Glass composition and substrate for information recording media comprising the same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C03C-003/085
C03C-003/087
B32B-017/00
출원번호
US-0377149
(1999-08-19)
우선권정보
JPX, 19980911, 10-258933
발명자
/ 주소
Kurachi Junji,JPX
Koyama Akihiro,JPX
Kishimoto Shoichi,JPX
Yamamoto Nobuyuki,JPX
출원인 / 주소
Nippon Sheet Glass Co., Ltd., JPX
대리인 / 주소
Sughrue Mion, PLLC
인용정보
피인용 횟수 :
16인용 특허 :
12
초록▼
A glass composition is disclosed which has a high modulus of elasticity (Young's modulus) and a high rigidity (modulus of elasticity/specific gravity) and is capable of being effectively inhibited from bending or vibrating. Also disclosed is a substrate for information recording media which comprise
A glass composition is disclosed which has a high modulus of elasticity (Young's modulus) and a high rigidity (modulus of elasticity/specific gravity) and is capable of being effectively inhibited from bending or vibrating. Also disclosed is a substrate for information recording media which comprises the glass composition. The glass composition comprises the following components, in terms of mol %: 55 to 65% SiO.sub.2, 0.5 to less than 6% Al.sub.2 O.sub.3, 12 to 22% Li.sub.2 O, 0 to 5% Na.sub.2 O, 0 to 10% TiO.sub.2, 0 to 3% ZrO.sub.2, 0 to 8% MgO, 0 to 18% CaO, and 0 to 6% SrO, provided that the content of RO (RO=MgO+CaO+SrO) is 5 to 18%.
대표청구항▼
[ What is claimed is:] [1.]1. A glass composition consisting of the following components, in terms of mol %:55 to 65% SiO.sub.2,0.5 to less than 6% Al.sub.2 O.sub.3,12 to 22% Li.sub.2 O,0 to 5% Na.sub.2 O,0 to 10% TiO.sub.2,0 to 3% ZrO.sub.2,O to 8% MgO,0 to 18% CaO, and0 to 6% SrO, vided that the c
[ What is claimed is:] [1.]1. A glass composition consisting of the following components, in terms of mol %:55 to 65% SiO.sub.2,0.5 to less than 6% Al.sub.2 O.sub.3,12 to 22% Li.sub.2 O,0 to 5% Na.sub.2 O,0 to 10% TiO.sub.2,0 to 3% ZrO.sub.2,O to 8% MgO,0 to 18% CaO, and0 to 6% SrO, vided that the content of RO (RO=MgO+CaO+SrO) is 5 to 18% and at least one of As.sub.2 O.sub.3, Sb.sub.2 O.sub.3, SO.sub.3, SnO.sub.2, Fe.sub.2 O.sub.3, CoO, Cl, F, K.sub.2 O, and Y.sub.2 O.sub.3 is amount of up to 3 mol %, and wherein the proportion of Na.sub.2 O to Li.sub.2 O is in the range of from 1/1 to 1/5 and that of MgO to CaO is in the range of from 1/4 to 1/1.
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