Polymers for cement dispersing admixtures
US6855752B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 2001 |
| Grant date | Feb 15, 2005 |
| Priority date | — |
| Expiry date | Nov 17, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2103/308
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Polymers for cement dispersing admixtures, which show different performing properties in concrete are described. All polymers are based on a composition of reactants, namelya) a poly(acrylic acid), b) a polyalkyleneglycol-monoalkylether and, optionally c) a α-amino-polyalkylene-glycol-ω-alkylether and/or d) a primary or secondary amine. By keeping the composition of reactants constant and varying only the reaction time, polymers with different properties can easily be achieved. Such polymers are suitable for pre-cast, readymix or for increasing workability over time, just depending on reaction time. Polymers of the invention can be used as single polymer or in polymer blends. For this, the kinetics of the used polymer analogous condensation reaction was intensively studied. Additionally, the benefit of amines as reactant regarding stability and hydrolysis velocity of cleavable side groups was investigated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.