| abstract |
A polymerizable liquid useful for the production of a three-dimensional object comprised of polyurethane, polyurea, or a copolymer thereof by additive manufacturing, is described. The polymerizable liquid comprises a mixture of: (a) at least one constitutent selected from the group consisting of (i) a blocked or reactive blocked prepolymer, (ii) a blocked or reactive blocked diisocyanate, and (iii) a blocked or reactive blocked diisocyanate chain extender, (b) optionally at least one additional chain extender, (c) a photoinitiator, (d) optionally a polyol and/or a polyamine, (e) optionally a reactive diluent, (f) optionally at least one non-reactive light absorbing pigment or dye which when present is included in an amount of from 0.001 or 0.01 to 10 percent by weight, and (g) optionally a filler (e.g. silica). |