Thiourethane polymers, method of synthesis thereof and use in additive manufacturing technologies

Abstract

The invention discloses thiourethane polymers, a method of synthesis thereof and use in the additive manufacturing technologies, including a semi-crystalline thiourethane polymer. The semi-crystalline thiourethane polymer comprises a sequential chain of a first type of monomer covalently bonded to a second type of monomer via thiourethane linkages. Each of the first type of monomer includes two or more thiol functional groups and each of the second type of monomer includes two or more isocyanate functional groups. The first and second types of monomers are polymerized together in an anionic step-growth polymerization reaction that is catalyzed by a non-nucleophillic base having a pKa greater than 7, produced by photo-initiated decomposition of a photolatent base. A method of synthesizing, and polymer jetting and stereolithography methods of manufacturing a polymer part, are also disclosed.

Description

[0001] This application is an invention with the application date of March 14, 2017, the application number "201780017559.7", and the name "thiourethane polymer, its synthesis method and use in additive manufacturing technology" A divisional application of a patent application. [0002] Cross References to Related Applications [0003] This application claims the benefit of U.S. Provisional Patent Application No. 62 / 308,664, filed March 15, 2016, and U.S. Nonprovisional Patent Application No. 15 / 458,220, filed March 14, 2017, under 35 U.S.C. § 119(e) , said application is hereby incorporated by reference in its entirety as if fully set forth herein. technical field [0004] The present application generally relates to thiourethane polymers, and more specifically semi-crystalline forms of such polymers, methods of synthesis and the use of such polymers and methods for additive manufacturing technology applications. Background technique [0005] Industrial additive manufact...

AI Technical Summary

Problems solved by technology

However, such resins generally exhibit higher viscosity and thus longer print times and higher costs

Furthermore, 3D printed parts produced using such resins can have poor mechanical properties due to poor interlayer adhesion

For example, the part can have excellent mechanical properties when coaxial with the print layer direction (e.g. X and Y axes), but have poor mechanical properties when pressurized perpendicular to the print layer (e.g. Z axis)

Furthermore, the amorphous structure of such polymers limits the performance of the 3D parts produced from them compared to semi-crystalline engineered plastics

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