High molecular weight dispersants for polymer polyols
US4837246A · kind A · utility
5Cited by
3References
45Claims
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Key dates
| Filing date | May 24, 1988 |
| Grant date | Jun 6, 1989 |
| Priority date | — |
| Expiry date | May 24, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/632
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Low viscosity polymer polyol polyols having high styrene/acrylonitrile ratios and good stability may be achieved by the use of a high molecular weight (HMW) dispersant polyol comprising less than 5 wt. % of the total polyol component of the polymer polyol. The HMW dispersant should have a molecular weight higher than about 6000. Preferably, a semi-batch reactor is used, and a relatively high concentration of the HMW dispersant is initially charged to the reactor, relative to the portion of base polyol, which has a molecular weight of less than 4000.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.