Man-made vitreous fibres and their production
AssigneeRockwool International A/S
InventorsErling Hansen, Povl Nissen, Soren Lund Jensen
Life of this patent
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Abstract
Mineral fiber products, in particular rigid bonded mineral fiber products, are provided which comprise composite mineral fibers having a coating-core configuration wherein the core provides at least 90% by weight of the fibers and is formed of mineral melt and the coating is coated onto the core. The mineral melt is chosen so that the fibers without coating have adequate biological solubility and the coating comprises a phosphate or hydrogen phosphate of alkali metal, quaternary ammonium or ammonium in an amount of at least 0.3% or by weight of the core. The coated fibers retain their biological solubility while improving resistance to ageing in use.
Claims34
A process for the production of composite man-made vitreous fibres comprising providing fibres formed from mineral melt and having the following composition, expressed by weight of oxide:
- SiO2 35-66 Al2O3 0-12 MgO 0-30 CaO 10-45 FeO (total iron) 0-15 Na2O + K2O 0-10 P2O5 0-10 B2O5 0-10 TiO2 0-10 Others 0-10
- the fibres having a solubility of at least 20 nm/day in Gamble's solution at pH 7.5 and 37° C.,
- providing a coating composition which comprises a salt which is a phosphate or hydrogen phosphate of ammonium, quaternary ammonium or alkali metal, and in which the amount of salt in the coating composition is not more than 0.2 wt. %,
- and coating this coating composition onto the fibres in an amount such that the salt is present on the fibres in an amount of at least 0.3% based on the weight of fibres.
A process for improving the ageing resistance of composite man-made vitreous fibres comprising providing a mineral melt formed from components having the following composition, expressed by weight of oxides:
- SiO2 35-66 Al2O3 0-12 MgO 0-30 CaO 10-45 FeO (total iron) 0-15 Na2O + K2O 0-10 P2O5 0-10 B2O3 0-10 TiO2 0-10 Others 0-10
- and forming the melt into fibres which have a solubility of at least 20 nm/day in Gamble's solution at pH 7.5 and 37° C.
- and coating onto the fibres a coating which comprises a salt which is phosphate or hydrogen phosphate of ammonium or quaternary ammonium or alkali metal in an amount such that the amount of salt applied is at least 0.3% based on the weight of the fibres,
- whereby the ageing resistance of the fibres is improved by the coating.
A method of insulation comprising providing a mineral fibre product which comprises
- composite man-made vitreous fibres which have a coating-core configuration wherein the core provides at least 90% by weight of the fibre and is formed of mineral melt formed from components having the following composition, expressed by weight of oxides:
- SiO2 35-66 Al2O3 0-12 MgO 0-30 CaO 10-45 FeO (total iron) 0-15 Na2O + K2O 0-10 P2O5 0-10 B2O3 0-10 TiO2 0-10 Others 0-10
- and chosen such that fibres formed from the core alone have a solubility of at least 20 nm/day in Gamble's solution at pH 7.5 and 37° C.
- and the coating is coated onto the core and comprises a salt which is a phosphate or hydrogen phosphate of ammonium or quaternary ammonium or alkali metal in an amount of at least 0.3% based on the weight of the core and using the product as insulation in an environment in which the product is exposed to humidity and/or condensation.
Dependencies are inferred from the claim text.