Method for the preparation of graft polymer dispersions having broad particle size distribution without wildly fluctuating viscosities
US5223570A · kind A · utility
16Cited by
9References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1991 |
| Grant date | Jun 29, 1993 |
| Priority date | — |
| Expiry date | Apr 1, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2101/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for preparing graft polymer dispersions having broad particle size distribution without wildly fluctuating viscosities is disclosed. The method comprises: PA0 (a) preparing intermediate graft polyol dispersions containing 30 percent by weight or less solids to achieve a broad distribution of partial sizes in a continuous process and PA0 (b) charging the intermediate graft polymer dispersion of (a) to a semi-batch reactor as seeds for further grafting to increase the solids content of the dispersion to above 30 percent by weight. The graft polymer so formed is useful in the production of polyurethanes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.