发明授权
- 专利标题: Process for producing aromatic polyamide film
- 专利标题(中): 制备芳香族聚酰胺薄膜的方法
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申请号: US496878申请日: 1995-06-30
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公开(公告)号: US5587450A公开(公告)日: 1996-12-24
- 发明人: Kazunori Akiyoshi , Masahiro Niwano
- 申请人: Kazunori Akiyoshi , Masahiro Niwano
- 申请人地址: JPX Osaka
- 专利权人: Sumitomo Chemical Company, Limited
- 当前专利权人: Sumitomo Chemical Company, Limited
- 当前专利权人地址: JPX Osaka
- 优先权: JPX6-157399 19940708
- 主分类号: C08G69/32
- IPC分类号: C08G69/32 ; C08J5/18 ; G02B1/10 ; H05K1/03 ; H05K3/02 ; C08G69/08 ; C08G73/10
摘要:
A process for producing an aromatic polyamide film, which comprises the steps of: (a) forming a thin layer of an optically isotropic dope in which an aromatic polyamide is dissolved in a polar amide, (b) immersing the thin layer dope of aromatic polyamide in a polar solvent, other than said polar amide, kept at a temperature not higher than -20.degree. C. to prepare a film, and (c) drying the film. The aromatic polyamide film thus obtained is excellent in transparency. Said process requires neither a step of dissolving an aromatic polyamide in conc. sulfuric acid nor an acid-resistant equipment, and hence, is inexpensive.
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