Patent ID: 6294571
Filing Date: 2001-09-25
Classification: A01N,B27K,Y10S,Y10T

Abstract:
A method of treatment for protecting and preserving lumber comprising:a) providing a lumber substrate substantially free of azadirachtin;b) treating the lumber substrate by applying a composition comprising:(i) an amount of azadirachtin sufficient to protect and preserve the lumber substrate from infestation and destruction by insects, which azadirachtin is contained in a neem plant material extract; and(ii) a lignin substance, a tannin compound or mixture thereof, the amount of which is in addition to that naturally present in the neem plant material extract and sufficient to preserve the neem plant material extract and azadirachtin contained therein from degradation;wherein the composition coats the exposed surface of the lumber substrate to be protected and a minimal portion of the composition is absorbed into the lumber substrate; andc) curing the treated lumber substrate.