Carboxylic acid derivatives, method for the production...

Details Carboxylic acid derivatives, method for the production... Carboxylic acid derivatives, method for the production...

C - Chemistry, Metallurgy

08

G

C08G 69/40 (2006.01) C04B 24/04 (2006.01) C04B 24/08 (2006.01) C04B 24/24 (2006.01) C04B 24/26 (2006.01) C07D 307/60 (2006.01) C08G 63/52 (2006.01) C08G 65/332 (2006.01)

Patent

CA 2627009

The invention relates to carboxylic acid derivatives which are obtained by reacting an unsaturated dicarboxylic acid anhydride (A) with a hydrophobic reactive component (B) that contains at least one group reacting to carboxylic acid anhydrides and has a mean molecular weight of 200 to 50,000 Dalton. The inventive carboxylic acid derivatives are excellent as a substance for preventing efflorescence on surfaces of hardened cementious construction materials and/or rendering the corresponding cementious systems hydrophobic. Furthermore, said cementious products absorb considerably smaller amounts of water as a result of the inventive additives such that frost damage and premature rusting of the reinforcing steel can be significantly reduced.

L'invention concerne des dérivés d'acide carboxylique pouvant être obtenus par transformation d'un anhydride d'acide dicarboxylique (A) avec un composant réactif hydrophobe (B) comportant au moins un groupe réactif par rapport à des anhydrides d'acide carboxylique et présentant un poids moléculaire moyen de 200 à 50000 Dalton. Les dérivés d'acide carboxylique selon l'invention sont particulièrement adaptés à une utilisation en tant qu'agent anti-efflorescence sur la surface de matériaux de ciment durcis et/ou pour l'hydrophobation des systèmes de ciment correspondants. Par ailleurs, sous l'effet des additifs selon l'invention, les produits de ciment absorbent bien moins d'eau de telle manière qu'il est possible de réduire considérablement les dégâts du gel et une corrosion rapide de l'acier d'armature.

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