JP6668220B2 - 改良された化学的および機械的耐久性を有するガラス組成物 - Google Patents
改良された化学的および機械的耐久性を有するガラス組成物 Download PDFInfo
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- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 claims description 40
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- 238000000034 method Methods 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
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- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
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- 239000005358 alkali aluminosilicate glass Substances 0.000 description 1
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- 238000002144 chemical decomposition reaction Methods 0.000 description 1
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- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 1
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- C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
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- B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
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- C03C3/00—Glass compositions
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- C03C3/00—Glass compositions
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- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
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- C03C2204/00—Glasses, glazes or enamels with special properties
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Description
6種の例示的な本発明によるガラス組成物(組成物A〜F)を調製した。各例示的ガラス組成物の具体的組成は以下の表1で報告されている。各例示的ガラス組成物について複数の試料を製作した。各組成の1つの試料セットを少なくとも5時間、450℃の温度で100%KNO3の溶融塩浴中でイオン交換して、試料の表面内に圧縮層を誘発した。圧縮層は、少なくとも500MPaの表面圧縮応力と少なくとも45μmの層深さを有していた。
3種の例示的な本発明によるガラス組成物(組成物G〜I)と3種の比較用ガラス組成物(組成物1〜3)を調製した。各組成物中でアルカリ酸化物対アルミナ(すなわちY:X)の比を変動させて、結果として得たガラス溶融物およびガラスのさまざまな特性に対するこの比の効果を査定した。例示的な本発明によるガラス組成物と比較用ガラス組成物の各々の具体的組成は、表2に報告されている。各ガラス組成物から形成された溶融物の歪点、焼鈍点および軟化点を決定し、表2に報告している。さらに、結果として得たガラスの熱膨張係数(CTE)、密度、および応力光学係数(SOC)も決定し、表2に報告している。各々の例示的な本発明によるガラス組成物と各々の比較用ガラス組成物から形成されたガラス試料の耐加水分解性を、450℃で5時間100%KNO3の溶融塩浴中でイオン交換の前後両方においてISO720規格に準じて決定した。イオン交換されたこれらの試料について、圧縮応力を、基本応力計(FSM)計器を用いて、測定された応力光学係数(SOC)に基づく圧縮応力値で決定した。FSM計器は、複屈折ガラス表面内およびこの表面から外に光を結合させる。その後、測定された複屈折を材料定数、応力光学係数または光弾性係数(SOCまたはPEC)を通して応力に関連づけし、2つのパラメータすなわち最大表面圧縮応力(CS)と交換済み層深さ(DOL)を得る。ガラス中のアルカリイオンの拡散率および時間の平方根あたりの応力変化も決定した。ガラスの拡散率(D)を測定された層深さ(DOL)およびイオン交換時間(t)から以下の関係式にしたがって計算する:DOL=約1.4*sqrt(4*D*t)。拡散率は、アレニウスの関係式にしたがって温度と共に増加し、そのため特定の温度で報告されている。
3種の例示的な本発明によるガラス組成物(組成物J〜L)および3種の比較用ガラス組成物(組成物4〜6)を調製した。ガラス組成物中のMgOおよびCaOの濃度を変動させて、MgO富有組成物(例えば組成物J〜Lと4)およびCaO富有組成物(すなわち組成物5〜6)の両方を生成した。MgOおよびCaOの相対的量も同様に、ガラス組成物が(CaO/(CaO+MgO))について異なる値を有するような形で変動させた。例示的な本発明によるガラス組成物および比較用ガラス組成物各々の具体的組成は、以下で表3中に報告されている。各組成物の特性は、実施例2に関して以上で記述した通りに決定した。
3種の例示的な本発明によるガラス組成物(組成物M〜O)および3種の比較用ガラス組成物(組成物7〜9)を調製した。ガラス組成物中のB2O3の濃度を0モル%〜約4.6モル%まで変動させて、結果として得られるガラスがB2O3/(R2O−Al2O3)比について異なる値を有するようにした。例示的な本発明によるガラス組成物および比較用ガラス組成物の各々の具体的組成は以下で表4中に報告されている。各ガラス組成物の特性は、実施例2および3に関して以上で記述した通りに決定した。
Claims (6)
- 医薬品パッケージ用ガラスであって、
70モル%〜80モル%のSiO2と、
MgOおよびCaOを含有するアルカリ土類酸化物であって、CaOの量は0.07モル%〜4モル%であり、(CaO(モル%)/(CaO(モル%)+MgO(モル%)) )比は0.5以下である、アルカリ土類酸化物と、
6モル%〜8モル%のAl2O3と、Na2OおよびK2Oを含有する、9モル%以上18モル%以下のアルカリ酸化物であって、Na2Oの量は2モル%〜15モル%であり、かつK2Oの量は3モル%以下である、アルカリ酸化物と、
0〜4モル%のB2O3と、
を含み、B2O3/(R2O−Al2O3)の比は0以上かつ0.3未満である、ガラス組成を有する、医薬品パッケージ用ガラス。 - 前記アルカリ酸化物が、8モル%超の量でNa2Oを含む、請求項1記載の医薬品パッケージ用ガラス。
- 70×10−7K−1未満の熱膨張係数を有する、請求項1記載の医薬品パッケージ用ガラス。
- MgOの濃度がCaOの濃度よりも高い、請求項1記載の医薬品パッケージ用ガラス。
- (CaO(モル%)/(CaO(モル%)+MgO(モル%)))比が0.5未満である、請求項1記載の医薬品パッケージ用ガラス。
- 該ガラスはイオン交換により強化可能であり、350℃〜500℃の温度で30時間未満の時間の100%KNO3の溶融塩浴中でのイオン交換により強化されたときに10μm以上の層深さおよび250MPa以上の表面圧縮応力を有する圧縮応力層を有するものであり、および
該ガラスはISO720に準じた少なくともHGA2の耐加水分解性を有する、請求項1から5いずれか1項記載の医薬品パッケージ用ガラス。
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