| 摘要 |
PROBLEM TO BE SOLVED: To provide a phenolic resin molding material having an excellent mechanical strength at heating and having only a small amt. of burrs. SOLUTION: This phenolic resin molding material comprises, as indispensable components, (a) a high mol.wt. novolak type phenolic resin having a wt. average mol.wt. of >50,000 based on a polystyrene as a control material, (b) hexamethylenetetramine as a curing agent and (c) an org. filler and/or inorg. filler. Based on the whole molding material, it pref. comprises (a) 30-60 wt.% of a high mol.wt. novolak type phenolic resin having a wt. average mol.wt. of >=50,000 based on a polystyrene as a control material, (b) 3-18 wt.% of hexamethylenetetramine as a curing agent and (c) 40-60 wt.% of an org. filler such as wood powder and/or an inorg. filler such as calcium carbonate.
|
