Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – By casting liquids on a solid supporting or shaping surface
Patent
1983-02-03
1984-09-11
Lowe, James B.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
By casting liquids on a solid supporting or shaping surface
264178R, 264203, 26433112, 26433119, 264344, 4284735, 524104, 524233, 524600, B29D 708
Patent
active
044709447
ABSTRACT:
The present invention relates to a process for producing an of aromatic polyimide film comprising (A) casting on a support a dope containing an amide-type polar solvent and 10-45 weight percent of a polyamic acid having more than 0.4 dl/g an inherent viscosity of more than 0.4 dl/g, (B) concentrating the polymer content to be at least higher than that of the initial dope while simultaneously raising the ring closure ratio above 30%, (C) removing the solvent from the film by extraction in an aqueous medium so as to lower the solvent content of the film below 10% and (D) then heating the film to a temperature of more than 200.degree. C.
The process of the present invention is useful for the production of aromatic polyimide film having a reduced rate of solvent decomposition and improved productivity.
The aromatic polyimide film produced by the process of the present invention is superior in thermal as well as mechanical properties and is highly useful as an electric insulation material and also as a base for flexible printed circuits, magnetic tape, etc.
REFERENCES:
patent: 3179614 (1965-04-01), Edward
patent: 4073837 (1978-02-01), Kouzai
Asakura Toshiyuki
Kobayashi Hiroaki
Mizouchi Masanori
Lowe James B.
McGurk Michael
Miller Austin R.
Toray Industries Inc.
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