Exothermic reactions
US4585843A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1984 |
| Grant date | Apr 29, 1986 |
| Priority date | — |
| Expiry date | Nov 30, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2219/00189
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An exothermic gel polymerization process conducted in the presence of water is initiated at a low temperature, is held for most of the process at a higher temperature by including in the medium a particulate heat sink material, such as sodium sulphate decahydrate, that is substantially insoluble in the medium and which undergoes an endothermic phase change and is then allowed to rise to a higher temperature. Either as a result of the endothermic change, or as a result of a subsequent exothermic change, at the end of the process the heat sink material is again solid particulate material substantially insoluble in the medium and so the product is a dispersion of the material in a polymer gel. The polymer is water soluble.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.