| abstract |
The invention provides a process for forming a laminate, which process comprises the steps of: A. REACTING A SYTRENE WITH A PHENOL IN THE PRESENCE OF AN IONIC CATALYST TO PREPARE A STYRENATED PHENOL, B. WATER WASHING THE STYRENATED PHENOL C. MIXING THE WASHED STYRENATED PHENOL WITH A PHENOL SELECTED FROM THE GROUP CONSISTING OF PHENOL, CRESOL AND XYLENOL, AND AN ALDEHYDE, THE WEIGHT RATIO OF PHENOL TO STYRENATED PHENOL IN THE MIXTURE BEING 95:5 TO 30:70 D. CONDENSING THE MIXTURE IN THE PRESENCE OF A VOLATILE ALKALINE CONDENSATION CATALYST E. IMPREGNATING FIBROUS SHEETS WITH THE RESIN PRODUCT THUS OBTAINED, DRYING THE IMPREGNATED SHEETS, ASSEMBLING A PLURALITY OF THE DRIED SHEETS AND HEATING THE ASSEMBLED SHEETS UNDER PRESSURE TO FORM THE DESIRED LAMINATE. The laminates so produced have good electrical properties. |