| 摘要 |
PURPOSE:To obtain the titled molded item whose surfaces are tough and hard, and that is dense and excellent in heat resistance, wear proofness, dimensional stability, etc., by mixing a woody material such as wood flour or the like with a special compound containing acid anhydride groups, and molding the mixture under heat and pressure. CONSTITUTION:Trimellitic acid ester anhydride of formula I (wherein R1 represents a glycol residue) or pyromellitic acid ester anhydride (A) having more than one acid anhydride group of formula II [wherein R2 represents a (poly)alkylene glycol residue, or a polyhydric alcohol residue having 3 or 4 OH groups, and (n) is 1-3] is added to a woody material (B) comprising wood flour, wood chips or wood fibre, and they are intimately stirred. Then the mixture is molded under heat and pressure to obtain the intended item. It is preferable to mix the constituents (A) and (B) at or over the softening or melting point of the constituent (A). EFFECT:According to the composition of the mixture, the obtained item has a glossy plastic appearance. |
