Polyurethane elastomers having improved green strength and demold time, and polyoxyalkylene polyols suitable for their preparation
US5965778A · kind A · utility
9Cited by
28References
8Claims
0Family size
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Key dates
| Filing date | Aug 31, 1998 |
| Grant date | Oct 12, 1999 |
| Priority date | — |
| Expiry date | Aug 31, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2410/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Elastomers exhibiting decreased demold times and improved green strength are prepared by reacting a di- or polyisocyanate with a monodisperse polyoxypropylene diol having ultra-low unsaturation, and preferably prepared by the double metal cyanide.t-butyl alcohol catalyzed polymerization of propylene oxide. Further improved demold times and elevated elastomer physical properties are made possible by the use of multidisperse polyoxyalkylene polyether polyol blends having an overall unsaturation of less than 0.010 meq/g and a polydispersity of about 1.4 or greater.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.