Inkjet Ink Composition Using Hyperbranched Acrylate for Viscosity Stability
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Solution Overview
Problem
Existing inkjet ink compositions face challenges in achieving sufficient hardness and adhesiveness while preventing increases in viscosity and particle size, as well as the generation of precipitates, especially in high-temperature and high-humidity environments, which can lead to inkjet head clogging.
Innovation Solution
An inkjet ink composition containing a compound with a specific structure, a hyperbranched acrylate oligomer or polymer, and additional components such as polyfunctional (meth)acrylates and gelling agents, which suppresses viscosity increase and particle size variation, and inhibits hydrolysis and precipitate formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a photopolymerizable compound having a phosphoric acid group or a sulfonic acid group is used, then the ink can provide certain hardness and adhesiveness, but the viscosity and particle size increase due to pigment aggregation, and clogging of inkjet head filter occurs
Solution Approach 1:
The invention changes the chemical structure parameter of the photopolymerizable compound from conventional phosphoric acid or sulfonic acid groups to a specific carboxylic acid structure with formula (1) containing an ester bond. This structural parameter change reduces pigment aggregation and prevents viscosity increase during storage while maintaining adequate hardness and adhesiveness of the cured film.
Solution Approach 2:
The invention uses a composite approach by combining the specific carboxylic acid compound (A) with a hyperbranched acrylate oligomer or polymer (B). This composite material strategy leverages the adhesive properties of compound (A) and the stability provided by the hyperbranched structure of (B) to achieve both hardness and storage stability.
2Reliability
If a photopolymerizable compound with a carboxy group is used, then the increase in viscosity and particle size is less likely to occur, but it is difficult to obtain sufficient hardness and adhesiveness as a resist film
Solution Approach 1:
The invention modifies the carboxylic acid compound structure by introducing a specific ester bond configuration as shown in formula (1), where the compound contains X (acryloyl, methacryloyl, allyl, vinyl group or derivative), Q (oxygen atom or NR4), and R1 (alkylene group with 1-6 carbon atoms). This structural parameter change enhances both hardness and adhesiveness while maintaining viscosity stability.
Solution Approach 2:
The invention creates a composite system combining the ester-bond-containing carboxylic acid compound (A) with hyperbranched acrylate oligomer or polymer (B). This composite approach synergistically improves hardness and adhesiveness while the hyperbranched structure contributes to maintaining viscosity and particle size stability during storage.
3Strength
If the compound having a specific structure is used, then sufficient hardness and adhesiveness can be obtained, but a hydrolysate is precipitated in high-temperature and high-humidity environment, causing clogging of inkjet head filter
Solution Approach 1:
The invention introduces a hyperbranched acrylate oligomer or polymer (B) as an intermediary component that interacts with the carboxylic acid compound (A). The hyperbranched structure of (B) appears to suppress the hydrolysis reaction of (A) in high-temperature and high-humidity environments, preventing precipitate formation and filter clogging while allowing (A) to provide adequate hardness and adhesiveness.
4Reliability
If a carbodiimide compound is used to suppress hydrolysis, then the mechanism of suppressing hydrolysis by reacting with carboxylic acid is achieved, but the viscosity of the ink tends to increase
Solution Approach 1:
The invention replaces the carbodiimide compound with a hyperbranched acrylate oligomer or polymer (B) that provides hydrolysis suppression without the severe viscosity increase. The hyperbranched structure of (B) offers an alternative mechanism that is more compatible with inkjet ink viscosity requirements while still protecting against hydrolysis in high-temperature and high-humidity conditions.
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 achieves both hardness and adhesiveness, maintains stable viscosity and particle size, and prevents precipitate formation, even in high-temperature and high-humidity conditions, ensuring reliable inkjet printing and extended storage stability.
Implementation Method 1
by containing a compound having a specific structure and a hyperbranched acrylate oligomer or polymer, it is possible to achieve both sufficient hardness and adhesiveness as a recorded matter, to suppress an increase in viscosity during long-term storage or retention, to suppress a change in particle diameter, and to suppress hydrolysis even under a high-temperature and high-humidity environment to suppress the generation of a precipitate
Implementation Method 2
an inkjet ink composition that is curable with an active energy ray or heat
Implementation Method 3
an inkjet ink composition that is curable with an active energy ray or heat
Data Source
AI summary
Provided is an inkjet ink composition that is curable with an active energy ray or heat, containing: a compound having a structure represented by Formula (1) or salt thereof (A); and a hyperbranched acrylate oligomer or polymer (B), in Formula (1), X represents a substituent having at an end thereof at least one selected from an acryloyl group, a methacryloyl group, an allyl group, a vinyl group and derivatives thereof, Q represents an oxygen atom or NR4, and R4 represents a hydrogen atom, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group, and R1 represents an unsubstituted alkylene group having 1 to 6 carbon atoms.