Glass compositions, fibers and methods of making same
US4026715A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1974 |
| Grant date | May 31, 1977 |
| Priority date | — |
| Expiry date | Aug 22, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C3/087
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This disclosure relates to fiberizable glass compositions, fibers and the method of making textile glass fibers which are boron and fluorine free. Boron and fluorine have now been recognized as potential pollutants in the manufacture of fiberizable glasses and glass fibers and the following disclosure eliminates these pollutants by substituting TiO.sub.2, MgO and ZnO in the basic three component glass composition of SiO.sub.2, Al.sub.2 O.sub.3 and CaO. The preferred glass composition consists essentially of, by weight, 54.5 to 60% SiO.sub.2, 9 to 14.5% Al.sub.2 O.sub.3, 17 to 24% CaO, 2 to 4% TiO.sub.2, 1.5 to 4% MgO and 1 to 6% RO, wherein RO is an oxide selected from the group consisting of ZnO, SrO and BaO, calculated as ZnO. The preferred composition may also include alkali metal oxides selected from the group consisting of Na.sub.2 O, K.sub.2 O and Li.sub.2 O.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.