Ultraviolet curable silicone composition and cured product of same

a silicone composition and ultraviolet technology, applied in the field of ultraviolet curable silicone composition, can solve the problems of inability to eject inkjet, never been a silicone material capable of ejecting inkjet, etc., and achieve the effects of favorable viscosity, surface tension and curability, and favorable rubber properties

Inactive Publication Date: 2019-08-01
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0024]The ultraviolet curable silicone composition of the present invention has a favorable viscosity, surface tension and curability, and can be ejected via inkjet ejection. Further, the cured product of this composition has favorable rubber properties (hardness, tensile strength and elongation at break). In this way, the ultraviolet curable silicone composition of the invention is useful as an ink-jet ink material, particularly as a silicone material for use in an ink-jet 3D printer.

Problems solved by technology

This is mainly because silicone has a significantly low surface tension; and if contained in the ink by a large amount, the ink cannot be ejected via inkjet ejection.
While there has already been proposed a silicone material for use in a 3D printer (Patent document 5), there has never been a silicone material capable of being ejected via inkjet ejection.

Method used

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  • Ultraviolet curable silicone composition and cured product of same
  • Ultraviolet curable silicone composition and cured product of same
  • Ultraviolet curable silicone composition and cured product of same

Examples

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working example

[0056]The present invention is described in detail hereunder with reference to working and comparative examples. However, the invention is not limited to the following working examples.

[0057]Compositions in working examples 1 to 6; and comparative examples 1 and 2 were prepared at the composition ratios shown in Table 1, and then evaluated by the following methods.

[0058]In the following examples, a viscosity of the composition refers to a value measured by a rotary viscometer at 23° C. A surface tension refers to a value measured by a CBVP-Z type automatic surface tensiometer manufactured by Kyowa Interface Science Co., Ltd.

[0059]Further, an inkjet ejection property was evaluated as follows. Specifically, there was used a droplet observation device IJK-2005 (glass-made 1-nozzle inkjet head IJHE-1000) manufactured by MICROJET Corporation, and an ejection status was shot with camera for evaluation under ejection conditions of: drive voltage 80V; head temperature 80° C.; and nozzle dia...

synthesis example 1

[0063]Put into a glass-made reactor equipped with a thermometer and a stirrer were 42 g of 1,3-bis(methacryloxypropyl)tetramethyldisiloxane, 806 g of octamethylcyclotetrasiloxane and 1.3 g of trifluoromethanesulfonic acid, followed by reacting them at 60° C. for five hours. Later, the temperature was reduced to 25° C., and 4 g of hydrotalcite (KYOWAAD 500 by Kyowa Chemical Industry Co., Ltd.) was added to perform neutralization. After filtration was completed, vacuum concentration was carried out at 120° C. to obtain 700 g of an organopolysiloxane A-1. The structure of A-1 (number of repeating units of dimethylsiloxy groups) was calculated via 29Si-NMR.

synthesis example 2

[0064]Put into a glass-made reactor equipped with a thermometer and a stirrer were 22 g of 1,3-bis(methacryloxypropyl)tetramethyldisiloxane, 248 g of octamethylcyclotetrasiloxane and 0.2 g of trifluoromethanesulfonic acid, followed by reacting them at 60° C. for five hours. Later, the temperature was reduced to 25° C., and 4 g of hydrotalcite (KYOWAAD 500 by Kyowa Chemical Industry Co., Ltd.) was added to perform neutralization. After filtration was completed, vacuum concentration was carried out at 120° C. to obtain 200 g of an organopolysiloxane A-2. The structure of A-2 (number of repeating units of dimethylsiloxy groups) was calculated via 29Si-NMR.

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Abstract

Provided is an ultraviolet curable silicone composition capable of being ejected via inkjet ejection. The composition of the invention is an ultraviolet curable silicone composition comprising:
    • (A) an organopolysiloxane represented by the following general formula (1)
wherein each R1 independently represents a group selected from a monovalent aliphatic hydrocarbon group having 1 to 10 carbon atoms, an acryloyl group, a methacryloyl group, an alkyl acrylate group and an alkyl methacrylate group, while the component (A) has per molecule at least two groups selected from an acryloyl group, a methacryloyl group, an alkyl acrylate group and an alkyl methacrylate group; n represents a number satisfying 10≤n≤1,000;
    • (B) a monofunctional (meth)acrylate compound having no siloxane structure; and/or
    • (C) a multifunctional (meth)acrylate compound having no siloxane structure; and
    • (D) a photopolymerization initiator.

Description

TECHNICAL FIELD[0001]The present invention relates to an ultraviolet curable silicone composition capable of being ejected via inkjet ejection; and a cured product thereof.BACKGROUND ART[0002]Ultraviolet curable ink-jet inks in the field of industrial inkjet printer are about to become mainstream, due to the fact that they are quick-drying and low-volatile, and can even be printed on a non-absorbable material. Although there are examples (Patent documents 1, 2 and 3) where silicone is contained by a small amount in such ultraviolet curable ink-jet ink, as a defoaming agent, a surfactant and / or a wear resistance improving agent, there has never been an example where silicone is used as a main component in such ink jet ink. This is mainly because silicone has a significantly low surface tension; and if contained in the ink by a large amount, the ink cannot be ejected via inkjet ejection. However, if silicone can be used as a main component, not only a favorable rubber property can be ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09D11/38B33Y70/00C09D11/101C09D11/102
CPCC09D11/38B33Y70/00C09D11/101C09D11/102B29C64/112C09D11/30C08F283/124C08G77/20C08F283/14C08L83/10C08G77/442B33Y80/00C08F220/1811C08F222/10C08F2/48C08F290/148C08F290/06B41M5/00
Inventor MATSUMOTO, NOBUAKIKITAGAWA, TAICHIYAGINUMA, ATSUSHISHIROTA, MASAAKI
Owner SHIN ETSU CHEM IND CO LTD
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