Rosin-Modified Polyester Resin for Active-Energy-Ray-Curable Ink
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Solution Overview
Problem
Existing active-energy-ray-curable inks for plate offset printing lack sufficient misting resistance (scattering suppression properties) and dissolubility in active-energy-ray-curable monomers with 4 or more functional groups, which are required for high-speed and mass printing applications.
Innovation Solution
A rosin-modified polyester resin is developed with specific ranges of ester bond content, acid value, and hydroxyl value, along with a balanced mole ratio of dihydric alcohol to rosins, to enhance misting resistance and dissolubility in active-energy-ray-curable monomers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acrylate-added disproportionated rosin alkyd resin is used in existing active-energy-ray-curable ink formulations, then the ink can be cured with active energy rays, but the misting resistance (scattering suppression properties) is insufficient for high-speed printing applications
Solution Approach 1:
The patent changes the chemical parameters of the resin by specifying precise ranges for ester bond content (5.30-6.85 mol/kg), acid value (1-20 mgKOH/g), and hydroxyl value (1-30 mgKOH/g). These parameter adjustments optimize the resin's interaction with the curable monomer, improving misting resistance while maintaining manufacturability through controlled synthesis conditions.
Solution Approach 2:
The patent creates a composite resin system by modifying polyester resin with rosin components. This composite structure combines the dissolubility advantages of polyester resin with the misting resistance properties of rosin, achieving both required functionalities in a single material component.
2Reliability
If resins with improved misting resistance are used, then scattering suppression properties improve, but dissolubility in active-energy-ray-curable monomers with 4 or more functional groups deteriorates
Solution Approach 1:
The patent optimizes the balance between ester bond content, acid value, and hydroxyl value to achieve simultaneous improvement in both misting resistance and dissolubility. The specific parameter ranges create a resin with optimal polarity and molecular structure that is compatible with high-functionality monomers while maintaining scattering suppression properties.
Solution Approach 2:
The patent introduces local chemical functionality through rosin modification at specific sites on the polyester backbone. This localized modification provides misting resistance at the resin-monomer interface while the overall polyester structure maintains dissolubility, achieving both properties through spatially differentiated chemical characteristics.
3Use of energy by moving object
If monomers with 4 or more functional groups are used to enable low-energy curing, then energy efficiency improves, but dissolubility of the resin in the monomer deteriorates
Solution Approach 1:
The patent adjusts the resin's chemical parameters (ester bond content, acid value, hydroxyl value) to match the high polarity and reactivity of multi-functional monomers. This parameter optimization enables the resin to dissolve in aggressive monomers like dipentaerythritol hexaacrylate while maintaining performance, allowing low-energy curing without sacrificing homogeneity.
4Productivity
If high-speed printing is implemented, then productivity increases, but misting resistance requirements become more stringent
Solution Approach 1:
The patent optimizes resin parameters to enhance misting resistance specifically for high-speed printing conditions. The controlled ester bond content and hydroxyl value create a resin that maintains film integrity at high printing speeds, preventing ink scatter and ensuring sharp print quality even under increased mechanical stress.
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 resin achieves excellent misting resistance and dissolubility, enabling improved printing properties and compatibility with high-reactivity monomers, allowing for quick-drying and energy-efficient curing.
Implementation Method 1
the resin for ink is required to have dissolubility in the active-energy-ray-curable monomer
Implementation Method 2
to be cured by an active energy ray such as ultraviolet rays and electron rays
Data Source
AI summary
In a resin for an active-energy-ray-curable ink containing a rosin-modified polyester resin, the rosin-modified polyester resin includes a reaction product of a material component containing rosins, a dibasic acid, and a polyol. The rosin-modified polyester resin has an ester bond in an amount of 5.20 mol/kg or more and 7.20 mol/kg or less. The rosin-modified polyester resin has an acid value of 1 mgKOH/g or more and 30 mgKOH/g or less. The rosin-modified polyester resin has a hydroxyl value of 1 mgKOH/g or more and 40 mgKOH/g or less.