Covestro Deutschland Ag

Stratasys, Inc.

Covestro Intellectual Property Gmbh & Co. Kg

Christoph Tomczyk

Dirk Achten

Hans-Josef Laas

Roland Wagner

Michael Ludewig

Thomas Buesgen

Florian Johannes Stempfle

Jan Weikard

Thomas Fäcke

Thomas Büsgen

Frank Richter

Christoph Eggert

Nicolas Degiorgio

Bettina Mettmann

Dirk Dijkstra

Levent Akbas

Jörg Tillack

Paul Heinz

Florian Golling

Richard Meisenheimer

Alisa Kayser

Arnaud Guedou

Rolf Albach

The present invention relates to an orthodontic splint made of a crosslinked polymer, wherein the crosslinked polymer has a glass transition temperature T, determined by means of dynamic-mechanical analysis at a frequency of 1/s DMA as peak tan δ, of ≥25° C. and ≤60° C., a modulus of elasticity, determined by means of dynamic-mechanical analysis as the storage modulus E' at a frequency of 1/s at 35° C., of ≥500 MPa and ≤4000 MPa, and a loss factor tan δ, determined by means of dynamic-mechanical analysis at a frequency of 1/s at 35° C., of ≥0.08. The invention further relates to a process for producing such splints.

3D-printed orthodontic splint made of crosslinked polymers

The invention relates to a method for producing a polymer comprising the following steps: (A) depositing a radically cross-linkable resin, obtaining a radically cross-linked resin; and (B) treating the radically cross-linked resin under conditions which are sufficient to trigger a chemical reaction that is different from the radical cross-linking in the radically cross-linked resin. The radically cross-linkable resin comprises a curable component, in which there are NCO groups, olefinic C═C double bonds and epoxide groups, and the chemical reaction in the radically cross-linked resin that is different from the radical cross-linking is the reaction of NCO groups and epoxide groups to form oxazolidinone groups.

Method for producing a cross-linkable polymer with the formation of oxazolidinones

A method for producing an article in which a layer with a radically cross-linkable resin is selectively crosslinked at least partially. This takes place according to a selected cross section of the article to be formed by means of selective application of a radical initiator. The at least partially crosslinked material is added on layer by layer to a carrier or to previous layers bonded to the carrier. A system that is suitable for carrying out the method according to the invention has a substrate, a control unit, an application unit for applying the resin to the substrate, an application unit for applying an initiator to the resin, an energy exposure unit and a contacting unit.

Method for producing an article by layer-by-layer buildup with separately patterned resin and initiator wherein the resin has a storage modulus greater than loss modulus at 20 C

The present invention relates to polymerizable compositions which contain components that can be crosslinked both via isocyanurate bonds and by a radical reaction mechanism. The invention further relates to methods by way of which polymers can be produced from said compositions.

Dual-curing isocyanurate polymers

A process for producing an object from a precursor comprises the steps of: I) depositing a free-radically crosslinked resin atop a carrier to obtain a ply of a construction material joined to the carrier which corresponds to a first selected cross section of the precursor; II) depositing a free-radically crosslinked resin atop a previously applied ply of the construction material to obtain a further ply of the construction material which corresponds to a further selected cross section of the precursor and which is joined to the previously applied ply; III) repeating step II) until the precursor is formed; IV) treating the precursor obtained after step III) under conditions sufficient to at least partially trimerize to isocyanurate groups NCO groups present in the free-radically crosslinked resin of the obtained precursor to obtain the object.

Method for producing an object from a precursor, and use of a radically crosslinkable resin in an additive production method

The invention relates to a method for producing an object from a construction material, the construction material comprising radically crosslinkable groups, NCO groups and groups having Zerewitinoff active H atoms, and the object being a three-dimensional object and/or a layer. During and/or after the production of the object, the construction material is heated to a temperature of &#x3e;50&#xb0; C., and the construction material comprises one or more cyclic tin compounds of formula F-I, F-II and/or F-III.

Dual cure method using Zerewitinoff-active H tin catalysts

An additive manufacturing method wherein the carrier () is within a vessel (), the vessel contains the free-radically crosslinkable resin () and a liquid () which is immiscible with the free-radically cross-linkable resin () and has a higher density than the free-radically crosslinkable resin (), such that the free-radically crosslinkable resin () floats on top of the liquid () and, prior to each step II), the distance between the carrier () and the free-radically crosslinkable resin () is altered such that a layer of the free-radically crosslinkable resin forms above the uppermost surface (), viewed in vertical direction, of the previously deposited layer of the construction material () and at least partially forms contact with this uppermost surface () of the previously deposited layer of the construction material (). The free-radically crosslinkable resin () comprises a urethane (meth)acrylate. The invention further relates to the use of a free-radically crosslinkable resin comprising a urethane (meth)acrylate as construction material in a two-phase 3D printing method.

Two-phase 3D printing method

A process for manufacturing an object involves the steps of: I) depositing a radically cross-linked resin on a carrier so that a layer of a structuring material joined to the carrier is obtained, said layer corresponding to a first selected cross-section of the object; II) depositing a radically cross-linked resin on a previously applied layer of the structuring material so that an additional layer of the structuring material is obtained which corresponds to a further selected cross-section of the object and which is joined to the previously applied layer; III) repeating step II) until the object is formed, wherein the deposition of a radically cross-linked resin in steps I) and II) includes the application of a radically cross-linkable resin to the carrier or the previously applied layer and is performed at least in step II) by applying energy to a selected region of a radically cross-linkable resin, corresponding to the selected cross-section of the object, the radically cross-linkable resin having a viscosity (23&#xb0; C., DIN EN ISO 2884-1) of &#x2265;5 mPas to &#x2264;100,000 mPas. The invention further relates to the use of such a resin in an additive manufacturing process. The radically cross-linkable resin comprises a curable component which is obtained by reacting a polyisocyanate or a polyisocyanate descendant containing at least one oxadiazine trione group (formula I) with a compound that contains acrylate, methacrylate or vinyl ether double bonds and 25 Zerewitinoff active H atoms.

Process for manufacturing an object, and use of a radically cross-linkable resin in an additive manufacturing process

A process for producing an object from a precursor comprises the steps of: depositing a free-radically crosslinked resin atop a carrier to obtain a ply of a construction material joined to the carrier which corresponds to a first selected cross section of the precursor; depositing a free-radically crosslinked resin atop a previously applied ply of the construction material to obtain a further ply of the construction material which corresponds to a further selected cross section of the precursor and which is joined to the previously applied ply; repeating step II) until the precursor is formed; wherein the depositing of a free-radically crosslinked resin at least in step II) is effected by exposure and/or irradiation of a selected region of a free-radically crosslinkable resin corresponding to the respectively selected cross section of the object and wherein the free-radically crosslinkable resin has a viscosity (23&#xb0; C., DIN EN ISO 2884-1) of &#x2265;5 mPas to &#x2264;100000 mPas. In the process the free-radically crosslinkable resin comprises a curable component in which NCO groups and olefinic C&#x2550;C double bonds are present, wherein in the curable component the molar ratio of NCO groups to olefinic C&#x2550;C double bonds is in a range from &#x2265;1:5 to &#x2264;5:1.

Growing community of inventors

Leverkusen, Germany

Christoph Tomczyk