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US 5,432,130 AGranted
Opalescent glass
AssigneeIvoclar AG
InventorsVolker Rheinberger, Wolfram Hoeland, Martin Frank
Life of this patent
Estimating the term…
Abstract
An opalescent glass is described which is characterized by a continuous glass phase and a discontinuous glass phase dispersed therein, and which can be used as dental material or as a constituent of dental materials.
Claims10
Opalescent glass having a continuous glass phase and a discontinuous glass phase dispersed therein, and consisting essentially of the following components:
- ______________________________________ Component Wt. % ______________________________________ SiO.sub.2 48.0 to 66.0 B.sub.2 O.sub.3 0 to 1.0 Me(III).sub.2 O.sub.3 5.8 to 20.0 Me(I).sub.2 O 6.0 to 22.0 Me(II)O 3.5 to 16.0 Me(IV)O.sub.2 0.5 to 10.0 P.sub.2 O.sub.5 0.5 to 5.0 CeO.sub.2 0 to 3.0 ______________________________________
- where
- a) the quantity of Me (III).sub.2 O.sub.3 quoted is formed of 5.8 to 20.0 wt. % Al.sub.2 O.sub.3 and 0 to 6.0 wt. % La.sub.2 O.sub.3 ;
- b) the quantity of Me(I).sub.2 O quoted is formed of 3.0 to 15.0 wt. % K.sub.2 O, 3.0 to 12.0 wt. % Na.sub.2 O and 0 to 2.5 wt. % Li.sub.2 O;
- c) the quantity of Me(II)O quoted is formed of 0 to 10.0 wt. % CaO, 0 to 7.5 wt. % BaO, 0 to 9.0 wt. % MgO, 0 to 3.5 wt. % ZnO and 0 to 8.5 wt. % SrO;
- and
- d) the quantity of Me(IV)O.sub.2 quoted is formed of 0 to 5.0 wt. % TiO.sub.2 and 0 to 5.0 wt. % ZrO.sub.2.
4 more elements
A process for producing an opalescent glass having a continuous phase and a discontinuous glass phase dispersed therein, the process comprising:
- (1) melting starting materials to form a homogeneous glass melt comprising the following components:
- ______________________________________ Component Wt. % ______________________________________ SiO.sub.2 48.0 to 66.0 B.sub.2 O.sub.3 0 to 1.0 Me(III).sub.2 O.sub.3 5.8 to 20.0 Me(I).sub.2 O 6.0 to 22.0 Me(II)O 3.5 to 16.0 Me(IV)O.sub.2 0.5 to 10.0 P.sub.2 O.sub.5 0.5 to 5.0 CeO.sub.2 0 to 3.0 ______________________________________
- where
- a) the quantity of Me(III).sub.2 O.sub.3 quoted is formed of 5.8 to 20.0 wt. % Al.sub.2 O.sub.3 and 0 to 6.0 wt. % La.sub.2 O.sub.3 ;
- b) the quantity of Me(I).sub.2 O quoted is formed of 3.0 to 15.0 wt. % K.sub.2 O, 3.0 to 12.0 wt. % Na.sub.2 O and 0 to 2.5 wt. % Li.sub.2 O;
- c) the quantity of Me(II)O quoted is formed of 0 to 10.0 wt. % CaO, 0 to 7.5 wt. % BaO, 0 to 9.0 wt. % MgO, 0 to 3.5 wt. % ZnO and 0 to 8.5 wt. % SrO;
- and
- d) the quantity of Me(IV)O.sub.2 quoted is formed of 0 to 5.0 wt. % TiO.sub.2 and 0 to 5.0 wt. % ZrO.sub.2 ;
- and thereafter optionally
- (2) subjecting the glass prepared in step (1) to heat treatment in the range of from 950.degree. C. to 1,100.degree. C.
7 more elements
Dependencies are inferred from the claim text.