| 摘要 |
PURPOSE:To improve the moisture resistance, electrical insulating property, punchability and productivity of a laminated board, by using a small amount of a phenolic resin precondensate containing a small amount of a diamine or triamine as a resin for treating a base material in producing the laminated board of the phenolic resin on paper base material. CONSTITUTION:A triamine, e.g. ethylenediamine, or triamine, e.g. diethylene triamine, in an amount of 0.1-1wt% based on the resin solid is added to a phenolic resin precondensate, and the resultant mixture is used as a resin for treating a base material (primer resin) to treat a paper base material, which is then impregnated with a facing phenolic resin to give prepreg. Sheets of the resultant prepreg in a given number are laminated and hot-pressed to afford the amined laminated board.
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