Trimethylolpropane → Urethane acrylate

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Into a flask similar to the flask in Synthesis Example 1 were charged 44.8 parts of toluene and 4.6 parts of stearyl alcohol (NAA-46), followed by heating of the mixture to 40° C. After the confirmation of thorough dissolution of stearyl alcohol, 50 parts of xylylene diisocyanate subjected to trimethylol-propane adduct modification (“TAKENATE D-110N” a trade name of Takeda Chemical Industries, Ltd., N.V.: 75, NCO %: 11.5) were charged and the mixture was heated to 70° C. After 30 minutes of the reaction at the same temperature, 0.02 parts of dibutyltin laurate were charged. After the mixture was maintained at the same temperature for 3 hours, 91.7 parts of polycaprolactone-modified hydroxyethyl acrylate (PLACCEL FA5), 0.02 parts of dibutyltin laurate, and 0.02 parts of hydroquinone monomethyl ether were charged. The mixture was maintained at 70° C. for 3 hours to complete the reaction, and 76.5 parts of toluene were added to obtain a urethane acrylate containing 50% by weight of solid.

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