SELF-ASSEMBLED STRUCTURE AND MEMBRANE COMPRISING BLOCK COPOLYMER AND PROCESS FOR PRODUCING THE SAME BY SPIN COATING (Va)
US-2015344653-A1 · Dec 3, 2015 · US
Polybenzoxazole membranes from self-cross-linkable aromatic polyimide membranes
US9211508B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9211508-B2 |
| Application number | US-201314039570-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 27, 2013 |
| Priority date | Sep 27, 2013 |
| Publication date | Dec 15, 2015 |
| Grant date | Dec 15, 2015 |
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Abstract
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A method of making a polybenzoxazole (PBO) membrane from a self-cross-linked aromatic polyimide polymer membrane is provided. These membranes are useful in the separation of gas mixtures and liquid mixtures. The PBO membrane is made by fabricating a self-cross-linkable aromatic polyimide polymer membrane comprising both hydroxyl functional groups and carboxylic acid functional groups; cross-linking the polymer to form a self-cross-linked aromatic polyimide polymer membrane by heating the membrane at 250° to 300° C. under an inert atmosphere; and thermal heating the self-cross-linked aromatic polyimide polymer membrane at a temperature from about 350° to 500° C. under an inert atmosphere to convert the self-cross-linked aromatic polyimide polymer membrane into a PBO membrane. A membrane coating step may be added by coating the selective layer surface of the PBO membrane with a thin layer of high permeability material.
First claim
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The invention claimed is: 1. A method of making a polybenzoxazole membrane comprising (a) fabricating a self-cross-linkable aromatic polyimide polymer membrane from the self-cross-linkable aromatic polyimide polymer comprising both hydroxyl functional groups and carboxylic acid functional groups; (b) cross-linking the self-cross-linkable aromatic polyimide polymer membrane to form a self-cross-linked aromatic polyimide polymer membrane by heating the membrane at 250° C. to 300°…
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Operations & Transport · mapped topic
Operations & Transport · mapped topic
Operations & Transport · mapped topic
Operations & Transport · mapped topic
- B01D71/62Primary
Operations & Transport · mapped topic
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- What does patent US9211508B2 cover?
- A method of making a polybenzoxazole (PBO) membrane from a self-cross-linked aromatic polyimide polymer membrane is provided. These membranes are useful in the separation of gas mixtures and liquid mixtures. The PBO membrane is made by fabricating a self-cross-linkable aromatic polyimide polymer membrane comprising both hydroxyl functional groups and carboxylic acid functional groups; cross-lin…
- Who is the assignee on this patent?
- Uop Llc
- What technology area does this patent fall under?
- Primary CPC classification B01D71/62. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Dec 15 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).