Glycerol → Urethane acrylate

Participants

Reaction Conditions

Reaction Steps

A vinyl terminated, fully reacted urethane acrylate was prepared from the glycerine-modified hydroxyalkylated novolac of Example 16 in the following manner: A mixture of 1155 parts of styrene solvent, 415 parts of hydroxypropyl methacrylate, and 0.4 parts of p-benzoquinone was stirred while 519 parts of toluene diisocyanate (a mixture of approximately 80 percent 2,4-isomer and 20 percent 2,6-isomer) was added slowly so that the temperature did not exceed 45° C. The temperature was then raised to 55° C and maintained thereat for about 30 minutes. Then 510 parts of glycerine-modified hydroxypropylated novolac, prepared as in Example 16 was added and the reaction mixture was heated to 65° C an maintained at that temperature for about 4 hours. The liquid resin, thus prepared had a Brookfield viscosity of 120 centipoises at 25° C.

Provenance & Evidence