DETAILED DESCRIPTION OF THE INVENTION The tartarimides of the present invention are prepared by the reaction of tartaric acid and one or more primary amines, having the formula RNH.
sub.
2 wherein R represents a hydrocarbon-based radical of about 5 to about 150 carbon atoms, or R'OR" in which R' is a divalent alkylene radical of 2 to 6 carbon atoms, R" is a hydrocarbyl radical of about 5 to about 150 carbon atoms, or R.
The hydrocarbon-based radicals of the present invention denote a radical having a carbon atom directly attached to the remainder of the molecule and having predominantly hydrocarbon character within the context of this invention.
Such radicals include: (1) hydrocarbyl radicals; that is aliphatic, (e.
g.
, alkyl or alkenyl), alicyclic (e.
g.
, cycloalkyl or cycloalkenyl), aromatic, aliphatic- and alicyclic-substituted aromatic, aromatic-substituted aliphatic and alicyclic radicals, and the like, as well as cyclic radicals wherein the ring is completed through another portion of the molecule (that is, any two indicated substituents may together form an alicyclic radical).
The hydrocarbyl radical is preferably aliphatic; e.
g.
, alkyl or alkenyl of 5 or more carbon atoms.
Examples include such monovalent alkyl radicals as pentyl, hexyl (caprylyl); capryl, lauryl, dodecyl, myristyl, pentadecyl, palmityl, margaryl, stearyl, and behenyl.
Other alkenyl radicals include dodecenyl, myristoleyl, palmitoleyl, oleyl and linoleyl.
(2) Substituted hydrocarbon radicals, that is, radicals containing non-reactive or substantially non-hydrocarbon substituents which, in the context of this invention, do not alter the predominantly hydrocarbon character of the radical.
Representative non-reactive or substantially non-reactive non-hydrocarbon or polar substituents which can be present as a substituent include halo substituents such as chloro, fluoro, bromo, and iodo; nitro; lower alkoxy such as butoxy and hexyloxy; lower alkylthio, such as methyl thio, pentyl thio and heptylthio.
The substitution of and the nature of the substituent on the hydrocarbon-based radical is such that the essentially hydrocarbon character of the radical is not destroyed
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Heat Accumulators 
