Polycondensation of epihalohydrin and polyhydric alcohols and thermal condensation to form polyethercyclicpolyols
US5198532A · kind A · utility
14Cited by
9References
31Claims
0Family size
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Key dates
| Filing date | Apr 14, 1992 |
| Grant date | Mar 30, 1993 |
| Priority date | — |
| Expiry date | Apr 14, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/22
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyethercyclicpolyols are prepared by thermally condensing a polyol having at least three hydroxyl groups of which at least two of the hydroxyl groups are vicinal, precursors of the polyol, cyclic derivatives of the polyol, or mixtures thereof, and controlling process conditions to avoid substantial undesirable degeneration. Lower molecular weight polyethercyclicpolyols are polycondensed with epihalohydrins to form higher molecular weight polyethercyclicpolyols.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.