Poly(imide-amic ester), process for preparing the same, and processes for preparing polyimide film and polyimide fiber from the same
AssigneeKorea Research Institute of Chemical Technology
InventorsSuh Bong Rhee, Myong Hoon Lee, Ji Woong Park
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Abstract
A poly(imide amic ester) having repeating unit of formula (I) and a process for the preparation thereof are provided, wherein formula (I) has the structure ##STR1## wherein Ar is, ##STR2## Ar' is, ##STR3## Ar" is ##STR4## R is selected from the group consisting of CH.sub.3, CH.sub.2 CH.sub.3, CH(CH.sub.3).sub.2, CH.sub.2 CH.sub.2 CH.sub.3, CH.sub.2 (CH(CH.sub.3).sub.2 and C(CH.sub.3).sub.3. Further, processes for the preparation of polyimide, polyimide film and polyimide fiber using the above poly(imide amic ester) are provided.
Claims23
A poly(imide amic ester) having repeating unit of formula:
- ##STR26## wherein Ar is ##STR27## Ar' is ##STR28## Ar" is ##STR29## R represents C.sub.1-4 alkyl, such as CH.sub.3, CH.sub.2 CH.sub.3, CH(CH.sub.3).sub.2, CH.sub.2 CH.sub.2 CH.sub.3, CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.3, CH.sub.2 CH(CH.sub.3).sub.2 and C(CH.sub.3).sub.3.
A process for preparing polyimide having repeating units of formula:
- ##STR33## wherein Ar is ##STR34## Ar' is ##STR35## Ar" is ##STR36## R is a C.sub.1-4 alkyl, selected from the group consisting of CH.sub.3, CH.sub.2 CH.sub.3, CH(CH.sub.3).sub.2, CH.sub.2 CH.sub.2 CH.sub.3, CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.3, CH.sub.2 CH(CH.sub.3).sub.2 and C(CH.sub.3).sub.3, said process comprising:
- providing a solution of poly(imide amic ester) having repeating units of formula (I) in an organic solvent;
- wherein formula (I) is ##STR37## wherein Ar, Ar', Ar" and R are the same as defined above;
- and subjecting the resulting poly(imide amic ester) solution to thermal imidation by heating at a temperature of above 240.degree. C.
A process for preparing a film of polyimide having repeating units of formula:
- ##STR38## wherein Ar is ##STR39## Ar' is ##STR40## Ar" is ##STR41## R is a C.sub.1-4 alkyl, selected from the group consisting of CH.sub.3, CH.sub.2 CH.sub.3, CH(CH.sub.3).sub.2, CH.sub.2 CH.sub.2 CH.sub.3, CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.3, CH.sub.2 CH(CH.sub.3).sub.2 and C(CH.sub.3).sub.3, said process comprising:
- providing a solution of poly(imide amic ester) having repeating units of formula (I) in an organic solvent;
- wherein formula (I) is ##STR42## wherein Ar, Ar', Ar" and R are the same as defined above;
- casting or coating the resulting solution on a solid support;
- drying the resulting film or coat at a temperature of 20.degree. to 150.degree. C. to give a poly(imide amic ester) film or coat;
- and
- subjecting the resulting poly(imide amic ester) film or coat to thermal imidation by heating at a temperature of above 240.degree. C.
A process for preparing a fiber of polyimide having repeating units of formula:
- ##STR43## wherein Ar is ##STR44## Ar' is ##STR45## Ar" is ##STR46## R is a C.sub.1-4 alkyl, selected from the group consisting of CH.sub.3, CH.sub.2 CH.sub.3, CH(CH.sub.3).sub.2, CH.sub.2 CH.sub.2 CH.sub.3, CH.sub.2 CH.sub.2 CH.sub.3 CH.sub.3, CH.sub.2 CH(CH.sub.3).sub.2 and C(CH.sub.3).sub.3, said process comprising:
- dry- or wet-spinning of a solution of poly(imide amic ester) having repeating units of formula (I) in an organic solvent to form a fiber;
- wherein formula (I) is ##STR47## wherein Ar, Ar', Ar" and R are the same as defined above;
- drying the fiber at a temperature of 20.degree. C. to 150.degree. C. or passing through a non-solvent area;
- and
- heating the fiber to a temperature of 240.degree. C. to 450.degree. C. concurrently with or after drawing.
Dependencies are inferred from the claim text.