公开(公告)号：US20230040771A1

公开(公告)日：2023-02-09

申请号：US17787919

申请日：2019-12-20

Applicant: RHODIA OPERATIONS

Inventor： David James Wilson ,  Alexander Lerch ,  Fan Jiang ,  Bing Hong ,  Stephane Streiff

IPC: C08J11/16

Abstract: The instant invention concerns a process for fragmenting a polymer chain, comprising an oxidative degradation step wherein the polymer chain is contacted with a reduced form of a metal M and an oxidant such as dioxygen, and wherein the polymer carries covalently bound chemical groups acting as a ligand of said reduced form of the metal M.
The invention also relates to methods making use of this fragmentation process as a first step of a degradation process of the polymer especially useful for avoiding the negative impact of a polymer to the environment. In this connection, the invention relates to the use of polymers carrying chemical groups acting as a ligand for a reduced form of a metal M, as a polymer biodegradable in an environment wherein the reduced form of a metal M is present.

公开(公告)号：US11441105B2

公开(公告)日：2022-09-13

申请号：US16771520

申请日：2017-12-15

Applicant: RHODIA OPERATIONS

Inventor： Bing Hong ,  Alexander Lerch ,  Stéphane Streiff ,  Peng Fei Ji ,  Armin T. Liebens

IPC: C11D1/00 ,  C11D3/20 ,  C11D3/28 ,  C11D3/39 ,  C11D3/395 ,  C11D11/00 ,  C11D17/04 ,  C11D3/34

Abstract: Provided is the use of a lanthanide metal complex as a bleaching catalyst. In particular, the lanthanide metal complex comprises a ligand which is an aromatic compound having at least one electron withdrawing substituent and at least one nucleophilic group. Provided is also a composition containing the lanthanide metal complex.