Fast dissolving polyimide powders

Patent metadata

Field	Value
Publication number	US-9469734-B2
Application number	US-201113072559-A
Country	US
Kind code	B2
Filing date	Mar 25, 2011
Priority date	Mar 25, 2011
Publication date	Oct 18, 2016
Grant date	Oct 18, 2016

Abstract

Polyetherimide particles or powders with a high surface area and high porosity can be prepared by precipitation of polymer solution in hot water or steam without the use of any additives. The particles or powders produced rapidly dissolved in organic solvents as well as epoxy matrices.

First claim

What is claimed is:

1. A porous powder comprising at least one polyimide porous particle,
wherein the shape of the particle is a fluffy, non-spherical shape of a size in the range of 75 to 5,000 microns; and
wherein the pore volume of the particle is from greater than or equal to 0.01 to 0.10 cc/g.

2. The porous powder of claim 1 , wherein the pore size of the at least one porous particle is from more than 237 to 1500 Angstroms.

3. The porous powder of claim 1 , wherein the BET Surface area of the at least one porous particle is from more than 2.3 to 10 m2/g.

4. The porous powder of claim 1 , wherein the at least one porous particle (25% wt./wt. concentration) dissolves in epoxy at 120 degrees Celsius in less than 5 hours.

5. The porous powder of claim 1 , wherein the at least one porous particle (25% wt./wt. concentration) dissolves in N-methyl pyrrolidone in less than 2 hours at 80 degrees Celsius.

6. A composition comprising a porous powder of polyetherimide, wherein the powder comprises at least one particle, wherein the particle has a size of from 200-800 microns having a fluffy, non-spherical shape, and wherein the composition dissolves in epoxy in less than 5 hours.

7. The composition according to claim 6 , wherein the particle has an average pore size in the range of more than 237 to 1,500 Angstroms.

8. An article of manufacture comprising a composition according to claim 6 .

9. A porous powder comprising polyimide,
wherein the porous powder comprises at least one particle having a fluffy, non-spherical shape in a size in the range of 75 to 5,000 microns: and
wherein the pore volume of the porous powder is from greater than 0.01 to 0.10 cc/g,
wherein the pore size of the porous powder is from more than 237 to 1500 Angstroms, and
wherein the BET Surface area of the porous powder is from more than 2.3 to 10 m2/g.

10. An article of manufacture comprising a composition according to claim 9 .

11. The porous powder of claim 9 , wherein the polyimide is selected from the group of polyetherimides, siloxane-polyetherimides, polyetherimide sulfones, and combinations thereof.

Assignees

• Kalyanaraman Viswanathan
• Hollar William E
• Sabic Global Technologies Bv

Inventors

• Kalyanaraman Viswanathan
• Hollar William E

Classifications

• C08G73/106

  containing silicon · CPC title

• C08J3/16

  by coagulating dispersions {(C08J3/122 takes precedence)} · CPC title

• C08J2379/08

  Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors · CPC title

• C08L79/085

  Unsaturated polyimide precursors · CPC title

• Y10T428/2982

  Particulate matter [e.g., sphere, flake, etc.] · CPC title