Process for producing alkali-free aluminosilicate glass
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C03B-005/18
C03B-005/00
C03B-005/225
C03C-003/085
C03C-003/076
C03C-003/087
C03C-003/091
출원번호
US-0396146
(2003-03-25)
우선권정보
DE-102 14 449(2002-03-30)
발명자
/ 주소
Ott,Franz
Naumann,Karin
Becker,Otmar
Diezel,Ralf
출원인 / 주소
Schott AG
인용정보
피인용 횟수 :
5인용 특허 :
11
초록
The process of the invention produces alkali-free aluminosilicate glass having an Al2O3-content of more than 12% by weight with the addition of from 0.005% by weight to 0.6% by weight of sulfate for batch formulation.
대표청구항▼
We claim: 1. A process of producing aluminosilicate glass containing more than 13.5% by weight, based on oxide content, of aluminum oxide and free of alkali metals, apart from inevitable impurities, said process comprising the steps of: a) formulating a batch of raw materials; b) adding at least on
We claim: 1. A process of producing aluminosilicate glass containing more than 13.5% by weight, based on oxide content, of aluminum oxide and free of alkali metals, apart from inevitable impurities, said process comprising the steps of: a) formulating a batch of raw materials; b) adding at least one fining agent to said batch; c) melting the batch to form molten glass, said melting including fining and homogenizing; and d) after the melting, hot-forming the molten glass formed from the batch; wherein the batch contains from 0.005% by weight to 0.6% by weight of at least one sulfate, based on SO3, but wherein the batch does not contain any evaporating fining agents; and whereby said aluminosilicate glass is formed containing more than 13.5% by weight, based on oxide content, of said aluminum oxide and free of said alkali metals, apart from said inevitable impurities. 2. The process as defined in claim 1, wherein the batch contains from 0.03% by weight to 0.2% by weight of said at least one sulfate, based on SO3. 3. The process as defined in claim 1, wherein the batch contains from 0.015 to 1% by of Fe2O3. 4. The process as defined in claim 1, wherein the batch contains from 0.03 to 0.45% by weight of Fe2O3. 5. The process as defined in claim 1, wherein the batch has a composition comprising, in % by weight, based on oxide content: SiO2 46-70, Al2O3 >13.5-27, B2O3 0-15, MgO 0-10, CaO 0-14, SrO 0-15, BaO 0-25, with MgO + CaO + SrO + BaO ≧8, ZnO 0-10, ZrO2 0-5, TiO2 0-3, P2O5 0-9. 6. The process as defined in claim 1, wherein said batch contains at least 0.5% by weight of said B2O3. 7. The process as defined in claim 6, wherein said batch contains at most 20% by weight of said MgO+CaO+SrO+BaO. 8. The process as defined in claim 1, wherein the batch has a composition comprising, in % by weight, based on oxide content: SiO2 46-64, Al2O3 >13.5-26, B2O3 0-5.5, MgO 0-7, CaO 3-14, SrO 0-11, BaO 6-25, with MgO + CaO + SrO + BaO ≧8, ZrO2 0-5, TiO2 0-0.5, P2O5 0-9. 9. The process as defined in claim 8, wherein said batch contains, in % by weight, based on oxide content, >65-64 of said SiO2, >13.5-18 of said Al2O3, 5-14 of said CaO, 0-8 of said SrO, 6-17 of said BaO, 0-2 of said ZrO2. 10. The process as defined in claim 9, wherein said batch contains, in % by weight, based on oxide content, 59-62 of said SiO 2, >13.5-15.5 of said Al2O3, 3-5.5 of said B 2O3, 2.5-5 of said MgO, 8.2-10.5 of said CaO, 8.5-9.5 of said BaO, 0-1.5 of said ZrO2. 11. The process as defined in claim 9, wherein said batch contains, in % by weight, based on oxide content, >58-62 of said SiO2, 14-17.5 of said Al2O3, 0-1 of said B 2O3, 5.5-14 of said CaO, 0-8 of said SrO, 6-17 of said SaO and 0-1.5 of said ZrO2. 12. The process as defined in claim 11, wherein said batch contains, in % by weight, based on oxide content, 15-17.5 of said Al 2O3, 0.2-0.7 of said B2O3, 0<1 of said MgO, 6-10 of said BaO and 0.05-1 of said ZrO2. 13. The process as defined in claim 8, wherein said batch contains, in % by weight, based on oxide content, 46-63 of said SiO 2, >13.5-25 of said Al2O3, 0-5 of said MgO, 6-15 of said BaO, 0.1-5 of said ZrO2, 0.1-9 of said P2 O5 and wherein MgO+CaO+SrO+BaO ≦25 and SrO+BaO ≧10. 14. The process as defined in claim 1, wherein said batch contains from 0 to 2 percent by weight, based on oxide content, of each of Sb2O3, CeO2, MoO3, WO3 and V2O5; from 0 to 1 percent by weight, based on oxide content, of each of As2O3 and SnO2, and wherein Sb2O3+As2O3 +CeO2+ SnO2+MoO3+WO3+V2O5 is contained in said batch in an amount between 0 and 3% by weight, based on oxide content. 15. The process as defined in claim 1, wherein said at least one sulfate is selected from the group consisting of CaSO4, ZnSO4, MgSO4, Na2SO4 and SrSO 4. 16. The process as defined in claim 1, wherein said batch contains BaSO4.
Maeda Kei (Yokohama JPX) Nakao Yasumasa (Yokohama JPX) Kushitani Hideki (Yokohama JPX) Ito Setsuro (Yokohama JPX), Glass composition for a substrate, and substrate for plasma display made thereof.
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