초록 ▼

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

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.

대표청구항 ▼

In a thermal energy storage material which comprises at least one hydrated compound which has a reversible transition to the anhydrous or a less hydrated form and a minor amount of hydrogel throughout which said compound is dispersed, the improvement comprising that the hydrogel comprises a water-sw

In a thermal energy storage material which comprises at least one hydrated compound which has a reversible transition to the anhydrous or a less hydrated form and a minor amount of hydrogel throughout which said compound is dispersed, the improvement comprising that the hydrogel comprises a water-swollen cross-linked polymer formed by cross-linking a synthetic hydrophilic polymer by a covalent cross-linking mechanism.