WO1991016273A1 - Compositions de verre de calcia-alumino-boro-silicate - Google Patents
Compositions de verre de calcia-alumino-boro-silicate Download PDFInfo
- Publication number
- WO1991016273A1 WO1991016273A1 PCT/US1991/002334 US9102334W WO9116273A1 WO 1991016273 A1 WO1991016273 A1 WO 1991016273A1 US 9102334 W US9102334 W US 9102334W WO 9116273 A1 WO9116273 A1 WO 9116273A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- glass
- cao
- composition according
- glass composition
- microspheres
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C11/00—Multi-cellular glass ; Porous or hollow glass or glass particles
- C03C11/002—Hollow glass particles
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
- C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
Definitions
- the invention relates to glass compositions for use in the preparation of glass microspheres.
- Hollow glass microspheres are used, for example, as bulk, lightweight fillers for reinforced plastic components for the motor industry. They find use also as hollow microbubbles for adhesives. They can be prepared, for example, by pulsing an inert gas, such as argon into a continuous stream of molten glass in order to produce individual microspheres. For best results, the molten glass should be at a temperature such that the melt has a viscosity of about 2 Pas (20 poise). This temperature is known as the 20 poise temperature (20 PT). The glass compositions previously proposed for use in the preparation of hollow glass microspheres in this way have had 20 PT values in the region of 1440° to 1450°C.
- a standard E- Glass composition (analyzing 53.4 wt % SiO 2 , 13.9 wt % Al 2 O 3 , 8.9 wt % B 2 O 3 , 21.7 wt % CaO, 0.3 wt % Na 2 O and 0.7 wt % K 2 O), such as is used in providing glass fibers for reinforcing plastics, has a 20 PT of 1447°C.
- a borosilicate glass composition used in the preparation of glass microspheres (analyzing 44.7 wt % SiO 2 , 12.5 wt %
- 0.7 wt % K 2 O has a PT of 1444°C.
- Such high 20 PT values can cause a reduced service life for metal parts, such as platinum bushings, employed in the manufacture of microspheres and are of course associated with high energy requirements. Accordingly it is desired to provide glass compositions suitable for use in the preparation of glass microspheres but having lower 20 PT values than the glass compositions hitherto used.
- This invention provides glass compositions for use in the preparation of glass microspheres comprising 38 to 44% SiO 2 , 14 to 22% B 2 O 3 , 9 to 16% Al 2 O 3 , 22 to 26% CaO, 0 to 8% Na 2 O, 0 to 2 % Li 2 O, 0 to 2% K 2 O and 0 to 1% Fe 2 O 3 , the sum of B 2 O 3 and Na 2 O being at least 19%, said percentages being by weight.
- a portion of the CaO in the composition such as up about 50%, may be substituted by MgO.
- the glass composition comprises 39 to 43% SiO 2 , 19 to 22% B 2 O 3 , 9 to 13% Al 2 O 3 , 22 to 26% CaO and optionally MgO, 4 to 6% Na 2 O, 0 to 1% K 2 O and 0.2 to 0.4% Fe 2 O 3 .
- a particularly preferred composition is one which consists essentially of about 40% SiO 2 , about
- the glass compositions provided in accordance with this invention preferably have 20 PT values below about 1350°C, especially below 1300°C.
- the B 2 O 3 content either alone or combined with the Na 2 O content, has an important effect in reducing the 20 PT value.
- the B 2 O 3 content is too high, say 25 to 30 wt %, the glass becomes opalescent and its viscosity is undesirably increased.
- the optimum B 2 O 3 content is from 20 to 21% when the glass composition contains 0 to 5% Na 2 O.
- a particularly preferred Na 2 O content is about 5 wt % since it has been found that this amount of Na 2 O can be more effective in lowering the 20 PT value than a lower amount (e.g. 2.5 wt %) or higher amount (e.g. about 7.5 wt %).
- Weight for weight Li 2 O is more effective in reducing the viscosity of a glass (i.e. is a better flux) than Na 2 O, but is more expensive.
- Al 2 O 3 is a refractory material and increases the viscosity of most glasses. It is generally added to glasses to improve their aqueous durability. The optimum amount is from 9 to 14%, especially 9 to 11%, Al 2 O 3 .
- the glass compositions contain CaO rather than both CaO and MgO . Nevertheless mixtures of CaO and MgO can be used if desired, the amount of MgO suitably being up to about half the total amount of CaO and MgO.
- Fe 2 O 3 is normally present in E-type glasses to improve radiation heat transfer into the glass during gas firing and heat radiation from fibers during cooling. It can be present, for example in amounts of up to 1 wt %, preferably 0.2 to 0.4 wt %, especially about 0.3 wt %, in the glass compositions of this invention to improve heat transfer. Fe 2 O 3 also contributes to the fluxing action.
- This invention also relates to the use of the glass compositions in the preparation of glass microspheres.
- This can suitably be done by pulsing an inert gas, preferably argon, into a continuous melt of said glass compositions to produce individual microspheres.
- the melt will preferably have a viscosity of about 2 Pas (20 poise).
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
Abstract
Des compositions de verre utilisées dans la préparation de microsphères de verre et ayant des températures de fusion réduites produisant une viscosité de 2 Pas (20 poise), comprennent de 38 à 44 % de SiO2, 14 à 22 % de B2O3, 9 à 16 % de Al2O3, 22 à 26 % de CaO et facultativement de MgO, 0 à 8 % de Na2O, 0 à 2 % de Li2O, 0 à 2 % de K2O et O à 1 % de Fe2O3, la somme de B2O3 et Na2O représentant au moins 19 %, lesdits pourcentages étant des pourcentages en poids.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9009246.1 | 1990-04-25 | ||
GB9009246A GB2243604A (en) | 1990-04-25 | 1990-04-25 | Glass compositions |
US554,059 | 1990-07-16 | ||
US07/554,059 US5100842A (en) | 1990-04-25 | 1990-07-16 | Glass compositions |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991016273A1 true WO1991016273A1 (fr) | 1991-10-31 |
Family
ID=26296991
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1991/002334 WO1991016273A1 (fr) | 1990-04-25 | 1991-04-04 | Compositions de verre de calcia-alumino-boro-silicate |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO1991016273A1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2017236A1 (fr) * | 2006-05-02 | 2009-01-21 | Nippon Sheet Glass Company, Limited | Composition de verre et entretoise de verre utilisant ladite composition |
WO2015013129A1 (fr) * | 2013-07-23 | 2015-01-29 | Rogers Corporation | Matériaux de circuit, stratifiés de circuit et procédés de fabrication de ces derniers |
EP3184494A1 (fr) * | 2015-12-21 | 2017-06-28 | ADF Materials GmbH | Composition chimique pour la production de particules sphériques en verre creux présentant une résistance élevée à la compression |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2681289A (en) * | 1950-03-04 | 1954-06-15 | Gustin Bacon Mfg Co | Glass composition |
US2834738A (en) * | 1954-08-25 | 1958-05-13 | Ici Ltd | Production of skeletal glass catalysts |
US3150947A (en) * | 1961-07-13 | 1964-09-29 | Flex O Lite Mfg Corp | Method for production of glass beads by dispersion of molten glass |
US3207588A (en) * | 1962-03-16 | 1965-09-21 | Owens Corning Fiberglass Corp | Glass foam |
US3459630A (en) * | 1965-09-23 | 1969-08-05 | Pittsburgh Corning Corp | Arcuately shaped cellular glass article and method of making the same |
US3843376A (en) * | 1971-04-24 | 1974-10-22 | Philips Corp | Method of manufacturing a mixture for a borosilicate glass |
US4215033A (en) * | 1978-09-08 | 1980-07-29 | American Dental Association Health Foundation | Composite dental material |
US4983550A (en) * | 1988-08-24 | 1991-01-08 | Potters Industries, Inc. | Hollow glass spheres |
-
1991
- 1991-04-04 WO PCT/US1991/002334 patent/WO1991016273A1/fr unknown
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2681289A (en) * | 1950-03-04 | 1954-06-15 | Gustin Bacon Mfg Co | Glass composition |
US2834738A (en) * | 1954-08-25 | 1958-05-13 | Ici Ltd | Production of skeletal glass catalysts |
US3150947A (en) * | 1961-07-13 | 1964-09-29 | Flex O Lite Mfg Corp | Method for production of glass beads by dispersion of molten glass |
US3207588A (en) * | 1962-03-16 | 1965-09-21 | Owens Corning Fiberglass Corp | Glass foam |
US3459630A (en) * | 1965-09-23 | 1969-08-05 | Pittsburgh Corning Corp | Arcuately shaped cellular glass article and method of making the same |
US3843376A (en) * | 1971-04-24 | 1974-10-22 | Philips Corp | Method of manufacturing a mixture for a borosilicate glass |
US4215033A (en) * | 1978-09-08 | 1980-07-29 | American Dental Association Health Foundation | Composite dental material |
US4983550A (en) * | 1988-08-24 | 1991-01-08 | Potters Industries, Inc. | Hollow glass spheres |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2017236A1 (fr) * | 2006-05-02 | 2009-01-21 | Nippon Sheet Glass Company, Limited | Composition de verre et entretoise de verre utilisant ladite composition |
EP2017236A4 (fr) * | 2006-05-02 | 2009-12-16 | Nippon Sheet Glass Co Ltd | Composition de verre et entretoise de verre utilisant ladite composition |
WO2015013129A1 (fr) * | 2013-07-23 | 2015-01-29 | Rogers Corporation | Matériaux de circuit, stratifiés de circuit et procédés de fabrication de ces derniers |
US9258892B2 (en) | 2013-07-23 | 2016-02-09 | Rogers Corporation | Circuit materials, circuits laminates, and method of manufacture thereof |
CN109951952A (zh) * | 2013-07-23 | 2019-06-28 | 罗杰斯公司 | 电路组件 |
CN109951952B (zh) * | 2013-07-23 | 2022-02-01 | 罗杰斯公司 | 电路组件 |
EP3184494A1 (fr) * | 2015-12-21 | 2017-06-28 | ADF Materials GmbH | Composition chimique pour la production de particules sphériques en verre creux présentant une résistance élevée à la compression |
WO2017108831A1 (fr) * | 2015-12-21 | 2017-06-29 | Adf Materials Gmbh | Composition chimique pour la production de particules de verre sphériques creuses à haute résistance à la compression |
US10414689B2 (en) | 2015-12-21 | 2019-09-17 | Omya International Ag | Chemical composition for production of hollow spherical glass particles with high compressive strength |
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