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Abstract

A water-soluble chromium-free wood preservative comprising at least one copper salt and an alkanolamine and a polymeric quaternary ammonium borate formed by simultaneous reaction of (A) an amine selected from the group consisting of ##STR1## wherein R.sub.1 is alkyl or alkenyl of 8 to 22 carbon atoms or when R.sub.2 and R.sub.3 are --(C.sub.2 H.sub.4 O).sub.x --H or --(C.sub.3 H.sub.6 O).sub.x --H, R.sub.1 is alkyl of 1 to 22 carbon atoms, R.sub.2 is selected from the group consisting of hydrogen, alkyl of 1 to 22 carbon atoms, --(C.sub.2 H.sub.4 O).sub.x --H, --(C.sub.3 H.sub.6 O).sub.x --H and --CH.sub.2 --CH.sub.2 --NH.sub.2, R.sub.3 is selected from the group consisting of hydrogen, --(C.sub.2 H.sub.4 O).sub.x --H, --(C.sub.3 H.sub.6 O).sub.x --H and CH.sub.2 --CH.sub.2 --CH.sub.2 NH.sub.2, R.sub.4 and R.sub.6 are individually alkyl of 1 to 4 carbon atoms or --(CH.sub.2 H.sub.4 O).sub.x --H or --(C.sub.3 H.sub.6 O).sub.x --H, R.sub.5 and R.sub.2 are individually --(C.sub.2 H.sub.4 O).sub.x --H or -- (.sub.3 H.sub.6 O).sub.x --H, A is selected from the group consisting of --(CH.sub.2).sub.n --, --(CH.sub.2 --CH.sub.2 OCH.sub.2).sub.n -- and --(CH.sub.2 CH.sub.2 NHCH.sub.2 CH.sub.2).sub.n --, x is an integer of 1 to 55 and n is an integer of 1 to 20, (B) 2 to 20 moles of ethylene oxide or propylene oxide and (C) 0.6 to 1.5 moles of a member of the group consisting of boric acid, boric acid salts and boric acid esters per mole of nitrogen equivalent of (A) useful for impregnating wood exposed to weather conditions or installed in contact with soil.

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