| 摘要 |
PURPOSE:To provide the titled compsn. having excellent heat resistance, by blending a polyimide resin and hexamethylenetetramine with a novolak type phenolic resin. CONSTITUTION:A mixture consisting of 0.5-5pts.wt. polyimide resin and 3- 20pts.wt. hexamethylenetetramine is added to 100pts.wt. novolak type phenolic resin. The mixture is melt-kneaded by heating and crushed. EFFECT:This compsn. can be crosslinked at 160-200 deg.C and can improve hot transverse strength, said temperature range being generally the curing temp. of phenolic resins. USE:Binders for castings, brake, whetstone, etc. |
