Process for sealing and/or priming concrete with aqueous polyisocyanate dispersions and the concrete obtained by this process
US5236994A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 1991 |
| Grant date | Aug 17, 1993 |
| Priority date | — |
| Expiry date | Mar 28, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31598
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention is directed to a process for sealing and/or priming concrete by applying to concrete an aqueous polyisocyanate dispersion which has an isocyanate content of at least 0.5% by weight, based on the weight of the polyisocyanate, and is prepared by PA1 a) dispersing in water a polyisocyanate which has an isocyanate content of at least 12% by weight and PA1 b) optionally reacting the dispersed polyisocyanate with PA2 i) a primary or secondary monoamine containing at least one hydroxyl group in an amount sufficient to provide an equivalent ratio of amino groups to isocyanate groups of 0:1.0 to 0.7:1.0 and/or PA2 ii) a polyamine having primary and/or secondary amino groups and a molecular weight of 400 or less in an amount sufficient to provide an equivalent ratio of amino groups to isocyanate groups of 0:1.0 to 0.4:1.0, provided that when components i) and ii) are both reacted with the dispersed polyisocyanate, component i) is mixed with the dispersed polyisocyanate either before or during the mixing of component ii) and the equivalent ratio of amino groups from both components i) and ii) does not exceed 0.95:1.0. The present invention is also directed to the primed …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.