Reactive friable polyimide and method of making
AssigneeSabic Global Technologies B.V.
InventorsViswanathan Kalyanaraman, Nitin Vilas Tople
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Abstract
Disclosed herein is a friable polyimide powder having a weight average molecular weight, as determined by gel permeation chromatography (GPC) using polystyrene standards, of less than or equal to 24,500 Daltons and a reactive aromatic amine end group concentration greater than or equal to 3 mole percent, wherein 90 weight percent of the powder particles are reducible to less than or equal to 75 micrometers by mechanical grinding. Also disclosed is a method of making the friable polyimide powder, a processed polyimide resulting from the friable polyimide powder and compositions comprising the processed polyimide.
Claims20
A friable polyimide powder having
- a weight average molecular weight, as determined by gel permeation chromatography using polystyrene standards, of less than or equal to 24,500 Daltons, and
- a reactive aromatic amine end group concentration greater than 3 mole percent,
- wherein 90 weight percent of the powder particles are reducible to less than or equal to 75 micrometers by mechanical grinding.
A method of making a friable polyimide powder comprising melt blending
- a first polyimide having a weight average molecular weight greater than or equal to 30,000 Daltons with
- greater than 3 mole percent of an aromatic diamine under conditions effective to form a friable polyimide powder;
- having a weight average molecular weight less than or equal to 24,500 Daltons,
- an aromatic amine reactive end group concentration greater than 3 mole percent, and
- wherein 90 weight percent of the powder particles are reducible to less than or equal to 75 micrometers by mechanical grinding
- wherein the weight average molecular weight is determined by gel permeation chromatography using polystyrene standards, and mole percent is based on the moles of the dianhydride in the first polyimide polymer.
Dependencies are inferred from the claim text.