Concrete hardening retarder
US6730764B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1999 |
| Grant date | May 4, 2004 |
| Priority date | — |
| Expiry date | Dec 15, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A concrete retarder comprises a polymer (A) having the concrete set retarding ability. The polymer (A) has, as a structural unit, a low glass transition temperature (Tg) component with a Tg of not higher than −5° C., and a surface tension of 45 mN/m or lower. The proportion of the low Tg component having a glass transition temperature (Tg) of not higher than −5° C. is 10% by weight or more relative to the whole polymer (A). The polymer (A) has a functional group which can form a salt with a metal ion (particularly, a free acid group or a group capable of forming an acid group by hydrolysis). The polymer (A) is a vinyl-series polymer, a polyester (saturated or unsaturated polyester), or a crosslinked or graft polymerized unsaturated polyester. A sheet and a decorative pack may be formed with the concrete retarder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.