Pulverulent polycondensation products

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 24/30 (2006.01) C08J 3/12 (2006.01) C08K 3/22 (2006.01) C08K 3/36 (2006.01) C08L 61/14 (2006.01)

Patent

CA 2632942

Pulverulent polycondensation products are described, comprising a) from 5 to 95% by weight of a polycondensation product based on an aromatic or heteroaromatic compound (A) having from 5 to 10 carbon atoms or hetero~atoms having at least one oxyethylene or oxypropylene radical and an aldehyde (C) selected from the group of formaldehyde, glyoxylic acid and benzaldehyde or mixtures thereof, and b) from 5 to 95% by weight of a finely divided mineral support material having a specific surface area of from 0.5 to 500 m2/g (according to BET to DIN 66 131). The inventive pulverulent polycondensation products are outstandingly suitable in building material mixtures in an amount of from 0.1 to 5% by weight, based on the weight of the building material. The pulverulent polycondensation products have a number of advantages in this context, for example excellent storage stability, good liquefying action at low dosage and technically simple production.

L~invention concerne des produits de polycondensation pulvérulents, comprenant a) de 5 à 95 % en poids d~un produit de polycondensation à base d~un composé (A) aromatique ou hétéroaromatique ayant de 5 à 10 atomes de carbone ou hétéroatomes et au moins un radical oxyéthylène ou oxypropylène et d'un aldéhyde (C) choisi parmi le formaldéhyde, l'acide glyoxylique et le benzaldéhyde ou un mélange de ces composés, ainsi que b) de 5 à 95 % en poids d~un matériau support minéral finement divisé ayant une surface spécifique comprise entre 0,5 et 500 m2/g (par BET selon DIN 66 131). Les produits de polycondensation pulvérulents selon l~invention conviennent tout particulièrement à une utilisation dans des mélanges de matériaux de construction en une quantité comprise entre 0,1 et 5 % en poids, par rapport au poids du matériau de construction. Les produits de polycondensation pulvérulents présentent toute une gamme d~avantages, tels que par exemple une excellente stabilité au stockage, une bonne action liquéfiante à faible dose, ainsi qu~une fabrication techniquement simple.

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