JP2012074644A - Micro-contact printing material and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form fine pattern directly on a surface of composition by irradiating ultraviolet laser radiation using stereolithography, so that a silicone master and the like are not necessary.SOLUTION: When (A) is a linear diorganopolysiloxane including two or more aliphatic unsaturation monovalent hydrocarbon groups per one molecule, (B) is an organosilane or organosiloxane including at least two mercapto groups per one molecule, (C) is organopolysiloxane resin in three-dimentional network structure including a siloxane unit expressed as RSiO(Ris a monovalent hydrocarbon group) and a siloxane unit expressed as SiO, and (D) is photoinitiator, the micro-contact printing material comprises: cured material of photocuring type silicone rubber composition including 0.01 to 5 pts.mass of the photoinitiator (D) based on 100 pts.mass of total amount of (A), (B), and (C), and the cured material includes 200 ppm or less nonfunctional lowe-molecular-weight siloxanes Dto D.

Description

  The present invention relates to a silicone rubber plate material for microcontact printing, and more specifically, a silicone rubber plate for microcontact printing, which is cured into a rubber shape and forms a fine pattern by transferring conductive ink, semiconductor ink or the like. The present invention relates to a plate material for microcontact printing, in which a fine pattern is formed by stereolithography, and the amount of non-functional low-molecular siloxane in a cured product is extremely small, and a method for producing the same.

  In the present invention, the plate material refers to a silicone rubber material in which a fine pattern is formed by irradiating a silicone rubber composition with UV laser light by an optical modeling method.

  Conventionally, silicone rubber has been widely used in various fields by taking advantage of its excellent heat resistance, cold resistance, electrical characteristics and the like. In particular, it has attracted attention as a plate material for microcontact printing because it has good fluidity and can be reversed with good dimensional reproducibility from a master having a fine pattern. In particular, addition reaction curable liquid silicone rubber compositions have come to be frequently used in terms of dimensional reproducibility and workability. However, a master unvulcanized silicone rubber composition is cast and heat cured. In the case of the conventional addition reaction curable liquid silicone rubber that reverses the fine pattern, it depends on the master material and the dimensional accuracy.

  Specifically, a method of forming a fine pattern on a Si wafer using photolithography technology as a master is common, but currently, a commercially available Si wafer has a maximum diameter of 300 mm, so it is an A4 size. A large plate for microcontact printing such as (210 mm × 297 mm) could not be produced.

  Therefore, a method of forming a fine pattern with a resist material or the like on a glass substrate as a master has been proposed, but the pattern accuracy tends to be worse compared to a Si wafer master using a photolithography technique.

  The silicone rubber composition used as a microcontact printing plate is generally supplied in the form of a composition containing an organopolysiloxane having a high polymerization degree and a reinforcing resin. This composition is prepared by mixing a reinforcing resin and various dispersants with a raw material polymer using a mixing device such as a universal mixer or a kneader. Organopolysiloxane and reinforcing resin are electrically insulating materials, and the non-functional low-molecular siloxane component inevitably contained in the silicone rubber composition obtained by blending it and the cured silicone rubber is transferred. There is a tendency to shift to a material (a glass substrate, a plastic substrate, etc.), and to cause a decrease in conductivity or variation of the ink material due to siloxane contamination.

  Prior literature relating to the present invention is as follows, and Patent Document 2 proposes a microcontact printing plate material with a reduced content of low molecular siloxane, but the curing system is different from the present application. The manufacturing method of the present application cannot be applied. Moreover, although the photocurable silicone rubber composition is proposed by patent documents 3 and 4, it does not describe at all about reducing low molecular siloxane and applying to a printing plate for microcontact printing.

JP 2010-80865 A JP 2009-59883 A JP-A-10-95920 JP 2006-2087 A

Langmuir 19, 6104-6109 (2003) Langmuir 19, 5475-5383 (2003)

  An object of the present invention is to produce a fine pattern by a stereolithography method for a large plate for micro contact printing, and without using a master, and a material to be transferred (non-functional low molecular siloxane) (glass substrate or plastic). It is an object of the present invention to provide a microcontact printing plate material in which contamination of a substrate or the like), decrease in conductivity of ink material, and variation are suppressed.

As a result of intensive studies to achieve the above object, the present inventor made the total content of the non-functional low-molecular siloxanes D _{3 to} D ₂₀ in the cured product of the photocurable silicone rubber composition 200 ppm or less. It has been found that the above problems can be solved by using silicone rubber, and the present invention has been completed.

That is, the present invention provides the following microcontact printing plate material and a method for producing the same.
Claim 1:
(A) a linear diorganopolysiloxane containing two or more aliphatic unsaturated monovalent hydrocarbon groups in one molecule;
(B) an organosilane or organosiloxane containing at least two mercapto groups in one molecule;
(C) A siloxane unit represented by R ¹ ₃ SiO _1/2 (wherein R ¹ is independently an unsubstituted or substituted monovalent hydrocarbon group) and a siloxane represented by SiO _4/2 An organopolysiloxane resin having a three-dimensional network structure containing units;
(D) Photoinitiator (A) It consists of the hardened | cured material of the photocurable silicone rubber composition containing 0.01-5 mass parts with respect to 100 mass parts of total amounts of a component, (B), (C), microcontact printing stamp, wherein the total content of nonfunctional low-molecular-weight siloxane D ₃ to D ₂₀ is 200ppm or less in the cured product.
Claim 2:
The blending amount of the component (C) is 5 to 100 parts by weight with respect to 100 parts by weight of the component (A), and the blending amount of the component (B) is the component (A) (provided that the component (C) is aliphatic unsaturated. 2. The microcontact print according to claim 1, wherein when the group is contained, the mercapto-containing group equivalent is 0.1 to 20 with respect to the aliphatic unsaturated group supplied from the component (A) and the component (C). Plate material.
Claim 3:
(A) A linear diorganopolysiloxane containing two or more aliphatic unsaturated monovalent hydrocarbon groups in one molecule, and the total content of non-functional low-molecular siloxanes D _{3 to} D ₂₀ A diorganopolysiloxane having a content of 1,000 ppm or less,
(B) an organosilane or organosiloxane containing at least two mercapto groups in one molecule;
(C) A siloxane unit represented by R ¹ ₃ SiO _1/2 (wherein R ¹ is independently an unsubstituted or substituted monovalent hydrocarbon group) and a siloxane represented by SiO _4/2 An organopolysiloxane resin having a three-dimensional network structure containing units, wherein the total content of the non-functional low-molecular siloxanes D _{3 to} D ₂₀ is 1,000 ppm or less,
(D) The photo-initiator is a silicone rubber composition obtained by kneading 0.01 to 5 parts by mass with respect to 100 parts by mass of the total amount of the photoinitiators (A), (B), and (C). A fine pattern is formed on the surface of the silicone rubber composition, and the total content of the non-functional low-molecular siloxanes D _{3 to} D _{20 in} the cured product is 200 ppm or less. A method for producing a plate material for microcontact printing, characterized in that
Claim 4:
The blending amount of the component (C) is 5 to 100 parts by weight with respect to 100 parts by weight of the component (A), and the blending amount of the component (B) is not supplied from the components (A) and (C). The amount of the mercapto-containing group equivalent is 0.1 to 20 with respect to the saturated group, and the blending amount of the component (D) is 100 parts by weight of the total amount of the components (A), (B), and (C). It is 0.01-5 mass parts, The manufacturing method of the plate material for micro contact printing of Claim 3.
Claim 5:
The method for producing a microcontact printing plate material according to claim 3 or 4, wherein the curing is performed with light having a wavelength of 200 to 500 nm.

Since the microcontact printing plate material of the present invention is a cured product of a photocurable silicone rubber composition, the composition can be directly applied by irradiation of UV laser light by an optical modeling method without using a Si master or the like. In addition, a fine pattern can be formed on the surface of the substrate, and the total content of the non-functional low-molecular siloxanes D _{3 to} D ₂₀ is 200 ppm or less, so that contamination of the material to be transferred (glass substrate, plastic substrate, etc.) It is possible to suppress, and it is possible to suppress a decrease in conductivity and variation of the ink material due to siloxane contamination.

The plate material for microcontact printing of the present invention comprises a silicone rubber obtained by curing a photocurable silicone rubber composition by irradiation with UV laser light by an optical modeling method. In this case, as the photocurable silicone rubber composition, those containing the following components (A) to (D) are preferably used.
(A) a linear diorganopolysiloxane containing two or more aliphatic unsaturated monovalent hydrocarbon groups in one molecule;
(B) an organosilane or organosiloxane containing at least two mercapto groups in one molecule;
(C) A siloxane unit represented by R ¹ ₃ SiO _1/2 (wherein R ¹ is independently an unsubstituted or substituted monovalent hydrocarbon group) and a siloxane unit represented by SiO _4/2 An organopolysiloxane resin having a three-dimensional network structure,
(D) Photoinitiator.

  In the present invention, the (A) diorganopolysiloxane used in the present invention is a component that becomes the base polymer of the plate material. This component (A) has 2 or more, preferably 3 or more aliphatic unsaturated monovalent hydrocarbon groups bonded to a silicon atom, and can form a network structure by a curing reaction. Anything may be used.

  Examples of the aliphatic unsaturated monovalent hydrocarbon group include alkenyl groups having 2 to 6 carbon atoms such as vinyl, allyl, propenyl, 1-butenyl, and 1-hexenyl. A vinyl group is most advantageous from the viewpoint that the fluidity of the composition and the heat resistance of the composition after curing are not impaired. The content of the aliphatic unsaturated monovalent hydrocarbon group is 0.01 to 20 mol%, particularly 0.02 to 10 mol% of the substituent bonded to the silicon atom (excluding the oxygen atom forming the siloxane bond). Preferably there is.

  As the other organic group bonded to the silicon atom of the component (A), an unsubstituted or substituted monovalent hydrocarbon group having 1 to 10 carbon atoms excluding an aliphatic unsaturated monovalent hydrocarbon group is preferable, and methyl, ethyl Alkyl groups such as propyl, butyl, pentyl, hexyl, octyl, decyl, dodecyl; aryl groups such as phenyl; aralkyl groups such as benzyl, 2-phenylethyl, 2-phenylpropyl; chloromethyl, chlorophenyl, 2-cyanoethyl, Examples thereof include substituted hydrocarbon groups such as halogen substitution such as 3,3,3-trifluoropropyl and cyano substitution. Of these, a methyl group is most preferred because it is easy to synthesize and has a good balance of properties such as mechanical strength and fluidity before curing.

  The aliphatic unsaturated monovalent hydrocarbon group may be present at either the end or in the middle of the molecular chain of the (A) organopolysiloxane, or may be present at both of them, but is excellent in the composition after curing. In order to provide mechanical properties, the component (A) is a linear diorganopolysiloxane whose main chain is composed of repeating diorganosiloxane units and whose both ends are blocked with triorganosiloxy groups. It is also preferred that aliphatic unsaturated monovalent hydrocarbon groups such as alkenyl groups are present at least at both ends thereof.

The degree of polymerization of the component (A) is such that the composition before curing has good fluidity and workability, and the composition after curing has an appropriate elasticity at 25 ° C. in viscosity measurement with an Ostwald viscometer. preferably it has a viscosity of 500~500,000mm ² / s, particularly preferably from 1,000~100,000mm ² / s.

This component (A) is usually prepared by equilibrating cyclopolysiloxane with a strongly basic catalyst such as potassium hydroxide, tetraalkylammonium hydroxide, tetraalkylphosphonium hydroxide or the like, and then using these siliconate compounds. The polymer is obtained by neutralization and deactivation, and the low-molecular siloxane by-product generated at this time is usually removed by a heating strip under reduced pressure. The level of these removals depends on the economy, but currently the materials on the general commercial level have a total amount of low molecular weight compounds in which the total number of silicon atoms in the molecule is 3 to 20 in the range of thousands to tens of thousands ppm. . By reducing this low-molecular content level to 1,000 ppm or less, preferably 500 ppm or less, the non-functional low-molecular siloxanes D _{3 to} D ₂₀ (that is, diorganos such as dimethylsiloxane cyclic 3 to 20 monomers) are obtained. In the present invention, the sum of the non-functional low-molecular siloxanes D _{3 to} D ₂₀ of the component (A) is 1,000 ppm or less, and more. It is recommended to adjust to 500 ppm or less.

As the component (B), organosilane or organosiloxane containing at least 2, preferably about 2 to 50 mercapto groups in one molecule is blended. This component reacts with the aliphatic unsaturated groups of the above components (A) and (C) and acts as a crosslinking agent component for forming a cured rubber. This compound contains at least two mercapto groups (for example, a mercaptoalkyl group such as γ-mercaptopropyl group represented by — (CH ₂ ) _r —SH (r; 1-6)) in one molecule. Any of them can be used, but in order to maintain the light transmittance, a compound having a silane or siloxane bond having high compatibility with the organopolysiloxane is required.

  Specifically, examples of the silane include mercaptopropyltrimethoxysilane, mercaptopropyltriethoxysilane, and the like, and linear, cyclic or branched organopolysiloxanes represented by the following formulas. it can.

（式中、ｕは３以上、好ましくは３〜２０、特に好ましくは４〜１０の整数であり、ｘ，ｙ及びｖは０以上、好ましくは０〜５０、特に好ましくは０〜２０の整数であり、ｚ１は０以上、好ましくは０〜４８、特に好ましくは１〜１８の整数であり、ｚ２及びｗは２以上、好ましくは２〜５０、特に好ましくは３〜２０の整数である。）

(Wherein u is an integer of 3 or more, preferably 3 to 20, particularly preferably 4 to 10, and x, y and v are 0 or more, preferably 0 to 50, particularly preferably an integer of 0 to 20. And z1 is 0 or more, preferably 0 to 48, particularly preferably an integer of 1 to 18, and z2 and w are 2 or more, preferably 2 to 50, particularly preferably an integer of 3 to 20.)

  Such organosiloxanes can be used alone or as a mixture of two or more.

In addition, as described above, the component (B) is a compound having a structure containing a Q unit (a siloxane unit represented by SiO _4/2 ), although a linear compound is generally easy to synthesize as described above. For example, γ-mercaptopropyltrimethoxysilane and tetramethoxysilane may be hydrolyzed.

  The amount of the component (B) is such that the mercapto-containing group equivalent is 0.1 to 20 with respect to the aliphatic unsaturated groups supplied from the components (A) and (C), preferably 0.5. It is the quantity which becomes -4.0 equivalent. If it is less than 0.1 equivalent, curing is not sufficient, and if it exceeds 20 equivalent, too much crosslinking agent is used, and curing is still insufficient.

The (C) organopolysiloxane resin in the present invention imparts mechanical properties (strength) to the cured product of the composition, and R ¹ ₃ SiO _1/2 (wherein R ¹ is independently unsubstituted) Or a substituted monovalent hydrocarbon group) and an organopolysiloxane resin having a three-dimensional network structure containing or not containing an alkenyl group and a siloxane unit represented by SiO _4/2 It is.

In this case, the unsubstituted or substituted monovalent hydrocarbon group for R ¹ is the same as the aliphatic unsaturated monovalent hydrocarbon group and the organic group other than the aliphatic unsaturated hydrocarbon group in component (A). Is mentioned. A vinyl group and a methyl group are preferable, and at least one of R ¹ is preferably a vinyl group.

The ratio of R ¹ ₃ SiO _1/2 units to SiO _4/2 units is such that the molar ratio of R ¹ ₃ SiO _1/2 / SiO _4/2 is 0.3 to ₂ , particularly 0.7 to 1. It is preferable in terms of mechanical properties of the cured product.

In the reinforcing resin, if necessary, R ¹ ₂ SiO _2/2 units and R ¹ SiO _3/2 units (R ¹ is as described above) are added in an amount of 0 to 10 mol%, particularly 0 It may be included at a ratio of ˜5 mol%.

  The amount of component (C) is 5 to 100 parts by mass with respect to 100 parts by mass of component (A) because it gives good mechanical properties (strength) to the microcontact printing plate obtained by curing. 10 to 50 parts by mass are preferable.

  This component (C) can be produced by a known method such as a (co) hydrolysis method. As with the component (A), the component (C) is preferably reduced to a low molecular content level of 1,000 ppm or less, preferably 500 ppm or less.

  The (D) photoinitiator in the present invention reacts with light irradiation to form a three-dimensional bond, thereby forming a rubber molded product. Curing is accelerated by the radical reaction, and curing of the epoxy group or vinyl ether group proceeds by the cationic reaction. Examples of radical initiators include acetophenone, propiophenone, benzophenone, xanthol, fluorin, benzaldehyde, anthraquinone, triphenylamine, carbazole, 3-methylacetophenone, 4-methylacetophenone, 3 well known in the art. -Pentylacetophenone, 4-methoxyacetophenone, 3-bromoacetophenone, 4-allylacetophenone, p-diacetylbenzene, 3-methoxybenzophenone, 4-methylbenzophenone, 4-chlorobenzophenone, 4,4-dimethoxybenzophenone, 4-chloro- 4-benzylbenzophenone, 3-chloroxanthone, 3,9-dichloroxanthone, 3-chloro-8-nonylxanthone, benzoin, benzoin methyl ether, ben In ether, bis (4-dimethylamino phenol) ketone, benzyl methoxy ketal, 2-chlorothioxanthone tone, and the like. Examples of the cationic photopolymerization initiator include diazonium salts such as 4-morpholino-2,5-dimethoxyphenyldiazonium fluoroborate, diphenyliodonium salts of arsenic hexafluoride, octoxyphenylphenyliodonium salts of antimony hexafluoride, and the like. Known ones such as iodonium salts can be used.

  The addition amount of this component is 0.01-5 parts by mass with respect to 100 parts by mass of the total amount of component (A), component (B), and component (C). In principle, the addition of this component that absorbs light is a negative factor for the purpose of transmitting light. For this reason, the minimum amount that the present composition is cured is good for the addition of this component, and preferably 0.01% with respect to 100 parts by mass of the total amount of the (A) component, the (B) component, and the (C) component. A range of ˜0.5 parts by mass is preferred. If it is less than 0.01 part by mass, the composition itself is not cured and the mold cannot be molded. On the other hand, if the amount exceeds 5 parts by mass, the cured silicone rubber mold is inferior in light transmittance, takes a long time to cure the internal photocurable resin, and is not suitable as a light transmissive type.

  Other components can be blended in the photo-curable silicone rubber composition of the present invention within a range not impeding the characteristics of the present invention depending on the purpose. That is, if necessary, a mold release agent, pigment, plasticizer, flame retardancy imparting agent, thixotropic property imparting agent, antibacterial agent, antifungal agent and the like may be blended.

  In the photocurable silicone rubber composition of the present invention, the components (A) to (D) and other components to be blended as required are uniformly mixed by a mixing means such as a planetary mixer, a Shinagawa mixer, a universal kneader or the like. It can be prepared by kneading. The photo-curable silicone rubber composition of the present invention needs to be stored in a light-shielding container because the curing reaction proceeds by ultraviolet rays.

  The photocurable silicone rubber composition of the present invention is cured by light irradiation. In addition, the light in this invention means the active ray which can harden a photocurable silicone rubber composition. The wavelength is not limited as long as it has the ability to be photocured, but usually ultraviolet light having a wavelength of 200 to 500 nm is used, and preferably ultraviolet light having a wavelength of 300 to 400 nm. Examples of the light source that generates such light include an ultraviolet fluorescent lamp, a high-pressure mercury lamp, a metal halide lamp, and a xenon lamp, but an active ray capable of curing the photocurable liquid silicone rubber composition is used. There is no particular limitation as long as it occurs. As the light source, an ultraviolet fluorescent lamp is suitable from the viewpoint of cost and ease of handling.

  The plate material for microcontact printing of the present invention uses an optical modeling system apparatus without using a master, and designs information on a fine pattern by a three-dimensional CAD system. Based on the information, a photocurable silicone rubber composition On the other hand, a method of curing by selectively irradiating light at a position corresponding to the designed shape, forming a three-dimensional solid, and forming a fine pattern on the surface is used. As an optical modeling system apparatus, what is marketed may be used, for example, D-MEC ACCULASI SI-C1000 is mentioned.

In the present invention, the total content of the nonfunctional low-molecular siloxanes D _{3 to} D ₂₀ (organocyclosiloxane having 3 to ₂₀ silicon atoms) in the plate material, that is, the cured product of the photocurable silicone rubber composition. Is 200 ppm or less (0 to 200 ppm), particularly 150 ppm or less (0 to 150 ppm), and as described above, the cured product having an amount of non-functional low molecular siloxane of 200 ppm or less is (A), (B), ( It can be achieved by using a component in which the content of the non-functional low-molecular siloxanes D _{3 to} D ₂₀ is reduced to 1,000 ppm or less, particularly 500 ppm or less, as the component C).

In addition, as a method for reducing the content of the non-functional low molecular siloxanes D _{3 to} D ₂₀ of the components (A), (B), and (C) as described above, a solvent extraction method, a reduced pressure strip method, a thin film distillation A method or a combination of two or more of these operations is employed. In the present invention, “non-functional” means that the organic group bonded to the silicon atom is non-reactive, for example, an alkyl group, aryl group or aralkyl group, and the alkenyl group is addition-reactive. Therefore, it is not included in “non-sense”.

In addition, the amount of non-functional low molecular siloxane is measured by cutting a photo-cured silicone rubber cured product into about 2 mm ³ and extracting it in an acetone solvent for 16 hours. The acetone solvent is measured by FID gas chromatography. The identified value.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not restrict | limited to a following example. In addition, in the following example, a part shows a mass part and a viscosity is a viscosity in 25 degreeC by an Ostwald viscometer. Me represents a methyl group and Vi represents a vinyl group.

[Example 1]
Both ends are blocked with dimethylvinylsiloxy groups, the intermediate unit (that is, the repeating unit structure of the main chain) is a dimethylsiloxane unit, the viscosity is 5,000 mm ² / s by an Ostwald viscometer, and it is non-functional by vacuum strip method. 100 parts of linear dimethylpolysiloxane in which the content of molecular siloxanes D _{3 to} D ₂₀ is reduced to 350 ppm, and Vi (Me, in which the content of non-functional low molecular siloxanes D _{3 to} D ₂₀ is reduced to 450 ppm by the reduced pressure strip method. 40 parts of a vinyl group-containing methylpolysiloxane resin composed of ₂ SiO _1/2 units and SiO _4/2 units (molar ratio of Vi (Me) ₂ SiO _1/2 units to SiO _4/2 units: 0.8) Were mixed for 1 hour at room temperature in a planetary mixer to obtain a silicone compound (1). 10 parts of a mercapto group-containing organopolysiloxane represented by the following formula (1) (viscosity of 50 mm ² / s by Ostwald viscometer at 25 ° C.) and 0.2 part of 2,2-diethoxyacetophenone Composition 1 was prepared.

（ｎは上記粘度を満たす数）

(N is a number that satisfies the above viscosity)

[Comparative Example 1]
Composition 2 was prepared in the same manner as in Example 1 except that the amount of 2,2-diethoxyacetophenone was 7.0 parts.

[Comparative Example 2]
Both ends are blocked with dimethylvinylsiloxy groups, the intermediate unit (that is, the repeating unit structure of the main chain) is a dimethylsiloxane unit, and has a viscosity of 5,000 mm ² / s, and is a non-functional low-molecular siloxane D _{3 to} D ₂₀ 100 parts of linear dimethylpolysiloxane having a content of 12,000 ppm, Vi (Me) ₂ SiO _1/2 unit having a content of non-functional low molecular siloxanes D _{3 to} D ₂₀ of 30,000 ppm and SiO _{4 A} silicone compound (2) was obtained by mixing 40 parts of a vinyl group-containing methylpolysiloxane resin comprising ₂ units in a planetary mixer at room temperature for 1 hour. 10 parts of a mercapto group-containing organopolysiloxane represented by the above formula (1) (viscosity by Ostwald viscometer at 25 ° C. 50 mm ² / s) and 0.2 part of 2,2-diethoxyacetophenone were blended. Composition 3 was prepared.

About the said compositions 1-3, the sheet | seat of 2 mm thickness was created (UV energy amount; 2,000 mJ / cm < ² >), and the rubber physical property according to JISK6301 was evaluated.

  Moreover, the non-functional low molecular siloxane content of this silicone rubber was measured by FID gas chromatography.

An L / S: 5 μm pattern was produced by stereolithography using D-MEC ACCULAS SI-C1000 on this photo-curable silicone rubber composition, and microcontact was made on a polyethylene terephthalate (PET) film using silver ink. Printing was performed, and the printability was observed with a microscope.
The results are shown in Table 1.

Claims (5)

(A) a linear diorganopolysiloxane containing two or more aliphatic unsaturated monovalent hydrocarbon groups in one molecule;
(B) an organosilane or organosiloxane containing at least two mercapto groups in one molecule;
(C) A siloxane unit represented by R ¹ ₃ SiO _1/2 (wherein R ¹ is independently an unsubstituted or substituted monovalent hydrocarbon group) and a siloxane represented by SiO _4/2 An organopolysiloxane resin having a three-dimensional network structure containing units;
(D) Photoinitiator (A) It consists of the hardened | cured material of the photocurable silicone rubber composition containing 0.01-5 mass parts with respect to 100 mass parts of total amounts of a component, (B), (C), microcontact printing stamp, wherein the total content of nonfunctional low-molecular-weight siloxane D ₃ to D ₂₀ is 200ppm or less in the cured product.   The blending amount of the component (C) is 5 to 100 parts by weight with respect to 100 parts by weight of the component (A), and the blending amount of the component (B) is the component (A) (provided that the component (C) is aliphatic unsaturated. 2. The microcontact print according to claim 1, wherein when the group is contained, the mercapto-containing group equivalent is 0.1 to 20 with respect to the aliphatic unsaturated group supplied from the component (A) and the component (C). Plate material. (A) A linear diorganopolysiloxane containing two or more aliphatic unsaturated monovalent hydrocarbon groups in one molecule, and the total content of non-functional low-molecular siloxanes D _{3 to} D ₂₀ A diorganopolysiloxane having a content of 1,000 ppm or less,
(B) an organosilane or organosiloxane containing at least two mercapto groups in one molecule;
(C) A siloxane unit represented by R ¹ ₃ SiO _1/2 (wherein R ¹ is independently an unsubstituted or substituted monovalent hydrocarbon group) and a siloxane represented by SiO _4/2 An organopolysiloxane resin having a three-dimensional network structure containing units, wherein the total content of the non-functional low-molecular siloxanes D _{3 to} D ₂₀ is 1,000 ppm or less,
(D) The photo-initiator is a silicone rubber composition obtained by kneading 0.01 to 5 parts by mass with respect to 100 parts by mass of the total amount of the photoinitiators (A), (B), and (C). A fine pattern is formed on the surface of the silicone rubber composition, and the total content of the non-functional low-molecular siloxanes D _{3 to} D _{20 in} the cured product is 200 ppm or less. A method for producing a plate material for microcontact printing, characterized in that   The blending amount of the component (C) is 5 to 100 parts by weight with respect to 100 parts by weight of the component (A), and the blending amount of the component (B) is not supplied from the components (A) and (C). The amount of the mercapto-containing group equivalent is 0.1 to 20 with respect to the saturated group, and the blending amount of the component (D) is 100 parts by weight of the total amount of the components (A), (B), and (C). It is 0.01-5 mass parts, The manufacturing method of the plate material for micro contact printing of Claim 3.   The method for producing a microcontact printing plate material according to claim 3 or 4, wherein the curing is performed with light having a wavelength of 200 to 500 nm.