US4280923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for fractionating soluble polymers and colloidal particles
Assignee: Dow Chemical Co
•
Filing: 1978-12-18
•
Granted: 1981-07-28
•
Expires: 1998-12-18
Abstract
Abstract Colloidal particles are fractionated by size and dissolved polymers are fractionated by molecular weight by passing a polar solvent dispersion containing one or both through a bed of surface-bonded particles wherein the particles consist of a nonswellable inert core with a polar solvent-swellable surface coating of bonded organic polymer. The core can be either an insoluble cross-linked organic polymer gel or an inorganic solid such as silica or alumina.
Inventors
- 👤 Hamish Small
- 👤 Jitka K. Solc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:27
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/281; B01J20/291; B01D; B01D15/00; B01D15/08; B01D15/26; B01D15/34; B01J20/02; B01J20/10; B01J20/103; B01J20/22; B01J20/26; B01J20/261; B01J20/262; B01J20/264; B01J20/28; B01J20/28002; B01J20/28004; B01J20/28014; B01J20/28016; B01J20/28019; B01J20/28047; B01J20/286; B01J20/30; B01J20/3092; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3206; B01J20/3208; B01J20/321; B01J20/3214; B01J20/3217; B01J20/3231; B01J20/3242; B01J20/3268; B01J20/327; B01J20/3272; B01J20/3291; B01J20/3293; B01J2220/00; B01J2220/50; B01J2220/54; B01J2220/58; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2998
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
117 words
A liquid chromatographic method for separating different particle size fractions of a suspended colloidal particle system and different molecular weight fractions of a dissolved polymer system, which method comprises passing a polar solvent dispersion containing at least one of said systems through a bed of essentially nonswellable inert granules of a water-insoluble inorganic solid having a chemically bonded surface coating of about 0.01-10 percent by weight of a hydrophilic polymer which is (a) a polymerized alpha-olefin having a functional group substituent selected from the group consisting of carboxyl, carboxy ester, amino, quaternary ammonium, amido, and sulfonate or (b) a water-soluble or methanol-soluble polyethylene glycol, polypropylene glycol or mixed ethylene-propylene polyglycol, said coating swellable by said polar solvent.
Claim 2
Dependent Claim
117 words
A liquid chromatographic method for separating different particle size fractions of a suspended colloidal particle system and different molecular weight fractions of a dissolved polymer system, which method comprises passing a polar solvent dispersion containing at least one of said systems through a bed of essentially nonswellable inert granules of a water-insoluble inorganic solid having a chemically bonded surface coating of about 0.01-10 percent by weight of a hydrophilic polymer which is (a) a polymerized alpha-olefin having a functional group substituent selected from the group consisting of carboxyl, carboxy ester, amino, quaternary ammonium, amido, and sulfonate or (b) a water-soluble or methanol-soluble polyethylene glycol, polypropylene glycol or mixed ethylene-propylene polyglycol, said coating swellable by said polar solvent.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein the bonded polymer coating is a polymeric alpha-olefinic carboxylic acid.
Claim 4
Dependent Claim
18 words
The method of claim 2 wherein the granules are silica and the bonded polymer coating is polyacrylic acid.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein the polar solvent dispersion contains both a suspended colloidal particle system and a dissolved polymer system.
Claim 6
Dependent Claim
86 words
A liquid chromatographic method for separating different particle size fractions of a suspended colloidal particle system and different molecular weight fractions of a dissolved polymer system, which method comprises passing a polar solvent dispersion containing at least one of said systems through a bed of essentially nonswellable inert granules of a nonporous cross-linked organic polymer gel having a chemically bonded surface coating of about 0.01-10 percent by weight of a hydrophilic polymer which is a water-soluble or methanol-soluble polyethylene glycol, polypropylene glycol, or mixed ethylene-propylene polyglycol.
Claim 7
Dependent Claim
86 words
A liquid chromatographic method for separating different particle size fractions of a suspended colloidal particle system and different molecular weight fractions of a dissolved polymer system, which method comprises passing a polar solvent dispersion containing at least one of said systems through a bed of essentially nonswellable inert granules of a nonporous cross-linked organic polymer gel having a chemically bonded surface coating of about 0.01-10 percent by weight of a hydrophilic polymer which is a water-soluble or methanol-soluble polyethylene glycol, polypropylene glycol, or mixed ethylene-propylene polyglycol.
Claim 8
Dependent Claim
13 words
The method of claim 5 wherein the polymer coating is a polyethylene glycol.
Claim 9
Dependent Claim
16 words
The method of claim 5 wherein the polar solvent dispersion consists of a dissolved polymer system.
References Cited (Backward Citations)
US3295296A
Cited
US3489699A
Cited
US3492155A
Cited
US3698931A
Cited
US3865717A
Cited
US3962206A
Cited
JPS5145686A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-27 | 1985-01-26 | 1985-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-27 | 1989-01-26 | 1989-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-27 | 1993-01-26 | 1993-07-28 | $7700.00 | Window Closed / Lapsed |