Water-soluble, biologically degradable copolymers based on...

C - Chemistry – Metallurgy – 08 – G

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C08G 69/48 (2006.01) C04B 24/28 (2006.01) C08H 1/00 (2006.01)

Patent

CA 2507784

Water-soluble, biologically degradable copolymers based on polyamide are described which contain at least one grafted side chain composed of aldehydes and sulfur-containing acids and salts thereof and optionally at least one compound from the series ketones, aromatic alcohols, urea (derivatives) and amino-s- triazines. Natural polyamides such as caseins, gelatins, collagens, bone glues, blood albumins and soya proteins as well as degradation products thereof and synthetic polyamides such as polyaspartic acids and copolymers of aspartic and glutamic acid are used as preferred polyamide components. These copolymers are obtained primarily by graft polymerization at temperatures between -10 and 250° C, preferably in the presence of a solvent such as water or by thermal drying and they are used in particular as flow agents or water retention agents for inorganic binders and pigments especially in combination with hydraulic binders they only have a very slight setting-retardant effect.

L'invention concerne des copolymères hydrosolubles biodégradables à base de polyamides comprenant au moins une chaîne latérale greffée constituée d'aldéhydes et d'acides sulfureux et de leurs sels et éventuellement d'au moins un des composés suivants : cétones, alcools aromatiques, (dérivés d')urée et amino-s-triazines. Les composants de type polyamides utilisés de préférence sont des polyamides naturels tels que des caséines, gélatines, collagènes, colles d'os, albumines sanguines et protéines de soja ou leurs produits de dégradation, ainsi que des polyamides synthétiques tels que des polyacides asparagiques ou des copolymères d'acide aspartique et d'acide glutamique. Les copolymères selon l'invention sont surtout produits par polymérisation greffante à des températures comprises entre -10 et 250 ·C, de préférence en présence d'un solvant tel que de l'eau, mais aussi par séchage thermique, et sont en particulier utilisés en tant que dissolvants ou agents de rétention d'eau pour liants inorganiques et pigments. Selon l'invention, ces copolymères sont surtout caractérisés en ce qu'ils ne retardent la prise que très légèrement lorsqu'ils sont associés à des liants hydrauliques.

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