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公开(公告)号：US11591448B2
公开(公告)日：2023-02-28
申请号：US17177489
申请日：2021-02-17
发明人： Wilfried Knott , Horst Dudzik , Dietmar Schaefer
IPC分类号： C08J11/26
摘要： The method for the physical reutilization of sheet-like siliconized structures comprises treating the sheet-like siliconized structure in a liquid digestion system comprising acetic anhydride and/or an acetoxysiloxane, and at least one Brønsted acid, optionally solvent, preferably with addition of acetic acid, and removing the desiliconized sheet-like structure from the liquid phase.
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公开(公告)号：US20200377686A1
公开(公告)日：2020-12-03
申请号：US16849181
申请日：2020-04-15
发明人： Wilfried Knott , Horst Dudzik , Dietmar Schaefer
IPC分类号： C08J11/26
摘要： A process for the recycling of silicones, especially silicone rubber and/or silicone oils, by the chemical transformation thereof to silanes and/or siloxanes having acetoxy groups is described, wherein silicone rubber and/or silicone oils are subjected to a heat treatment in digestion systems comprising acetic anhydride and/or acetoxysiloxane, and at least one Brønsted acid, with addition of acetic acid.
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公开(公告)号：US20220119617A1
公开(公告)日：2022-04-21
申请号：US17476417
申请日：2021-09-15
发明人： Wilfried Knott , Horst Dudzik , Dietmar Schaefer
IPC分类号： C08J11/12
摘要： Upcycling process for producing acidic, end-equilibrated siloxanes bearing acetoxy groups and having chain lengths of greater than 3 silicon atoms from end-of-life silicones by thermal digestion in an acidic reaction medium comprising acetic anhydride, acetic acid and at least one further Brønsted acid having a pKa of
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公开(公告)号：US11286366B2
公开(公告)日：2022-03-29
申请号：US16849181
申请日：2020-04-15
发明人： Wilfried Knott , Horst Dudzik , Dietmar Schaefer
IPC分类号： C08J11/26
摘要： A process for the recycling of silicones, especially silicone rubber and/or silicone oils, by the chemical transformation thereof to silanes and/or siloxanes having acetoxy groups is described, wherein silicone rubber and/or silicone oils are subjected to a heat treatment in digestion systems comprising acetic anhydride and/or acetoxysiloxane, and at least one Brønsted acid, with addition of acetic acid.
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公开(公告)号：US11732092B2
公开(公告)日：2023-08-22
申请号：US17476417
申请日：2021-09-15
发明人： Wilfried Knott , Horst Dudzik , Dietmar Schaefer
CPC分类号： C08G77/46 , C08G77/14 , C08J11/12 , C08J11/26 , C08J2383/04 , C08J2383/06
摘要： Upcycling process for producing acidic, end-equilibrated siloxanes bearing acetoxy groups and having chain lengths of greater than 3 silicon atoms from end-of-life silicones by thermal digestion in an acidic reaction medium comprising acetic anhydride, acetic acid and at least one further Brønsted acid having a pKa of
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公开(公告)号：US20210301099A1
公开(公告)日：2021-09-30
申请号：US17177489
申请日：2021-02-17
发明人： Wilfried Knott , Horst Dudzik , Dietmar Schaefer
IPC分类号： C08J11/26
摘要： The method for the physical reutilization of sheet-like siliconized structures comprises treating the sheet-like siliconized structure in a liquid digestion system comprising acetic anhydride and/or an acetoxysiloxane, and at least one Brøonsted acid, optionally solvent, preferably with addition of acetic acid, and removing the desiliconized sheet-like structure from the liquid phase.
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