US4547530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Miscible polymer blends containing poly(2-alkyl-2-oxazoline)
Assignee: Dow Chemical Co
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Filing: 1983-11-15
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Granted: 1985-10-15
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Expires: 2003-11-15
Abstract
Abstract Miscible blends of poly-2-oxazolines and thermoplastic polymers are disclosed herein. These blends exhibit a single glass transition point indicative of a miscible blend. The blends of this invention are useful as membranes, particularly separation membranes for mixtures of organic compounds or organic compounds and water and a pervaporation process.
Inventors
- 👤 Kathleen M. McCreedy
- 👤 James C. Pawloski
- 👤 Henno Keskkula
- 👤 Edward H. Yonkers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:04
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/36; B01D61/362; B01D71/00; B01D71/06; B01D71/58; B01D71/60; C; C08; C08L; C08L57/00; C08L79/00; C08L79/02; B01D2323/00; B01D2323/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
68 words
A semipermeable membrane comprising a blend or alloy of a first polymer which is a polymer of a 2-oxazoline and at least one other polymer which is not a polymer of a 2-oxazoline which other polymer is miscible with the first polymer at the relative proportions contained in the membrane, wherein the weight ratio of the first polymer and the other polymer is from about 19:1 to 1:19.
Claim 2
Dependent Claim
68 words
A semipermeable membrane comprising a blend or alloy of a first polymer which is a polymer of a 2-oxazoline and at least one other polymer which is not a polymer of a 2-oxazoline which other polymer is miscible with the first polymer at the relative proportions contained in the membrane, wherein the weight ratio of the first polymer and the other polymer is from about 19:1 to 1:19.
Claim 3
Dependent Claim
47 words
A membrane of claim 1 wherein the 2-oxazoline is represented by the formula: ##STR4## wherein R is halogen or an inertly substituted lower alkyl group, each R 1 is hydrogen, an inertly substituted or phenyl or an inertly substituted low alkyl, and x is 1 or 2.
Claim 4
Dependent Claim
10 words
The membrane of claim 2 wherein the 2-oxazoline is 2-ethyl-2-oxazoline.
Claim 5
Dependent Claim
11 words
The membrane of claim 2 which membrane is a pervaporation membrane.
Claim 6
Dependent Claim
24 words
The membrane of claim 1 wherein said other polymer is a styrene/acrylonitrile copolymer containing from about 18 to about 50 percent repeating acrylonitrile units.
Claim 7
Dependent Claim
8 words
The membrane of claim 1 which is cross-linked.
References Cited (Backward Citations)
US4007138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-14 | 1989-04-15 | 1989-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-14 | 1993-04-15 | 1993-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-14 | 1997-04-15 | 1997-10-15 | $7700.00 | Window Closed / Lapsed |