Copolymer synthesis process

US8242218B2 · kind B2 · utility

Assignee

• CONSTRUCTION RESEARCH & TECHNOLOGY GMBH · DE

Inventors

• Klaus Lorenz · Zangberg, DE
• Alexander Kraus · Evenhausen, DE
• Barbara Wimmer · Tacherting, DE
• Petra Wagner · Trostberg, DE
• Christian Scholz · Neustadt an der Weinstraße, DE
• Manfred Bichler · Trostberg, DE

Key dates

• Filing date: May 24, 2011
• Grant date: Aug 14, 2012
• Expiry date: May 24, 2031

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/915
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Preparing a non-ionic copolymer having a hydrolysable monomer residue and a polyether macromonomer residue in a semicontinuous mode in a polymerization reactor associated with a metering device, including introducing polyether macromonomer and water into the reactor, wherein hydrolysable monomer which is added thereto forms a polymerization reaction mixture; introducing hydrolysable monomer into the metering device; adding hydrolysable monomer into the reactor from the metering device; passing a free radical polymerization initiator into the reactor before and/or during the addition of the hydrolysable monomer, the hydrolysable monomer and the polyether macromonomer reacting by free radical polymerization to form the non-ionic copolymer; and, subjecting the reaction mixture to polymerization while an addition rate of the hydrolysable monomer and/or at least a component of the polymerization initiator is varied stepwise or continuously. No monomer is introduced to incorporate ionic cement binding sites into the non-ionic copolymer.