WATER-SOLUBLE POLYMER OF ESTER MADE FROM ACRYLIC ACID AND ALKYLPOLYALKYLENE GLYCOL

• Main Authors: BRODT GREGOR, BUCHNER KARL-HEINZ, KRONER MATTHIAS
• Format: Patent
• Language: English
• Published: 03.04.2003
• Edition: 7
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; LIME, MAGNESIA; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; REFRACTORIES; SLAG; THEIR PREPARATION OR CHEMICAL WORKING-UP; TREATMENT OF NATURAL STONE

PROBLEM TO BE SOLVED: To provide a water-soluble polymer useful as an additive to cementitious compositions. SOLUTION: The water-soluble polymer is a water-soluble polymer of an ester made from acrylic acid and an alkylpolyalkylene glycol which can be obtained by azeotropic esterification of a mixture of acrylic acid and the alkylpolyalkylene glycol (in a molar ratio of 2 to 3:1) in the presence of at least 85 mass%, based on the alkylpolyalkylene glycol, of an organic solvent which forms an azeotrope with water, followed by free-radical polymerization, in an aqueous medium, of the mixture obtained during the esterification while azeotropically distilling off the organic solvent from the reaction mixture during this polymerization and returning the water removed by distillation to the reaction mixture or replacing the water by a feed of fresh water.