Glass composition, and information recording medium substrate, information recording medium, and information recording device each comprising the composition
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C03C-003/062
C03C-003/085
C03C-003/087
C03C-003/095
B32B-017/00
출원번호
US-0690756
(2000-10-18)
우선권정보
JP-0296448 (1999-10-19)
발명자
/ 주소
Shoichi Kishimoto JP
Akihiro Koyama JP
Hiroyuki Tanaka JP
출원인 / 주소
Nippon Sheet Glass Co., Ltd. JP
대리인 / 주소
Sughrue Mion, PLLC
인용정보
피인용 횟수 :
11인용 특허 :
6
초록▼
A glass composition is disclosed which has a high modulus of elasticity and a low density, i.e., has a high specific modulus. Also disclosed is an inexpensive glass composition which is suitable for use as an information recording medium substrate, for example, because it can be formed easily, is le
A glass composition is disclosed which has a high modulus of elasticity and a low density, i.e., has a high specific modulus. Also disclosed is an inexpensive glass composition which is suitable for use as an information recording medium substrate, for example, because it can be formed easily, is less apt to suffer devitrification, is suitable for mass production, and can be easily made to have high surface smoothness by polishing. The glass compositions comprise, in terms of mol %, 35 to 45% silicon dioxide (SiO2), 15 to 20% aluminum oxide (Al2O3), 3 to 10% lithium oxide (Li2O), 0.1 to 5% sodium oxide (Na2O), 15 to 30% magnesium oxide (MgO), 0 to 10% calcium oxide (CaO), 0 to 4% strontium oxide (SrO), 25 to 35% RO (MgO+CaO+SrO), 2 to 10% titanium dioxide (TiO2), 0.5 to 4% zirconium oxide (ZrO2), 4 to 12% TiO2+ZrO2, and 0 to 4% yttrium oxide (Y2O3).
대표청구항▼
1. A glass composition comprising, in terms of mol %,35 to 45% silicon dioxide (SiO2), 15 to 20% aluminum oxide (Al2O3), 3 to 10% lithium oxide (Li2O), 0.1 to 5% sodium oxide (Na2O), 15 to 30% magnesium oxide (MgO), 0 to 10% calcium oxide (CaO), 0 to 4% strontium oxide (SrO), 25 to 35% RO (MgO+CaO+S
1. A glass composition comprising, in terms of mol %,35 to 45% silicon dioxide (SiO2), 15 to 20% aluminum oxide (Al2O3), 3 to 10% lithium oxide (Li2O), 0.1 to 5% sodium oxide (Na2O), 15 to 30% magnesium oxide (MgO), 0 to 10% calcium oxide (CaO), 0 to 4% strontium oxide (SrO), 25 to 35% RO (MgO+CaO+SrO), 2 to 10% titanium dioxide (TiO2), 0.5 to 4% zirconium oxide (ZrO2), 4 to 12% TiO2+ZrO2, and 0 to 4% yttrium oxide (Y2O3).
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이 특허에 인용된 특허 (6)
Zou Xuelu,JPX ; Toratani Hisayoshi,JPX, Disc substrates for information recording discs and magnetic discs.
Zou Xuelu,JPX ; Toratani Hisayoshi,JPX, Method for selecting a material suitable for a substrate for information recording media, material selected using this m.
McGinnis, Peter B.; Hofmann, Douglas; Baker, David J.; Wingert, John W.; Bemis, Byron, Method of manufacturing S-glass fibers in a direct melt operation and products formed therefrom.
McGinnis, Peter Bernard; Hofmann, Douglas; Baker, David J.; Wingert, John W.; Bemis, Byron, Method of manufacturing high strength glass fibers in a direct melt operation and products formed there from.
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