Fluidifying agents for cementitious compositions based random copolymers, compositions comprising the same, and methods for their use

US5668195A · kind A · utility

Assignee

• MBT Holding AG · CH

Inventor

• Bernhard Leikauf · Linn, CH

Key dates

• Filing date: Jul 26, 1996
• Grant date: Sep 16, 1997
• Expiry date: Jul 26, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2103/30
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A random copolymer corresponding to Formula I in free acid or salt form having the following types and numbers of monomer units; ##STR1## wherein A is selected from the moities (i) and (ii); EQU --CR.sub.1 R.sub.2 --CR.sub.3 R.sub.4 -- (i) wherein R.sub.1 and R.sub.3 are selected from substituted benzene, C.sub.1-8 alkyl, C.sub.2-8 alkenyl, C.sub.2-8 alkylcarbonyl, C.sub.1-8 alkoxy, carboxyl and hydrogen, or R.sub.1 and R.sub.3 can together with R.sub.2 and/or R.sub.4 form a ring; and R.sub.2 and R.sub.4 are selected from hydrogen and C.sub.1-4 alkyl; and ##STR2## wherein R.sub.1 and R.sub.3 are as for (i) and R.sub.7, R.sub.8, R.sub.9 and R.sub.10 are individually selected from hydrogen and C.sub.1-6 alkyl, or R.sub.1 and R.sub.3 together with R.sub.7 and/or R.sub.8, R.sub.9 and R.sub.10 form a continuous C.sub.2-8 hydrocarbon chain joining the carbon atoms to which they are attached, the hydrocarbon chain optionally comprising at least one hetero atom and the ring optionally having at least one anionic group, preferably sulphonic; PA1 M is selected from hydrogen and the residue of a hydrophobic polyalkylene glycol or a polysiloxane, with the proviso that when A is (ii) and M is t…