Aromatic polyimides suitable for 3D printing processes

Patent metadata

Field	Value
Publication number	US-10240000-B2
Application number	US-201415024838-A
Country	US
Kind code	B2
Filing date	Sep 24, 2014
Priority date	Sep 26, 2013
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

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

First claim

What is claimed is:

1. An aromatic polyimide which is a
reaction product of
(1) 3,4′-oxydianiline (3,4′ ODA);
(2) 4,4′-[1,3-phenylenebis(1-methyl-ethylidene)bisaniline (Bisaniline-M);
(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;

wherein the reaction product is in a shape of a filament sufficiently ductile to form a loop of about 64 cm in circumference.

2. The aromatic polyimide of claim 1 in the shape of the filament, wherein the aromatic polyimide 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).

3. The aromatic polyimide of claim 2 in the shape of the filament, wherein the polyimide has a glass transition temperature ranging from about 260 to about 275° C.

4. The aromatic polyimide of claim 2 in the shape of the filament, wherein the polyimide has a glass transition temperature ranging from about 265 to about 270° C.

5. The aromatic polyimide of claim 2 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.

6. The aromatic polyimide of claim 5 , in the shape of the filament wherein the filament has a diameter ranging from about 1.6 to about 2.1 mm.

7. The aromatic polyimide of claim 2 in the shape of the filament, wherein the aromatic polyimide is prepared by solvent-less reactive extrusion.

8. The aromatic polyimide of claim 7 in the shape of the filament, wherein the aromatic polyimide is prepared by concurrent solvent-less reactive extrusion.

9. The aromatic polyimide of claim 1 in the shape of the filament, wherein the polyimide has a glass transition temperature ranging from about 260 to about 275° C.

10. The aromatic polyimide of claim 1 in the shape of the filament, wherein the 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.

11. A composite in the shape of the filament comprising the aromatic polyimide of claim 1 .

12. A composite in the shape of the filament comprising the aromatic polyimide of claim 2 .

13. The composite of claim 12 , wherein the composite in the shape of the filament further includes carbon, glass, or synthetic fibers.

14. The composite in the shape of the filament of claim 13 , wherein the composite is further in the form of a 3D printed article.

Assignees

• Polyone Corp
• Nasa
• The Unted States Of America As Represented By The Administrator Of The Nat Aeronautics And Space Adm

Inventors

• Avakian Roger W
• Hu Ling
• Chuang Chun-Hua

Classifications

• B29C64/314

  Preparation · CPC title

• C08G73/1014

  in the form of (mono)anhydrid · CPC title

• B29C48/286

  Raw material dosing · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• B29C48/022

  characterised by the choice of material · CPC title