Cement retarder and cement retardative sheet
US6376580B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1999 |
| Grant date | Apr 23, 2002 |
| Priority date | — |
| Expiry date | Apr 12, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/8305
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A polymer comprising an anionic group (e.g. an acid anhydride group, a carboxyl group) and a hydrophilic segment (e.g. a polyoxyalkylene ether unit) is used as a cement retarder. The polymer is obtainable by copolymerization of a monomer including maleic anhydride with a monomer including a vinylalkyl ether-series monomer in which an alkylene oxide is added to allyl alcohol. The polymer may be a copolymer copolymerized with other monomers such as styrene. Use of this cement retarder can provide patterns or washing-finished face on the surface of a concrete product. The cement retarder is suitable for application for a cement retardative sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.