This article will focus on the use of soybean proteins in adhesive systems. The major market opportunity is as a wood adhesive or as a binder in the manufacture of wood composites in the construction industry. Currently much attention is being paid to soybean adhesives because of its natural (non-petroleum) origins, low cost, and environmental friendliness. Many types of plants can be used to produce raw materials that can be modified for adhesive applications. These include soy, corn, castor, wood (tall), sunflower, peanut, rapeseed, palm, and other plants. Raw materials that are most prevalent in the adhesives industry are solid proteins and oils. The use of soybean derived oils as building blocks for monomers and polymers, principally polyols for urethane adhesive, has also been the subject of previous SpecialChem articles. Soybean adhesives were originally developed in 1923. However, their application has been moderated by the use of petroleum based adhesives.
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