, then low-temperature fixability is improved, but non-uniformity of penetration into recording material occurs
Solution Approach 1:
The patent applies parameter changes by optimizing the crystalline polyester resin content to 30.00-80.00 mass%, preventing excessive crystallinity that would cause non-uniform melting and penetration. This parameter control ensures uniform gloss distribution while maintaining low-temperature fixability.
Solution Approach 2:
The patent applies local quality by creating a core-shell structure where the core contains crystalline polyester resin for sharp melt properties and the shell contains amorphous resin for uniform penetration and gloss. This spatial differentiation allows each region to perform its specific function optimally.
3Temperature
If boric acid is added to enhance low-temperature fixability, then low-temperature fixability is improved, but excessive melting occurs leading to hot offset
Solution Approach 1:
The patent applies parameter changes by precisely controlling boric acid content within 0.10 to 10.00 mass%. This quantitative control ensures that boric acid provides sufficient low-temperature fixability enhancement while preventing excessive melting that would cause hot offset. The patent also specifies the ratio of boric acid to crystalline polyester resin to optimize the effect.
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 excellent low-temperature fixability, suppresses non-uniformity of penetration, and enhances heat-resistant storage stability by balancing the content of crystalline polyester resin and boric acid, thereby improving hot offset resistance and gloss uniformity.
Implementation Method 1
facilitating hydrogen bonding and suppressing excessive melting
Implementation Method 2
a crystalline polyester resin melting at the time of fixing
Data Source
AI summary
A toner comprising: a toner particle comprising a binder resin and boric acid; wherein the binder resin comprises an amorphous resin and a crystalline polyester resin, a content of the crystalline polyester resin in the toner is 30.00 to 80.00 mass %, and a content of the boric acid in the toner is 0.10 to 10.00 mass %.