Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1988-07-12
1989-10-31
Lusignan, Michael
Coating processes
With post-treatment of coating or coating material
Heating or drying
26433119, 4284735, 528352, 528353, B05D 302
Patent
active
048776530
ABSTRACT:
A method of insolubilizing solvent soluble polyimides comprising the imidized condensation products of an aromatic dianhydride and a primary aromatic diamine wherein at least one of said dianhydride or diamine is selected from the group consisting of 2,2-hexafluoro-bis(3,4-dicarboxyphenyl)propane dianhydride; 2,2-hexafluoro-bis(3-aminophenyl) propane; 2,2-hexafluoro-bis(4-aminophenyl)propane; 2,2-hexafluoro-bis-[4-(3-aminophenoxy)phenyl]propane; 2,2-hexafluoro-bis[4-(4-aminophenoxy)phenyl]propane; 1,1-bis(4-aminophenyl)-1-phenyl-2,2,2-trifluoroethane; 1,1-bis-[4-(1,2-dicarboxyphenyl)]-1-phenyl-2,2,2-trifluoroethane dianhydride and mixtures thereof.
The method comprises forming a shaped article or film comprising the polyimides and subjecting same to a heat annealing process at a temperature of at least 325.degree. C. and for a period of time sufficient to insolubilize the polyimide. Preferred temperatures range from 350.degree. C. to 400.degree. C. for a period of time of at least 45 minutes to about 2 hours.
REFERENCES:
patent: 3356648 (1967-12-01), Rogers
patent: 4690999 (1987-09-01), Numata et al.
Fontaine Suzanne
Khanna Dinesh N.
Vora Rohitkumar H.
Hoechst Celanese Corporation
Lusignan Michael
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