Polyurethane grout compositions
US9527949B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 2013 |
| Grant date | Dec 27, 2016 |
| Priority date | — |
| Expiry date | Apr 23, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2190/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention typically provides one-component polyurethane grout compositions and more specially to grout composition useful for seepage control and quick stoppage of water leakage under high water pressure environment, wherein the composition comprises a isocyanate prepolymer and auxiliary components selected from a plasticizer, a silane coupling agent, a catalyst, a cell stabilizer, an anionic surfactant, a filler, a blowing agent or a mixture thereof. The invention also provides the isocyanate prepolymer composition, obtained by reacting a polyfunctional isocyanate, with a polyfunctional polyol comprising at least one polyether polyol containing relatively low amount of ethylene oxide units, and optionally other polyfunctional polyols such as polyester polyols, biorenewable polyols or a mixture thereof, and at least a monofunctional hydroxyl containing compound, wherein the NCO content of said prepolymer is 3%˜18%. The resulting grout composition can cure into a solid under water pressure from 1 MPa to 20 MPa.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.