Oil-Based Writing Board Ink With Cyclohexane Ester Release Agents
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Solution Overview
Problem
Conventional oil-based inks for writing boards face safety concerns with phthalic acid esters, and higher fatty acid esters like cetyl isooctanoate, while offering erasing performance, struggle with low compatibility and handwriting density issues, especially when combined with polyvinyl butyral resin, leading to unerased residues and decreased erasability over time.
Innovation Solution
Incorporating cyclohexane dicarboxylic acid esters represented by specific general formulas as release agents in the ink composition, maintaining high compatibility with polyvinyl butyral resin, ensuring uniform dispersion and preventing pigment separation, thus enhancing erasability and dry-up resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If higher fatty acid esters such as cetyl isooctanoate are used as a release agent, then safety concerns are resolved and erasing performance is provided, but handwriting erasability deteriorates and unerased residues are generated after long-term storage
Solution Approach 1:
The patent changes the chemical structure parameters of the release agent by introducing a cyclohexane ring structure with specific ester groups. This structural modification maintains the safety benefits of higher fatty acid esters while improving erasability by preventing residue formation through the unique molecular geometry and intermolecular interactions of the cyclohexane-based structure.
Solution Approach 2:
The patent uses a composite approach by combining the cyclohexane ring structure with specific ester functional groups (carboxylic acid ester and hydroxycarboxylic acid ester). This composite molecular structure integrates the safety properties of higher fatty acid esters with enhanced erasability characteristics, resolving the contradiction between safety and reliability.
2Stability of the object's composition
If higher fatty acid esters are used in combination with polyvinyl butyral resin, then appropriate fixability and pigment dispersibility are obtained, but compatibility is lowered and handwriting density decreases when dried
Solution Approach 1:
The patent modifies the release agent structure by incorporating a cyclohexane ring with specific ester functional groups, which changes the molecular parameters to improve compatibility with polyvinyl butyral resin. This structural parameter change prevents the lowering of handwriting density while maintaining the fixability provided by the resin system.
3Ease of operation
If conventional release agents are used, then erasing performance is achieved, but dry-up resistance is poor and blurring occurs
Solution Approach 1:
The patent changes the molecular structure of the release agent to include a cyclohexane ring with specific ester groups, which modifies the physical and chemical parameters to provide both good erasing performance and excellent dry-up resistance. The structural parameters are optimized to prevent blurring while maintaining ease of erasure.
Data Source
AI summary
The present invention provides: a highly practical and safe oil-based ink composition for a writing board, said composition being capable of imparting high mark-erasability and having excellent resistance to drying up; and a marking pen incorporating the same. Specifically, the present invention provides: an oil-based ink composition for a writing board, said composition containing a pigment, an organic solvent, a resin, and at least one compound selected from compounds represented by general formula (1) or (2); and a marking pen obtained by incorporating the oil-based ink composition for a writing board. (In the formulae, R1-R4 each represent a C6-18 alkyl group or a C2-18 and 02-10 alkoxypolyglycol group.)