Moisture resistant polyurethanes derived from non-aromatic diisocyanates
US4631329A · kind A · utility
31Cited by
3References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 29, 1985 |
| Grant date | Dec 23, 1986 |
| Priority date | — |
| Expiry date | Nov 29, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/6505
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The reduction in tensile strength exhibited in high humidity environments by "soft" polyurethanes prepared from aliphatic or cycloaliphatic diisocyanates can be substantially reduced if the molar ratio of diisocyanate and chain extender to isocyanate-reactive species other than said chain extender in the reaction mixtures from which said polyurethanes are prepared is at least 4.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.