Methanol-Free Phenolic Resole Ink for Non-Porous Substrates
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Solution Overview
Problem
Continuous inkjet ink compositions pose safety concerns due to the presence of harmful chemicals like methanol, halogens, and bisphenol A, which are toxic and carcinogenic, and existing formulations do not adequately address the need for safe and reliable printing on non-porous substrates.
Innovation Solution
The development of ink compositions that are free or substantially free of methanol, halogens, halogenated compounds, and bisphenol A, using phenolic resole resins with less than 0.1% free formaldehyde, combined with organic solvents and colorants, to ensure safe and effective printing on various substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If phenolic resins with 0.3% or greater free formaldehyde are used to achieve good adhesion to non-porous substrates, then adhesion performance is improved, but health safety deteriorates due to carcinogenic classification
Solution Approach 1:
The patent changes the critical parameter of free formaldehyde content from 0.3% or greater to less than 0.3%, thereby reclassifying the phenolic resin from Category 1B carcinogen to a safer classification while maintaining adhesion performance through optimized resin formulation
Solution Approach 2:
The patent uses composite binder resin systems combining phenolic resins with other resin types (such as polyurethane, acrylic, or epoxy resins) to achieve the required adhesion to non-porous substrates without relying solely on high formaldehyde-content phenolic resins
2Loss of time
If methanol is used as the main solvent to achieve fast-dry time and good adhesion, then drying speed is improved, but health safety deteriorates due to toxic inhalation risks
Solution Approach 1:
The patent extracts and removes methanol from the ink composition entirely, replacing it with alternative solvents such as water, alcohols (ethanol, isopropanol), or glycol ethers that provide comparable drying characteristics without the severe toxic inhalation risks of methanol
Solution Approach 2:
The patent changes the solvent composition parameters by reducing methanol content to less than 5% by weight (preferably less than 1% or completely eliminated) and adjusting the proportions of alternative solvents to maintain fast-dry performance
3Reliability
If halogenated compounds are included in binder resins and conductive agents to achieve desired performance, then functional performance is improved, but health safety deteriorates due to extreme toxicity of gaseous halogens
Solution Approach 1:
The patent extracts and removes halogenated compounds from the ink composition, specifically eliminating substances containing fluorine, chlorine, bromine, or iodine from binder resins, conductive agents, and other additives, replacing them with non-halogenated alternatives that provide equivalent functional performance
Solution Approach 2:
The patent changes the chemical composition parameters by specifying that the ink contains less than 50 ppm (preferably less than 1 ppm or completely eliminated) of halogenated compounds, thereby eliminating the source of toxic gaseous halogens
4Stability of the object's composition
If bisphenol A is present in phenolic resins to achieve resin stability and performance, then resin performance is improved, but health safety deteriorates due to reproductive toxin classification
Solution Approach 1:
The patent changes the parameter of bisphenol A content by specifying that the ink contains less than 50 ppm (preferably less than 1 ppm or completely eliminated) of this reproductive toxin, achieving resin stability through alternative phenolic resin formulations without BPA
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 ink compositions provide superior health and safety profiles, ensuring reliable adhesion and drying times while avoiding the use of hazardous substances, making them suitable for industrial applications in continuous inkjet printing.
Implementation Method 1
Resole type phenolic resins undergo cross-link reactions at elevated temperatures and display good adhesion to non-porous substrates such as glass, polymer films, aluminum and steel
Implementation Method 2
Some commercial thermo-curable continuous inkjet inks use methanol as the solvent or the main solvent because such inks produce a fast-dry time due to their volatility
Data Source
AI summary
Embodiments of the invention relate to ink compositions suitable for applications in the printing industry, for example continuous inkjet printing, including ultra-high speed continuous inkjet printing. The ink compositions use volatile organic solvents, a colorant, and one or more binder resins including a resin that is a phenolic resole resin, wherein the ink composition is free of methanol, halogens, halogenated compounds and bisphenol-A. A phenolic resole resin of the ink composition preferably contains less than 0.1% by weight of free formaldehyde. The one or more binder resins including the phenolic resole resin may be present in an amount that is from about 5% to about 30% by weight of the ink composition.