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To a reactor are charged 66 parts of paraformaldehyde, 66 parts of methanol and 1 part of potassium hydroxide. The mixture is warmed and stirred until the paraform dissolves. While the temperature is maintained in the 25°-35° C. range, 93 parts of aniline are added to the paraform solution. Upon completion of the aniline addition the reaction is stirred for 15 minutes and then 114 parts of bisphenol A are added. The reaction is heated to atmospheric reflux and refluxed for 1 hour. After 1 hour, toluene (100 parts) is added to the reaction mixture while it is being cooled. A water layer forms which is removed. The toluene is removed by heating and applying reduced pressure until a temperature of 90° C. at 7 kPa pressure is reached. The appropriate solvent is added at this point. The devolitilized resin has a % closed dihydrobenzoxazine ring of 87%, and a calculated equivalent weight of 262.

1. temperatureThe mixture is warmed
2. dissolutiondissolves
3. additionare added to the paraform solution
4. stirringis stirred for 15 minutes
5. temperatureThe reaction is heated
6. temperatureto atmospheric reflux
7. temperaturerefluxed for 1 hour
8. temperatureis being cooled
9. customA water layer forms which is removed
10. customThe toluene is removed
11. temperatureby heating
12. customuntil a temperature of 90° C.
13. additionThe appropriate solvent is added at this point
14. customclosed dihydrobenzoxazine ring of 87%