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    Process for the stereolithographic preparation of three-dimensional objects using a radiation-curable liquid formulation which contains fillers
    4.
    发明专利
    Process for the stereolithographic preparation of three-dimensional objects using a radiation-curable liquid formulation which contains fillers 未知

    公开(公告)号：AU1192497A

    公开(公告)日：1997-07-17

    申请号：AU1192497

    申请日：1996-12-10

    Applicant: 3D SYSTEMS INC

    Inventor： SCHULTHESS ADRIAN ,  STEINMANN BETTINA ,  HOFMANN MANFRED

    IPC: B29C67/00 ,  G03F7/00

    Abstract: PCT No. PCT/EP96/05508 Sec. 371 Date Jun. 18, 1998 Sec. 102(e) Date Jun. 18, 1998 PCT Filed Dec. 10, 1996 PCT Pub. No. WO97/23342 PCT Pub. Date Jul. 3, 1997The present invention relates to a process for the stereolithographic preparation of a three-dimensional object, wherein the object is built in a container which contains a radiation-curable liquid formulation with fillers by a repeated alternating succession of process steps (a) and (b). In step (a), a layer of the radiation-curable liquid formulation, one limitation of which is the surface of the formulation, is cured using suitable radiation within an surface area which corresponds to the desired cross-section of the three-dimensional object to be formed at the level of this layer. In step (b), said cured layer is coated with a new layer of the radiation-curable liquid formulation. The process comprises homogenizing the radiation-curable liquid formulation continuously or discontinuously to such an extent that there is no noticeable change in the filler content of the radiation-curable liquid formulation in the area of that layer with which the cured layer is coated in step (b). This process enables the skilled person to choose fillers solely according to the purpose envisaged therefor without encountering technical problems or problems relating to the quality of the stereolithographically produced object resulting from sedimentation of the fillers during preparation of the object.

    5.
    发明专利
    未知

    公开(公告)号：DE60312443D1

    公开(公告)日：2007-04-26

    申请号：DE60312443

    申请日：2003-07-16

    Applicant: 3D SYSTEMS INC

    Inventor： STEINMANN BETTINA

    IPC: B29C67/00 ,  G03F7/027 ,  B29K35/00 ,  B29K63/00 ,  C08G59/68 ,  G03F7/00 ,  G03F7/038

    Abstract: A liquid radiation-curable composition that comprises (A) at least one polymerizing organic substance comprising a mixture of (1) at least one alicyclic epoxide having at least two epoxy groups; and (2) at least one difunctional or higher functional glycidylether of a polyhydric compound; (B) at least one free-radical polymerizing organic substance comprising a mixture of (1) optionally, at least one trifunctional or higher functional (meth)acrylate compound; and (2) at least one aromatic di(meth)acrylate compound; (C) at least one cationic polymerization initiator; (D) at least one free-radical polymerization initiator; (E) optionally, at least one hydroxyl-functional aliphatic compound; and (F) at least one hydroxyl-functional aromatic compound; wherein the concentration of hydroxyl groups in the radiation-curable composition is at least about 1.1 equivalent OH groups per kilogram; wherein the concentration of epoxy groups in the radiation-curable composition is at least about 5.5 equivalent epoxy groups per kilogram; and wherein the amount of trifunctional or higher functional (meth)acrylate compound (B)(1) is from 0% to about 3% of the composition and the amount of aromatic di(meth)acrylate compound (B)(2) is at least 10% of the composition.

    6.
    发明专利
    未知

    公开(公告)号：DE60312443T2

    公开(公告)日：2007-12-13

    申请号：DE60312443

    申请日：2003-07-16

    Applicant: 3D SYSTEMS INC

    Inventor： STEINMANN BETTINA

    IPC: B29C67/00 ,  G03F7/027 ,  B29K35/00 ,  B29K63/00 ,  C08G59/68 ,  G03F7/00 ,  G03F7/038

    Abstract: A liquid radiation-curable composition that comprises (A) at least one polymerizing organic substance comprising a mixture of (1) at least one alicyclic epoxide having at least two epoxy groups; and (2) at least one difunctional or higher functional glycidylether of a polyhydric compound; (B) at least one free-radical polymerizing organic substance comprising a mixture of (1) optionally, at least one trifunctional or higher functional (meth)acrylate compound; and (2) at least one aromatic di(meth)acrylate compound; (C) at least one cationic polymerization initiator; (D) at least one free-radical polymerization initiator; (E) optionally, at least one hydroxyl-functional aliphatic compound; and (F) at least one hydroxyl-functional aromatic compound; wherein the concentration of hydroxyl groups in the radiation-curable composition is at least about 1.1 equivalent OH groups per kilogram; wherein the concentration of epoxy groups in the radiation-curable composition is at least about 5.5 equivalent epoxy groups per kilogram; and wherein the amount of trifunctional or higher functional (meth)acrylate compound (B)(1) is from 0% to about 3% of the composition and the amount of aromatic di(meth)acrylate compound (B)(2) is at least 10% of the composition.

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