| 摘要 |
PURPOSE:To obtain a laminate with high flame-retardancy, improved in punching processability at normal temperature, by forming prepregs prepared by impregnating sheet substrates with a specific phosphazene compound-incorporated resin varnish. CONSTITUTION:The objective laminate can be obtained by hot pressing of a plural of prepregs, which can be prepared by impregnating sheet substrates such as of paper or cloth with a solution made by dissolving a phosphazene compound of formula (R<1> is amino, hydroxymethylamino, or aryloxy; R<2> is halogen, alkoxy or aryloxy) in a phenolic resin varnish. The amount of said phosphazene compound to be added to the varnish is such as to be 1-15 PHR based on the varnish. |
