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706 条记录 (耗时 0.016 秒)

    METHOD FOR TREATING COMPLEX SHEETS
    5.
    发明公开
    METHOD FOR TREATING COMPLEX SHEETS 审中-公开

    公开(公告)号：EP4302957A1

    公开(公告)日：2024-01-10

    申请号：EP22762665.2

    申请日：2022-03-03

    申请人： Riera I Boix, Daniel

    发明人： Riera I Boix, Daniel

    IPC分类号： B29B17/00 ,  C08J11/06

    摘要： Method of treating complex films, comprising at least a first single sheet of a polymer, preferably PET, a second single sheet of a polymer, preferably PE, and at least one layer of adhesive, preferably EVA or acrylic. The sheets are in flake form and are separated by subjecting them to a first stirring bath in hot water with at least one dicarboxylic acid and at least one fatty acid, preferably oxalic acid and oleic acid; plus a second stirring bath with a caustic agent, preferably caustic soda, and a surfactant. The PE and PET films are separated by at least one densifying bath. The PET films are then treated by means of a stirring bath, a drying silo and a foreign particle separation machine. After each bath, except between the two densifying baths, the flakes are passed through a centrifuge.

    METHOD FOR DECOLORING A COLORED PLASTIC ARTICLE HAVING AN OUTERMOST LAYER
    10.
    发明公开
    METHOD FOR DECOLORING A COLORED PLASTIC ARTICLE HAVING AN OUTERMOST LAYER 审中-公开

    公开(公告)号：EP4163325A1

    公开(公告)日：2023-04-12

    申请号：EP21201355.1

    申请日：2021-10-07

    申请人： Smart Coloring GmbH

    发明人： ROBERTZ, Bernd

    IPC分类号： C08J7/04 ,  B29C48/00 ,  C08J7/048 ,  C08J11/06 ,  C08L23/06 ,  D06P1/90 ,  C23C14/00 ,  C23C16/22

    摘要： It is an object of the invention to provide a method for decoloring a colored plastic article, wherein the plastic article comprises at least two layers, wherein a first layer of the at least two layers is an outermost layer and forms a surface of the plastic article; wherein a second layer of the at least two layers is a color layer and comprises a plastic material and a coloring agent; wherein the plastic material comprises at least 0,1 wt.-% of a polar component, based on the weight of the plastic material, wherein the polar component is a polar polymer, a polar compound and/or a blend of polar polymers and/or polar compounds, wherein the polar polymer has a molecular weight Mw ≥ 1000 g/mol and has at least 5 wt.-% of heteroatoms based on the molecular weight of the polar polymer, wherein the polar compound has a molecular weight Mw
    a) shredding the colored plastic article to a granulate and/or a powder,
    b) exposing the granulate and/or powder to a decoloring bath for about ≥ 1 minute to about ≤ 240 minutes, wherein the decoloring bath has a temperature above a glass transition temperature T g of the colored plastic article and below a melting temperature T m and/or decomposition temperature of the colored plastic article and/or has a temperature ≥ 60 °C to ≤ 130°C,
    wherein the decoloring bath comprises
    - water,
    - at least one polar solvent and/or at least one non-polar solvent, and
    - an oxidizing agent or a reducing agent and/or a polar decoloring agent,
    wherein the decoloring bath has a pH about ≥ 8, and wherein the pH of the decoloring bath is adjusted by adding a base, preferably NaOH or
    wherein the decoloring bath has a pH about ≤ 6, and wherein the pH of the decoloring bath is adjusted by adding an acid, preferably HCl.