20-09-2018 дата публикации
Номер: US20180265738A1
Принадлежит:
A polymerizable liquid, or resin, useful for the production by additive manufacturing of a three-dimensional object of polyurethane, polyurea, or a copolymer thereof, is described. The resin includes at least one of (i) a blocked or reactive blocked prepolymer, (ii) a blocked or reactive blocked diisocyanate, or (iii) a blocked or reactive blocked diisocyanate chain extender. 2. The polymerizable liquid of claim 1 , comprising a mixture of:(a) a blocked or reactive blocked prepolymer,(b) a chain extender,(c) a photoinitiator,(d) optionally a polyol and/or a polyamine,(e) optionally a reactive diluent,(f) a light absorbing pigment or dye in an amount of from 0.001 to 10 percent by weight, and(g) optionally a filler.3. The polymerizable liquid of claim 2 , wherein said pigment or dye is:(i) titanium dioxide,(ii) carbon black, and/or(iii) an organic ultraviolet light absorber.5. The liquid of claim 2 , wherein said blocked or reactive blocked prepolymer comprises a polyisocyanate;and/or said reactive blocked prepolymer comprises two or more ethylenically unsaturated end groups.6. The liquid of claim 2 , wherein said blocked or reactive blocked prepolymer comprises a polyisocyanate oligomer produced by the reaction of at least one polyisocyanate with at least one polyol or polyamine.7. The liquid of claim 2 , wherein said reactive blocked prepolymer is blocked by reaction of a polyisocyanate oligomer with an alcohol (meth)acrylate claim 2 , amine (meth)acrylate claim 2 , maleimide claim 2 , or n-vinylformamide monomer blocking agent.8. The liquid of claim 2 , wherein said reactive diluent is present and comprises an acrylate claim 2 , a methacrylate claim 2 , a styrene claim 2 , an acrylic acid claim 2 , a vinylamide claim 2 , a vinyl ether claim 2 , a vinyl ester claim 2 , a polymer containing any one or more of the foregoing claim 2 , or a combination of two or more of the foregoing.9. The liquid of claim 2 , wherein said chain extender comprises at least one diol ...
Подробнее