POLYMERIC PRESS-COMPOSITION Russian patent published in 1994 - IPC

FIELD: polymeric materials. SUBSTANCE: press-composition has, wt.-%: thermal-reactive binder 5-9; dye 1-5; wood fiber - product of treatment of wood chip with acetic acid at the polymerization degree 1700-1800, hydroxyl-group content is 26.3%, and wood saw-dust - the rest. Samples hardened at 140-150 C, under pressure 30 MPa, at thickness 1 min/mm show the following properties: density is 1280 kg/m³, strength limit: at the static bending is 64.3-82 MPa, hardness is 130.7-139 MPa, specific viscosity is 6-6.7 J/m²·10³, water absorption is 0.75-1.6%, swelling is 0.6-0.64%, content of free formaldehyde is 6-18.6 mg/100 g. EFFECT: enhanced quality of composition. 1 tbl