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US 11,859,057 B2Granted
Partially reversible thermosets useful for recycling
AssigneeCarbon, Inc.
InventorsJustin Poelma, Rick Hubertus Nicolas Curvers
Life of this patent
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Abstract
Provided herein is a method of recycling reactive prepolymers from additively manufactured articles or recovered coating material that comprises a crosslinked polymer formed from a single-cure resin comprising a reactive blocked prepolymer and a crosslinker, by forming and recovering a regenerated reactive prepolymer. Light-polymerizable resins, methods of making recyclable objects from such resins, and methods for sustainable manufacturing are also provided.
Claims20
A method of recycling a thermoset material, comprising:
- (a) providing the thermoset material, wherein said thermoset material is produced by the process of light polymerizing a single-cure resin in an additive manufacturing or coating process, said resin comprising:
- (i) a reactive blocked prepolymer;
- (ii) a crosslinker;
- (iii) a photoinitiator;
- (iv) optionally a reactive diluent;
- (v) optionally a light absorber;
- (vi) optionally pigments and/or dyes;
- and
- (vii) optionally at least one filler;
- said thermoset material comprised of at least 70 percent by weight of a crosslinked polymer, said crosslinked polymer consisting essentially of said reactive blocked prepolymer, said crosslinker, and said reactive diluent when included, in light polymerized, cross-linked form;
- (b) comminuting said thermoset material into a particulate material;
- and
- (c) combining said particulate material with a reactive blocking agent or reactive capping agent to form a mixture, and heating said mixture for a time sufficient to form a regenerated reactive prepolymer.
10 more elements
Dependencies are inferred from the claim text.