Dry powder mixes comprising phase change materials
AssigneeUniversity of Dayton
InventorIval O. Salyer
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Abstract
Free flowing, conformable powder-like mix of silica particles and a phase change material (p.c.m.) is disclosed. The silica particles have a critical size of about 7.times.10.sup.-3 to about 7.times.10.sup.-2 microns and the pcm must be added to the silica in an amount of 80 wt. % or less pcm per combined weight of silica and pcm. The powder-like mix can be used in tableware items, medical wraps, tree wraps, garments, quilts and blankets, and in cementitious compositions of the type in which it is beneficial to use a pcm material. The silica-pcm mix can also be admixed with soil to provide a soil warming effect and placed about a tree, flower, or shrub.
Claims7
A composition comprising, in combination, a mixture of a phase change material and finely divided silica particles, said silica particles having particle sizes of about 7.times.10.sup.-3 to about 7.times.10.sup.-2 microns, said phase change material comprising a crystalline alkyl hydrocarbon having a carbon chain length of C.sub.14 and greater and being present in an amount of 80% or less by weight and said silica particles being present in an amount of 20% or more by weight based on the total weight of phase change material and silica particles in said mixture.
Dependencies are inferred from the claim text.