Additive for production of highly workable mortar cement
US5782972A · kind A · utility
10Cited by
16References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 21, 1997 |
| Grant date | Jul 21, 1998 |
| Priority date | — |
| Expiry date | Mar 21, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2103/52
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Mortar cement additives provide workability while retaining strength by employing a multi-stage polymer comprising a hydrophobically-modified, ionically-soluble polymer stage, the polymer being soluble at a pH of 6 and above; and an air-entraining agent. The additives also employ, as optional ingredients, set retarding agents and superplasticizers. Examplary methods of the invention involve addition of the multi-stage polymer and an air entraining agent to the mortar cement, preferably during intergrinding of Portland cement in the mill. Cement compositions comprising the polymer and an air-entraining agent are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.