Coloring Composition Striation Suppression via Solvent Surface Tension
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Solution Overview
Problem
The production of films using coloring compositions often results in striation, particularly on surfaces with unevenness, due to the existing limitations in coatability and drying properties.
Innovation Solution
A coloring composition comprising a coloring agent, resin, polymerizable compound, and photopolymerization initiator, with a specific ratio of ester-based and organic solvents that adjust surface tension and drying properties to suppress striation, including ester-based solvents with surface tensions between 25-35 mN/m and organic solvents with surface tensions below 25 mN/m, and a boiling point range of 50-135°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a coloring composition is applied onto a surface having floor level difference such as unevenness, then coating coverage is achieved, but radial streaks called striation are generated
Solution Approach 1:
The patent applies parameter changes by carefully selecting and controlling the surface tension of organic solvents (combining high surface tension solvents of 25-35 mN/m with low surface tension solvents of less than 25 mN/m) to optimize the coloring composition's wetting properties. This parameter optimization enables the composition to flow smoothly over uneven surfaces without forming striation, thereby improving film uniformity while coating complex substrates
Solution Approach 2:
The patent uses composite materials by combining multiple organic solvents with different surface tension characteristics in a specific ratio (50% or more of the total organic solvent content). This composite solvent system synergistically balances wetting ability and flow characteristics, allowing the coloring composition to adapt to surfaces with floor level differences while preventing radial streak formation
2Ease of operation
If conventional coloring compositions are used to improve coatability, then application ease is enhanced, but striation occurs on uneven surfaces
Solution Approach 1:
The patent improves both coatability and film quality through parameter changes by optimizing the surface tension parameters of the organic solvent system. The specific combination of high surface tension solvents (25-35 mN/m) and low surface tension solvents (<25 mN/m) creates ideal wetting properties that enhance application ease while simultaneously preventing striation, achieving both excellent coatability and high film quality
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 composition effectively suppresses striation during application, enhancing coatability and achieving improved film quality by optimizing wettability and drying properties.
Implementation Method 1
an organic solvent E including an ester-based solvent E1 having a surface tension at 25° C. of from 25 mN/m to 35 mN/m, an organic solvent E2 having a surface tension at 25° C. of less than 25 mN/m
Implementation Method 2
a polymerizable compound C; a photopolymerization initiator D
Data Source
AI summary
Provided are a coloring composition capable of producing a film with suppressed occurrence of striation, and a method for producing a film. The coloring composition includes a coloring agent A, a resin B, a polymerizable compound C, a photopolymerization initiator D, and an organic solvent E, in which the organic solvent E includes an ester-based solvent E1 having a surface tension at 25° C. of from 25 mN/m to 35 mN/m, an organic solvent E2 having a surface tension at 25° C. of less than 25 mN/m, a ratio of a mass of the ester-based solvent E1 to the mass of the organic solvent E2 is 80:20 to 30:70 in terms of the ratio of the mass of the ester-based solvent E1:the mass of the organic solvent E2, and the organic solvent E contains 50% by mass or more of a combination of the ester-based solvent E1 and the organic solvent E2 with respect to the total mass of the organic solvent E.