Ink Composition Using Polyether-Modified Silicone Oil for Wettability
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Solution Overview
Problem
Ink compositions for ink jet recording face challenges in achieving excellent solid filling properties, storage stability, and abrasion resistance, particularly due to issues with wettability and spreadability related to surface tension and the presence of coating film forming materials.
Innovation Solution
An ink composition containing a polyether-modified silicone oil with a specific solubility parameter range (SP value of 8.5 or less and 18.0 or more) is used, which balances hydrophobicity and hydrophilicity, along with a coating film forming material, to enhance solid filling properties and storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the surface tension of the ink composition is reduced to improve wettability and spreadability, then solid filling properties are improved, but storage stability deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully controlling the surface tension of the ink composition within a specific range (20-35 mN/m) and by selecting polyether-modified silicone oil with a specific solubility parameter range (8.5-18.0). This optimized parameter selection allows the ink to achieve both good wettability for solid filling and sufficient storage stability, resolving the contradiction between these two properties.
Solution Approach 2:
The patent uses composite materials by combining polyether-modified silicone oil with specific coating film forming materials (such as polyester diacrylate, polyacrylonitrile, or acrylic acid and its derivatives). This composite approach allows the ink composition to simultaneously achieve low surface tension for good wettability while maintaining storage stability through the synergistic effects of the combined materials.
2Manufacturing precision
If polyether-modified silicone oil with high hydrophobicity (low SP value) is used to improve wettability, then solid filling properties are improved, but clouding point decreases and storage stability under high temperature deteriorates
Solution Approach 1:
The patent resolves this contradiction by optimizing the solubility parameter (SP value) of the polyether-modified silicone oil within the range of 8.5-18.0. This parameter optimization balances hydrophobicity and hydrophilicity, ensuring adequate wettability for solid filling while maintaining a sufficiently high clouding point for storage stability under high temperature conditions.
3Strength
If coating film forming material is added to improve abrasion resistance, then image quality is improved, but solid filling properties and storage stability deteriorate
Solution Approach 1:
The patent applies parameter changes by controlling the surface tension of the ink composition within 20-35 mN/m and selecting coating film forming materials with specific properties (such as polyester diacrylate with acid value of 10 or less, or polyacrylonitrile with specific molecular weight). These parameter optimizations allow the ink to maintain good wettability and solid filling properties while achieving adequate abrasion resistance.
Solution Approach 2:
The patent uses composite materials by combining polyether-modified silicone oil with specific coating film forming materials in optimized ratios. This composite approach allows the ink to simultaneously achieve good abrasion resistance from the coating film forming material while maintaining solid filling properties through the surface tension control provided by the polyether-modified silicone oil.
4Reliability
If polyether-modified silicone oil with high hydrophilicity (high SP value) is used, then storage stability is improved, but wettability and spreadability deteriorate
Solution Approach 1:
The patent resolves this contradiction by optimizing the solubility parameter (SP value) of the polyether-modified silicone oil within the range of 8.5-18.0. This parameter optimization balances hydrophobicity and hydrophilicity, ensuring both adequate wettability for solid filling and sufficient storage stability. The patent specifically notes that polyether-modified silicone oil with higher hydrophilicity (SP value around 13 or higher) is appropriately used mainly in aqueous ink to achieve this balance.
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 composition exhibits improved wettability, spreadability, and abrasion resistance, maintaining stability under various conditions, including high temperatures, and ensures effective attachment and curing on recording media.
Implementation Method 1
an ink composition having a low surface tension was difficult to wet and spread on a recording medium
Implementation Method 2
it was found that an ink composition having a low surface tension was difficult to wet and spread on a recording medium
Implementation Method 3
a composition as an ink composition containing a coating film forming material with excellent solid filling properties
Implementation Method 4
a photopolymerizable compound dispersion liquid formed of polyester diacrylate
Data Source
AI summary
An ink composition for ink jet recording includes a coating film forming material, a polyether-modified silicone oil, and water, wherein the polyether-modified silicone oil is soluble in a solvent in which a lower limit of an SP value is 8.5 or less and an upper limit of the SP value is 18.0 or more.