METHODS OF PRODUCING POLYURETHANE THREE-DIMENSIONAL OBJECTS FROM MATERIALS HAVING MULTIPLE MECHANISMS OF HARDENING

摘要

A method of forming a three-dimensional object of polyurethane, polyurea, or copolymer thereof is carried out by: (a) providing a carrier and an optically transparent member having a build surface, the carrier and the build surface defining a build region therebetween; (b) filling the build region with a polymerizable liquid, the polymerizable liquid including 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; (c) irradiating the build region with light through the optically transparent member to form a solid blocked polymer scaffold and advancing the carrier away from the build surface to form a three-dimensional intermediate having the same shape as, or a shape to be imparted to, the three-dimensional object, with the intermediate containing the chain extender; and then (d) heating or microwave irradiating the three-dimensional intermediate sufficiently to form from the three-dimensional intermediate the three-dimensional object of polyurethane, polyurea, or copolymer thereof.

主权项

1. A method of forming a three-dimensional object comprised of polyurethane, polyurea, or copolymer thereof, said method comprising:
(a) providing a carrier and an optically transparent member having a build surface, said carrier and said build surface defining a build region therebetween; (b) filling said build region with a polymerizable liquid, said polymerizable liquid comprising 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; (c) irradiating said build region with light through said optically transparent member to form a solid blocked polymer scaffold and advancing said carrier away from said build surface to form a three-dimensional intermediate having the same shape as, or a shape to be imparted to, said three-dimensional object, with said intermediate containing said chain extender; and then (d) heating or microwave irradiating said three-dimensional intermediate sufficiently to form from said three-dimensional intermediate said three-dimensional object comprised of polyurethane, polyurea, or copolymer thereof.