Patent ID: 6884285

Claim:
A wood treatment concentrate includes, by weight; (a) 0.1-10% of an active wood treatment chemical, (b) 50-99% of a microemulsion concentrate including: (i) 0.03-80% of a castor oil ethoxylate or tristyryl phenol ethoxylate, (ii) 0-10% of an ethoxylated phosphoric acid as pH buffer, (iii) 0.002-40% of a N—C 8 -C 18 alkyl pyrrolidone and (iv) 0-60% of a N—C 1 -C 4 alkyl pyrrolidone, and (v) 0-30% of an ethylene oxide/propylene oxide block copolymer, and (c) 1-50% of a substituted phenol.