C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
261/50, 400/7338
C08K 3/30 (2006.01) C04B 24/22 (2006.01) C04B 24/30 (2006.01) C08G 12/32 (2006.01) C08G 12/34 (2006.01) C08G 12/40 (2006.01) C08K 5/00 (2006.01) C08L 61/28 (2006.01)
Patent
CA 1183624
ABSTRACT OF THE DISCLOSURE: Highly concentrated aqueous solutions of low viscosity of melamine/aldehyde resins are obtained by reacting to a precondensate in a first step melamine and an aldehyde in an alkaline medium and in the presence of water together with at least one compound (I), selected from the group, consisting of an alkali sulfite, an alkaline earth sulfite, an alkali sulfamate, an alkaline earth sulfamate, an amino sulfonic acid, an amino acid, an amino carboxylic acid, an amino dicarboxylic acid, a hydroxycarboxylic acid, a hydroxycarboxylic acid lactone, a polyhydroxy carboxylic acid lactone and a sulfamic acid, reacting then the so obtained mixture in a second step with at least one compound (II), selected from the group, consisting of an amino acid, an amino carboxylic acid, an amino dicarboxylic acid, a carboxylic acid, a hydroxy carboxylic acid, a hydroxy carboxylic acid lactone, a sulfamine acid, an amino sulfonic acid, a polyhydroxy carboxylic acid and a polyhydroxy carboxylic acid lactone, and then making alkaline the obtained resin solution by adding at least one basic compound (III). The resin solutions prepared according to this invention may be used as added substances for improving the quality of building materials containing inorganic binders.
397094
Burge Theodor A.
Meyer Theodor
Sulser Ulrich
Widmer Jurg
Osler Hoskin & Harcourt Llp
Sika Ag Vorm. Kaspar Winkler & Co.
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