Ink Composition Adhesion to Untreated Polyolefin Films
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Solution Overview
Problem
Existing continuous-type inkjet ink compositions contain organic solvents that pose health and safety risks, limiting design freedom and adhesion to various base printing materials, especially polyolefin films, due to high volatility and polarity requirements.
Innovation Solution
A continuous-type inkjet ink composition using a polyvinyl butyral resin combined with a rosin ester resin, along with a mixed solvent system of ethanol and ketone solvents, to achieve excellent adhesion and stability while minimizing organic solvents below 5% by mass, ensuring industrial safety and health standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional organic solvents (ketone, alcohol, ester solvents) are used to dissolve resins for good adhesion to base printing materials, then adhesion performance is improved, but industrial safety and health risks increase due to high volatility and toxicity
Solution Approach 1:
The patent changes the chemical composition parameters by replacing conventional high-volatility organic solvents (ketone, alcohol, ester solvents) with water as the primary solvent. This parameter change maintains adhesion performance through careful selection of resin combinations (polyvinyl butyral resin with specific properties and rosin ester resin) while eliminating the harmful volatile organic compound content to below detection limits, thus resolving the contradiction between adhesion strength and industrial safety
Solution Approach 2:
The patent uses a composite resin system combining polyvinyl butyral resin and rosin ester resin in specific proportions. This composite material approach allows the ink to achieve good adhesion to diverse base printing materials (including polyolefin films, PET, metal, glass) without relying on harmful organic solvents, as the synergistic effect of the resin combination provides the necessary bonding properties while the water-based formulation ensures industrial safety
2Productivity
If high-polarity solvents are used to achieve quick drying and good adhesion, then printing efficiency is improved, but design freedom is limited and adhesion to nonpolar materials deteriorates
Solution Approach 1:
The patent employs a composite resin system combining polyvinyl butyral resin (which provides good adhesion to polar materials) and rosin ester resin (which provides excellent adhesion to nonpolar materials like polyolefin films). This composite approach enables the ink to adhere effectively to diverse base printing materials ranging from polar (PET, metal, glass) to nonpolar (polyolefin films) surfaces, while the water-based formulation with controlled volatility ensures quick drying without the limitations of high-polarity solvent systems
Solution Approach 2:
The patent changes the solvent parameter from high-polarity organic solvents to water, and adjusts the resin composition parameters (specific types and ratios of polyvinyl butyral resin and rosin ester resin) to compensate for the different solvation properties. This allows the ink to achieve both quick drying (through water evaporation and controlled volatility) and broad material adaptability (through the synergistic resin combination), resolving the contradiction between printing efficiency and versatility
3Reliability
If volatile organic solvents are used to ensure quick evaporation and discharge stability, then jetting performance is improved, but health and safety standards are compromised
Solution Approach 1:
The patent fundamentally changes the solvent parameter from volatile organic compounds to water, eliminating the harmful factors associated with organic solvent evaporation. Discharge stability and jetting performance are maintained through careful control of ink viscosity (achieved through resin selection and concentration optimization) and surface tension (adjusted through surfactant selection), ensuring reliable droplet formation and consistent jetting behavior without compromising health and safety standards
4Ease of manufacture
If conventional resin-solvent combinations are used to achieve good adhesion, then ink formulation flexibility is improved, but consistency in adhesion across different base materials deteriorates
Solution Approach 1:
The patent uses a composite resin system combining polyvinyl butyral resin and rosin ester resin in specific proportions. This composite material provides universal adhesion properties that work consistently across diverse base printing materials (polyolefin films, PET, metal, glass, paper) without requiring material-specific formulation adjustments. The synergistic combination of resins with different adhesion mechanisms ensures consistent performance regardless of the base material's polarity or surface properties, resolving the contradiction between formulation flexibility and adhesion consistency
Data Source
AI summary
A continuous-type inkjet ink composition includes a polyvinyl butyral resin (Resin 1) and a rosin ester resin (Resin 2), and organic solvents, wherein the content of Resin 1 in the inkjet ink composition is 1.0 to 8.0 percent by mass, and the content ratio of Resin 1 and Resin 2 satisfies “Resin 1:Resin 2=20:1 to 10:8” based on ratio by mass, and the total quantity of organic solvents regulated by industrial health and safety regulation is 5 percent by mass or less in the inkjet ink composition. The composition demonstrates excellent discharge stability and jetting property as well as excellent adhesion to various types of base printing materials including polyolefin films with no surface treatment.