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    METHOD FOR CLEANING AQUEOUS WASTEWATER STREAMS LOADED WITH NITROBENZENE
    31.
    发明公开
    METHOD FOR CLEANING AQUEOUS WASTEWATER STREAMS LOADED WITH NITROBENZENE 审中-公开

    公开(公告)号：US20230234859A1

    公开(公告)日：2023-07-27

    申请号：US17996954

    申请日：2021-04-24

    Applicant: Covestro Deutschland AG

    Inventor： Thomas Rosin ,  Peter Drinda ,  Klaus Pilarczyk

    IPC: C02F1/00 ,  B01D3/34 ,  B01D3/38 ,  B01D3/42 ,  C02F1/10 ,  B01D3/26

    CPC classification number: C02F1/008 ,  B01D3/346 ,  B01D3/38 ,  B01D3/42 ,  C02F1/10 ,  B01D3/26 ,  C02F2101/38

    Abstract: The present invention relates to a process for purifying a wastewater stream WW1 contaminated with nitrobenzene, comprising (I) stripping of the wastewater stream WW1 with a stripping gas SG1 in a continuously operated stripping column to obtain a wastewater stream WW2 which contains nitrobenzene in a concentration reduced relative to WW1 (cNB,WW2), (II) further purification of the wastewater stream WW2 in a wastewater treatment plant, wherein a target value (cNB,WW2,TARGET) is specified for the concentration of nitrobenzene in the wastewater stream WW2, which is greater than zero but takes into account the requirements of the wastewater treatment plant for the maximum content of nitrobenzene in the wastewater streams supplied thereto, wherein, for at least one combination of specified boundary conditions of (a) nitrobenzene concentration in WW1, (b) the temperature of WW1, and (c) the temperature of SG1, a set of linear mathematical relationships of the type mSG1=x·mWW1 is stored in a database, which linear mathematical relationships define a range of concentrations of nitrobenzene in WW2, wherein the set comprises, in addition to a mathematical relationship (0) which corresponds to the target value cNB,WW2,TARGET, at least a first mathematical relationship (1) for a first value of cNB,WW2, which corresponds to 98% of the target value cNB,WW2,TARGET, and a second linear mathematical relationship (2) for a second value of cNB,WW2, which corresponds to 102% of the target value cNB,WW2,TARGET, and wherein the flow rate of the stripping gas is adapted to the flow rate of the wastewater WW1 such that the flow rate of WW1 is within a range of values (AB) that is generated by the first mathematical relationship (1) and the second mathematical relationship (2) at the respective flow rate of WW1, and controlling the concentration of nitrobenzene in WW2 (cNB,WW2) by adjusting the flow rate of stripping gas SG1 accordingly in the event of a measured actual value of this concentration which is outside a window of >98% to

    FLAME-RETARDANT POLYCARBONATE COMPOSITION
    33.
    发明公开
    FLAME-RETARDANT POLYCARBONATE COMPOSITION 审中-公开

    公开(公告)号：US20230212389A1

    公开(公告)日：2023-07-06

    申请号：US17996355

    申请日：2021-05-05

    Applicant: Covestro Deutschland AG

    Inventor： Qing Guo ,  Hao Han ,  Shoujun Li ,  Zhenyu Huang

    IPC: C08L69/00 ,  C08L33/12 ,  C08L85/02 ,  C08K7/14 ,  C08L27/18

    CPC classification number: C08L69/00 ,  C08L33/12 ,  C08L85/02 ,  C08K7/14 ,  C08L27/18 ,  C08L2201/02

    Abstract: The present invention relates to a flame-retardant polycarbonate composition comprising the following components:
    A) 50-90 parts by weight of aromatic polycarbonate,

    B) 3-20 parts by weight of non-core-shell impact modifier,

    C) 2-15 parts by weight of at least one cyclic phosphazene of formula (V):





    where

    k is an integer from 1 to 10, the trimer content (k=1) being more than 98 mol %, based on component C, and where

    R are in each case identical or different and are an amine radical, C1-C8-alkyl in each case optionally halogenated, C1-C8-alkoxy, C5-C6-cycloalkyl in each case optionally substituted by alkyl and/or halogen, C6-C20-aryloxy in each case optionally substituted by alkyl and/or halogen, and/or hydroxyl, C7-C12-aralkyl in each case optionally substituted by alkyl and/or halogen, a halogen radical, or an OH radical,

    D) 0-30 parts by weight of filler,

    E) 0.05-5 parts by weight of antidripping agent; and

    F) 0-15 parts by weight of additional additives,

    the total weight of the composition is 100 parts by weight,

    preferably, the composition consists to at least 90 wt. %, more preferably at least 95 wt. %, most preferably 100 wt % of components A-F, relative to the total weight of the composition.

    The present invention also relates to a shaped article produced from the composition. The polycarbonate composition according to the present invention has a good combination of flame retardancy, hydrolytic stability and impact resistance, meanwhile there is no feeding issue during its production.

    POLYETHER-MODIFIED POLYISOCYANATE COMPOSITION
    36.
    发明公开
    POLYETHER-MODIFIED POLYISOCYANATE COMPOSITION 审中-公开

    公开(公告)号：US20230192937A1

    公开(公告)日：2023-06-22

    申请号：US18009039

    申请日：2021-06-28

    Applicant: Covestro Deutschland AG

    Inventor： Hans-Josef Laas ,  Raul Pires ,  Hao Liu ,  Yaguang Ma ,  Jianping Shen ,  Junchao Zheng

    IPC: C08G18/28 ,  C09D175/08

    CPC classification number: C08G18/283 ,  C09D175/08 ,  C08G2150/00 ,  C08G2170/00 ,  C08G2190/00

    Abstract: The present invention relates to a polyether-modified polyisocyanate composition, which is obtainable by reacting a system containing the following components: a) a polyisocyanate having an isocyanate group functionality of 2-4.5; b) a polyoxyalkylene monoether alcohol; and c) optionally a catalyst; the polyoxyalkylene monoether alcohol has a number-average molecular weight of 900 g/mol-2000 g/mol and an oxypropylene group content of 45 wt. %-100 wt. %, relative to the total weight of the oxyalkylene group of the polyoxyalkylene monoether alcohol; the system has an equivalent ratio of isocyanate group to hydroxyl group of 5:1-110:1; the polyisocyanate composition has the following characteristics: i) the average isocyanate functionality is 1.8-4.1; ii) the isocyanate group content is 8-20 wt. %; and iii) the amount of the polyoxyalkylene monoether structure is greater than 10 wt. % and less than 50 wt. %, for characteristics ii) and iii), relative to the total weight of the polyisocyanate composition.

    Polyester Carbonates Having a Defined Proportion of Ester Groups
    37.
    发明公开
    Polyester Carbonates Having a Defined Proportion of Ester Groups 审中-公开

    公开(公告)号：US20230167235A1

    公开(公告)日：2023-06-01

    申请号：US17919120

    申请日：2021-06-11

    Applicant: Covestro Deutschland AG

    Inventor： Alexander Meyer ,  Lukas Fabian Schulz ,  Thomas Pfingst

    IPC: C08G63/64

    CPC classification number: C08G63/64

    Abstract: The present invention relates to a process for preparing a polyester carbonate on the basis of diacids and at least one 1,4:3,6-dianhydrohexitol and at least one additional cycloaliphatic dihydroxy compound, to a polyester carbonate and to a molding compound and a molding body containing the polyester carbonate. The polyester carbonates according to the invention are characterized by a high proportion of bio-based structural motifs and good mechanical properties and molecular weights.

    FLAME-RETARDANT POLYCARBONATE COMPOSITION
    40.
    发明申请
    FLAME-RETARDANT POLYCARBONATE COMPOSITION 有权

    公开(公告)号：US20230125361A1

    公开(公告)日：2023-04-27

    申请号：US17997748

    申请日：2021-05-14

    Applicant: Covestro Deutschland AG

    Inventor： Zhenyu Huang ,  Hao Han

    IPC: C08G64/04 ,  C08G64/18 ,  C08K5/5399 ,  C08F265/06 ,  C08F220/14 ,  C08F220/18 ,  C08F230/08 ,  C08K3/34 ,  C08F14/26

    Abstract: The present invention relates to a flame-retardant polycarbonate composition comprising the following components, relative to the total weight of the composition: A) 30-70 wt. % of at least one aromatic polycarbonate, B) 20-60 wt. % of at least one polysiloxane-polycarbonate block condensate, C) 0.5-5 wt. % of at least one cyclic phosphazene, D) 1-5 wt. % of at least one silicone-acrylate rubber based impact modifier, E) 0.3-3 wt % of kaolin, F) 0.1-1 wt. % of at least one anti-dripping agent, and G) 0.1-1 wt. % of at least one UV absorber. The present invention also relates to a shaped article produced from the composition. The polycarbonate composition according to the present invention has a good combination of low-temperature impact performance, flame-retardancy, hydrolytic stability, anti-UV performance, and heat resistance.

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