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US 8,795,799 B2Granted
Polyimide resins for high temperature applications
AssigneeE. I. Du Pont de Nemours and Company
InventorsRobert Ray Burch, Jesus G Moralez, Susan H Tilford
Life of this patent
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Abstract
Polyimide resin compositions that contain an aromatic polyimide, graphite, and acicular titanium dioxide are found to exhibit high thermal oxidative stability. Such compositions are especially useful in molded articles that are exposed to high temperatures, such as bushings, bearings, and seal rings that are used in aerospace, transportation, and materials handling applications.
Claims13
A composition comprising in admixture
- (a) an aromatic polyimide in an amount between about 30 and about 90 weight parts;
- (b) acicular titanium dioxide particles in an amount between about 0.5 and about 12 weight parts, wherein the average particle diameter is between about 10 and about 500 nm and the average particle length is between about 1 and about 100 μm, provided that the particle aspect ratio is at least 3;
- and
- (c) graphite in an amount between about 10 and about 60 weight parts;
- wherein all weight parts combined together total to 100 weight parts.
2 more elements
A composition comprising in admixture
- (a) an aromatic polyimide in an amount between about 35 and about 90 weight parts;
- (b) acicular titanium dioxide particles in an amount between about 0.5 and about 4.8 weight parts, wherein the average particle diameter is between about 10 and about 500 nm and the average particle length is between about 1 and about 100 μm, provided that the particle aspect ratio is at least 3;
- and
- (c) graphite in an amount between about 0 and about 60 weight parts;
- wherein all weight parts combined together total to 100 weight parts.
2 more elements
A three-dimensional article comprising an aromatic polyimide resin composition, said composition comprising in admixture
- (a) an aromatic polyimide in an amount between about 30 and about 90 weight parts;
- (b) acicular titanium dioxide particles in an amount between about 0.5 and about 10 weight parts, wherein the average particle diameter is between about 10 and about 500 nm and the average particle length is between about 1 and about 100 μm, provided that the particle aspect ratio is at least 3;
- and
- (c) graphite in an amount between about 0 and about 60 weight parts;
- wherein all weight parts combined together total to 100 weight parts.
2 more elements
Dependencies are inferred from the claim text.