Phthalocyanine Dye Ink for High Density and Durability
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Solution Overview
Problem
Current cyan dye inks for ink jet recording fail to achieve a balance between high printing density and image durability, particularly on plain paper, due to issues with ozone resistance and light resistance, and existing formulations often compromise on either printing density or durability.
Innovation Solution
A dye ink composition containing a specific dye represented by general formula (I) and a compound represented by general formula (II), along with a toning agent, which stabilizes the dye and enhances intermolecular interactions to improve printing density and durability on plain paper without compromising image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the coloring agent concentration in the ink composition is increased to increase image density, then the image density improves, but the ink stability decreases
Solution Approach 1:
The patent changes the chemical structure parameters of the coloring agent by using a specific phthalocyanine derivative with particular substituents (formula 1) instead of conventional cyan dyes. This structural parameter change allows achieving high image density while maintaining ink stability, as the specific molecular structure provides both strong color development and resistance to degradation.
Solution Approach 2:
The patent creates a composite ink formulation by combining the specific phthalocyanine dye (formula 1) with conventional ink components. This composite approach leverages the superior properties of the novel dye molecule while maintaining the functional benefits of established ink formulation techniques, achieving both high density and stability.
2Reliability
If a pigment is used to achieve high fastness and water resistance, then the durability improves, but the pigment cannot be dispersed in water again once dry and aggregated
Solution Approach 1:
The patent uses a water-soluble dye instead of a pigment, accepting that dyes generally have lower fastness but compensating through the specific chemical structure of the phthalocyanine derivative which provides enhanced stability. This approach maintains water solubility and redispersibility while achieving sufficient durability through molecular design rather than particle aggregation.
3Quantity of substance
If the ink concentration is increased to achieve high printing density on plain paper, then the image density improves, but the drying time increases and ink may remain undried
Solution Approach 1:
The patent modifies the molecular parameters of the dye molecule (formula 1) to optimize the balance between color strength and drying characteristics. The specific substituent pattern on the phthalocyanine core provides high color density at lower concentrations, reducing the total ink load on the paper and thereby decreasing drying time while maintaining high printing density.
4Quantity of substance
If conventional cyan dyes are used to achieve high printing density, then the image density improves, but the ozone resistance and light resistance decrease
Solution Approach 1:
The patent fundamentally changes the chemical structure parameter by using a phthalocyanine derivative (formula 1) instead of conventional cyan dyes. The macrocyclic phthalocyanine structure with specific substituents provides inherent resistance to ozone and light degradation while maintaining strong color development, simultaneously improving both printing density and durability.
Solution Approach 2:
The patent converts the typical weakness of dyes (low fastness) into a benefit by using a water-soluble phthalocyanine derivative that combines dye-like solubility with pigment-like stability. The specific molecular structure allows the dye to form stable associations that resist degradation from ozone and light while maintaining water solubility for easy application and drying.
Data Source
AI summary
A dye ink composition includes: a dye represented by the general formula (I) as defined herein; water; a compound represented by the general formula (II) as defined herein; and a toning agent represented by the general formula (Cy-2) as defined herein.