Thermal energy storage material comprising hydrated compound and water-swollen cross-linked polymer
US4273667A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1980 |
| Grant date | Jun 16, 1981 |
| Priority date | — |
| Expiry date | Feb 27, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K5/063
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The thermal energy storage material comprises at least one hydrated compound (such as an inorganic salt) having a reversible transition to the anhydrous or a less hydrated form and a hydrogel, comprising a water-swollen cross-linked polymer formed by cross-linking a synthetic hydrophilic polymer by a covalent cross-linking mechanism, throughout which the compound is dispersed. The hydrogel is made by reacting a water-soluble or water-dispersible synthetic hydrophilic polymer, which is preferably linear and thermoplastic, with a cross-linking agent therefor in an aqueous medium containing the hydrated compound. The hydrophilic polymer, the aqueous medium and the hydrated compound are used in such amounts that the storage material contains a major proportion, by weight, of the hydrated compound and a minor proportion, by weight, of the cross-linked polymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.