Water soluble glass composition

C - Chemistry – Metallurgy – 03 – C

Patent

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C03C 3/16 (2006.01) C03C 3/19 (2006.01) C03C 3/247 (2006.01) C03C 4/00 (2006.01) C03C 13/00 (2006.01)

Patent

CA 2333687

A composition for a water soluble glass is described. The composition is unusual in that it contains no or very small quantities (up to 5 mole %) of alkali earth metal compounds. The composition typically comprises P2O5: 40 to 60 mole %; B2O3: 0 to 10 mole %; Na2O: 30 to 40 mole %; K2O: 5 to 10 mole %; Ag2O: 0 to 5 mole %; and up to a total of 5 mole % of other compounds such as CaO, MgO etc. The composition is especially suitable for processing into water soluble glass fibres or wool since the melting point is very low, usually less than 350 ~C.

L'invention concerne des compositions utilisées pour la formation de verre hydrosoluble, inédites en ce qu'elles sont dépourvues de composés de métaux alcalino-terreux ou renferment des quantités très faibles de ces composés (jusqu'à 5 %, en moles). En règle générale, les compositions comprennent, en moles, de 40 à 60 % de P¿2?O¿5?, de 0 à 10 % de B¿2?O¿3?, de 30 à 40 % de Na¿2?O, de 5 à 10 % de K¿2?O, et de 0 à 5 % d'Ag¿2?O. Elles renferment, en moles, jusqu'à 5 % au total d'autres composés comme CaO, MgO, etc. Ce type de composition est particulièrement apte au traitement visant à obtenir de la fibre ou de la laine de verre hydrosoluble, car son point de fusion est très bas, généralement inférieur à 350· C.

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