Patent ID: 7608181

Claim:
A distillate fuel blend with improved seal swell properties comprising: a) at least one highly paraffinic distillate fuel component having a branching index of less than about 5, and a volume increase of less than about 0.2% when measured according to ASTM D 471 at 23+/−2° C. and for 70 hours when using a nitrile O-ring seal; and b) about 5 wt % to about 20 wt % of at least one component selected from the group consisting of alkylaromatics, alkylcycloparaffins and combinations thereof, wherein the blend exhibits a volume increase of more than about 0.2% when measured according to ASTM D 471 at 23+/−2° C. and for 70 hours when using a nitrile O-ring seal.