Novel thickeners for oil-containing compositions are crystalline polymers, preferably side chain crystalline polymers, which (a) have a crystalline melting point, T.sub.p, and an onset of melting temperature, T.sub.o, such that T.sub.p-T.sub.o is less than T.sub.p.sup.0.7; (b) are soluble in the oil at temperatures above T.sub.p, and (c) have been dispersed in the oil by a process which comprises (i)dissolving the polymer in the oil at a temperature above T.sub.p, and (ii) cooling the solution from step (i) to crystallize the polymer in the oil.

 
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