Patent ID: 7582226

Claim:
A fluid composition comprising: (a) a compound of formula I: wherein R 1 is linear C 4 alkyl, and R 2 is C 1 –C 4 alkyl; and (b) a compound of formula II: wherein R 1 is branched C 4 alkyl, and R 2 is C 1 –C 4 alkyl; and R 1 of formula I and R 1 of formula II have an equal number of carbons, with formula I and formula II being present at a weight ratio of 3.5-100:1; and (c) a compound of formula III: wherein R 1 is C 4 alkyl, R 2 is C 1 –C 4 alkyl, and R 3 is C 1 –C 4 alkyl wherein the composition has: a) an initial boiling point of at least about 60° C., b) a flash point of at least 3° C., c) no more than 2.0 wt % halogen, d) a water content of less than or equal to about 1.0 wt. % e) a total acid content of less than or equal to 0.1 wt. %, and f) an evaporation rate of 0.1 to 12 relative to that of n-butyl acetate.