Stratasys, Inc.

Covestro Deutschland Ag

Covestro Intellectual Property Gmbh & Co. Kg

Thomas Buesgen

Dirk Achten

Roland Wagner

Nicolas Degiorgio

Bettina Mettmann

Jonas Kuenzel

Michael Kessler

Peter Reichert

Christoph Tomczyk

Martin Melchiors

Wolfgang Arndt

Florian Johannes Stempfle

Joerg Buechner

Joerg Tillack

Harald Kraus

Fabian Schuster

Ting Liu

Maximilian Wolf

Hans-Josef Laas

Michael Ludewig

Mathias Matner

Levent Akbas

Thomas Faecke

Jan Suetterlin

Thomas Prenveille

Jari Birth

Ralf Rott

Bernd Garska

Anne Fischer

Rolf Albach

The invention relates to a method for modifying an object comprising the step of: I) providing an object which is made at least partially of a construction material comprising a thermoplastic polyurethane. The method also comprises the following steps: II) contacting, at least in part, the construction material, for a first predetermined period of time, with a first liquid comprising ≥80% by weight, based on the total weight of the first liquid, of a polar aprotic solvent; III) contacting, for a second predetermined period of time, the areas of the construction material that were in contact with the liquid in step II) with a second liquid comprising ≥80% by weight, based on the total weight of the second liquid, of a polar protic solvent. Preferably, the first liquid is DMSO or acetone and the second liquid is water.

Method for modifying a 3D printed object

The present invention relates to a fibre-reinforced 3D-printed elastic product (1, 3, 4, 7, 10, 12), wherein the product comprises a weight proportion of ≥50% of a polymer having a mean molecular weight of ≥5000 g/mol, measured by means of GPC, and a weight proportion of ≥0.5% and ≤20% of one or more fibres having an aspect ratio of ≥100 and a length of ≥3 cm and ≤1000 cm, the product being produced at least in part by means of an FFF (Fused Filament Fabrication) method, and the product having a tensile modulus of ≥1.5 GPa in the region of the fibre reinforcement and in the direction of the fibre symmetry axis. The product also has a tensile modulus, measured according to DIN EN ISO 527-1, of ≤1.2 GPa in the region of the fibre reinforcement and perpendicular to the fibre symmetry axis, and has a yield strength of >5%, measured according to DIN EN ISO 527-1, perpendicular to the fibre symmetry axis.

3D-printed elastic products reinforced by means of continuous fibres and having asymmetrical elastic properties

A method for producing an object comprises the step of producing the object by means of an additive manufacturing process from a construction material. The construction material comprises a first polyurethane polymer which has: a weight percentage ratio of O to N of ≥2 to ≤2.5, determined by elementary analysis; a weight percentage ratio of N to C of ≥0.1 to ≤0.25, determined by elementary analysis; a full-width at half maximum of the melting peak of ≤20 K, determined by dynamic differential scanning calorimetry DSC (2heating at heating rate 20 k/min); and a difference between the melting temperature and the recrystallisation temperature of ≥5 K and ≤100 K, determined by dynamic differential scanning calorimetry DSC (2heating) at a heating and cooling rate of 20 K/min.

Additive manufacturing process using a building material having a high hard segment content

The invention relates to a method for applying a material containing a meltable polymer comprising the step of applying a filament of the at least partially molten material from a discharge opening of a discharge element onto a substrate. The meltable polymer has the following properties: —a melting point (DSC, differential scanning calorimetry; second heating with a heating rate of 5° C./min) in a range from ≥40° C. to ≤120° C.; —a glass transition temperature (DMA, dynamic mechanical analysis in accordance with DIN EN ISO 6721-1:2011) in a range from ≥−70° C. to ≤30° C.; —a storage modulus G' (parallel plate oscillation viscometer in accordance with ISO 6721-10:2015 at a frequency of 1/s) at 20° C. above the melting point of ≥1·10Pa; —a storage modulus G′ (parallel plate oscillation viscometer in accordance with ISO 6721-10:2015 at a frequency of 1/s) at 10° C. below the melting point with prior heating to a temperature of 20° C. above the melting point and subsequent cooling with a cooling rate of 1° C./min of ≤1·10Pa; wherein the filament has an application temperature of ≥100° C. above the melting point of the meltable polymer for ≤5 minutes during the application process and wherein the meltable polymer further has the property that the storage modulus G′ (parallel plate oscillation viscometer in accordance with ISO 6721-10:2015 at a frequency of 1/s) of the meltable polymer at the highest application temperature reached during the application process is smaller by a factor of ≥10 than the storage modulus G′ (parallel plate oscillation viscometer in accordance with ISO 6721-10:2015 at a frequency of 1/s) at a temperature of 20° C. above the melting point of the meltable polymer.

Method for applying a material containing a meltable polymer, more particularly a hot-melt adhesive, above the decomposition temperature thereof

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 present invention relates to a method for functionalizing a workpiece surface, comprising the following steps: a) providing a workpiece; b) providing a film; c) functionalizing at least one film side by the location-selective application of a functionalization composition comprising a polymer material onto part of the film side in one or more layers by means of a 3D printing process; d) creating an integrally bonded or interlocking connection between the workpiece surface and the film functionalized in step c) by bringing the film into contact with at least part of the workpiece surface, wherein the integrally bonded or interlocking connection to the workpiece surface is achieved with a functionalized film side. The invention further relates to workpieces having a surface functionalized according to the invention.

Film areas functionalized by means of 3D printing for finishing workpiece surfaces

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 deformable body, wherein the body is constructed from a multiplicity of layers of a polymer construction material and in which a construction direction is defined perpendicular to the layers. The body preferably comprises layers with a multiplicity of curve pairs () which are formed by the construction material and which run in the same direction as one another, the curve pairs comprise in each case two periodic curves () running oppositely with respect to one another, and the curve pairs comprise portions of maximum spacing to one another () and portions of minimum spacing to one another (). In one part of the layers, in adjacent curve pairs (), at least one portion of maximum spacing () of one curve is connected to a portion of maximum spacing () of an adjacent curve, in a further part of the layers, in adjacent curve pairs (), at least one portion of maximum spacing () of one curve is not connected to a portion of maximum spacing () of an adjacent curve, in a further part of the layers, in adjacent curve pairs (), at least a part of the portions of minimum spacing () are connected to one another, and in a further part of the layers, in adjacent curve pairs (), at least a part of the portions of minimum spacing () are not connected to one another. The invention also relates to a method for producing the body and to a device for supporting and/or bearing a person having the body according to the invention. The boy may be used inter alia as a mattress or as a vehicle seat.

Deformable body and method for the production thereof

The present invention relates to a method for producing a treated object, comprising the steps of: applying a layer of particles to a target area; applying a liquid binder to a selected portion of the layer in accordance with a cross-section of the object, so that the particles in the selected portion are bonded; repeating the steps of applying a layer of particles and applying a binder for a plurality of layers so that the bonded portions of the adjacent layers are bonded to form an object, wherein at least a part of the particles comprises a meltable polymer. A binder which cures by cross-linking is preferably selected as the binder. The obtained object is at least partially contacted with a liquid heated to &#x2265;T or with a powder bed heated to &#x2265;T in order to obtain the treated object. T represents a temperature of &#x2265;25&#xb0; C., the liquid does not represent a solvent or a reaction partner for the binder present in the object and the meltable polymer, and the powder bed is different from the particles of the meltable polymer. The invention also relates to a treated object that can be obtained by the method according to the invention.

Method for producing a treated, 3D printed object

The invention relates to a method for producing a three-dimensional object by means of a powder-based additive production method from at least one first powdery material, wherein the at least one first powdery material comprises at least one first compound having a first reactive group a). The first reactive group a) is selected from the group consisting of an isocyanate group, a blocked isocyanate group, or a mixture thereof. The invention further relates to a component produced using the method according to the invention, and to powdery material that is suited for the method according to the invention.

Method for producing products by means of additive manufacturing methods using reactive powders, and products thereof

A method for producing an object from a filamentary building material in an additive fused deposition modelling process, comprising the steps of: providing the building material; transporting the building material into a printhead at a feed rate for the building material, wherein the building material is transported between a driven drive wheel and a second wheel; melting the building material by means of a heating device in the printhead; discharging the molten building material to a discharge location, corresponding to a selected cross section of the object to be produced, at a discharge rate through an orifice of the printhead, with relative movement of the printhead in relation to the discharge location at a predetermined speed to movement along a predetermined path, wherein the path has at each location a curvature that can assume a positive value, zero or a negative value; wherein a control unit controls at least the drive of the drive wheel, the heating device in the printhead and the movement of the printhead in dependence on the curvature of the printing path. Likewise disclosed is a control unit for use in an installation for carrying out an additive fused deposition modelling process with a filamentary building material.

3-D printing process with path-dependent control of the printing path

The invention relates to a method for producing an object from different powdered components by means of additive manufacturing, wherein a plurality of powdered components having different melting points are simultaneously placed in precise positions, and the powder coating () is subsequently thermally treated. The construction material is, for example, polyether ether ketone (PEEK), polyaryl ether ketone (PAEK), polyether ketone ketone (PEKK), polyether sulfone, polyimide, polyether imide, polyester, polyamides, polycarbonates, polyurethanes, polyvinyl chloride, polyoxymethylene, polyvinyl acetate, polyacrylates, polymethacrylates, polyethylene, polypropylene, polylactide, ABS (acrylonitrile butadiene styrene copolymers), PETG (glycol modified polyethylene terephthalate), polystyrene, or mixtures thereof. The supporting material is an inorganic salt of the alkali metals, an inorganic salt of the alkaline earth metals, or a mixture thereof.

Powder coating method for manufacturing 3D-printed components having improved mechanical properties

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 method of applying a material comprising a fusible polymer comprises the step of: The fusible polymer has the following properties: wherein the filament, during the application process, has an application temperature of &#x2265;100&#xb0; C. above the melting point of the fusible polymer for &#x2264;20 minutes. There are still free NCO groups in the material including the fusible polymer.

Method for applying a material containing a meltable polymer with free NCO groups

A method of applying a material comprising a fusible polymer comprises the step of: The fusible polymer has the following properties: There are furthermore blocked NCO groups present in the material comprising the fusible polymer.

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Leverkusen, Germany

Thomas Buesgen