Rigid polyurethane/polyisocyanate foams containing paraffinic based oils
US5405885A · kind A · utility
8Cited by
28References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1992 |
| Grant date | Apr 11, 1995 |
| Priority date | — |
| Expiry date | Apr 22, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/902
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The invention is a rigid polyurethane foam to which a base stock lubricating oil made of at least 55 weight percent paraffinic carbons and less than 10 weight percent aromatic carbons has been added as a hydrophobic agent protecting the polyurethane foam from reacting with environmental moisture. The foam is useful for deposit in railroad spike holes or any structural member having a cavity and where moisture within or on the cavity would otherwise react with the isocyanate to produce an uncontrollable foaming mass.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.