Importance

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Abstract

An additive for alkali metal silicate solutions, comprising a quaternary ammonium compound having the general formula (1) R₁R₂R₃R₄N⁺OH⁻, wherein R₁, R₂, R₃ and R₄ which may be the same or different represent alkyl groups, hydroxy-substituted alkyl groups, alkaryl groups, hydroxy-substituted alkaryl groups comprising from 1 to 12 carbon atoms, or groups having the general formula —[CH₂]n-N⁺R₅R₆R₇ wherein n is an integer having a value of from 1 to 12, the group —[CH₂]n may be hydroxy-substituted, and R₅, R₆ and R₇ which may be the same or different represent alkyl groups, hydroxy-substituted alkyl groups, alkaryl groups or hydroxy-substituted alkaryl groups comprising from 1 to 12 carbon atoms; with the proviso that at least one of the groups R₁, R₂, R₃, R₄, R₅, R₆ and R₇ represents a hydroxy-substituted alkyl group or a hydroxy-substituted alkaryl group comprising at least 2 carbon atoms wherein the hydroxy substituent is not located on a carbon atom which is bonded to a nitrogen atom.

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First Claim