Covestro Deutschland Ag

Covestro Intellectual Property Gmbh & Co. Kg

Jörg Tillack

Dirk Achten

Roland Wagner

Michael Ludewig

Thomas Büsgen

Christoph Tomczyk

Hans-Josef Laas

Martin Melchiors

Dieter Mager

Harald Kraus

Mathias Matner

Rolf Gertzmann

Christoph Eggert

Peter Reichert

Nicolas Degiorgio

Wolfgang Arndt

Heiko Hocke

Jörg Büchner

Florian Johannes Stempfle

Stefanie Eiden

Paul Heinz

Fabian Schuster

Florian Golling

Richard Meisenheimer

Jonas Künzel

Cornelia Steck

Ralf Rott

Alisa Kayser

Arnaud Guedou

Ingo Steffens

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 process for producing polyisocyanurate plastics having a functionalized surface, comprising the following steps: a) providing a polyisocyanate composition A) containing monomeric and/or oligomeric polyisocyanates; b) catalytically trimerizing the polyisocyanate composition A) so as to obtain a bulk polyisocyanurate material as intermediate; c) surface functionalizing the intermediate by contacting at least one surface of the intermediate with at least one functionalizing reagent D); d) continuing the catalytic trimerization. The invention further relates to a polyisocyanurate plastic having a functionalized surface obtainable from the process of the invention.

Process for producing polyisocvanurate plastics having functionalized surfaces

The present invention relates to a method for adhesively bonding substrates, said method comprising the following steps: I) at least one adhesive component (a) and at least one isocyanate component (b) are applied between at least two substrates; II) the substrates are pressed together. The method is characterized in that in step I), the adhesive component and the isocyanate component are applied separately to the substrate. The invention further relates to a composite obtained according to said method. In a preferred embodiment, an aqueous polyurethane dispersion or a polyurethane solution in organic solvents is used as the adhesive component.

Method for adhesively bonding substrates using adhesives

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.

Process for producing an object from a precursor and use of a free-radically crosslinkable resin in an additive manufacturing process

Growing community of inventors

Solingen, Germany

Jörg Tillack