Invention Grant
- Patent Title: Selective alkylation method for producing p, p′-di-alkylated diphenylamine antioxidants
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Application No.: US14754383Application Date: 2015-06-29
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Publication No.: US09890346B2Publication Date: 2018-02-13
- Inventor: Robert G Rowland
- Applicant: Chemtura Corporation
- Applicant Address: US CT Middlebury
- Assignee: LANXESS Solutions US Inc.
- Current Assignee: LANXESS Solutions US Inc.
- Current Assignee Address: US CT Middlebury
- Agency: Dilworth IP LLC
- Main IPC: C10M133/12
- IPC: C10M133/12 ; C07C209/68 ; C10M177/00 ; C07C211/55
Abstract:
Liquid diphenylamine compositions comprising predominately p,p′-di-alkylated diphenylamines and low amounts of mono-alkylated diphenylamines are prepared by adding an olefin to a mixture comprising mono-alkylated diphenylamines, di-alkylated diphenylamines, Lewis acid catalyst and an amount of another olefin sufficient to suppress dealkylation of the alkylated diphenylamines.
Public/Granted literature
- US20160017252A1 Selective Alkylation Method for Producing p, p'-Di-alkylated Diphenylamine Antioxidants Public/Granted day:2016-01-21
Information query
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