JPH059039B2 - - Google Patents
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- Publication number
- JPH059039B2 JPH059039B2 JP60151881A JP15188185A JPH059039B2 JP H059039 B2 JPH059039 B2 JP H059039B2 JP 60151881 A JP60151881 A JP 60151881A JP 15188185 A JP15188185 A JP 15188185A JP H059039 B2 JPH059039 B2 JP H059039B2
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- JP
- Japan
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- Prior art date
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- 239000000203 mixture Substances 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 17
- 239000000843 powder Substances 0.000 claims description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
- 229920002379 silicone rubber Polymers 0.000 claims description 8
- 239000004945 silicone rubber Substances 0.000 claims description 8
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 5
- 229920005645 diorganopolysiloxane polymer Polymers 0.000 claims description 5
- 229920005992 thermoplastic resin Polymers 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- -1 polysiloxane Polymers 0.000 description 7
- 239000000945 filler Substances 0.000 description 6
- 239000004677 Nylon Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229920001778 nylon Polymers 0.000 description 5
- 239000000523 sample Substances 0.000 description 5
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 5
- 229920001971 elastomer Polymers 0.000 description 4
- 229920001296 polysiloxane Polymers 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000002604 ultrasonography Methods 0.000 description 3
- 238000004073 vulcanization Methods 0.000 description 3
- 239000002033 PVDF binder Substances 0.000 description 2
- 238000007259 addition reaction Methods 0.000 description 2
- 229920005601 base polymer Polymers 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000004205 dimethyl polysiloxane Substances 0.000 description 2
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 239000011256 inorganic filler Substances 0.000 description 2
- 229910003475 inorganic filler Inorganic materials 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- WRXCBRHBHGNNQA-UHFFFAOYSA-N (2,4-dichlorobenzoyl) 2,4-dichlorobenzenecarboperoxoate Chemical compound ClC1=CC(Cl)=CC=C1C(=O)OOC(=O)C1=CC=C(Cl)C=C1Cl WRXCBRHBHGNNQA-UHFFFAOYSA-N 0.000 description 1
- NOSXUFXBUISMPR-UHFFFAOYSA-N 1-tert-butylperoxyhexane Chemical compound CCCCCCOOC(C)(C)C NOSXUFXBUISMPR-UHFFFAOYSA-N 0.000 description 1
- DMWVYCCGCQPJEA-UHFFFAOYSA-N 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane Chemical compound CC(C)(C)OOC(C)(C)CCC(C)(C)OOC(C)(C)C DMWVYCCGCQPJEA-UHFFFAOYSA-N 0.000 description 1
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 1
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 125000003342 alkenyl group Chemical group 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 125000004218 chloromethyl group Chemical group [H]C([H])(Cl)* 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 125000004093 cyano group Chemical group *C#N 0.000 description 1
- 125000000753 cycloalkyl group Chemical group 0.000 description 1
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 229910021485 fumed silica Inorganic materials 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 125000001183 hydrocarbyl group Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000012763 reinforcing filler Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
- 125000000725 trifluoropropyl group Chemical group [H]C([H])(*)C([H])([H])C(F)(F)F 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
Landscapes
- Ultra Sonic Daignosis Equipment (AREA)
Description
（産業上の利用分野）
本発明は音響レンズ組成物、特には音速を900
〜1100ｍ／秒に維持して音響インピーダンスを生
体に近づけることができると共に、高周波領域に
おける超音波減衰量が少なく解像度の高い音響レ
ンズを形成し得る、超音波診断装置用探触子の音
響レンズ剤として有用とされる音響レンズ組成物
に関するものである。
（従来の技術）
超音波診断装置用探触子の音響レンズについて
は超音波を集束すると共に生体とよく密着して生
体との界面での超音波の反射を少なくし得るこ
と、レンズ自体の超音波減衰が小さいこと、また
機械的強度が強く、化学的にも安定していること
が必要条件とされることから、オルガノポリシロ
キサンにシリカ、アルミナ、酸化チタンなどの無
機充填剤を加えたシリコーンゴムが使用されてい
る。
しかして、従来この種の用途に使用されるシリ
コーンゴムは充填剤を多量に添加し、密度を上げ
てその音響インピーダンスを生体のそれに一致さ
せるようにしたものとされているが、この密度増
加のために密度の高い充填剤を使用すると音速の
低下によるマイナス効果が発生し、この場合には
例えばその音響インピーダンスを生体のそれに近
づけると充填剤の多量添加のために音響レンズの
超音波減衰が大きくなり、5MHz以上の高周波領
域での感度が低下するという不利が生じ、この減
衰量については充填剤の種類よりもその粒径、混
合率、密度に比例して大きくなるということも知
られている。
（発明の構成）
本発明はこのような不利を解決した音響レンズ
組成物に関するものであり、これは(1)ジオルガポ
リシロキサンまたはこれを主材とするシリコーン
ゴムコンパウンド100重量部、(2)平均粒子径が0.1
〜1.0μｍであるアルミナまたは酸化チタン粉末50
〜150重量部、(3)平均粒子径が0.1〜50μｍで、か
つ融点が80℃以上である熱可塑性樹脂粉末10〜
100重量部とからなることを特徴とするものであ
る。
すなわち、本発明者らは超音波診断装置用探触
子の音響レンズに関し、その音響インピーダンス
（音速×密度）を生体の音響インピーダンスであ
る1.4〜1.6×106Kg／m2・秒に近い値に保つと共に
音速を900〜1100ｍ／秒に維持しても超音波減衰
量の少ないものを得べく、種々検討した結果、シ
リコーンゴムの音響インピーダンスを目標に近づ
ける手段としてはアルミナ、酸化チタンなどのよ
うに密度の高い充填剤を添加して全体の高密度化
をはかることが有効であるが、これだけでは音速
が低下するし目標とする音響インピーダンスに近
づけるには多量の添加が必要とされ、このために
減衰量が増大し、特に5MHz以上の高周波領域で
の実用性が失なわれるが、これに例えばナイロン
パウダーのような熱可塑性樹脂粉末を添加すると
音速を上げることができるし、組成物の超音波減
衰量を小さくすることができるということを見出
し、こゝに使用するシリコーンゴム、熱可塑性樹
脂粉末の種類、粒子径、充填量などについての研
究を進めて本発明を完成させた。
本発明の組成物を構成する第１成分としてのジ
オルガノボリシロキサンは式R2SiO4-o/2で示さ
れ、Ｒはメチル基、エチル基、プロピル基、ブチ
ル基などのアルキル基、ビニル基、アリル基など
のアルケニル基、フエニル基、トリル基などのア
リール基、シクロヘキシル基などのシクロアルキ
ル基またはこれらの基の炭素原子に結合した水素
原子の一部または全部をハロゲン原子、シアノ基
などで置換したクロロメチル基、トリフルオロプ
ロピル基、シアノメチル基などがら選択される。
好ましくはその少なくとも50％がメチル基とされ
る同種または異種の非置換または置換１価炭化水
素基、ｎは1.98〜2.02とされるものであり、この
ものの分子鎖末端はトリメチルシリル基、ジメチ
ルビニルシリル基、水酸基などで封鎖されたもの
とされ、通常は粘度が数百万センチストークスで
ある生ゴム状のものとすることがよいが、これは
約500から100000cSの液状物であつてもよい。
しかし、このジオルガノポリシロキサンはこれ
をベースポリマーとしてこれに補強性充填剤とし
てのヒユームドシリカを所定量、例えばベースポ
リマー100重量部に対して５〜40重量部添加して
シリコーンゴムコンパウンドとしたものであつて
もよい。
つぎにこの組成物における第２成分としての無
機質充填剤はこの組成物を高密度のものとするこ
とが必要とされることから、密度(d)が3.9である
アルミナ、4.2の酸化チタンとされ、その平均粒
子径が0.1μｍ以下では高純填がむづかしいし、超
音波減衰量も低下せず、1.0μｍ以上とすると減衰
量が増大して実用性がなくなるので平均粒子径が
0.1〜1.0μｍの範囲のものとする必要がある。ま
た、この添加量は上記した第１成分100重量部に
対し50重量部以下では少なすぎてこの組成物の密
度増大が期待できず、150重量部以上とすると減
衰量が大きくなるし音速も低下するので50〜150
重量部の範囲とする必要があるが、好ましい範囲
は60〜120重量部とされる。
また、この組成物を構成する第３成分としての
熱可塑性樹脂粉末については市販のものを使用す
ればよく、これはその平均粒子径が0.1μｍ以下で
は高充填がむづかしい入手も困難であり、50μｍ
以上では減衰量が増大し、加硫後の機械的ゴム物
性も損なわれるので平均粒子径が0.1〜50μｍの範
囲のものとすることが必要とされるが、音速で
2000ｍ／秒前後のものが音速向上に適することを
加味すればナイロン、ポリフツ化ビニリデン、ポ
リエチレン、ポリメチルメタクリレート、ポリス
チレンなどが好ましいものとして例示される。ま
た、この添加量は上記した第１成分100重量部に
対し10重量部以下では音速向上が期待できず、
100重量部以上とすると第２成分の添加量とバラ
ンスをとつても音速が上がりすぎるし、この高充
填に伴なつて減衰量も増大するので10〜100重量
部の範囲とすることが必要とされる。なお、この
ものはその融点が低すぎると上記した第１、第２
成分との混練時に粉体の形状がすぐれて凝集し、
粒子の増大を招くので、融点が80℃以上のものと
することが必要とされる。
本発明の組成物は上記した第１〜第３成分の所
定量を均一に混練することによつて得ることがで
きるが、このものは必要に応じ第１成分としての
ジオルガノポリシロキサンまたはシリコーンゴム
コンパウンドを加硫して弾性体として使用するこ
とがよく、この加硫はこれにペンゾイルパーオキ
サイド、２，４−ジクロロベンゾイルパーオキサ
イド、ジクミルパーオキサイド、２，５−ジメチ
ル−２，５−ジ（ｔ−ブチルパーオキシ）ヘキサ
ンなどのような公知の有機過酸化物を添加して所
定温度に加熱すればよく、この第１成分としての
ジオルガノポリシロキサンがビニル基などの不飽
和基を含有するものである場合にはこのビニル基
と付加反応をするけい素原子に結合した水素原子
を含有するオルガノハイドロジエンポリシロキサ
ンと白金系触媒とを添加してその付加反応によつ
て硬化させるようにしてもよい。
本発明の組成物から超音波診断装置用探触子と
しての音響レンズを形成するにはこの組成物をプ
レス成形など適宜な手段で成形、加硫すればよ
く、このようにして得られた音響レンズはこの第
２成分、第３成分の添加によつて音速が900〜
1100m2／秒でその音響インピーダンスも全体のそ
れに近いものとなり、5MHz以上の高周波領域に
おける超音波減衰量も少なくなるので解像度の高
いものになるという有利性が与えられる。
つぎに本発明の実施例をあげるが、例中の部は
重量部を、また粘度は25℃での測定値を示したも
のである。
実施例１、比較例１〜２
分子鎖両末端がジメチルビニル基で封鎖され
た、粘度が５×106cSであり、ビニル基含有量が
0.02モル％であるジメチルポリシロキサン100部
に、平均粒子径が0.4μｍであるアルミナ・AES−
12（住友アルミニウム製錬社製商品名）80部、平
均粒子径が4μｍであるナイロンパウダー・SP−
500（東レ社製商品名）35部を添加して二本ロール
で混練し、ついで高速三本ロールを用いて均一に
分散させた。
つぎにこの組成物100部に対して加硫剤として
の２，５−ジメチル−２，５−ジ（ｔ−ブチルパ
ーオキシ）ヘキサン0.5部を混合し、165℃で10分
間プレス成形して厚さ２mmのシート（以下シート
１と略記する）を作ると共に、比較のために上記
におけるアルミナを平均粒子径が5μｍであるア
ルミナ・AL−24（昭和軽金属社製商品名）80部と
したものについて同様に処理して厚さ２mmのシー
ト（以下シート２と略記する）を、また上記にお
けるナイロンパウダーを平均粒子径が100μｍの
ポリフツ化ビニリデン・KF＃1000（呉羽化学社製
商品名）35部としたものについて同様に処理して
厚さ２mmのシート（以下シート３と略記する）を
作り、これらについての音響特性をしらべたとこ
ろ、第１表に示したとおりの結果が得られた。
(Industrial Application Field) The present invention relates to an acoustic lens composition, particularly an acoustic lens composition that
Acoustic lens agent for probes for ultrasound diagnostic equipment that can maintain acoustic impedance at ~1100 m/sec to bring it closer to living bodies, and form an acoustic lens with low ultrasound attenuation in the high frequency range and high resolution. The present invention relates to an acoustic lens composition that is useful as an acoustic lens composition. (Prior art) Acoustic lenses for probes for ultrasonic diagnostic equipment focus ultrasonic waves, come in close contact with the living body, and reduce the reflection of ultrasonic waves at the interface with the living body; Silicone, which is made by adding inorganic fillers such as silica, alumina, and titanium oxide to organopolysiloxane, is required because it has low acoustic attenuation, strong mechanical strength, and chemical stability. rubber is used. Conventionally, silicone rubber used for this type of application has been made by adding a large amount of filler to increase its density and make its acoustic impedance match that of a living body. Therefore, if a dense filler is used, a negative effect will occur due to a decrease in the speed of sound, and in this case, for example, if the acoustic impedance approaches that of a living body, the ultrasonic attenuation of the acoustic lens will increase due to the addition of a large amount of filler. This has the disadvantage of decreasing sensitivity in the high frequency range of 5MHz or higher, and it is also known that the amount of attenuation increases in proportion to the particle size, mixing ratio, and density of the filler rather than the type of filler. . (Structure of the Invention) The present invention relates to an acoustic lens composition that solves these disadvantages, and includes (1) 100 parts by weight of diorga polysiloxane or a silicone rubber compound based on this, (2) Average particle size is 0.1
~1.0μm alumina or titanium oxide powder 50
~150 parts by weight, (3) 10~ thermoplastic resin powder with an average particle diameter of 0.1 to 50 μm and a melting point of 80°C or higher
100 parts by weight. In other words, the present inventors have determined that the acoustic impedance (sound velocity x density) of the acoustic lens of a probe for an ultrasound diagnostic device is close to the acoustic impedance of a living body, which is 1.4 to 1.6 x 10 6 Kg/m 2 sec. As a result of various studies, we have found that materials such as alumina, titanium oxide, etc. can be used to bring the acoustic impedance of silicone rubber closer to the target. It is effective to increase the overall density by adding a high-density filler to the material, but this alone reduces the sound velocity and requires a large amount of addition to get close to the target acoustic impedance. However, if thermoplastic resin powder such as nylon powder is added to this, the sound velocity can be increased, and the super They found that it is possible to reduce the amount of sound attenuation, and completed the present invention by conducting research on the type, particle size, filling amount, etc. of silicone rubber and thermoplastic resin powder to be used. The diorganoborisiloxane as the first component constituting the composition of the present invention is represented by the formula R 2 SiO 4-o/2 , where R is an alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, or a vinyl group. Alkenyl groups such as allyl groups, aryl groups such as phenyl groups and tolyl groups, cycloalkyl groups such as cyclohexyl groups, or some or all of the hydrogen atoms bonded to the carbon atoms of these groups are replaced with halogen atoms, cyano groups, etc. chloromethyl group, trifluoropropyl group, cyanomethyl group, etc. substituted with .
Preferably, at least 50% of the same or different unsubstituted or substituted monovalent hydrocarbon groups are methyl groups, n is 1.98 to 2.02, and the molecular chain terminal of this group is trimethylsilyl group, dimethylvinylsilyl group. It is said to be capped with groups, hydroxyl groups, etc., and is usually a raw rubber-like material with a viscosity of several million centistokes, but it may also be a liquid material with a viscosity of about 500 to 100,000 cS. However, this diorganopolysiloxane is made into a silicone rubber compound by using this as a base polymer and adding a predetermined amount of fumed silica as a reinforcing filler, for example, 5 to 40 parts by weight per 100 parts by weight of the base polymer. It may be hot. Next, since the inorganic filler as the second component in this composition is required to have a high density, alumina with a density (d) of 3.9 and titanium oxide with a density (d) of 4.2 are selected. If the average particle size is less than 0.1 μm, it is difficult to fill with high purity and the amount of ultrasonic attenuation will not decrease, and if the average particle size is more than 1.0 μm, the amount of attenuation increases and becomes impractical.
It needs to be in the range of 0.1 to 1.0 μm. Furthermore, if the amount added is less than 50 parts by weight relative to 100 parts by weight of the first component, it is too small and no increase in the density of this composition can be expected, whereas if it is more than 150 parts by weight, the amount of attenuation increases and the speed of sound decreases. so 50~150
It is necessary to set the amount in a range of parts by weight, and a preferable range is 60 to 120 parts by weight. Furthermore, as for the thermoplastic resin powder as the third component constituting this composition, a commercially available one may be used, but if the average particle size is 0.1 μm or less, it is difficult to fill it with high density and it is difficult to obtain it.
Above this, the attenuation will increase and the mechanical properties of the rubber after vulcanization will be impaired, so it is necessary to have an average particle size in the range of 0.1 to 50 μm.
Considering that a speed of around 2000 m/sec is suitable for increasing the sound speed, nylon, polyvinylidene fluoride, polyethylene, polymethyl methacrylate, polystyrene, etc. are preferred examples. In addition, if the amount added is less than 10 parts by weight per 100 parts by weight of the first component, no improvement in the speed of sound can be expected.
If it is more than 100 parts by weight, the sound velocity will increase too much even when balanced with the amount of the second component added, and the amount of attenuation will also increase with this high filling, so it is necessary to keep it in the range of 10 to 100 parts by weight. be done. In addition, the melting point of this material is too low, and the above-mentioned points 1 and 2
When kneaded with the ingredients, the shape of the powder is excellent and it coagulates.
Since this leads to an increase in particles, it is necessary to have a melting point of 80°C or higher. The composition of the present invention can be obtained by uniformly kneading predetermined amounts of the first to third components described above, but this composition can be obtained by adding diorganopolysiloxane or silicone rubber as the first component, if necessary. The compound is often used as an elastomer by vulcanization, and this vulcanization is applied to penzoyl peroxide, 2,4-dichlorobenzoyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-dimethyl It is sufficient to add a known organic peroxide such as (t-butylperoxy)hexane and heat it to a predetermined temperature, and this diorganopolysiloxane as the first component contains unsaturated groups such as vinyl groups. In this case, an organohydrodiene polysiloxane containing a hydrogen atom bonded to a silicon atom that undergoes an addition reaction with the vinyl group and a platinum-based catalyst are added, and curing is caused by the addition reaction. It's okay. In order to form an acoustic lens as a probe for an ultrasonic diagnostic device from the composition of the present invention, this composition may be molded and vulcanized by an appropriate means such as press molding, and the acoustic Due to the addition of the second and third components, the lens has a sound speed of 900~
At 1100 m 2 /sec, its acoustic impedance is close to that of the whole, and the amount of ultrasonic attenuation in the high frequency region of 5 MHz or higher is also reduced, giving the advantage of high resolution. Next, examples of the present invention will be given, in which parts are parts by weight, and viscosity is a value measured at 25°C. Example 1, Comparative Examples 1 and 2 Both ends of the molecular chain are blocked with dimethyl vinyl groups, the viscosity is 5 × 10 6 cS, and the vinyl group content is
Alumina AES- with an average particle size of 0.4 μm is added to 100 parts of dimethylpolysiloxane with a concentration of 0.02 mol%.
12 (trade name manufactured by Sumitomo Aluminum Smelting Co., Ltd.) 80 parts, nylon powder with an average particle size of 4 μm SP-
500 (trade name, manufactured by Toray Industries, Inc.) was added and kneaded using two rolls, and then uniformly dispersed using three high-speed rolls. Next, 0.5 parts of 2,5-dimethyl-2,5-di(t-butylperoxy)hexane as a vulcanizing agent was mixed with 100 parts of this composition, and the mixture was press-molded at 165°C for 10 minutes to give a thick A sheet with a diameter of 2 mm (hereinafter abbreviated as sheet 1) was made, and for comparison, 80 parts of alumina AL-24 (trade name manufactured by Showa Light Metal Co., Ltd.) with an average particle size of 5 μm was used as the alumina above. A sheet with a thickness of 2 mm (hereinafter abbreviated as sheet 2) was processed in the same manner, and the nylon powder obtained above was treated with 35 parts of polyvinylidene fluoride KF#1000 (trade name manufactured by Kureha Chemical Co., Ltd.) with an average particle size of 100 μm. A sheet with a thickness of 2 mm (hereinafter abbreviated as sheet 3) was prepared by processing the sample in the same manner, and the acoustic characteristics of these sheets were examined, and the results shown in Table 1 were obtained.
【表】
実施例 ２
分子鎖両末端がジメチルビニル基で封鎖され
た、フエニル基を10モル％、ビニル基を0.15モル
％含有する、粘度が３×106cSのジメチルポリシ
ロキサン生ゴム100部に比表面積が200m2／ｇであ
るヒユームドシリカ・エロジル200（日本エロジル
社製商品名）20部を添加したシリコーンゴムコン
パウンド100部に、平均粒子径が0.3μｍである酸
化チタン・CR−93（石原産業社製商品名）70部と
平均粒子径が7.5μｍであるナイロンパウダー・ダ
イアミドWS（不二化成社製商品名）30部を添加
してロール混練した組成物を実施例１と同様に処
理して加硫シートを作り、このものの音響特性を
しらべたところ、密度1.37、音速1038ｍ／秒、音
響インピーダンス1.42×106Kg／m2・秒の値が得
られ、これは音響レンズとしての特性を充分有す
るものであつた。[Table] Example 2 100 parts of dimethylpolysiloxane raw rubber with a viscosity of 3 x 10 6 cS containing 10 mol% of phenyl groups and 0.15 mol% of vinyl groups, with both ends of the molecular chain capped with dimethylvinyl groups. Titanium oxide CR- 93 (Ishihara Sangyo Co., Ltd.) with an average particle size of 0.3 μm was added to 100 parts of a silicone rubber compound to which 20 parts of humid silica Erosil 200 (trade name, manufactured by Nippon Erosil Co., Ltd.) with a specific surface area of 200 m 2 /g was added. A composition obtained by adding 70 parts of Nylon Powder Diamide WS (trade name, manufactured by Fuji Kasei Co., Ltd.) with an average particle size of 7.5 μm and roll-kneading was treated in the same manner as in Example 1. When we investigated the acoustic properties of this material, we found that the density was 1.37, the speed of sound was 1038 m/sec, and the acoustic impedance was 1.42 x 10 6 Kg/m 2 sec, which indicates its properties as an acoustic lens. I had enough.
Claims (1)
主材とするシリコーンゴムコンパウンド
100重量部、 (2) 平均粒子径が0.1〜1.0μｍであるアルミナま
たは酸化チタン粉末 50〜150重量部、 (3) 平均粒子径が0.1〜50μｍで、かつ融点が80℃
以上である熱可塑性樹脂粉末 10〜100重量部 とからなることを特徴とする音響レンズ用組成
物。[Scope of Claims] 1 (1) Diorganopolysiloxane or a silicone rubber compound based on this diorganopolysiloxane
100 parts by weight, (2) 50 to 150 parts by weight of alumina or titanium oxide powder with an average particle size of 0.1 to 1.0 μm, (3) an average particle size of 0.1 to 50 μm, and a melting point of 80°C
An acoustic lens composition comprising 10 to 100 parts by weight of the above thermoplastic resin powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60151881A JPS6211897A (en) | 1985-07-10 | 1985-07-10 | Composition for acoustic lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60151881A JPS6211897A (en) | 1985-07-10 | 1985-07-10 | Composition for acoustic lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6211897A JPS6211897A (en) | 1987-01-20 |
| JPH059039B2 true JPH059039B2 (en) | 1993-02-03 |
Family
ID=15528241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60151881A Granted JPS6211897A (en) | 1985-07-10 | 1985-07-10 | Composition for acoustic lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6211897A (en) |
Families Citing this family (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6013715A (en) * | 1997-04-22 | 2000-01-11 | Dow Corning Corporation | Thermoplastic silicone elastomers |
| US6015858A (en) * | 1998-09-08 | 2000-01-18 | Dow Corning Corporation | Thermoplastic silicone elastomers based on fluorocarbon resin |
| US6153691A (en) * | 1998-10-07 | 2000-11-28 | Dow Corning Corporation | Thermoplastic silicone vulcanizates prepared by condensation cure |
| US6281286B1 (en) | 1999-09-09 | 2001-08-28 | Dow Corning Corporation | Toughened thermoplastic resins |
| US6362287B1 (en) | 2000-03-27 | 2002-03-26 | Dow Corning Corportion | Thermoplastic silicone elastomers formed from nylon resins |
| DE60138247D1 (en) * | 2000-07-13 | 2009-05-20 | Panasonic Corp | Acoustic lens and related manufacturing process |
| US6362288B1 (en) | 2000-07-26 | 2002-03-26 | Dow Corning Corporation | Thermoplastic silicone elastomers from compatibilized polyamide resins |
| US6465552B1 (en) | 2001-05-01 | 2002-10-15 | Dow Corning Corporation | Thermoplastic silicone elastomers employing radical cure |
| CN1982374A (en) * | 2003-09-29 | 2007-06-20 | 株式会社东芝 | Acoustic lens composition, and ultrasonic probe and ultrasonic diagnostic apparatus |
| JP4256309B2 (en) * | 2003-09-29 | 2009-04-22 | 株式会社東芝 | Ultrasonic probe and ultrasonic diagnostic apparatus |
| US7902294B2 (en) | 2008-03-28 | 2011-03-08 | General Electric Company | Silicone rubber compositions comprising bismuth oxide and articles made therefrom |
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| JP6672134B2 (en) * | 2016-12-22 | 2020-03-25 | オリンパス株式会社 | Acoustic lens for ultrasonic endoscope and ultrasonic endoscope device |
| JP6817140B2 (en) * | 2017-05-17 | 2021-01-20 | 富士フイルム株式会社 | Resin for acoustic wave probe, resin material for acoustic wave probe, manufacturing method of resin material for acoustic wave probe, acoustic lens, acoustic wave probe, ultrasonic probe, acoustic wave measuring device, ultrasonic diagnostic device, photoacoustic wave measuring device and Endoscopic ultrasound |
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| JP2022187242A (en) * | 2021-06-07 | 2022-12-19 | コニカミノルタ株式会社 | Resin composition, acoustic member, ultrasonic transducer, ultrasonic probe and ultrasonic diagnostic apparatus |
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-
1985
- 1985-07-10 JP JP60151881A patent/JPS6211897A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6211897A (en) | 1987-01-20 |
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