Process for producing a glass for cathode ray tubes
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C03B-005/16
C03B-005/00
출원번호
US-0091402
(2002-03-07)
우선권정보
JP-2001-093372(2001-03-28)
발명자
/ 주소
Itoh,Hajime
Kitamura,Rei
Sakai,Mitsuyoshi
Sekine,Keito
Okada,Misao
출원인 / 주소
Asahi Glass Company, Limited
대리인 / 주소
Oblon, Spivak, McClelland, Maier &
인용정보
피인용 횟수 :
3인용 특허 :
19
초록▼
A process for producing a glass for cathode ray tubes, having a Sb2O3 content of from 0 to 0.19% as represented by mass percentage and containing H2O, which process comprises a step of melting a raw material in an atmosphere under a pressure of P0 to obtain a molten glass, and a step of vacuum degas
A process for producing a glass for cathode ray tubes, having a Sb2O3 content of from 0 to 0.19% as represented by mass percentage and containing H2O, which process comprises a step of melting a raw material in an atmosphere under a pressure of P0 to obtain a molten glass, and a step of vacuum degassing the molten glass in an atmosphere under a pressure PA which is lower than P0, wherein the pressure P of the molten glass is made to be at most (6.1 W+0.06) atm in the vacuum degassing step, wherein W is the content of said H2O as represented by mass percentage.
대표청구항▼
What is claimed is: 1. A process for producing glass for cathode ray tubes, which comprises: increasing water content in a raw material; melting the raw material in an atmosphere under a pressure of P0 to obtain a molten glass; vacuum degassing the molten glass in an atmosphere under a pressure of
What is claimed is: 1. A process for producing glass for cathode ray tubes, which comprises: increasing water content in a raw material; melting the raw material in an atmosphere under a pressure of P0 to obtain a molten glass; vacuum degassing the molten glass in an atmosphere under a pressure of PA, which is less than P0; wherein the pressure P of the molten glass is made to be at most (6.1 W+0.06) atm in the vacuum degassing step, and wherein W is the content of water in mass %; and wherein an obtained hardened glass has at most 0.1 bubbles/g. 2. The process for producing glass for cathode ray tubes according to claim 1, wherein the period of time during which the pressure P of the molten glass is made to be at most (6.1 W+0.06) atm, is at least 0.1 hour. 3. The process for producing glass for cathode ray tubes according to claim 1, wherein P0 is from 0.8 atm to 1.2 atm. 4. The process for producing glass for cathode ray tubes according to claim 1, wherein W is from 0.005 mass % to 0.05 mass %. 5. The process for producing glass for cathode ray tubes according to claim 1, wherein the glass for cathode ray tubes consists essentially of the following oxides: SiO2 45 to 70%, Al2O3 0 to 10%, Na2O 1 to 15%, K2O 3 to 15%, MgO 0 to 10%, CaO 0 to 10%, SrO 0 to 13%, BaO 0 to 16%, ZnO 0 to 5%, ZrO2 0 to 5%, TiO2 0 to 2%, CeO2 0 to 5%, B2O3 0 to 5%, Sb2O3 0 to 0.19%, H2O 0.005 to 0.05%, SnO2 0 to 5%, and SO3 0 to 0.4%. 6. The process for producing glass for cathode ray tubes according to claim 1, wherein the Sb2O3 is from 0 mass % to 0.029 mass %. 7. The process for producing glass for cathode ray tubes according to claim 1, wherein the raw material contains no SnO2. 8. The process for producing glass for cathode ray tubes according to claim 1, wherein the raw material comprises SO3 in an amount that ranges from 0.05 mass % to 0.4 mass %. 9. The process for producing glass for cathode ray tubes according to claim 1, wherein said hardened glass comprises at most 0.02 bubbles/g. 10. The process for producing glass for cathode ray tubes according to claim 1, wherein bubbles formed during said vacuum degassing have a bubble volume expansion ratio is less than 100; wherein the bubble volume expansion ratio is expressed as a ratio of the average volume of a bubble present in the molten glass in an atmosphere under a pressure P A to the average volume of a bubble in the molten glass in an atmosphere under a pressure P0. 11. The process for producing glass for cathode ray tubes according to claim 1, wherein the molten glass in an atmosphere under a pressure PA is at a temperature from 1250째 C. to 1350째 C. 12. The process for producing glass for cathode ray tubes according to claim 1, wherein the vacuum degassing occurs in a vacuum degassing tank and the depth of the molten glass in the vacuum degassing tank ranges from at least 100 mm to at most 400 mm. 13. A process for producing glass for cathode ray tubes, which comprises: melting a raw material in an atmosphere under a pressure of P0 to obtain a molten glass; increasing a water content in the molten glass; vacuum degassing the molten glass in an atmosphere under a pressure of PA, which is lower than P0; wherein the pressure P of the molten glass is made to be at most (6.1 W+0.06) atm in the vacuum degassing step, and wherein W is the content of water in mass %; and wherein an obtained hardened glass has at most 0.1 bubbles/g. 14. The process for producing glass for cathode ray tubes according to claim 13, wherein the period of time during which the pressure P of the molten glass is made to be at most (6.1 W+0.06) atm, is at least 0.1 hour. 15. The process for producing glass for cathode ray tubes according to claim 13, wherein P0 is from 0.8 atm to 1.2 atm. 16. The process for producing glass for cathode ray tubes according to claim 13, wherein W is from 0.005 mass % to 0.05 mass %. 17. The process for producing glass for cathode ray tubes according to claim 13, wherein the glass for cathode ray tubes consists essentially of the following oxides: SiO2 45 to 70 mass %, Al2O3 0 to 10 mass %, Na2O 1 to 15 mass %, K2O 3 to 15 mass %, MgO 0 to 10 mass %, CaO 0 to 10 mass %, SrO 0 to 13 mass %, BaO 0 to 16 mass %, ZnO 0 to 5 mass %, ZrO2 0 to 5 mass %, TiO2 0 to 2 mass %, CeO2 0 to 5 mass %, B2O3 0 to 5 mass %, Sb2O3 0 to 0.19 mass %, H2O 0.005 to 0.05 mass %, SnO2 0 to 5 mass %, and SO3 0 to 0.4 mass %. 18. The process for producing glass for cathode ray tubes according to claim 13, wherein the Sb2O3 is from 0 mass % to 0.029 mass %. 19. The process for producing glass for cathode ray tubes according to claim 13, wherein the raw material contains no SnO2. 20. The process for producing glass for cathode ray tubes according to claim 13, wherein the raw material comprises SO3 in an amount that ranges from 0.05 mass % to 0.4 mass %. 21. The process for producing glass for cathode ray tubes according to claim 13, wherein said hardened glass comprises at most 0.02 bubbles/g. 22. The process for producing glass for cathode ray tubes according to claim 13, wherein bubbles formed during said vacuum degassing have a bubble volume expansion ratio is less than 100; wherein the bubble volume expansion ratio is expressed as a ratio of the average volume of a bubble present in the molten glass in an atmosphere under a pressure PA to the average volume of a bubble in the molten glass in an atmosphere under a pressure P0. 23. The process for producing glass for cathode ray tubes according to claim 13, wherein the molten glass in an atmosphere under a pressure PA is at a temperature from 1250째 C. to 1350째 C. 24. The process for producing glass for cathode ray tubes according to claim 13, wherein the vacuum degassing occurs in a vacuum degassing tank and the depth of the molten glass in the vacuum degassing tank ranges from at least 100 mm to at most 400 mm. 25. The process for producing glass for cathode ray tubes according to claim 13, wherein the increasing water content in the molten glass occurs by burning fuel in the presence of an oxygen gas comprising an oxygen concentration of at least 90 vol %.
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