Resin-Coated Pigment Ink Composition for Intercolor Bleeding Control
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Solution Overview
Problem
Existing ink compositions face issues with intercolor bleeding when multiple inks of different hues are applied in layers, and the inclusion of certain amphoteric surfactants can compromise storage stability.
Innovation Solution
An ink composition containing a resin-coated pigment, a betaine compound with an alkyl group of 6 to 20 carbon atoms, and water, where the betaine compound is used to enhance the ink film, and the resin is cross-linked to prevent resin peeling and maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a betaine compound with an alkyl group is added to suppress intercolor bleeding, then bleeding prevention is improved, but storage stability deteriorates due to interactions with resin-coated pigments
Solution Approach 1:
The patent changes the molecular weight parameter of the betaine compound to 1000 or less, which fundamentally alters its interaction characteristics with resin-coated pigments. This parameter change allows the betaine compound to suppress intercolor bleeding through enhanced surface tension while minimizing harmful interactions that compromise storage stability, thus resolving the technical contradiction between bleeding prevention and storage stability
Solution Approach 2:
The patent creates a composite system combining cross-linked resin-coated pigments with specific betaine compounds (molecular weight ≤1000). The cross-linked resin structure works synergistically with the betaine compound to maintain pigment coating integrity while enabling effective bleeding suppression, thereby achieving both improved bleeding prevention and maintained storage stability
2Reliability
If a cross-linked resin is used to coat pigments to maintain storage stability, then storage stability is improved, but intercolor bleeding suppression deteriorates
Solution Approach 1:
The betaine compound acts as an intermediary substance between the cross-linked resin-coated pigment and the recording medium. It mediates the surface interactions to prevent intercolor bleeding while allowing the cross-linked resin to maintain its pigment coating, thus resolving the contradiction between storage stability and bleeding suppression
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 solution effectively suppresses intercolor bleeding and maintains storage stability, ensuring excellent jettability and image quality, particularly suitable for inkjet inks.
Implementation Method 1
a resin-coated pigment in which at least a part of pigments is coated with a cross-linked resin
Implementation Method 2
the ink composition further contains an anionic or amphoteric surfactant
Implementation Method 3
an ink composition composed of at least a coloring material, an anionic resin emulsion, a water-soluble organic solvent, and water, and a reaction solution including a reactant which causes aggregate in a case of being in contact with the aqueous ink composition and a cationic resin emulsion, in which the ink composition further contains an anionic or amphoteric surfactant
Data Source
AI summary
An ink composition includes a resin-coated pigment in which at least a part of pigments is coated with a cross-linked resin, a betaine compound (1) represented by Formula (1), and water. R1 represents an alkyl group having 6 to 20 carbon atoms, R2 and R3 each independently represent a chain hydrocarbon group having 1 to 3 carbon atoms, L1 represents a single bond or a divalent linking group, L2 represents a divalent linking group, and A-represents a —SO3− group or a —COO− group.