JP4605402B2 - Liquid silicone rubber composition for optical waveguide plate - Google Patents

Liquid silicone rubber composition for optical waveguide plate Download PDF

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JP4605402B2
JP4605402B2 JP2007138724A JP2007138724A JP4605402B2 JP 4605402 B2 JP4605402 B2 JP 4605402B2 JP 2007138724 A JP2007138724 A JP 2007138724A JP 2007138724 A JP2007138724 A JP 2007138724A JP 4605402 B2 JP4605402 B2 JP 4605402B2
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hydrosilylation
silicone rubber
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敏夫 山崎
貴雄 宇野
茂 生方
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Shin Etsu Chemical Co Ltd
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04Polysiloxanes
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04Polysiloxanes
    • C08G77/38Polysiloxanes modified by chemical after-treatment
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
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    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G02B1/045Light guides

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Description

本発明は、オルガノポリシロキサンを主成分とし、ヒドロシリル化反応によって硬化する光導波板用液状シリコーンゴム組成物に関し、特に高透明、高硬度の成型物が得られるため、携帯電話のキーパッド照光用バックライト装置の光導波板に好適に用いられるものである。   The present invention relates to a liquid silicone rubber composition for an optical waveguide plate, which is mainly composed of an organopolysiloxane and is cured by a hydrosilylation reaction. Particularly, a highly transparent and high-hardness molded product can be obtained. It is suitably used for an optical waveguide plate of a backlight device.

携帯電話の夜間使用のため、多くのキーパッドは照光用バックライト装置を備えているが、従来は発光ダイオード(LED)をキーパッドの裏側に多数個配置する構成であった。しかし、最近の携帯電話の高機能化に伴い、照光用バックライト装置にも薄型化、軽量化、高輝度化、コストダウンの要求が高まっており、液晶ディスプレイ(LCD)でも採用されている光導波板による照光用バックライト装置が提案された。これは、LED光源と、該光源に対向する端面から光を内部に導入して拡散し、照光したいキー部分に設置した反射面で光を反射して反射光を外部に投射する光導波板から構成されている(特許文献1:特開2003−59321号公報参照)。この装置の特徴は、LEDを横方向に設置することで薄型化が可能になり、従来の裏側にLEDを設置したタイプに比べてLED個数を減少してもキーパッド全面を均一に、高輝度に照光可能となった。また、消費電力も低下したので電池の小型、軽量化も進み、低コスト化にも寄与した。   Many keypads are equipped with an illumination backlight device for night use of mobile phones, but in the past, a large number of light emitting diodes (LEDs) are arranged on the back side of the keypad. However, along with the recent enhancement of functions of mobile phones, there are increasing demands for thinner, lighter, higher brightness, and lower cost lighting backlight devices, and the light used in liquid crystal displays (LCDs). A backlight device for illuminating with corrugated plates has been proposed. This is from an LED light source and an optical waveguide plate that diffuses light by introducing it into the interior from the end face facing the light source, and reflects the light at the reflective surface installed at the key part to be illuminated and projects the reflected light to the outside. (See Patent Document 1: Japanese Patent Laid-Open No. 2003-59321). The feature of this device is that it can be thinned by installing LEDs in the horizontal direction, and even if the number of LEDs is reduced compared to the conventional type with LEDs installed on the back side, the entire keypad is uniformly brightened. It became possible to illuminate. In addition, the power consumption has been reduced, so the battery has become smaller and lighter, contributing to lower costs.

LCDバックライト装置の光導波板は、光学的特性のみを要求されるが、キーパッド照光用バックライト装置の光導波板は、キー入力の変位(クリック)をスイッチング素子に伝達する役目も担うので、高透明であることに加え、弾性やその温度依存性が小さいこと、薄く均一な厚みで表面平滑なフィルムを成型できること等も必要となる。一般にアクリル樹脂やポリカーボネート樹脂は高透明でフィルム成型性は良好であるが、弾性の温度依存性、特に低温領域では脆化のため、キー入力時にクラックが発生することがあった。そこで、LEDの封止材等の光学材料にも応用されている高透明なシリコーン系樹脂(特許文献2:特開2002−265787号公報、特許文献3:特開2006−202952号公報、特許文献4:特開2006−342200号公報参照)が低温特性に優れている点で注目された。中でも、シリカを全く含まないために高透明、かつ低温でも弾性を損なわず、熱硬化によるフィルム成型も比較的容易なヒドロシリル化硬化型液状シリコーンゴム組成物の硬化物がキーパッド照光用バックライト装置の光導波板として採用されるようになった。   The optical waveguide plate of the LCD backlight device is required only for optical characteristics, but the optical waveguide plate of the backlight device for keypad illumination also plays a role of transmitting displacement (click) of key input to the switching element. In addition to being highly transparent, it is also necessary that the elasticity and its temperature dependence are small, and that a thin film with a uniform surface thickness can be formed. In general, acrylic resins and polycarbonate resins are highly transparent and have good film moldability, but cracking may occur during key input due to temperature dependence of elasticity, particularly embrittlement in the low temperature region. Therefore, highly transparent silicone resins that are also applied to optical materials such as LED sealing materials (Patent Document 2: Japanese Patent Laid-Open No. 2002-265787, Patent Document 3: Japanese Patent Laid-Open No. 2006-202952, Patent Document) 4: Japanese Patent Laid-Open No. 2006-342200) was noted because of its excellent low-temperature characteristics. Among them, a cured product of a hydrosilylation-curable liquid silicone rubber composition that is highly transparent because it does not contain silica at all, does not impair elasticity even at low temperatures, and is relatively easy to form by heat curing, is a backlight device for keypad illumination. As an optical waveguide plate, it has been adopted.

しかし、補強材としてのシリカを全く含まないシリコーンゴムは、一般に強度がなくて柔らかく、表面粘着性を有するためフィルム成型に適さない。架橋密度を上げると強度と硬さが向上し、粘着性も小さくなるため、フィルム成型性は改善されるが、可撓性のない脆いフィルムになってしまう。   However, silicone rubber containing no silica as a reinforcing material is generally not strong and soft, and is not suitable for film molding because of its surface adhesiveness. When the crosslink density is increased, strength and hardness are improved, and adhesiveness is also reduced. Therefore, film moldability is improved, but a brittle film having no flexibility is obtained.

特開2003−59321号公報JP 2003-59321 A 特開2002−265787号公報JP 2002-265787 A 特開2006−202952号公報JP 2006-202952 A 特開2006−342200号公報JP 2006-342200 A

本発明は上記事情に鑑みなされたもので、補強材としてのシリカを全く含まない高透明なヒドロシリル化硬化型液状シリコーンゴム組成物であって、硬さと可撓性を両立させた硬化物を形成することができ、特にバックライト装置用として好適な光導波板用ヒドロシリル化硬化型液状シリコーンゴム組成物を提供することを目的とする。   The present invention has been made in view of the above circumstances, and is a highly transparent hydrosilylation-curable liquid silicone rubber composition that does not contain silica as a reinforcing material, and forms a cured product that has both hardness and flexibility. It is an object of the present invention to provide a hydrosilylation-curable liquid silicone rubber composition for an optical waveguide plate that is particularly suitable for a backlight device.

本発明者らは、上記目的を達成するために鋭意検討を重ねた結果、硬化物の硬さを発現させるためのシリコーン樹脂と可撓性を付与させるための生ゴム状オルガノポリシロキサンとを併用したヒドロシリル化硬化型液状シリコーンゴム組成物とすることにより、硬化後の成型フィルムの硬さと可撓性の両立が可能であることを見出し、本発明に至ったものである。   As a result of intensive studies to achieve the above object, the present inventors have used a silicone resin for expressing the hardness of a cured product and a raw rubber-like organopolysiloxane for imparting flexibility. It has been found that by using a hydrosilylation-curable liquid silicone rubber composition, it is possible to achieve both the hardness and flexibility of the molded film after curing, and the present invention has been achieved.

即ち、本発明は、
(A)R3SiO1/2単位(M単位)、SiO4/2単位(Q単位)、R2SiO2/2単位(D単位)、及びRSiO3/2単位(T単位)から選択される単位からなり、これらの全構成単位のうちM単位及びQ単位の合計量が80mol%以上であり、かつQ単位に対するM単位のモル比が0.5〜1.5の範囲であるシリコーン樹脂
100質量部
(ここで、Rは炭素数1〜6の一価炭化水素基であり、かつ一分子中の少なくとも2個はアルケニル基である。)
(B)平均重合度が2,000以下で、かつ分子中のケイ素原子数が4個以上であり、一分子中に少なくとも2個のケイ素原子と結合したアルケニル基を含有する、主鎖がジオルガノシロキサン単位(D単位)の繰り返しからなり分子鎖両末端がトリオルガノシロキシ基(M単位)で封鎖された直鎖状オルガノポリシロキサン
50〜200質量部
(C)平均重合度が2,000を超えかつ100,000以下である、一分子中に少なくとも2個のケイ素原子と結合したアルケニル基を含有する室温で生ゴム状のオルガノポリシロキサン
1〜50質量部
(D)一分子中に少なくとも2個のケイ素原子と結合した水素原子を含有するオルガノハイドロジェンポリシロキサン
(A),(B)成分及び(C)成分中のケイ素原子と
結合したアルケニル基1個当たり、ケイ素原子に
結合した水素原子の数が1.0〜10.0個となる量
(E)ヒドロシリル化反応触媒 触媒量
を必須成分とすることを特徴とする光導波板用ヒドロシリル化硬化型液状シリコーンゴム組成物
を提供する。
That is, the present invention
(A) selected from R 3 SiO 1/2 unit (M unit), SiO 4/2 unit (Q unit), R 2 SiO 2/2 unit (D unit), and RSiO 3/2 unit (T unit) A silicone resin in which the total amount of M units and Q units is 80 mol% or more, and the molar ratio of M units to Q units is in the range of 0.5 to 1.5.
100 parts by mass (wherein R is a monovalent hydrocarbon group having 1 to 6 carbon atoms, and at least two in one molecule are alkenyl groups)
(B) The average degree of polymerization is 2,000 or less, the number of silicon atoms in the molecule is 4 or more, and the main chain contains an alkenyl group bonded to at least two silicon atoms in one molecule. Linear organopolysiloxane consisting of repeating organosiloxane units (D units), with both ends of the molecular chain blocked with triorganosiloxy groups (M units)
50 to 200 parts by weight (C) an average polymerization degree of Ru der and 100,000 than 2,000, at least two room temperature gum of containing bonded alkenyl groups and silicon atoms organo per molecule Polysiloxane
1 to 50 parts by mass (D) Organohydrogenpolysiloxane containing hydrogen atoms bonded to at least two silicon atoms in one molecule
(A), (B) component and (C) silicon atom in component and
Per bonded alkenyl group to a silicon atom
Amount (E) hydrosilylation reaction catalyst in which the number of bonded hydrogen atoms is 1.0-10.0. A hydrosilylation-curable liquid silicone rubber composition for optical waveguide plates, characterized in that the catalyst amount is an essential component. I will provide a.

本発明のヒドロシリル化硬化型液状シリコーンゴム組成物の硬化物フィルムは、高透明で高硬度、かつ可撓性を備えたものであるので、携帯電話のキーパッド照光用バックライト装置の光導波板として最適である。   Since the cured film of the hydrosilylation-curable liquid silicone rubber composition of the present invention has high transparency, high hardness, and flexibility, an optical waveguide plate for a backlight device for keypad illumination of a mobile phone As best.

以下に、本発明を更に詳細に説明する。
本発明のヒドロシリル化硬化型液状シリコーンゴム組成物の(A)成分のシリコーン樹脂は、R3SiO1/2単位(M単位)、SiO4/2単位(Q単位)、R2SiO2/2単位(D単位)、及びRSiO3/2単位(T単位)から選択される単位からなり、これらの全構成単位のうちM単位及びQ単位の合計量が80mol%以上であり、かつQ単位に対するM単位のモル比が0.5〜1.5の範囲である、分岐状又は三次元網状構造のものである。ここで、Rは炭素数1〜6の一価炭化水素基であり、かつ一分子中の少なくとも2個はアルケニル基である。
Hereinafter, the present invention will be described in more detail.
The silicone resin of component (A) of the hydrosilylation curable liquid silicone rubber composition of the present invention is composed of R 3 SiO 1/2 units (M units), SiO 4/2 units (Q units), R 2 SiO 2/2. A unit selected from a unit (D unit) and an RSiO 3/2 unit (T unit), and the total amount of M units and Q units among these structural units is 80 mol% or more, and is based on Q units It has a branched or three-dimensional network structure in which the molar ratio of M units is in the range of 0.5 to 1.5. Here, R is a monovalent hydrocarbon group having 1 to 6 carbon atoms, and at least two in one molecule are alkenyl groups.

上記シリコーン樹脂の炭素数1〜6の一価炭化水素基Rの具体例としては、メチル基、エチル基、プロピル基、ブチル基、ペンチル基、ヘキシル基等のアルキル基、ビニル基、アリル基、ブテニル基、ペンテニル基、ヘキセニル基等のアルケニル基、シクロヘキシル基、シクロヘキセニル基、並びにフェニル基等の非置換の一価炭化水素基、3,3,3−トリフルオロプロピル基、シアノメチル基等の上記一価炭化水素基の水素原子の少なくとも一部がハロゲン原子やシアノ基で置換された置換アルキル基等の置換の一価炭化水素基が挙げられ、(A)成分のシリコーン樹脂に含まれる複数のRは同じでも異なってもよいが、ヒドロシリル化硬化型液状シリコーンゴム組成物の他の成分との相溶性の観点から、Rの80mol%以上がメチル基であることが好ましい。各成分の相溶性が悪化すると、ヒドロシリル化硬化型液状シリコーンゴム組成物の硬化物の透明性が低下するためである。また、アルケニル基としてはビニル基が好ましいが、これも他の成分との相溶性を保つことが理由である。   Specific examples of the monovalent hydrocarbon group R having 1 to 6 carbon atoms of the silicone resin include alkyl groups such as methyl group, ethyl group, propyl group, butyl group, pentyl group, and hexyl group, vinyl group, allyl group, Alkenyl group such as butenyl group, pentenyl group, hexenyl group, cyclohexyl group, cyclohexenyl group, and unsubstituted monovalent hydrocarbon group such as phenyl group, 3,3,3-trifluoropropyl group, cyanomethyl group, etc. Examples include a substituted monovalent hydrocarbon group such as a substituted alkyl group in which at least a part of hydrogen atoms of the monovalent hydrocarbon group is substituted with a halogen atom or a cyano group. R may be the same or different, but from the viewpoint of compatibility with other components of the hydrosilylation-curable liquid silicone rubber composition, 80 mol% or more of R is methyl It is preferable that. This is because when the compatibility of each component deteriorates, the transparency of the cured product of the hydrosilylation-curable liquid silicone rubber composition decreases. The alkenyl group is preferably a vinyl group, which is also because it maintains compatibility with other components.

上記の(A)成分のシリコーン樹脂において、上記四種の構成単位のうちR3SiO1/2単位(M単位)とSiO4/2単位(Q単位)は必須であり、ヒドロシリル化硬化型液状シリコーンゴム組成物の硬化物の硬さを向上させるためには、全構成単位に占めるこの2種の構成単位の割合が80mol%以上であることが必要であり、好ましくは90mol%以上、より好ましくは100mol%である。R2SiO2/2単位(D単位)及びRSiO3/2単位(T単位)は含まれていてもいなくてもよい。 In the silicone resin of component (A), R 3 SiO 1/2 unit (M unit) and SiO 4/2 unit (Q unit) are essential among the above four types of structural units, and hydrosilylation-curable liquid In order to improve the hardness of the cured product of the silicone rubber composition, it is necessary that the proportion of these two types of structural units in the total structural units is 80 mol% or more, preferably 90 mol% or more, more preferably Is 100 mol%. R 2 SiO 2/2 units (D units) and RSiO 3/2 units (T units) may or may not be included.

また、SiO4/2単位(Q単位)に対するR3SiO1/2単位(M単位)のモル比が0.5より小さいと、ヒドロシリル化硬化型液状シリコーンゴム組成物の他の成分との相溶性が悪化し、1.5よりも大きいとヒドロシリル化硬化型液状シリコーンゴム組成物の硬化物の硬さが低下してしまう。従ってQ単位に対するM単位のモル比は0.5〜1.5の範囲にあることが必要とされ、好ましくは0.7〜1.2の範囲である。 When the molar ratio of R 3 SiO 1/2 unit (M unit) to SiO 4/2 unit (Q unit) is smaller than 0.5, the phase with other components of the hydrosilylation-curable liquid silicone rubber composition If the solubility deteriorates and is greater than 1.5, the hardness of the cured product of the hydrosilylation-curable liquid silicone rubber composition will decrease. Therefore, the molar ratio of M unit to Q unit is required to be in the range of 0.5 to 1.5, and preferably in the range of 0.7 to 1.2.

上記の(A)成分のシリコーン樹脂として具体的には、ビニルジメチルシロキシ基とQ単位の共重合体、ビニルジメチルシロキシ基・トリメチルシロキシ基とQ単位の共重合体、ビニルジメチルシロキシ基・ジメチルシロキサン単位とQ単位の共重合体、ビニルジメチルシロキシ基・フェニルシルセスキオキサン単位とQ単位の共重合体、ビニルジメチルシロキシ基・ジメチルシロキサン単位・フェニルシルセスキオキサン単位とQ単位の共重合体、トリメチルシロキシ基・ビニルメチルシロキサン単位とQ単位の共重合体等が挙げられる。   Specific examples of the silicone resin of the component (A) include a copolymer of vinyldimethylsiloxy group and Q unit, a copolymer of vinyldimethylsiloxy group / trimethylsiloxy group and Q unit, vinyldimethylsiloxy group / dimethylsiloxane. Copolymer of unit and Q unit, copolymer of vinyldimethylsiloxy group / phenylsilsesquioxane unit and Q unit, copolymer of vinyldimethylsiloxy group / dimethylsiloxane unit / phenylsilsesquioxane unit and Q unit And a copolymer of trimethylsiloxy group / vinylmethylsiloxane unit and Q unit.

本発明のヒドロシリル化硬化型液状シリコーンゴム組成物の(B)成分の室温で液状のオルガノポリシロキサンは、平均重合度が2,000以下で、一分子中に少なくとも2個のケイ素原子と結合したアルケニル基を含有するもので、通常、ヒドロシリル化硬化型液状シリコーンゴム組成物のベースポリマーとして使用されている公知のものであり、25℃での粘度が1〜100Pa・s、好ましくは5〜100Pa・sの粘度を有するものである。   The organopolysiloxane which is liquid at room temperature as the component (B) of the hydrosilylation-curable liquid silicone rubber composition of the present invention has an average degree of polymerization of 2,000 or less and is bonded to at least two silicon atoms in one molecule. It contains an alkenyl group and is a known polymer that is usually used as a base polymer for hydrosilylation-curable liquid silicone rubber compositions, and has a viscosity at 25 ° C. of 1 to 100 Pa · s, preferably 5 to 100 Pa. -It has a viscosity of s.

また、本発明のヒドロシリル化硬化型液状シリコーンゴム組成物の(C)成分の室温で生ゴム状のオルガノポリシロキサンは、平均重合度が2,000以上を超える、一分子中に少なくとも2個のケイ素原子と結合したアルケニル基を含有するもので、通常、ミラブルタイプのシリコーンゴムコンパウンドのベースポリマーとして使用されている公知のものである。平均重合度は、好ましくは2,100〜100,000、より好ましくは3,000〜10,000である。   The raw rubber organopolysiloxane (C) of the hydrosilylation-curable liquid silicone rubber composition of the present invention at room temperature has an average degree of polymerization exceeding 2,000 or more, and at least two silicon atoms in one molecule. It contains an alkenyl group bonded to an atom, and is a known one usually used as a base polymer for a millable type silicone rubber compound. The average degree of polymerization is preferably 2,100 to 100,000, more preferably 3,000 to 10,000.

(B)成分、(C)成分の平均重合度は、例えば、ゲルパーミエーションクロマトグラフィ(GPC)分析におけるポリスチレン換算による重量平均分子量から算出される平均値(重量平均重合度)等を適用することができる。   For the average degree of polymerization of the component (B) and the component (C), for example, an average value (weight average degree of polymerization) calculated from a weight average molecular weight in terms of polystyrene in gel permeation chromatography (GPC) analysis may be applied. it can.

上記の(B)成分、(C)成分は共にアルケニル基含有オルガノポリシロキサンであるが、違いは分子量(重合度)だけである。これらは通常、下記平均組成式(I)
1 aSiO(4-a)/2 (I)
(ここで、R1は炭素数1〜6の置換又は非置換の一価炭化水素基で、具体例としてはメチル基、エチル基、プロピル基、ブチル基、ペンチル基、ヘキシル基等のアルキル基、ビニル基、アリル基、ブテニル基、ペンテニル基、ヘキセニル基等のアルケニル基、シクロヘキシル基、シクロヘキセニル基、フェニル基等の非置換の一価炭化水素基、3,3,3−トリフルオロプロピル基、シアノメチル基等の上記一価炭化水素基の水素原子の少なくとも一部がハロゲン原子やシアノ基で置換された置換アルキル基等の置換の一価炭化水素基である。複数の置換基は異なっていても同一であってもよいが、分子中にアルケニル基を2個以上含んでいることが必要である。また、aは1.9〜2.4、好ましくは1.95〜2.05の範囲の数である。)
で表され、直鎖状であっても分岐していてもよい。好ましくは主鎖がジオルガノポリシロキサン単位(D単位)の繰り返しからなり、分子鎖両末端がトリオルガノシロキシ基(M単位)で封鎖された直鎖状オルガノポリシロキサンであるものが例示され、ケイ素原子に結合した置換基はメチル基又はフェニル基が好ましい。また、一分子中に2個以上含有することが必須であるケイ素原子と結合したアルケニル基はビニル基が好ましく、これは分子鎖末端にあっても側鎖にあってもよいが、両末端に2個含有するものが好ましい。
Both the component (B) and the component (C) are alkenyl group-containing organopolysiloxanes, but the only difference is the molecular weight (degree of polymerization). These are usually the following average composition formula (I)
R 1 a SiO (4-a) / 2 (I)
(Here, R 1 is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 6 carbon atoms, and specific examples include alkyl groups such as methyl, ethyl, propyl, butyl, pentyl, and hexyl groups. , Vinyl groups, allyl groups, butenyl groups, pentenyl groups, hexenyl groups and other alkenyl groups, cyclohexyl groups, cyclohexenyl groups, phenyl groups and other unsubstituted monovalent hydrocarbon groups, 3,3,3-trifluoropropyl groups A substituted monovalent hydrocarbon group such as a substituted alkyl group in which at least a part of the hydrogen atoms of the monovalent hydrocarbon group such as a cyanomethyl group is substituted with a halogen atom or a cyano group. However, it is necessary that the molecule contains two or more alkenyl groups, and a is from 1.9 to 2.4, preferably from 1.95 to 2.05. Number of ranges .)
It may be linear or branched. Preferably, the main chain is composed of repeating diorganopolysiloxane units (D units), and both ends of the molecular chain are linear organopolysiloxanes blocked with triorganosiloxy groups (M units). The substituent bonded to the atom is preferably a methyl group or a phenyl group. Further, the alkenyl group bonded to the silicon atom, which is essential to be contained in two or more in one molecule, is preferably a vinyl group, which may be at the molecular chain end or at the side chain, Those containing two are preferred.

本発明のヒドロシリル化硬化型液状シリコーンゴム組成物の硬化後の成型フィルムの硬さと可撓性を両立させるため、(A)成分100質量部に対し、(B)成分は50〜200質量部、(C)成分は1〜50質量部の範囲が好適である。(B)成分、(C)成分ともにこの範囲未満の組成では可撓性のない脆いフィルムとなり、逆にこの範囲を超える組成では柔らかくて表面粘着性のあるフィルムとなるため適さない。好ましくは、(A)成分100質量部に対し、(B)成分は80〜150質量部、(C)成分は5〜20質量部である。   In order to achieve both the hardness and flexibility of the molded film after curing of the hydrosilylation-curable liquid silicone rubber composition of the present invention, (B) component is 50 to 200 parts by mass with respect to (A) component 100 parts by mass, The component (C) is preferably in the range of 1 to 50 parts by mass. Components (B) and (C) that are less than this range are not suitable because they are brittle films that are not flexible, while compositions that exceed this range are soft and have a surface-adhesive film. Preferably, (B) component is 80-150 mass parts and (C) component is 5-20 mass parts with respect to 100 mass parts of (A) component.

本発明のヒドロシリル化硬化型液状シリコーンゴム組成物の(D)成分のオルガノハイドロジェンポリシロキサンは、一分子中に少なくとも2個のケイ素原子と結合した水素原子(SiH基)を含有するもので、下記平均組成式(II)
2 bcSiO(4-b-c)/2 (II)
(ここで、R2は炭素数1〜6の置換又は非置換の一価炭化水素基で、好ましくは脂肪族不飽和結合を有さないものである。具体例としてはメチル基、エチル基、プロピル基、ブチル基、ペンチル基、ヘキシル基等のアルキル基、シクロヘキシル基、シクロヘキセニル基、フェニル基等の非置換の一価炭化水素基、3,3,3−トリフルオロプロピル基、シアノメチル基等の上記一価炭化水素基の水素原子の少なくとも一部がハロゲン原子やシアノ基で置換された置換アルキル基等の置換の一価炭化水素基である。bは0.7〜2.1、cは0.18〜1.0、かつb+cは0.8〜3.0、好ましくはbは0.8〜2.0、cは0.2〜1.0、かつb+cは1.0〜2.5を満足する正数で示される。)
で示される従来から公知のオルガノハイドロジェンポリシロキサンが適用可能である。また、オルガノハイドロジェンポリシロキサンの分子構造は、直鎖状、環状、分岐状、三次元網目状のいずれの構造であってもよい。この場合、一分子中のケイ素原子の数(又は重合度)は2〜300個、特に4〜200個程度の室温で液状のものが好適に用いられる。なお、ケイ素原子に結合する水素原子(SiH基)は分子鎖末端にあっても側鎖にあっても、その両方にあってもよく、一分子中に少なくとも2個(通常2〜300個)、好ましくは3個以上(例えば3〜200個)、より好ましくは4〜150個程度含有するものが使用される。
The organohydrogenpolysiloxane of component (D) of the hydrosilylation-curable liquid silicone rubber composition of the present invention contains hydrogen atoms (SiH groups) bonded to at least two silicon atoms in one molecule. The following average composition formula (II)
R 2 b H c SiO (4-bc) / 2 (II)
(Here, R 2 is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 6 carbon atoms, and preferably has no aliphatic unsaturated bond. Specific examples include a methyl group, an ethyl group, Alkyl groups such as propyl group, butyl group, pentyl group and hexyl group, unsubstituted monovalent hydrocarbon groups such as cyclohexyl group, cyclohexenyl group and phenyl group, 3,3,3-trifluoropropyl group, cyanomethyl group, etc. And b is a substituted monovalent hydrocarbon group such as a substituted alkyl group in which at least a part of the hydrogen atoms of the monovalent hydrocarbon group is substituted with a halogen atom or a cyano group. Is 0.18 to 1.0, and b + c is 0.8 to 3.0, preferably b is 0.8 to 2.0, c is 0.2 to 1.0, and b + c is 1.0 to 2. It is indicated by a positive number satisfying .5.)
A conventionally known organohydrogenpolysiloxane represented by the formula is applicable. Further, the molecular structure of the organohydrogenpolysiloxane may be any of linear, cyclic, branched, and three-dimensional network structures. In this case, the number of silicon atoms in one molecule (or the degree of polymerization) is preferably 2 to 300, particularly about 4 to 200 at room temperature. In addition, the hydrogen atom (SiH group) bonded to the silicon atom may be at the end of the molecular chain, at the side chain, or both, and at least two (usually 2 to 300) per molecule. Preferably, those containing 3 or more (for example, 3 to 200), more preferably about 4 to 150 are used.

上記の(D)成分のオルガノハイドロジェンポリシロキサンとして具体的には、1,1,3,3−テトラメチルジシロキサン、1,3,5,7−テトラメチルシクロテトラシロキサン、メチルハイドロジェンシクロポリシロキサン、メチルハイドロジェンシロキサン・ジメチルシロキサン環状共重合体、トリス(ジメチルハイドロジェンシロキシ)メチルシラン、トリス(ジメチルハイドロジェンシロキシ)フェニルシラン、両末端トリメチルシロキシ基封鎖メチルハイドロジェンポリシロキサン、両末端トリメチルシロキシ基封鎖ジメチルシロキサン・メチルハイドロジェンシロキサン共重合体、両末端ジメチルハイドロジェンシロキシ基封鎖ジメチルポリシロキサン、両末端ジメチルハイドロジェンシロキシ基封鎖ジメチルシロキサン・メチルハイドロジェンシロキサン共重合体、両末端トリメチルシロキシ基封鎖メチルハイドロジェンシロキサン・ジフェニルシロキサン共重合体、両末端トリメチルシロキシ基封鎖メチルハイドロジェンシロキサン・ジフェニルシロキサン・ジメチルシロキサン共重合体、環状メチルハイドロジェンポリシロキサン、環状メチルハイドロジェンシロキサン・ジメチルシロキサン共重合体、環状メチルハイドロジェンシロキサン・ジフェニルシロキサン・ジメチルシロキサン共重合体、(CH32HSiO1/2単位とSiO4/2単位とから成る共重合体、(CH32HSiO1/2単位とSiO4/2単位と(C65)SiO3/2単位とからなる共重合体等や上記各例示化合物において、メチル基の一部又は全部がエチル基、プロピル基等の他のアルキル基やフェニル基等のアリール基で置換されたものなどが挙げられる。 Specific examples of the organohydrogenpolysiloxane of component (D) include 1,1,3,3-tetramethyldisiloxane, 1,3,5,7-tetramethylcyclotetrasiloxane, and methylhydrogencyclopolysiloxane. Siloxane, methylhydrogensiloxane-dimethylsiloxane cyclic copolymer, tris (dimethylhydrogensiloxy) methylsilane, tris (dimethylhydrogensiloxy) phenylsilane, trimethylsiloxy group-blocked methylhydrogenpolysiloxane, trimethylsiloxy group at both ends Blocked dimethylsiloxane / methylhydrogensiloxane copolymer, dimethylhydrogensiloxy group-blocked dimethylpolysiloxane at both ends, dimethylhydrogensiloxy group-blocked dimethylsiloxane at both ends Tyrhydrogensiloxane copolymer, trimethylsiloxy group-capped methylhydrogensiloxane / diphenylsiloxane copolymer, trimethylsiloxy group-capped methylhydrogensiloxane / diphenylsiloxane / dimethylsiloxane copolymer, cyclic methylhydrogenpolypropylene Siloxane, Cyclic methylhydrogensiloxane / dimethylsiloxane copolymer, Cyclic methylhydrogensiloxane / Diphenylsiloxane / Dimethylsiloxane copolymer, Copolymer consisting of (CH 3 ) 2 HSiO 1/2 units and SiO 4/2 units In a copolymer, a copolymer comprising (CH 3 ) 2 HSiO 1/2 units, SiO 4/2 units, and (C 6 H 5 ) SiO 3/2 units, etc. All other groups such as ethyl and propyl Examples thereof include those substituted with an aryl group such as a kill group and a phenyl group.

(D)成分の配合量については、本発明のヒドロシリル化硬化型液状シリコーンゴム組成物の硬化後の成型フィルムの硬さと可撓性を両立させるため、(A)成分、(B)成分及び(C)成分中のケイ素原子と結合したアルケニル基1個当たり、ケイ素原子に結合した水素原子の数が1.0〜10.0、好ましくは1.5〜5.0の範囲となるように(D)成分の量を調整する必要がある。この範囲未満では柔らかく、表面粘着性のあるフィルムとなり、この範囲を超えると可撓性のないフィルムとなる。   About the compounding quantity of (D) component, in order to make the hardness and flexibility of the molding film after hardening of the hydrosilylation curable liquid silicone rubber composition of this invention compatible, (A) component, (B) component, and ( C) The number of hydrogen atoms bonded to the silicon atom per alkenyl group bonded to the silicon atom in the component is in the range of 1.0 to 10.0, preferably 1.5 to 5.0 ( D) The amount of the component needs to be adjusted. If it is less than this range, it will become a soft and surface-adhesive film, and if it exceeds this range, it will become a film with no flexibility.

本発明のヒドロシリル化硬化型液状シリコーンゴム組成物の(E)成分のヒドロシリル化反応触媒は、公知のものが適用可能で、例えば、白金黒、塩化第二白金、塩化白金酸、塩化白金酸と一価アルコールとの反応物、塩化白金酸とオレフィン類との錯体、白金ビスアセトアセテート等の白金系触媒、パラジウム系触媒、ロジウム系触媒等が挙げられる。なお、このヒドロシリル化反応触媒の配合量は触媒量とすることができ、通常、白金族金属として(A)成分に対し、0.5〜1,000ppm、好ましくは1〜200ppm程度である。   As the hydrosilylation reaction catalyst of the component (E) of the hydrosilylation-curable liquid silicone rubber composition of the present invention, known catalysts can be applied, such as platinum black, platinous chloride, chloroplatinic acid, chloroplatinic acid, and the like. Examples include reactants with monohydric alcohols, complexes of chloroplatinic acid and olefins, platinum-based catalysts such as platinum bisacetoacetate, palladium-based catalysts, and rhodium-based catalysts. In addition, the compounding quantity of this hydrosilylation reaction catalyst can be made into a catalyst quantity, and is about 0.5-1,000 ppm normally with respect to (A) component as a platinum group metal, Preferably it is about 1-200 ppm.

本発明のヒドロシリル化硬化型液状シリコーンゴム組成物には、本発明の効果を損なわない範囲で、アルコキシシリル基を含有するアルコキシシラン系化合物、シランカップリング剤、チタン系やジルコニウム系等の縮合触媒等を架橋補助剤として配合してもよい。   The hydrosilylation curable liquid silicone rubber composition of the present invention includes an alkoxysilane-based compound containing an alkoxysilyl group, a silane coupling agent, a titanium-based or zirconium-based condensation catalyst within a range that does not impair the effects of the present invention. Etc. may be blended as a crosslinking aid.

また、例えば、1,3,5,7−テトラメチル−1,3,5,7−テトラビニルシクロテトラシロキサンや1,3,5−トリアリル−1,3,5−トリアジン−2,4,6−(1H,3H,5H)−トリオン(トリアリルイソシアヌレート)等の多官能アルケニル化合物、1−エチニルシクロヘキサノール、3,5−ジメチル−1−ヘキシン−3−オール等のアセチレンアルコール誘導体等のヒドロシリル化反応抑制剤を、ポットライフの確保のために添加してもよいし、例えば、トリメチルクロロシランやオクタメチルテトラシクロシロキサンで表面処理した処理シリカ等の無機充填材を、硬化物の硬さや強度を向上させるために配合してもよい。更に染料、顔料、難燃剤、離型剤等の配合も、本発明の効果を損なわない範囲ならば可能である。
これらの各任意成分は、1種単独で用いても2種以上を併用してもよい。
Also, for example, 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane and 1,3,5-triallyl-1,3,5-triazine-2,4,6 Hydrosilyl such as polyfunctional alkenyl compounds such as-(1H, 3H, 5H) -trione (triallyl isocyanurate), acetylene alcohol derivatives such as 1-ethynylcyclohexanol and 3,5-dimethyl-1-hexyn-3-ol A chemical reaction inhibitor may be added to ensure pot life. For example, an inorganic filler such as treated silica surface-treated with trimethylchlorosilane or octamethyltetracyclosiloxane may be used to increase the hardness and strength of the cured product. You may mix | blend in order to improve. Furthermore, it is possible to add dyes, pigments, flame retardants, release agents and the like as long as the effects of the present invention are not impaired.
Each of these optional components may be used alone or in combination of two or more.

本発明のヒドロシリル化硬化型液状シリコーンゴム組成物は、通常の混合攪拌器、混練器等を用いて上記の各成分を均一に混合することにより調製することができる。   The hydrosilylation-curable liquid silicone rubber composition of the present invention can be prepared by uniformly mixing the above components using a normal mixing stirrer, kneader, or the like.

本発明のヒドロシリル化硬化型液状シリコーンゴム組成物の硬化物からなるバックライト装置用光導波板は、各成分を均一に混合した上記のヒドロシリル化硬化型液状シリコーンゴム組成物を80〜350℃、好ましくは100〜200℃、より好ましくは120〜150℃で加熱硬化することにより得られる。成型法は公知の熱硬化樹脂によるフィルム成型法を用いることができ、例えばプレス成型法ならば、2枚の樹脂フィルム(ライナー)の間に本発明のヒドロシリル化硬化型液状シリコーンゴム組成物を流し込み、所定の金型、条件で加圧加硫させればよい。また延伸成型法の例としては、2枚の連続樹脂フィルムの間に本発明のヒドロシリル化硬化型液状シリコーンゴム組成物を供給しながらロールにより一定厚みに延伸し、加熱炉に連続的に供給して常圧熱気加硫させる。硬化後、冷却してからライナーを剥離すれば、光導波板が得られる。   An optical waveguide plate for a backlight device comprising a cured product of the hydrosilylation-curable liquid silicone rubber composition of the present invention comprises the above-mentioned hydrosilylation-curable liquid silicone rubber composition in which each component is uniformly mixed at 80 to 350 ° C., Preferably it is obtained by heat curing at 100 to 200 ° C, more preferably 120 to 150 ° C. As the molding method, a known film molding method using a thermosetting resin can be used. For example, in the case of a press molding method, the hydrosilylation-curable liquid silicone rubber composition of the present invention is poured between two resin films (liners). The pressure vulcanization may be performed under a predetermined mold and conditions. As an example of the stretch molding method, while supplying the hydrosilylation curable liquid silicone rubber composition of the present invention between two continuous resin films, the film is stretched to a certain thickness by a roll and continuously supplied to a heating furnace. And normal pressure hot air vulcanization. If the liner is peeled off after cooling after curing, an optical waveguide plate can be obtained.

この場合、本発明のヒドロシリル化硬化型液状シリコーンゴム組成物の硬化物は、そのゴム硬度がデュロメータAで70度以上(通常70〜85度)、特に75〜85度であることが好ましい。また、厚さ2mmの硬化物シートの全光線透過率がスガ試験機(株)製直読ヘーズコンピューターHGM−2による測定値で90%以上、特に92%以上であることが好ましい。更に、厚さ0.2mmの硬化物フィルムを二つ折り(即ち180°)に折り曲げても、割れが生じないものが好ましい。   In this case, the cured product of the hydrosilylation-curable liquid silicone rubber composition of the present invention preferably has a rubber hardness of 70 degrees or more (usually 70 to 85 degrees), particularly 75 to 85 degrees in terms of durometer A. The total light transmittance of the cured sheet having a thickness of 2 mm is preferably 90% or more, particularly 92% or more as measured by a direct reading haze computer HGM-2 manufactured by Suga Test Instruments Co., Ltd. Further, it is preferable that a cured film having a thickness of 0.2 mm is not folded even when folded into two (ie, 180 °).

以下、実施例と比較例によりこの発明を具体的に説明するが、本発明は以下の実施例に限定されるものではない。なお、配合量の単位は質量部である。また、重量平均分子量、重量平均重合度は、ゲルパーミエーションクロマトグラフィ(GPC)分析におけるポリスチレン換算値である。粘度は回転粘度計による値である。   EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples and comparative examples, but the present invention is not limited to the following examples. In addition, the unit of a compounding quantity is a mass part. Moreover, a weight average molecular weight and a weight average polymerization degree are the polystyrene conversion values in a gel permeation chromatography (GPC) analysis. The viscosity is a value measured by a rotational viscometer.

[実施例1〜7、比較例1〜6]
ヒドロシリル化硬化型液状シリコーンゴム組成物の各例について、(A)シリコーン樹脂、(B)液状アルケニル基含有オルガノポリシロキサン、(C)生ゴム状アルケニル基含有オルガノポリシロキサン、(D)オルガノハイドロジェンポリシロキサン、(E)ヒドロシリル化反応触媒、(F)ヒドロシリル化反応制御剤、それぞれの配合量を表1に示した。各組成物は均一に混合撹拌、減圧脱泡した。
プレス板上に、ポリエチレンテレフタレート(PET)ライナー、厚さ2.2mmの枠を重ね、この枠内に上記のヒドロシリル化硬化型液状シリコーンゴム組成物を流し込み、この上に更にPETライナー、プレス板を積層して120℃で10分間プレス成型した。2枚のPETライナーごと取り出して冷却後、PETライナーを剥離して厚さ約2mmのシリコーンゴム製透明フィルムを得た。
同様に厚さ0.2mmのスペーサー(枠)を使用して、150℃で2分間プレス成型することにより、厚さ約0.2mmのシリコーンゴム製透明シートを得た。
[Examples 1-7, Comparative Examples 1-6]
For each example of the hydrosilylation-curable liquid silicone rubber composition, (A) silicone resin, (B) liquid alkenyl group-containing organopolysiloxane, (C) raw rubber-like alkenyl group-containing organopolysiloxane, (D) organohydrogenpoly Table 1 shows the blending amounts of siloxane, (E) hydrosilylation reaction catalyst, (F) hydrosilylation reaction control agent. Each composition was uniformly mixed and stirred and degassed under reduced pressure.
A polyethylene terephthalate (PET) liner and a 2.2 mm-thick frame are stacked on the press plate, and the hydrosilylation-curable liquid silicone rubber composition is poured into the frame, and a PET liner and a press plate are further added thereto. Laminated and press molded at 120 ° C. for 10 minutes. The two PET liners were taken out and cooled, and then the PET liner was peeled off to obtain a silicone rubber transparent film having a thickness of about 2 mm.
Similarly, a transparent sheet made of silicone rubber having a thickness of about 0.2 mm was obtained by press molding at 150 ° C. for 2 minutes using a spacer (frame) having a thickness of 0.2 mm.

これらについて下記の物性を評価した。
・ゴム硬度:JIS−K6249(2mmシート)、デュロメータA
・透明性:2mmシートの全光線透過率を測定した。
・可撓性:0.2mmシートから縦60mm×横20mmのピースを切り出し、縦方向ほぼ中央で二つ折りにし、屈曲部にクラック(割れ)が生じていなければ合格とした。
・総合評価:ゴム硬度がデュロメータAで70以上、透明性が全光線透過率90%以上、可撓性が合格の3項目全てが満足された時○、それ以外を×とした。
The following physical properties were evaluated for these.
・ Rubber hardness: JIS-K6249 (2mm sheet), durometer A
-Transparency: The total light transmittance of a 2 mm sheet was measured.
-Flexibility: A piece 60 mm long x 20 mm wide was cut out from a 0.2 mm sheet, folded in half at the center in the vertical direction, and passed if no cracks occurred at the bent part.
-Comprehensive evaluation: A rubber hardness of 70 or more with a durometer A, transparency of 90% or more of the total light transmittance, and flexibility satisfying all three items were evaluated as ◯, and the others were evaluated as x.

使用した材料
(A)シリコーン樹脂
A−1 (CH33SiO1/2単位、(CH2=CH)(CH32SiO1/2単位、SiO4/2単位の共重合体
モル比:(CH33SiO1/2/(CH2=CH)(CH32SiO1/2/SiO4/2=40/10/50
一分子当たりのアルケニル基数:4.2個(重量平均分子量=3,000)
A−2 (CH33SiO1/2単位、(CH2=CH)(CH32SiO1/2単位、SiO4/2単位の共重合体
モル比:(CH33SiO1/2/(CH2=CH)(CH32SiO1/2/SiO4/2=40/5/55
一分子当たりのアルケニル基数:3.5個(重量平均分子量=5,000)
A−3 (CH33SiO1/2単位、(CH2=CH)(CH3)SiO2/2単位、SiO4/2単位の共重合体
モル比:(CH33SiO1/2/(CH2=CH)(CH3)SiO2/2/SiO4/2=45/10/45
一分子当たりのアルケニル基数:4.2個(重量平均分子量=3,000)
A−4 (CH33SiO1/2単位、SiO4/2単位の共重合体
モル比:(CH33SiO1/2/SiO4/2=50/50
一分子当たりのアルケニル基数:0個(重量平均分子量=3,000)
Materials Used (A) Silicone Resin A-1 Copolymer of (CH 3 ) 3 SiO 1/2 Unit, (CH 2 ═CH) (CH 3 ) 2 SiO 1/2 Unit, SiO 4/2 Unit Molar ratio : (CH 3) 3 SiO 1/2 / (CH 2 = CH) (CH 3) 2 SiO 1/2 / SiO 4/2 = 40/10/50
Number of alkenyl groups per molecule: 4.2 (weight average molecular weight = 3,000)
Copolymer of A-2 (CH 3 ) 3 SiO 1/2 unit, (CH 2 ═CH) (CH 3 ) 2 SiO 1/2 unit, SiO 4/2 unit Molar ratio: (CH 3 ) 3 SiO 1 / 2 / (CH 2 ═CH) (CH 3 ) 2 SiO 1/2 / SiO 4/2 = 40/5/55
Number of alkenyl groups per molecule: 3.5 (weight average molecular weight = 5,000)
A-3 Copolymer of (CH 3 ) 3 SiO 1/2 unit, (CH 2 ═CH) (CH 3 ) SiO 2/2 unit, SiO 4/2 unit Molar ratio: (CH 3 ) 3 SiO 1 / 2 / (CH 2 ═CH) (CH 3 ) SiO 2/2 / SiO 4/2 = 45/10/45
Number of alkenyl groups per molecule: 4.2 (weight average molecular weight = 3,000)
A-4 (CH 3 ) 3 SiO 1/2 unit, SiO 4/2 unit copolymer Molar ratio: (CH 3 ) 3 SiO 1/2 / SiO 4/2 = 50/50
Number of alkenyl groups per molecule: 0 (weight average molecular weight = 3,000)

(B)液状アルケニル基含有オルガノポリシロキサン
B−1 両末端ジメチルビニルシロキシ基封鎖ジメチルポリシロキサン
重量平均重合度:約1,100(重量平均分子量=約80,000)
粘度:約100Pa・s
B−2 両末端ジメチルビニルシロキシ基封鎖ジメチルポリシロキサン
重量平均重合度:約450(重量平均分子量=約33,000)
粘度:約5Pa・s
B−3 両末端トリメチルシロキシ基封鎖ジメチルポリシロキサン・ジメチルポリシロキサン共重合体
重量平均重合度:約750(重量平均分子量=約56,000)
粘度:約30Pa・s
一分子当たりのアルケニル基数:3.8個
(B) Liquid alkenyl group-containing organopolysiloxane B-1 Both end dimethylvinylsiloxy group-capped dimethylpolysiloxane Weight average degree of polymerization: about 1,100 (weight average molecular weight = about 80,000)
Viscosity: about 100 Pa · s
B-2 Both end dimethylvinylsiloxy group-capped dimethylpolysiloxane Weight average degree of polymerization: about 450 (weight average molecular weight = about 33,000)
Viscosity: about 5 Pa · s
B-3 Trimethylsiloxy group-blocked dimethylpolysiloxane / dimethylpolysiloxane copolymer at both terminals Weight average degree of polymerization: about 750 (weight average molecular weight = about 56,000)
Viscosity: about 30 Pa · s
Number of alkenyl groups per molecule: 3.8

(C)生ゴム状アルケニル基含有オルガノポリシロキサン
C−1 両末端ジメチルビニルシロキシ基封鎖ジメチルポリシロキサン
重量平均重合度:約8,000(重量平均分子量=約600,000)
C−2 両末端トリメチルシロキシ基封鎖ビニルメチルシロキサン・ジメチルポリシロキサン共重合体
重量平均重合度:約8,000(重量平均分子量=約600,000)
一分子当たりのアルケニル基数:10個
C−3 両末端トリメチルシロキシ基封鎖ジメチルポリシロキサン
重量平均重合度:約8,000(重量平均分子量=約600,000)
一分子当たりのアルケニル基数:0個
(C) Raw rubber-like alkenyl group-containing organopolysiloxane C-1 Both end dimethylvinylsiloxy group-capped dimethylpolysiloxane Weight average degree of polymerization: about 8,000 (weight average molecular weight = about 600,000)
C-2 Trimethylsiloxy group-blocked vinylmethylsiloxane / dimethylpolysiloxane copolymer at both terminals Weight average degree of polymerization: about 8,000 (weight average molecular weight = about 600,000)
Number of alkenyl groups per molecule: 10 C-3 Trimethylsiloxy group-blocked dimethylpolysiloxanes at both ends Weight average degree of polymerization: about 8,000 (weight average molecular weight = about 600,000)
Number of alkenyl groups per molecule: 0

(D)オルガノハイドロジェンポリシロキサン
D−1 両末端トリメチルシロキシ基封鎖メチルハイドロジェンポリシロキサン
粘度:20mPa・s
一分子当たりのSiH基数:40個(SiH基含有量0.016mol/g)
D−2 両末端ジメチルハイドロジェンシロキシ基封鎖ジメチルポリシロキサン・メチルハイドロジェンポリシロキサン共重合体
粘度:40mPa・s
一分子当たりのSiH基数:45個(SiH基含有量0.011mol/g)
(E)ヒドロシリル化反応触媒
E−1 1−エチニルシクロヘキサノール
(F)ヒドロシリル化反応触媒
F−1 白金触媒
Pt濃度:1重量%
(D) Organohydrogenpolysiloxane D-1 Both end trimethylsiloxy group-capped methylhydrogenpolysiloxane Viscosity: 20 mPa · s
Number of SiH groups per molecule: 40 (SiH group content 0.016 mol / g)
D-2 Both-end dimethylhydrogensiloxy group-blocked dimethylpolysiloxane / methylhydrogenpolysiloxane copolymer Viscosity: 40 mPa · s
Number of SiH groups per molecule: 45 (SiH group content 0.011 mol / g)
(E) Hydrosilylation reaction catalyst E-1 1-ethynylcyclohexanol (F) hydrosilylation reaction catalyst F-1 Platinum catalyst Pt concentration: 1% by weight

Figure 0004605402
Figure 0004605402

Claims (6)

(A)R3SiO1/2単位(M単位)、SiO4/2単位(Q単位)、R2SiO2/2単位(D単位)、及びRSiO3/2単位(T単位)から選択される単位からなり、これらの全構成単位のうちM単位及びQ単位の合計量が80mol%以上であり、かつQ単位に対するM単位のモル比が0.5〜1.5の範囲であるシリコーン樹脂
100質量部
(ここで、Rは炭素数1〜6の一価炭化水素基であり、かつ一分子中の少なくとも2個はアルケニル基である。)
(B)平均重合度が2,000以下で、かつ分子中のケイ素原子数が4個以上であり、一分子中に少なくとも2個のケイ素原子と結合したアルケニル基を含有する、主鎖がジオルガノシロキサン単位(D単位)の繰り返しからなり分子鎖両末端がトリオルガノシロキシ基(M単位)で封鎖された直鎖状オルガノポリシロキサン
50〜200質量部
(C)平均重合度が2,000を超えかつ100,000以下である、一分子中に少なくとも2個のケイ素原子と結合したアルケニル基を含有する室温で生ゴム状のオルガノポリシロキサン
1〜50質量部
(D)一分子中に少なくとも2個のケイ素原子と結合した水素原子を含有するオルガノハイドロジェンポリシロキサン
(A),(B)成分及び(C)成分中のケイ素原子と
結合したアルケニル基1個当たり、ケイ素原子に
結合した水素原子の数が1.0〜10.0個となる量
(E)ヒドロシリル化反応触媒 触媒量
を必須成分とすることを特徴とする光導波板用ヒドロシリル化硬化型液状シリコーンゴム組成物。
(A) selected from R 3 SiO 1/2 unit (M unit), SiO 4/2 unit (Q unit), R 2 SiO 2/2 unit (D unit), and RSiO 3/2 unit (T unit) A silicone resin in which the total amount of M units and Q units is 80 mol% or more, and the molar ratio of M units to Q units is in the range of 0.5 to 1.5.
100 parts by mass (wherein R is a monovalent hydrocarbon group having 1 to 6 carbon atoms, and at least two in one molecule are alkenyl groups)
(B) The average degree of polymerization is 2,000 or less, the number of silicon atoms in the molecule is 4 or more, and the main chain contains an alkenyl group bonded to at least two silicon atoms in one molecule. Linear organopolysiloxane consisting of repeating organosiloxane units (D units), with both ends of the molecular chain blocked with triorganosiloxy groups (M units)
50 to 200 parts by weight (C) an average polymerization degree of Ru der and 100,000 than 2,000, at least two room temperature gum of containing bonded alkenyl groups and silicon atoms organo per molecule Polysiloxane
1 to 50 parts by mass (D) Organohydrogenpolysiloxane containing hydrogen atoms bonded to at least two silicon atoms in one molecule
(A), (B) component and (C) silicon atom in component and
Per bonded alkenyl group to a silicon atom
Amount (E) hydrosilylation reaction catalyst in which the number of bonded hydrogen atoms is 1.0-10.0. A hydrosilylation-curable liquid silicone rubber composition for optical waveguide plates, characterized in that the catalyst amount is an essential component. .
(A)成分のシリコーン樹脂が、ビニルジメチルシロキシ基とQ単位の共重合体、ビニルジメチルシロキシ基・トリメチルシロキシ基とQ単位の共重合体、ビニルジメチルシロキシ基・ジメチルシロキサン単位とQ単位の共重合体、ビニルジメチルシロキシ基・フェニルシルセスキオキサン単位とQ単位の共重合体、ビニルジメチルシロキシ基・ジメチルシロキサン単位・フェニルシルセスキオキサン単位とQ単位の共重合体、及びトリメチルシロキシ基・ビニルメチルシロキサン単位とQ単位の共重合体から選ばれる請求項1記載の光導波板用ヒドロシリル化硬化型液状シリコーンゴム組成物。The component (A) silicone resin is a copolymer of vinyldimethylsiloxy group and Q unit, a copolymer of vinyldimethylsiloxy group / trimethylsiloxy group and Q unit, a copolymer of vinyldimethylsiloxy group / dimethylsiloxane unit and Q unit. Polymer, copolymer of vinyldimethylsiloxy group / phenylsilsesquioxane unit and Q unit, copolymer of vinyldimethylsiloxy group / dimethylsiloxane unit / phenylsilsesquioxane unit and Q unit, and trimethylsiloxy group / The hydrosilylation-curable liquid silicone rubber composition for an optical waveguide plate according to claim 1, which is selected from a copolymer of vinylmethylsiloxane units and Q units. (B)成分の25℃での粘度が1〜100Pa・sである請求項1又は2記載の光導波板用ヒドロシリル化硬化型液状シリコーンゴム組成物。The hydrosilylation-curable liquid silicone rubber composition for an optical waveguide plate according to claim 1 or 2, wherein the component (B) has a viscosity at 25 ° C of 1 to 100 Pa · s. C)成分が、直鎖状のジオルガノポリシロキサンである請求項1、2又は3記載の光導波板用ヒドロシリル化硬化型液状シリコーンゴム組成物。 The hydrosilylation-curable liquid silicone rubber composition for an optical waveguide plate according to claim 1 , wherein the component ( C) is a linear diorganopolysiloxane. 請求項1乃至4のいずれか1項記載のヒドロシリル化硬化型液状シリコーンゴム組成物を硬化させてなり、ゴム硬度がデュロメータAで70度以上であることを特徴とする硬化物 Curing the claims 1 to hydrosilylation-curable liquid silicone rubber composition according to any one of the 4 becomes, the cured product, wherein the rubber hardness of 70 degrees or more in durometer A. さ2mmの硬化物シートの全光線透過率が90%以上であることを特徴とする請求項記載の硬化物からなる光導波板6. The optical waveguide plate comprising a cured product according to claim 5 , wherein the cured product sheet having a thickness of 2 mm has a total light transmittance of 90% or more.
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