Enzymatic Crystalline Polyester Resin for Low-Gloss Cold-Pressure Fusing
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Solution Overview
Problem
Conventional polyester resin synthesis for low-melt toners is limited by narrow compatibility ranges and requires high-temperature polycondensation with metal catalysts, leading to environmental challenges and toners with high gloss, while there is a need for toners suitable for cold pressure fusing.
Innovation Solution
Enzymatic ring-opening polymerization of lactones, cyclic anhydrides, and cyclic carbonates using lipases and cutinases to produce crystalline polyesters with controlled melting points, allowing for the formation of toner particles with low gloss and suitability for cold pressure fusing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high-temperature polycondensation with metal catalysts is used to produce crystalline polyesters, then the melting point control and toner formation are achieved, but environmental harm increases and energy consumption rises
Solution Approach 1:
The patent changes the fundamental parameters of the polymerization process by using enzymatic catalysis at lower temperatures (ambient to moderate temperatures) instead of high-temperature polycondensation with metal catalysts. This parameter change enables the production of crystalline polyesters with controlled melting points while eliminating the harmful environmental effects of metal catalysts and reducing energy consumption.
Solution Approach 2:
The patent substitutes the mechanical/thermal polycondensation process with a biochemical enzymatic polymerization process. Instead of relying on high temperature and metal catalysts, the invention uses biocatalysts (enzymes) to drive the polymerization reaction, replacing the harsh mechanical-thermal system with a milder biochemical system that achieves the same functional outcome.
2Quantity of substance
If conventional polycondensation processes are used, then polyester resins are produced, but the compatibility range with amorphous components is very narrow
Solution Approach 1:
The enzymatic polymerization process enables precise control over the molecular weight, molecular weight distribution, and chemical structure of the crystalline polyester. This parameter control allows for better compatibility with a wider range of amorphous components, expanding the compositional versatility of low-melt toners beyond the narrow compatibility range achieved by conventional polycondensation.
3Use of energy by moving object
If sharp-melting crystalline resin components are used to provide low-melt behavior, then energy efficiency improves, but the toner exhibits high gloss
Solution Approach 1:
The patent applies local quality by creating a toner composition with distinct functional zones: the enzymatically produced crystalline polyester provides localized sharp melting behavior for energy-efficient fusing, while the amorphous polyester matrix provides the bulk material properties and controls the surface gloss. This spatial and functional differentiation allows simultaneous optimization of both energy efficiency and gloss characteristics.
4Ease of manufacture
If crystalline polyesters are synthesized by high-temperature polycondensation, then the resin is produced, but the presence of metal catalysts and high energy requirements create environmental challenges
Solution Approach 1:
The patent replaces the high-temperature mechanical polycondensation process with enzymatic polymerization that proceeds at lower temperatures. This substitution eliminates the need for metal catalysts and reduces energy input, thereby maintaining resin production capability while significantly reducing environmental impact.
Solution Approach 2:
The patent introduces enzymes as intermediary biocatalysts to mediate the polymerization reaction. These enzymatic intermediaries enable the synthesis of crystalline polyesters under milder conditions without requiring harsh metal catalysts or high temperatures, thus resolving the environmental challenges associated with conventional production methods.
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 process enables the production of crystalline polyesters with precise melting points, expanding the range of available compositions and improving toner properties, such as low gloss and energy-efficient cold pressure fusing, while reducing environmental impact.
Implementation Method 1
contacting at least one component such as lactones, lactides, cyclic anhydrides, cyclic carbonates, and combinations thereof, with an enzyme such as lipases, cutinases, and combinations thereof polymerizing the at least one component to form a crystalline polyester resin
Data Source
AI summary
The present disclosure provides for enzymatic polymerization to produce polyester resins suitable for use in manufacturing toners. In embodiments, crystalline copolymers, which are polyesters, may be synthesized from lactones, cyclic anhydrides, cyclic carbonates, and combinations thereof. These crystalline copolymers, in turn, may be utilized in the synthesis of toner particles.