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    METHOD AND DEVICE FOR THE PRODUCTION OF POLYAMIDE 6 PELLETS
    5.
    发明公开
    METHOD AND DEVICE FOR THE PRODUCTION OF POLYAMIDE 6 PELLETS 审中-公开

    公开(公告)号：US20240131751A1

    公开(公告)日：2024-04-25

    申请号：US18277350

    申请日：2021-02-15

    Applicant: T.EN ZIMMER GMBH

    Inventor： Stefan Deiß ,  Raimund Schwarz ,  Karl-Heinz Heldmann ,  Martin Baumert ,  Eva-Maria Kamp

    IPC: B29B9/12 ,  B29B9/10 ,  B29B9/16 ,  B29C48/00

    CPC classification number: B29B9/12 ,  B29B9/10 ,  B29B9/16 ,  B29C48/0022 ,  B29B2009/168 ,  C08G69/16

    Abstract: A method and a device for the production of polyamide 6 pellets wherein an intermediate drying is not necessary and a combined pelletizing and extraction take place. Depending on the intended use, the pellets may directly be used or subjected to further treatment steps. A device for the production of polyamide 6 pellets includes a melt device for providing a melt of polyamide 6, an underwater pelletizing system which is operable under increased pressure, and a vertical vessel having a cylindrical section and a tapered bottom section. The tapered bottom section is provided with a cooling device and is connected to a pipe comprising a screw and/or a rotary gate valve for conveying pellets. The device includes a circuit for circulating an aqueous solution of ε caprolactam through the underwater pelletizing system and the vertical vessel.

    Method for producing a population of particles of polyvinylidene difluoride or of particles of a copolymer comprising polyvinylidene difluoride
    6.
    发明授权
    Method for producing a population of particles of polyvinylidene difluoride or of particles of a copolymer comprising polyvinylidene difluoride 有权

    公开(公告)号：US11945919B2

    公开(公告)日：2024-04-02

    申请号：US17042102

    申请日：2019-03-26

    Applicant: Evonik Operations GmbH

    Inventor： Maximilian Alexander Dechet ,  Stephanie Kloos ,  Jochen Schmidt ,  Wolfgang Peukert

    IPC: C08J3/14 ,  B29B9/10 ,  B29C64/153 ,  B33Y70/00 ,  C08L27/16 ,  B29K27/00 ,  B33Y10/00

    CPC classification number: C08J3/14 ,  B29B9/10 ,  B29C64/153 ,  B33Y70/00 ,  B29K2027/16 ,  B33Y10/00 ,  C08J2327/16 ,  C08L27/16

    Abstract: The invention concerns a method for producing a population of particles of a polymer, wherein the polymer is polyvinylidene difluoride (=PVDF) or a copolymer comprising polyvinylidene difluoride, wherein the polymer is dissolved in an organic solvent, wherein molecules of the solvent comprise or consist of 3 to 22 carbon atoms, one or more oxygen atom(s) as heteroatom(s) and at most one carbocyclic or heterocyclic residue comprising carbon atoms which carbocyclic or heterocyclic residue is an aromatic residue, wherein the carbon atoms in the carbocyclic or heterocyclic residue are carbon atoms taken from said 3 to 22 carbon atoms, wherein the one or more oxygen atom(s) is/are part of at least one carboxylic acid ester group or carbonyl group, wherein the carbon atom in the carboxylic acid ester group and the carbonyl group is one of said 3 to 22 carbon atoms or/and at least one ether group and at most three hydroxyl groups, wherein in case of presence of at least one hydroxyl group the number of ether groups always exceeds the number of hydroxyl groups, wherein in case of presence of only 3 carbon atoms the molecule comprises additionally at least one pseudohalogen or additionally at least one further heteroatom selected from halogen, N, B, P and S, wherein the method comprises heating the solvent and the solid polymer immersed in the solvent at least until the polymer completely dissolves, cooling the solution until polymer particles are formed, and separating the particles formed during step b) from the solution or from a gel formed from the solution during step b).

    Method for producing a population of particles of polyethylene terephthalate or polybutylene terephthalate or of a copolymer comprising PET and/or PBT
    8.
    发明授权
    Method for producing a population of particles of polyethylene terephthalate or polybutylene terephthalate or of a copolymer comprising PET and/or PBT 有权

    公开(公告)号：US11939436B2

    公开(公告)日：2024-03-26

    申请号：US17042097

    申请日：2019-03-26

    Applicant: Evonik Operations GmbH

    Inventor： Maximilian Alexander Dechet ,  Stephanie Kloos ,  Jochen Schmidt ,  Wolfgang Peukert

    IPC: C08J3/14 ,  B29B9/10 ,  B29C64/153 ,  B33Y70/00

    CPC classification number: C08J3/14 ,  B29B9/10 ,  B29C64/153 ,  B33Y70/00 ,  C08J2367/02

    Abstract: The invention concerns a method for producing a population of particles of a polymer, wherein the polymer is poly-butylene terephthalate (=PBT) or polyethylene terephthalate (=PET) or a copolymer comprising polybutylene terephthalate and/or polyethylene terephthalate, wherein the polymer is dissolved in an organic solvent which solvent is selected such that it completely solubilizes the polymer only at a temperature of the solvent above 100° C., wherein the method comprises heating the solvent and the solid polymer immersed in the solvent at least to a first temperature, at which first temperature the polymer completely dissolves, cooling the solution until a second temperature is reached at which second temperature clouding of the solution starts, further cooling the solution at a rate in a range of 0.05 ° C./min to 5° C./min or keeping the solution at the second temperature or at a temperature up to 3° C. below the second temperature for at least 5 min and then cooling the solution at a rate in a range of 0.05° C./min to 5° C./min, wherein cooling occurs at least until a third temperature is reached at which third temperature turbidity does not further increase, and separating the particles formed during step b) or c) from the solution.

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