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