Cement additives
US5614017A · kind A · utility
57Cited by
23References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 26, 1996 |
| Grant date | Mar 25, 1997 |
| Priority date | — |
| Expiry date | Mar 26, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2103/32
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Substances useful as water reducing and superplasticizer additives for cement compositions are formed by reaction of carboxylic acid polymers with polyethers of C.sub.2 -C.sub.4 epoxides wherein partial cleavage of the polyether and esterification of the polyether and the cleavage products thereof by the other reactant are achieved. In one embodiment, a sulfonic acid is used to catalyze the reaction of poly(acrylic acid) and a monofunctional ethylene oxide-propylene oxide copolymer at a temperature in excess of 140.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.