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公开(公告)号：US11618832B2
公开(公告)日：2023-04-04
申请号：US16325991
申请日：2017-08-17
Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
Inventor： Maruti Hegde , Timothy E. Long , Viswanath Meenakshisundaram , Christopher B. Williams , Nicholas Chartrain
IPC: C08F2/46 , C08F2/50 , C08G61/04 , C09D11/101 , B33Y70/00 , C09D11/102 , B33Y10/00 , B29C64/135
Abstract: Polymer resins for the vat photopolymerization of thermoplastics are provided, in particular for the vat photopolymerization of thermoplastics with exception thermal stability and mechanical properties. In some aspects, the polymer resins are prepared by ring opening of an aromatic dianhydride with an alcohol containing an acrylate or methacrylate to produce a photocrosslinkable diacid monomer; conversion of the photocrosslinkable diacid monomer to a photocrosslinkable diacyl chloride; and polymerization of the photocrosslinkable diacyl chloride with an aromatic diamine to produce a photocrosslinkable precursor polymer. Upon crosslinking and drying, a thermal imidization can yield aromatic polyimide polymers with high yield and with micron-scale structural resolution.
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公开(公告)号：US12285910B2
公开(公告)日：2025-04-29
申请号：US16954124
申请日：2018-12-15
Applicant: Virginia Tech Intellectual Properties, Inc.
IPC: B29C64/255 , B29C64/124 , B29C64/135 , B29C64/209 , B29C64/245 , B29C64/264 , B29C64/295 , B33Y10/00 , B33Y30/00 , B33Y70/00 , C08F120/68 , C08F283/00 , C08F283/06 , C08L5/00 , B29K33/00 , B29K75/00 , B29K105/00 , B29L31/52
Abstract: In various aspects, top-down stereolithography apparatus and methods of use thereof are provided herein that allow for additive manufacturing of an article from a high-viscosity resin. The apparatus and methods can print resins having viscosities higher than conventional systems, e.g. viscosities up to about 100 Pa·s at the elevated temperature. The resin may have a room temperature viscosity of about 100 Pa·s, about 250 Pa·s, about 1000 Pa·s, or more. In some aspects, the resin is a solid at room temperature. The apparatus and methods do not rely upon solvents or other viscosity modifiers being added to the resin, and are capable of top-down additive manufacturing approaches which provide reduced stress on the printed article.
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公开(公告)号：US20200369831A1
公开(公告)日：2020-11-26
申请号：US16969826
申请日：2019-02-13
Applicant: Virginia Tech Intellectual Properties, Inc.
Abstract: In various aspects, a polymer resin is provided for vat photopolymerization. The resin can include a polyamic acid salt formed from the addition of a photocrosslinkable amine to a polyamic acid. The resin can include a photoinitiator suitable for initiating crosslinking of the photocrosslinkable amine when exposed to a light source of a suitable wavelength and intensity. The polyamic acid can be formed, for instance, by the addition of a diamine to a suitable dianhydride. Methods of additive manufacturing using the resins are also provided.
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Patent Agency Ranking
公开(公告)号：US20240300017A1
公开(公告)日：2024-09-12
申请号：US18598861
申请日：2024-03-07
Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
Inventor： Kazi Moshiur Rahman , Christopher B. Williams
Abstract: Embodiments are described for forming regions of varying porosity within an additive manufacturing (AM) object through selective deposition of a binding agent during fabrication. Upon sintering, the selectively applied binding agent forms stochastic regions of porosity within the object that are not externally visible. In some implementations, embedded porous regions are selectively generated to form an identifier region that can be used as a unique part identification tag identifiable through non-destructive evaluation. The identifier tag may be useful in anti-counterfeiting security for parts fabricated through binding agent jetting (BT) and other additive manufacturing techniques.
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公开(公告)号：US12220860B2
公开(公告)日：2025-02-11
申请号：US17903013
申请日：2022-09-05
Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
Abstract: Photocurable colloid binders are provided that overcome deficiencies associated with 3D printing of high molecular weight polymers via VAT photopolymerization. Methods of additive manufacturing are also provided using the binders. The approaches described herein effectively decouple the viscosity-molecular weight relationship by synthesizing and processing photo-reactive aqueous colloids that are sequestered within a photocrosslinkable scaffold. Sequestering polymers within discrete internal phases prevents inter-particle entanglement of the polymer chains, thus ensuring low viscosity. VP of polymer colloids results in a solid green body embedded with high molecular weight polymer particles. A post-processing heated drying step allows the polymers to coalesce and further entangle, forming a semi-interpenetrating network with mechanical performance of the high molecular weight material. The resins can further include inorganic particles such as silica and other ceramics, metal particles, and the like. The coalescence can result in the particles being encapsulated in polymer, yielding unique hybrid materials with tunable properties.
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公开(公告)号：US12018127B2
公开(公告)日：2024-06-25
申请号：US16969826
申请日：2019-02-13
Applicant: Virginia Tech Intellectual Properties, Inc.
IPC: C08G73/10 , B29C64/124 , B29C64/30 , B33Y10/00 , B33Y40/20 , B33Y70/00 , B29K79/00 , B29K105/00
CPC classification number: C08G73/105 , B29C64/124 , B29C64/30 , B33Y10/00 , B33Y40/20 , B33Y70/00 , B29K2079/08 , B29K2105/0002
Abstract: In various aspects, a polymer resin is provided for vat photopolymerization. The resin can include a polyamic acid salt formed from the addition of a photocrosslinkable amine to a polyamic acid. The resin can include a photoinitiator suitable for initiating crosslinking of the photocrosslinkable amine when exposed to a light source of a suitable wavelength and intensity. The polyamic acid can be formed, for instance, by the addition of a diamine to a suitable dianhydride. Methods of additive manufacturing using the resins are also provided.
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公开(公告)号：US11433601B2
公开(公告)日：2022-09-06
申请号：US17442807
申请日：2020-03-26
Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
Abstract: Photocurable colloid binders are provided that overcome deficiencies associated with 3D printing of high molecular weight polymers via VAT photopolymerization. Methods of additive manufacturing are also provided using the binders. The approaches described herein effectively decouple the viscosity-molecular weight relationship by synthesizing and processing photo-reactive aqueous colloids that are sequestered within a photocrosslinkable scaffold. Sequestering polymers within discrete internal phases prevents inter-particle entanglement of the polymer chains, thus ensuring low viscosity. VP of polymer colloids results in a solid green body embedded with high molecular weight polymer particles. A post-processing heated drying step allows the polymers to coalesce and further entangle, forming a semi-interpenetrating network with mechanical performance of the high molecular weight material. The resins can further include inorganic particles such as silica and other ceramics, metal particles, and the like. The coalescence can result in the particles being encapsulated in polymer, yielding unique hybrid materials with tunable properties.
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公开(公告)号：US20200270038A1
公开(公告)日：2020-08-27
申请号：US15930854
申请日：2020-05-13
Inventor： Travis Kyle Hodgdon , Douglas Michael Graham , Michael Sean Farrell , Corey James Kenneally , Christopher B. Williams , Callie Zawaski
Abstract: A water soluble container comprises a water soluble shell enclosing a volume. The water soluble shell comprises a set of voxels.
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