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    Pulverulent thermoplastic polymer blends
    1.
    发明授权
    Pulverulent thermoplastic polymer blends 有权

    公开(公告)号：US12195625B2

    公开(公告)日：2025-01-14

    申请号：US18485238

    申请日：2023-10-11

    Applicant: Stratasys, Inc.

    Inventor： Liang Chen ,  Chen Xu ,  Leslie J. Vescio ,  Bruce D. Lawrey

    IPC: C08L75/08 ,  B29B9/12 ,  B29B13/10 ,  B33Y70/00 ,  C08G18/32 ,  C08G18/73 ,  C08L75/04 ,  C08L75/06

    Abstract: The present disclosure is directed to pulverulent thermoplastic polymer blends comminuted to a particle size of less than 300 μm. The pulverulent thermoplastic polymer blends can include a first thermoplastic polyurethane and a second thermoplastic polyurethane at a weight ratio of from about 90:10 to about 30:70 first thermoplastic polyurethane to second thermoplastic polyurethane. The first thermoplastic polyurethane can include a reaction product of a first reaction mixture consisting of or consisting essentially of an aliphatic diisocyanate having a number average molecular weight of from 140 g/mol to 170 g/mol and an aliphatic diol having a number average molecular weight of from 62 g/mol to 120 g/mol. The second thermoplastic polyurethane can include a reaction product of a second reaction mixture comprising a polyisocyanate, an isocyanate-reactive component having a number average molecular weight of from 500 g/mol to 10,000 g/mol, and a chain extender having a number average molecular weight of from 60 g/mol to 450 g/mol.

    THERMOPLASTIC ELASTOMER POWDERS FOR ADDITIVE MANUFACTURING AND THE USE THEREOF
    3.
    发明申请
    THERMOPLASTIC ELASTOMER POWDERS FOR ADDITIVE MANUFACTURING AND THE USE THEREOF 有权

    公开(公告)号：US20240417589A1

    公开(公告)日：2024-12-19

    申请号：US18708318

    申请日：2022-11-11

    Applicant: Stratasys, Inc.

    Inventor： Mark Janssen ,  Mark Petrus Franciscus Pepels

    IPC: C09D167/02 ,  B29C64/153 ,  B29K67/00 ,  B29K71/00 ,  B33Y10/00 ,  B33Y70/00 ,  C09D5/03

    Abstract: The invention is in the field of additive manufacturing. According to a first aspect of the invention, there is provided an additive manufacturing process for producing a printed article, comprising the step of sintering a powder composition comprising a thermoplastic elastomer, wherein the powder composition has a melting onset temperature Tm,onset and a melting peak temperature Tm,peak, which are measured according to ISO 11357-1/3 (2009), wherein Tm,peak minus Tm,onset is 30° C. or less; and wherein a test article printed from the powder composition has a rebound resilience of 50% or more, measured according to DIN 53512. According to a second aspect of the invention, there is provided a method of manufacturing a powder composition suitable for additive manufacturing sintering processes comprising the steps of: (a) providing a starting material comprising a thermoplastic elastomer; (b) heating the starting material of step (a) or the size-reduced material of step (c) to a temperature sufficient to increase the melting onset temperature of the material, thereby obtaining an annealed material; and (c) reducing the size of the starting material of step (a) or the annealed material of step (b) into a powder having a D50 particle size value of 20-150 m, thereby obtaining a size-reduced material, wherein size reduction step (c) is performed before or after heating step (b).

    NOVEL URETHANE ACRYLATE COMPOSITION
    5.
    发明公开
    NOVEL URETHANE ACRYLATE COMPOSITION 审中-公开

    公开(公告)号：US20240294800A1

    公开(公告)日：2024-09-05

    申请号：US18574350

    申请日：2022-06-21

    Applicant: Stratasys, Inc.

    Inventor： Liang CHEN

    IPC: C09D175/16 ,  B33Y70/00 ,  C08F283/00 ,  C08F290/06 ,  C08G18/10 ,  C08G18/44 ,  C08G18/75

    CPC classification number: C09D175/16 ,  B33Y70/00 ,  C08F283/006 ,  C08F290/067 ,  C08G18/10 ,  C08G18/44 ,  C08G18/755

    Abstract: Provided is a photopolymerizable composition comprising a blend of: a) from 40 wt. % to 70 wt. % of at least one urethane component; b) from 25 wt. % to 70 wt % of at least one monofunctional reactive diluent; c) from 0.1 wt. % to 5 wt. % of at least one initiator; and d) from 2 wt. % to 10 wt % of an amine-functional (meth)acrylate monomer of formula (I), C═C—CO—O—R1—NR2R3 (I); e) optionally, at least one multiple-functional reactive diluent; f) optionally, from 0.001 wt. % to 1 wt. % of an inhibitor, wherein the wt. % in all instances is based on total weight of the photopolymerizable composition, wherein at least one of R1, R2, and R3 is an alkyl group, and wherein the amine-functional (meth)acrylate monomer is not an amide. Also provided is a process of producing a photopolymerizable composition, the process comprising blending the ingredients of the prior sentence. Further provided is a process of producing a three-dimensional object, the process comprising the steps of: A) depositing the photopolymerizable composition according to the first sentence atop a carrier to obtain a layer of a construction material joined to the carrier which corresponds to a first selected cross section of the precursor; B) depositing additional photopolymerizable composition atop a previously applied layer of the construction material to obtain a further layer of the construction material which corresponds to a further selected cross section of the precursor and which is joined to the previously applied layer, C) repeating step B) until the precursor is formed, wherein the depositing of the photopolymerizable composition at least in step B) comprises introducing energy to a selected region of the photopolymerizable composition corresponding to the respectively selected cross section of the object.

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