IP Library › Granted Patent US 8,067,091
Granted Patent B2
US 8,067,091 · App. 11/613,233 · Granted Nov 29, 2011

Dimensionally stable, leak-free graphite substrate

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Quick Facts
Patent No.
US 8,067,091
App. No.
11/613,233
Filed
Dec 20, 2006
Granted
Nov 29, 2011
Kind
B2
Art Unit
1783
USPC
428/408
Abstract

A method for preparing resin-impregnated graphite articles, including providing a sheet of compressed particles of exfoliated graphite having two major surfaces; impregnating the sheet with a first resin system to form a resin-impregnated sheet; surface treating the resin-impregnated sheet to form at least one structure on at least one of the major surfaces of the sheet to form a surface treated sheet; and treating the sheet with a second resin system.

Claims (15)

1. A method for preparing resin-impregnated graphite articles, comprising:

a. providing a sheet of compressed particles of exfoliated graphite having two major surfaces;

b. impregnating the sheet with a first resin to form a resin-impregnated sheet;

c. surface treating the resin-impregnated sheet to form at least one structure on at least one of the major surfaces of the sheet to form a surface treated sheet; and

d. treating the surface-treated sheet with a second resin.

2. The method of claim 1 , wherein the first resin comprises a thermosetting resin impregnated into the sheet at a level of about 5% to about 35% by weight.

3. The method of claim 2 , wherein the first resin comprises a resin selected from the group consisting of a polybenzoxazine resin, an epoxy resin and combinations thereof.

4. The method of claim 2 , wherein the first resin is at least partially cured prior to surface treating of the resin-impregnated sheet.

5. The method of claim 4 , wherein surface treating of the resin-impregnated sheet comprises embossing a channel along the surface of the resin-impregnated sheet.

6. The method of claim 1 , wherein the second resin is applied to the surface treated sheet at a level of about 0.1% to about 9% by weight.

7. The method of claim 6 , wherein the second resin comprises a methacrylate resin.

8. The method of claim 6 , wherein the second resin comprises a dye.

9. The method of claim 7 , wherein the methacrylate resin is applied to the surface treated sheet at a level of about 0.2% and about 6% by weight.

10. The method of claim 7 , wherein the second resin further comprises a free radical initiator.

11. The method of claim 10 , wherein the free radical initiator comprises a substituted azonitrile compound.