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US4626468A Expired / Lapsed US ⏱️ 0.0 years remaining

Microporous support layer with interfacially polymerized copolyamide thereon

Assignee: EIDP Inc
•
Filing: 1986-04-23
•
Granted: 1986-12-02
•
Expires: 2006-04-23
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Abstract

Abstract Composite reverse osmosis membranes are disclosed wherein a microporous support layer has superposed thereon an interfacially polymerized aromatic copolyamide. The aromatic copolyamide is derived from meta-phenylene diamine and, based on polymerized acid chloride present, 10 to 80% by weight repeating units derived from trimesoyl chloride, from 90 to 15% by weight repeating units derived from cyclohexane-1,3,5-tricarbonyl chloride and up to 40% by weight, repeating units derived from isophthaloyl chloride, terephthaloyl chloride or mixtures thereof. The membranes exhibit improved flux over similar membranes based on trimesoyl chloride while retaining similar salt rejection ability. The membranes containing the diacids exhibit improved flux over similar membranes based on the two triacid chlorides while retaining similar salt rejection ability.

Inventors

  • 👤 Sherman A. Sundet

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 03:07
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/12; B01D69/125; B01D69/1251; B01D71/00; B01D71/06; B01D71/56; C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/265; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T428/31504; Y10T428/31536

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 88 words
A composite reverse osmosis membrane having good salt rejection with high flux comprising a microporous support layer and superposed thereon a layer of an interfacially polymerized copolyamide consisting essentially of repeating units derived from meta-phenylene diamine and, based on polymerized acid chloride present, from 10 to 80 weight percent of the repeating units derived from trimesoyl chloride, 90 to 15 weight percent repeating units derived from cyclohexane-1,3,5-tricarbonyl chloride and, up to 40 weight percent of the repeating units are derived from isophthaloyl chloride, terephthaloyl chloride or mixtures thereof.
Claim 2
Dependent Claim 88 words
A composite reverse osmosis membrane having good salt rejection with high flux comprising a microporous support layer and superposed thereon a layer of an interfacially polymerized copolyamide consisting essentially of repeating units derived from meta-phenylene diamine and, based on polymerized acid chloride present, from 10 to 80 weight percent of the repeating units derived from trimesoyl chloride, 90 to 15 weight percent repeating units derived from cyclohexane-1,3,5-tricarbonyl chloride and, up to 40 weight percent of the repeating units are derived from isophthaloyl chloride, terephthaloyl chloride or mixtures thereof.
Claim 3
Dependent Claim 45 words
The reverse osmosis membrane of claim 1, wherein based on polymerized acid chloride present, from 15 to 40 weight percent of the repeating units are derived from trimesoyl chloride, and from 85 to 60 weight percent of the repeating units are derived from cyclohexane-1,3,5-tricarbonyl chloride.
Claim 4
Dependent Claim 67 words
The reverse osmosis membrane of claim 1 wherein, based on polymerized acid chloride present, from 10 to 40 weight percent of the repeating units are derived from trimesoyl chloride, 50 to 80 weight percent of the repeating units are derived from cyclohexane-1,3,5-tricarbonyl chloride and from 10 to 30 weight percent of the repeating units are derived from isophthaloyl chloride which may be in admixture with terephthaloyl chloride.

References Cited (Backward Citations)

US3649687A Cited
US3567632A Cited
US3744642A Cited
US4353802A Cited
US4277344A Cited
US4520044A Cited
US4529646A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1989-12-01 1990-06-02 1990-12-02 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1993-12-01 1994-06-02 1994-12-02 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1997-12-01 1998-06-02 1998-12-02 $7700.00 Window Closed / Lapsed

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