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US 4,461,721 AGranted
Wood preservative
AssigneeBASF SE
InventorsReimer Goettsche, Hans-Norbert Marx
Life of this patent
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Abstract
A wood preservative based on an aqueous mixture of boric acid and a water-soluble organic amine, which mixture additionally contains sodium polyborate or a mixture of boric acid and borax.
Claims10
A wood preservative comprising an aqueous composition which consists essentially of:
- (a) from 20 to 60 parts by weight of a salt forming composite consisting of boric acid and a water-soluble organic amine, and
- (b) from 40 to 80 parts by weight of sodium polyborate or a mixture of boric acid and borax in a weight ratio of from 2:1 to 1:1.2 leaving out of account the boric acid present as the salt of the organic amine, and wherein said 40 to 80 parts by weight is determined by leaving out of account the presence of water and the boric acid present as the salt of the organic amine.
A process for preparing a wood preservative which comprises:
- (a) producing an amine salt forming concentrate by stirring boric acid into a water-soluble organic amine;
- (b) adding sodium polyborate or boric acid and borax in a weight ratio of 2:1 to 1:1.2 to said concentrate while stirring to form an admixture thereof;
- and
- (c) adding water to said admixture in the amount required to obtain the viscosity desired in the resulting wood preservative product.
1 more element
Dependencies are inferred from the claim text.