- Patent Title: Method for producing amides or polyamides by using aromatic carbamates by way of isocyanates as precursors through catalyzed thermal processes and method for producing aromatic carbamate precursors from aromatic amines
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Application No.: US15653591Application Date: 2017-07-19
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Publication No.: US10450265B2Publication Date: 2019-10-22
- Inventor: Shenghong A. Dai , Ching Hsuan Lin , Jung-Yang Yang
- Applicant: Great Eastern Resins Industrial Co., Ltd.
- Applicant Address: TW Taichung
- Assignee: Great Eastern Resins Industrial Co., Ltd.
- Current Assignee: Great Eastern Resins Industrial Co., Ltd.
- Current Assignee Address: TW Taichung
- Agency: Drinker Biddle & Reath LLP
- Priority: TW105143958A 20161229
- Main IPC: C07C269/04
- IPC: C07C269/04 ; C08G69/00 ; C07C263/04 ; C07C267/00 ; C07C273/18 ; C07C231/10 ; C08G69/04 ; C08G69/26 ; C08G69/28 ; C08G69/32
Abstract:
The present invention is directed to a process for preparing amides or polyamides by replacing isocyanate starting materials of a catalyzed thermal reaction with aromatic carbamates. Through the catalyzed thermal process involving a non-isocyanate precursor of the present invention, efficiency for producing amides or polyamides can be significantly improved, and the impure side products produced from a side reaction of isocyanate can be greatly curtailed. Hence, amides or polyamides of high purity and yield can be achieved. The invention also relates to a process for preparing aromatic carbamates, the new non-isocyanate precursors for amides or polyamides.
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