| 摘要 |
PURPOSE:To obtain the titled laminated excellent in low-temperature punchability, electrical properties, etc., and low in warpage and twist, by laminating and molding prepregs formed by impregnating paper bases containing an inorganic filler and a silane coupling agent with a specified phenolic resin varnish. CONSTITUTION:Paper bases containing an inorganic filler and a silane coupling agent are impregnated with a phenolic varnish formed by mixing a phenolic resin with 5-50wt% inorganic filler and 0.5-2wt%, based on the inorganic filler, silane coupling agent and dried to obtain prepregs. These prepregs are laminated and molded. The paper base must contain the silane coupling agent because this improves adhesion among the paper base, the filler, and the phenolic resin. The silane coupling agent is added to the phenolic resin because this improves the affinity of the resin for the filler and allows smooth mixing of both. |
