Patent ID: 8333903

Claim:
A process for preparing a flexible phase change material (PCM) composition having an amorphous polymer matrix comprising: a) from 50 to 70 wt % of one or more alkyl hydrocarbons; and b) from 30 to 50 wt % of at least one amorphous ethylene propylene rubber having a density equal to or lower than 0.900 g/cm 3 ; the weight percentages of said alkyl hydrocarbons and said at least one ethylene propylene rubber being based on the total weight of the PCM composition, the process comprising the step of blending said one or more alkyl hydrocarbons and said at least one amorphous ethylene propylene rubber at a temperature above the melting point of the alkyl hydrocarbon and below 30° C. for a time sufficient to incorporate the total amount of the one or more alkyl hydrocarbons within the polymer matrix.