PURPOSE: To obtain a laminated sheet with superior electric characteristic and small change in thickness by impregnating a non-woven fabric with a resin containing at least one of aluminum hydroxide and magnesium hydroxide and a triazine ring, and forming the fabric with heat and pressure.
CONSTITUTION: For the resin containing the triazine ring, melamine resin or benzoguanamine resin can be used. When a mixing substance of the resin and an inorganic filler is applied onto a base material of a non-woven glass fabric and dried, molded with heat and pressure, a laminated sheet is formed. The inorganic filler, for example, aluminum hydroxide or magnesium hydroxide is contained by 100-250 weight % to 100 weight % of the resin. By specifying the resin and filler, superior electric characteristic, heat-proof property, fire retardant property are obtained, particularly, the change in thickness can be restricted, and the through-hole reliability can be improved.
OGATA MASARU
YAMASHITA YUKIHIRO
| JPS592843A | 1984-01-09 |