Aromatic polyimides suitable for 3d printing processes

Abstract

Novel aromatic polyimides are disclosed with sufficient physical properties to be useful in 3D printing.

What is claimed is: 
     
         1 - 20 . (canceled) 
     
     
         21 . An aromatic polyimide selected from the group consisting of:
 (a) the reaction product of
 (1) 3, 4′-oxydianiline (3,4′ ODA); 
 (2) 2,3,3′,4′-biphenyldianhydride (a-BPDA); and 
 (3) phthalic anhydride in a molar ratio of 1.0:0.975-0.985:0.03-0.05; 
   (b) the reaction product of
 (1) 3, 4′-oxydianiline (3,4′ ODA); 
 (2) 1,3-Bis(4-aminophenoxy)benzene (1,3,4′-APB) having CAS No. 2479-46-1; 
 (3) 2,3,3′,4′-biphenyldianhydride (a-BPDA); and 
 (4) phthalic anhydride in a molar ratio of 0.9:0.1:0.975-0.98:0.04-0.05; 
   (c) the reaction product of
 (1) 3, 4′-oxydianiline (3,4′ ODA); 
 (2) 2,2-Bis(4-[4-aminophenoxy]phenyl)propane (BAPP); 
 (3) 2,3,3′,4′-biphenyldianhydride (a-BPDA); and 
 (4) phthalic anhydride in a molar ratio of 0.9:0.1:0.975:0.05; and combinations thereof 
 wherein each reaction product is in a shape of a filament sufficiently ductile to form a loop of about 64 cm in circumference. 
   
     
     
         22 . The aromatic polyimide of  claim 21  in the shape of the filament, wherein each reaction product (a), (b), and (c) has a glass transition temperature of more than 220° C. and ductility to be wound in the shape of the filament of about 2 mm diameter around a spool having a diameter of 8 inches (20.32 cm). 
     
     
         23 . The aromatic polyimide of  claim 22  in the shape of the filament, wherein the polyimide has a glass transition temperature ranging from about 260 to about 275° C. 
     
     
         24 . The aromatic polyimide of  claim 22  in the shape of the filament, wherein the polyimide has a glass transition temperature ranging from about 265 to about 270° C. 
     
     
         25 . The aromatic polyimide of  claim 22  in the shape of the filament, wherein the aromatic polyimide is sufficiently ductile in a length of about 38 cm to be bent upon itself, such that opposing ends of that length of filament can touch each other. 
     
     
         26 . The aromatic polyimide of  claim 25  in the shape of the filament, wherein the filament has a diameter ranging from about 1.6 to about 2.1 mm. 
     
     
         27 . The aromatic polyimide of  claim 22  in the shape of the filament, wherein the aromatic polyimide is prepared by solvent-less reactive extrusion. 
     
     
         28 . The aromatic polyimide of  claim 27  in the shape of the filament, wherein the aromatic polyimide is prepared by concurrent solvent-less reactive extrusion. 
     
     
         29 . A composite in the shape of the filament comprising the aromatic polyimide of  claim 22 . 
     
     
         30 . The composite in the shape of the filament of  claim 29 , wherein the composite further includes carbon, glass, or synthetic fibers. 
     
     
         31 . The composite in the shape of the filament of  claim 30 , wherein the composite is further in the form of a 3D printed article. 
     
     
         32 . The aromatic polyimide of  claim 21  in the shape of the filament, wherein the polyimide has a glass transition temperature ranging from about 260 to about 275° C. 
     
     
         33 . The aromatic polyimide of  claim 21  in the shape of the filament, wherein each aromatic polyimide reaction product is sufficiently ductile in a length of about 38 cm to be bent upon itself, such that opposing ends of that length of filament can touch each other. 
     
     
         34 . A composite in the shape of the filament comprising the aromatic polyimide of  claim 21 .