PREPARATION AND PROPERTIES OF A MODEL DISPERSION OF COLLOIDAL WOOD RESIN FROM NORWAY SPRUCE

A method for the preparation of an aqueous dispersion of colloidal res in from Norway spruce was developed. The method involves extraction of freeze-dried TMP with n-hexane, removal of the n-hexane by evaporatio n and dissolution of the extract, i.e. the resin in acetone. A desired volume of the resin in acetone is then injected into water, followed by removal of the acetone by dialysis. The procedure gives a solvent-f ree dispersion containing resin droplets that closely resemble colloid al resin released from Norway spruce in mechanical pulping.