Patent ID: 7449130

Claim:
A lignocellulosic-based composite having resistance against insect and fungal attack which comprises a pesticidal amount of a borate preservative comprising a higher solubility borate and a lower solubility borate, wherein said higher solubility borate is selected from the group consisting of boric acid, boric oxide, ammonium borate, alkali metal borate, calcium borate, calcium magnesium borate, magnesium borate and calcium sodium borate, and the lower solubility borate is selected from the group consisting of cooper borate, zinc borate and barium metaborate, and wherein the higher solubility and lower solubility borates combined have a mean particle size of between about 500 microns and about 1 micron, and wherein the composite comprises multiple layers and the higher solubility borate and lower solubility borate are incorporated into different layers.