IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0867520
(2007-10-04)
|
등록번호 |
US-8309645
(2012-11-13)
|
발명자
/ 주소 |
- Swei, Gwo S.
- Rushkin, Ilya L.
- Czubarow, Pawel
- House, David Worth
- DeCoster, David
- Guiselin, Olivier
|
출원인 / 주소 |
- Saint-Gobain Performance Plastics Corporation
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
9 |
초록
▼
A composite material includes a polyimide matrix material and an exfoliated graphite material dispersed within the polyimide matrix material. The composite material exhibits a Thermal Stability Index of at least about 20 and has a particle distribution in which 90% of the particles have a particle s
A composite material includes a polyimide matrix material and an exfoliated graphite material dispersed within the polyimide matrix material. The composite material exhibits a Thermal Stability Index of at least about 20 and has a particle distribution in which 90% of the particles have a particle size not greater than 500 micrometers.
대표청구항
▼
1. A composite material comprising: a polyimide matrix material;0.1 wt % to 5.0 wt % of a metal oxide dispersed in the polyimide matrix material, the metal oxide including an element selected from the group consisting of antimony, boron, phosphorous, and any combination thereof; andan exfoliated gra
1. A composite material comprising: a polyimide matrix material;0.1 wt % to 5.0 wt % of a metal oxide dispersed in the polyimide matrix material, the metal oxide including an element selected from the group consisting of antimony, boron, phosphorous, and any combination thereof; andan exfoliated graphite material dispersed within the polyimide matrix material;wherein the composite material exhibits a Thermal Stability Index of at least about 20; wherein the composite material has a particle distribution in which 90% of the particles have a particle size not greater than 500 micrometers. 2. The composite material of claim 1, wherein the Thermal Stability Index is at least about 30. 3. The composite material of claim 1, wherein the exfoliated graphite material is included in a range of about 5 wt % to about 75 wt %. 4. The composite material of claim 1, wherein the polyimide matrix material is a hot compression moldable polyimide powder. 5. The composite material of claim 1, wherein the polyimide matrix material is a direct formable polyimide powder. 6. The composite material of claim 1, wherein the polyimide matrix material is formed from PMDA and ODA. 7. The composite material of claim 1, wherein the polyimide matrix material is formed from BPDA and at least two diamines. 8. The composite material of claim 7, wherein the at least two diamines include ODA and PPD. 9. The composite material of claim 7, wherein the at least two diamines include MPD and PPD. 10. The composite material of claim 1, further comprising a metal oxide. 11. The composite material of claim 1, wherein the exfoliated graphite material includes untreated exfoliated graphite. 12. The composite material of claim 1, wherein the exfoliated graphite material includes treated exfoliated graphite. 13. The composite material of claim 12, wherein the treated exfoliated graphite material includes oxidized exfoliated graphite material. 14. A composite material comprising: a polyimide matrix material0.1 wt % to 5.0 wt % of a metal oxide dispersed in the polyimide matrix material, the metal oxide including an element selected from the group consisting of antimony, boron, phosphorous, and any combination thereof; and5 wt % to 75 wt % of an exfoliated graphite material dispersed in the polyimide matrix material;wherein the composite material exhibits a Thermal Stability Index of at least 20;wherein the composite material is a direct formable powder having a particle distribution in which 90% of the particles have a particle size not greater than 500 micrometers. 15. A method of forming a composite powder, the method comprising: providing exfoliated graphite material and polyamic acid in a solution including at least two solvents;dispersing a metal oxide particulate in the solution; andimidizing the polyamic acid to form a polymeric material comprising a polyimide material matrix including the exfoliated graphite material dispersed therein, the polymeric material exhibiting a Thermal Stability Index of at least 20. 16. The method of claim 15, wherein imidizing includes heating the solution to at least about 100° C. 17. The method of claim 15, further comprising washing the polymeric material with a washing solvent. 18. The method of claim 15, further comprising drying the polymeric material. 19. The method of claim 15, wherein the at least two solvents include a high polarity solvent and a low polarity solvent. 20. The method of claim 19, wherein a ratio of the amount of the high polarity solvent to the low polarity solvent in the solution is between 3.5:1 and 4:1. 21. The method of claim 19, wherein the high polarity solvent is selected from the group consisting of N-methylpyrrolidone (NMP), N,N′-dimethylformamide (DMF), and N,N′-dimethylacetamide (DMAC). 22. The method of claim 19, wherein the low polarity solvent is selected from the group consisting of toluene, xylene, ethyl acetate, and t-butyl methyl ether. 23. The method of claim 15, wherein providing the exfoliated graphite powder and the polyamic acid in the solution including the at least two solvents comprises: dispersing an exfoliated graphite material in a solution comprising a diamine; andadding a dianhydride to the solution comprising the diamine and the exfoliated graphite material, resulting in the polyamic acid. 24. The composite material of claim 1, wherein the Thermal Stability Index is at least 40. 25. The composite material of claim 24, wherein the Thermal Stability Index is at least 45. 26. The composite material of claim 1, wherein the polyimide matrix is the reactive product of biphenyltetracarboxylic acid dianhydride (BPDA) and diamines m-phenylene diamine (MPD) and p-phenylene diamine (PPD), and wherein the Thermal Stability Index is at least 45.
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