Polyurethane geotextile composite liner with improved water resistance and a process for the production thereof
US6669407B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 2001 |
| Grant date | Dec 30, 2003 |
| Priority date | — |
| Expiry date | Mar 15, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2190/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A water-resistant polyurethane geotextile composite suitable for use as a liner is made by impregnating a geotextile with a water-resistant polyurethane and allowing the polyurethane impregnated in the geotextile to cure. The water-resistant polyurethane composition is a reaction product of (a) a liquid polyisocyanate having an isocyanate content of at least 10% by weight, (b) an isocyanate-reactive component which includes (1) 20-90% by weight castor oil having a water content of less than 0.5% by weight, and (2) a polyether polyol in which at least 70% by weight of the alkylene oxide is propylene oxide, and (c) a urethane catalyst. Low molecular weight diols and triols and fillers may optionally be included.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.