Methods of producing polyurea three-dimensional objects from materials having multiple mechanisms of hardening
First Claim
1. A method of forming a three-dimensional object comprised of polyurea, or a copolymer of polyurea and polyurethane, 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 a mixture of;
(i) a reactive blocked diisocyanate, (ii) a polyamine chain extender, and (iii) a photoinitiator,(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 de-block the diisocyanate and form from said three-dimensional intermediate said three-dimensional object comprised of polyurea, or a copolymer of polyurea and polyurethane.
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Abstract
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 diisocyante, 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.
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Citations
29 Claims
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1. A method of forming a three-dimensional object comprised of polyurea, or a copolymer of polyurea and polyurethane, said method comprising:
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(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 a mixture of;
(i) a reactive blocked diisocyanate, (ii) a polyamine chain extender, and (iii) a photoinitiator,(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 de-block the diisocyanate and form from said three-dimensional intermediate said three-dimensional object comprised of polyurea, or a copolymer of polyurea and polyurethane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification