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公开(公告)号：US11999686B2
公开(公告)日：2024-06-04
申请号：US17419063
申请日：2020-01-07
发明人： Norbert Niessner , Bianca Wilhelmus , Hannes Kerschbaumer , Michiel Verswyvel , Petra Inghelbrecht , Thomas W. Cochran , KyungHo Shon , Mohammed Abboud , Ricardo Cuetos , Hans-Dieter Schwaben , Jens Kathmann , Thad Urquhart , Timothy A. Brown , Tim Wong , Walter De Vet , Hans-Werner Schmidt , Andreas Schedl , Tristan Kolb
CPC分类号： C07C4/22 , B01D3/143 , B01D3/4227 , C07C7/04 , C08J11/12 , C10B53/07 , C08J2325/06
摘要： The invention relates to an improved process for providing purified styrenic monomers, such as styrene, from styrene-containing polymer waste. Styrene-containing waste is depolymerized in a suitable reactor, and the depolymerization products are condensed and separated in a three-step distillation process.
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公开(公告)号：US11193019B2
公开(公告)日：2021-12-07
申请号：US16330581
申请日：2017-09-07
IPC分类号： C08L77/02 , C08L55/02 , B33Y10/00 , B33Y70/00 , B33Y40/10 , B29C64/314 , B29C64/153 , B29K101/12
摘要： The present invention relates to a thermoplastic polymer powder and to the use thereof as material for selective laser sintering (SLS). The polymer powder contains a partially crystalline polymer, an amorphous polymer and a compatibilizing agent, and optionally additional additives and/or auxiliary substances, wherein the partially crystalline polymer, the amorphous polymer and the compatibilizing agent are in the form of a polymer blend. The invention also relates to a method for producing the thermoplastic polymer powder and to a method of selective laser sintering (SLS).
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公开(公告)号：US12116337B2
公开(公告)日：2024-10-15
申请号：US17641474
申请日：2020-09-17
发明人： Norbert Niessner , Bianca Wilhelmus , Achim Schmidt-Rodenkirchen , Konstantin Mierdel , Frank Neuner
CPC分类号： C07C4/22 , C08J11/12 , C07C2527/224 , C08J2325/06
摘要： The invention relates to a process for the preparation of styrene monomers by depolymerising polystyrene, to a device for carrying out the process and to the use of a fluidised bed reactor for the depolymerisation of polystyrene. Said process comprising the following steps: a) feeding a polymer composition (A) containing 60 to 99.9 wt. polystyrene, based on the total weight of the polymer composition (A), into the reaction zone (R) of a pyrolysis reactor (P); b) thermally cracking the polystyrene contained in the polymer composition (A) in the reaction zone (R) of the pyrolysis reactor (P) at a temperature of between 400° C. to 1000° C. to obtain a product mixture (G) containing styrene monomers and other components; c) removing the product mixture (G) obtained in step b) from the reaction zone (R) of the pyrolysis reactor (P); d) cooling the product mixture (G) removed in step c) to obtain a condensed product mixture (K) containing styrene monomers and further components; and e) separating the styrene monomers from the further components of the condensed product mixture (K) obtained in step d), wherein the average residence time (Z) of the polymer composition (A) in the reaction zone (R) of the pyrolysis reactor (P) is from 0.01 sec to 10 sec.
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公开(公告)号：US11225570B2
公开(公告)日：2022-01-18
申请号：US16627548
申请日：2018-07-03
发明人： Tobias Schulz , Felix Rattay , Bianca Wilhelmus
摘要： Thermoplastic resin composition comprising: (a1) at least one styrene-acrylonitrile copolymer component A1, (a2) at least one acrylonitrile styrene acrylate graft copolymer A2 as impact modifier, (a3) optionally at least one thermoplastic polymer A3 other than components A1 and A2, (b) at least one pigment B, (c) at least one hindered amine UV light stabilizer C1 and at least one UV absorber C2 different from C1, and (d) optionally further polymer additives D, other than components B, C1, C2, and E, (e) at least one metal scavenger component E.
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