Adhesive with tack and use in wood composite products

A curable hybrid resin composition comprising:

• (a) water;
• (b) one or more polysaccharide or polypeptide biopolymers;
• (c) one or more monomers or oligomers having an average degree of polymerization of 4 or less;
• and,
• (d) one or more isocyanates,
• wherein a ratio of the one or more monomers or oligomers to the one or more biopolymers is in the range of about 30:70 to about 80:20 by weight,
• wherein the one or more biopolymers comprise one or more proteinaceous materials, and
• wherein the one or more proteinaceous materials contain more than 15 wt % protein but less than 40% protein on a dry basis.

A method of making a wood composite comprising a step of, applying a composition to a wood based substrate wherein the composition comprises,

• (a) water;
• (b) one or more polysaccharide or polypeptide biopolymers;
• and,
• (c) one or more monomers or oligomers having an average degree of polymerization of 4 or less,
• wherein a ratio of the one or more monomers or oligomers to the one or more biopolymers is in the range of about 30:70 to about 80:20 by weight, and
• wherein the one or more biopolymers contain more than 80 wt % starch on a dry basis,
• and wherein the one or more biopolymers comprise starch nanoparticles.

A composite material comprising

• wood;
• and,
• (i) one or more polysaccharide or polypeptide biopolymers, (ii) one or more monomers or oligomers having an average degree of polymerization of 4 or less, and (iii) one or more isocyanates, collectively having a total weight between 2% and 11% of the weight of the wood on a dry basis,
• wherein a ratio of the one or more monomers or oligomers to the one or more biopolymers is in the range of about 30:70 to about 80:20 by weight,
• wherein the one or more biopolymers contain more than 80 wt % starch on a dry basis,
• wherein the one or more biopolymers have a weight between 1% and 7% of the weight of the wood on a dry basis, and
• wherein the one or more isocyanates have a weight between 1% and 6% of the weight of the wood on a dry basis,
• and wherein the one or more biopolymers comprise starch nanoparticles.