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Abstract

The present invention relates to an adhesive composition for manufacturing glued laminated beams and wood constructions. One component of the adhesive composition is resorcinol-phenol resin. Resorcinol-phenol adhesives are as such known in the prior art. The main ingredients of these adhesives are resorcinol, formaldehyde and phenol. Among the drawbacks in the use and production of resorcinol-phenol adhesives are their high price and the fact that the raw materials are difficult to obtain. The purpose for employing the adhesive composition of the invention is to eliminate some of the difficulties connected with the availability of the raw materials, particularly resorcinol, and to help produce a new, more economical resorcinol-phenol based adhesive composition. Part of the resorcinol-phenol resin used in the adhesive composition is replaced by a humus substance extract made of peat, preferably decomposed peat, or by a commixture made of humus substance extract and formaldehyde, providing an adhesive composition according to the invention which contains 40-90% by weight resorcinol-phenol resin, the dry matter content whereof is 30-60% by weight and 10-60% by weight humus substance extract made from peat. Into this adhesive composition there is added, before use, some generally known hardener such as formaldehyde at 5-20% by weight. Into the humus substance extract of the adhesive composition may be added 10-20% by weight formaldehyde.

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First Claim