EP0215549A2
Expired / Lapsed
EP
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Hollow fibre annealing
Assignee: Bend Research Inc
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Filing: 1986-06-30
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Granted: —
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Expires: 2006-06-30
Abstract
Abstract A process for improving the internal burst strengths of microporous polymeric hollow fibers useful in RO applications is disclosed, which comprises heat curing such fibers at temperatures not exceeding their glass transition temperatures for five minutes up to several hours.
Inventors
- 👤 Walter C. Babcock
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 12:32
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0083; B01D69/00; B01D69/08; D; D01; D01D; D01D5/00; D01D5/24
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
39 words
A process for increasing the internal burst pressure of a microporous polymeric hollow fiber charaterized in that said fiber is heated at a temperature not exceeding the glass transition temperature of the polymer from which said fiber is made.
Claim 2
Dependent Claim
39 words
A process for increasing the internal burst pressure of a microporous polymeric hollow fiber charaterized in that said fiber is heated at a temperature not exceeding the glass transition temperature of the polymer from which said fiber is made.
Claim 3
Dependent Claim
37 words
A process as claimed in claim 1 wherein said fiber is made from a polysulfone, polyethersulfone, polyphenylsulfone, polyvinylidenefluoride, polyimide or polyetherimide and wherein the heating is conducted for a period of time not exceeding about 5 hours.
Claim 4
Dependent Claim
35 words
A process as claimed in Claim 1 or Claim 2 wherein said fiber is made from polysulfone, the heating temperature is from 100°C to 180°C land the duration of heating is 5 to 120 minutes.
Claim 5
Dependent Claim
35 words
A process as claimed in Claim 1 or Claim 2 wherein said fiber is made from polyethersulfone, the heating temperature is from 140°C to 180°C and the duration of heating is 5 to 120 minutes.
Claim 6
Dependent Claim
36 words
A lumen-side feed inside-skinned polymeric composite hollow fiber reverse osmosis membrane wherein the hollow fiber supports are polymer fibers which have been heated at a temperature not exceeding the glass transition temperature of the fiber polymer.
Claim 7
Dependent Claim
36 words
A lumen-side feed inside-skinned polymeric composite hollow fiber reverse osmosis membrane wherein the hollow fiber supports are polymer fibers which have been heated at a temperature not exceeding the glass transition temperature of the fiber polymer.
Claim 8
Dependent Claim
18 words
Marine water desalination wherein reverse osmosis is effected by means of a membrane as claimed in Claim 5.
References Cited (Backward Citations)
No citation records indexed.
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