mixture was heated to about 140 u00b0 c to distill off the toluene and the water produced by reaction of the tpa and p pda as an azeotrope at about 200 u00b0 c about 40 ml of distillate was collected the melt was allowed to cool to 120 u00b0 c when 4 9 g of a bis caprolactam adduct of 4 4 39 diisocyanatophenylmethane was added which dissolved readily at about 85 u00b0 c 7 5 ml of a 2 8 molar solution of ethylmagnesiumbromide c 2 h 5 mgbr in diethylether was injected into the melt after some initial foaming due to the evolution of ethane and ether the liquid was degassed by applying a vacuum for about five minutes the resulting bright yellow liquid was transferred into a preheated teflon coated sheet mold about 130 u00b0 150 u00b0 c the mold was closed and placed in an oven at about 160 u00b0 c for approximately one and a half hours the mold was then cooled to room temperature and the solid sheet produced in the mold was easily removed the solid sheet had a homogenous yellow appearance and had a durometer hardness of 85 d other properties of this in situ composite are listed in table i the equipment described in example 1 was used a solution of 6 6.