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Photocurable inkjet ink
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A photohardening and ink technology, applied in application, ink, optics, etc., can solve the problems of insufficient discussion of monomer volatility, high volatility, and difficulty in being used as inkjet ink, etc., and achieve re-ejection. good effect
Inactive Publication Date: 2019-12-17
JNC CORP
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Among them, acrylates are generally excellent in photocurability, but on the other hand, they have a strong odor and are highly irritating to the film. Therefore, photocurable resins containing these monomers have the disadvantage of impairing their working environment.
In addition, acrylates with lower viscosity are highly volatile, making it difficult to form fine patterns.
[0010] Those who use alkylene oxide or ε-caprolactone to modify these acrylate monomers to reduce odor or skin irritation have been developed, but the modified acrylate has its hardening speed or the hardness of the hardened product decreases, ink The disadvantage of increased viscosity
[0011] Patent Document 5 discloses that a composition containing a reactive oligomer as a urethane poly(meth)acrylate is effective for reducing odor or skin irritation. ) acrylate is obtained by the reaction of polyol, polyisocyanate and hydroxyl-containing (meth)acrylate, but it is difficult to be used as an inkjet ink because the viscosity of the composition is several thousand or more
[0012] Patent Document 6 discloses that a composition with a surface tension of 25 mN / m to 35 mN / m is effective for the formation of micro-droplets using the inkjet method, but the volatility of monomers has not been fully discussed
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[0168] 1.10.1. Preparation method of inkjet ink
[0169] The inkjet ink of the present invention can be prepared by mixing various components as raw materials by a known method.
[0170] In particular, the inkjet ink of the present invention is preferably prepared by mixing the components (A) to (D) and other components as needed, and filtering and degassing the resulting solution. The inkjet ink of the present invention prepared in this way is excellent in dischargeability at the time of inkjet coating. For the filtration, for example, a filter made of fluororesin, polyethylene, or polypropylene can be used.
[0171] 1.10.2. Viscosity of inkjet ink
[0172] The inkjet ink of the present invention has a viscosity at 25° C. measured with an E-type viscometer of 1 mPa·s to 200 mPa·s, preferably 2 mPa·s to 150 mPa·s, more preferably 3 mPa·s to 100 mPa·s. When the viscosity is the above, when the inkjet ink of the present invention is applied by the inkjet method, the discharge p...
Embodiment 1
[0263]
[0264] The evaluation liquid 1 was obtained by mixing and dissolving the materials shown below.
[0267] The viscosity of the evaluation liquid 1 was 31.7 mPa·s, and the non-volatility was 80.0%.
Embodiment 2～ Embodiment 3、 comparative example 1～ comparative example 11
[0269] Except having used the material shown in Table 1 instead of monofunctional monomer (B), evaluation liquid 2 - evaluation liquid 14 were prepared by the same method as Example 1, and the measurement of the viscosity and the measurement of non-volatility were performed.
[0270] [Table 1]
[0271]
[0272] As shown in Table 1, Examples 1 to 3 have a viscosity of 70 mPa·s or less and a non-volatility of 75% or more, so they are suitable for forming fine patterns as photocurable inkjet inks.
[0273] The viscosities of Comparative Examples 1 to 6 are 70 mPa·s or less, and the non-volatility is 75% or less. Therefore, it is considered that when used as an inkjet ink, the fine particles drawn due to volatilization of the monofunctional monomer The shape of the pattern is damaged, and it is difficult to obtain a stable pattern shape.
[0274] The viscosities of Comparative Example 7 and Comparative Example 8 are 70 mPa·s or more and the non-volatility is 75% or less. There...
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Abstract
An object of the present invention is to provide a photocurable inkjet ink with low volatility, which is useful in the manufacture of microlenses or electronic components. The photocurable inkjet ink of the present invention contains a polyfunctional (meth)acrylate (A), has a non-volatility of 75% or more in Evaluation Method 1, and has a viscosity of 1 mPa·s to 70 mPa·s (25°C). Monofunctional (meth)acrylate (B) and photopolymerization initiator (C), and the viscosity at 25°C is 1mPa·s~100mPa·s; [Evaluation method 1] the monofunctional (meth)acrylate (B): The weight ratio of pentaerythritol tetra(tri)acrylate=25:45 was mixed, and the evaluation liquid was produced. (1) The weight of the glass substrate of 5 cm x 5 cm was measured. (2) The evaluation liquid was dripped on the glass substrate of (1), and it applied so that a coating weight might become the error of 25 mg±2 mg by spin coating. (3) The weight of the glass substrate coated with the evaluation liquid of (2) was measured. (4) The weight of (1) was subtracted from the weight of (3) to calculate the coating weight of the evaluation liquid. (5) The glass substrate coated with the evaluation liquid in (3) was heated on a 50° C. hot plate for 15 minutes. (6) Measure the weight of the heated glass substrate of (5), subtract the weight of (1), and calculate the remaining amount of the evaluation liquid. (7) Calculate the non-volatility according to the following formula. Non-volatility % = balance ÷ coating weight x 100.
Description
technical field [0001] The present invention relates to a photocurable inkjet ink that can be preferably used for manufacturing optical devices such as image display devices. More specifically, it relates to an ink for forming a microlens that can be used in an optical system for improving stereoscopic imaging of an image or improving the light utilization efficiency of a device. [0002] Moreover, this invention relates to the photocurable inkjet ink which can be used suitably for manufacturing electronic components, such as a semiconductor device and a flexible wiring board. More specifically, it relates to a patterned insulating material for forming a buffer layer for wafer-level packaging, a rewiring insulating material, a barrier material, an underfill material, or a cover film for a flexible wiring board. ink. Background technique [0003] Regarding the microlens, it has been studied as a light guide plate for image display devices using its fine concave-convex struc...
Claims
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Application Information
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