Patent ID: 6136217
Filing Date: 2000-10-24
Classification: A23L,A61F,C09K

Abstract:
A phase change material comprising a composition for storing and restoring thermal energy by latent heat, consisting essentially of a single phase of a molecular alloy, consisting essentially of at least one compound represented by the formula (I) whereinA and Z are different, and each represents a saturated or unsaturated, optionally substituted acrylic organic compound having from 2 to 120 carbon atoms, having the latent heat exhibited by a phase-change material, having a degree of molecular homeomorphism .sub.68 k greater than 0.8, wherein when more than one compound of the formula (I) is present at least a pair of compounds exhibits a combined degree of molecular homeomorphism .sub..epsilon.k greater than 0.8, and wherein the inter-molecular interactions between A and Z are relatively comparable,x.sub.a and x.sub.z denote the molar proportions of A and Z respectively,wherein said composition hasthe capacity of storing or restoring thermal energy at a temperature T over a temperature range .delta. not exceeding 8.degree. C.belongs to a phase diagram having, if the alloy is binary, a loop in the case of total miscibility, or a partial loop in the case of partial miscibility, or, if the alloy is ternary or above, a transition zone, said loop or zone lying in a temperature band including that which is required for a given application and whose geometric locus EGC (equal to the G curve) is slightly curved and close to horizontal, to ensure a .delta. not exceeding the required width, anda behavior satisfactory for thermal cycling; in the form of a packaging.