Thermoplastic elastomer compounds exhibiting high latent heat of fusion in solid state

摘要

A thermoplastic elastomer compound is disclosed having a high latent heat of fusion, indicative of a large thermal capacity. Use of thermal capacity agents, particularly linear paraffin waxes used in replacement of conventional plasticizer oils, contributes the thermal capacity advantages. Selection of the particular thermal capacity agent can provide an ability to engineer the amount of thermal capacity and the transition temperature in which that thermal capacity can be utilized as absorption or release of heat. The compound experiences a solid-solid phase transition whenever the thermal capacity agent melts into liquid form in the compound.

主权项

1. A thermoplastic elastomer compound, comprising:
(a) at least one thermoplastic elastomer, wherein the thermoplastic elastomer is a styrenic block copolymer, (b) at least one thermal capacity agent selected from the group consisting of low oil content linear paraffin waxes, C14-C16 linear paraffin waxes, single cut linear paraffin waxes, and combinations thereof, and directly dispersed in the compound from about 5 to about 70 weight percent of the compound, (c) plasticizer from 0 to about 45 weight percent of the compound, and (d) one or more additives from 0 to about 10 weight percent of the compound, wherein the one or more additives are selected from the group consisting of adhesion promoters; biocides; anti-fogging agents; anti-oxidants; anti-static agents; blowing agents; dispersants; extenders; fillers; flame retardants; foaming agents; smoke suppressants; impact modifiers; initiators; lubricants; micas; pigments; colorants; dyes; processing aids; release agents; silanes; titanates; zirconates; slip agents; anti-blocking agents; stabilizers; stearates; ultraviolet light absorbers; viscosity regulators; waxes; and combinations of them, wherein the compound has an enthalpy of melting ranging from about 10 to about 120 J/g and an enthalpy of crystallization ranging from about 10 to about 125 J/g, and wherein the compound experiences a solid-solid phase transition whenever the thermal capacity agent melts into liquid form in the compound.