US5035803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High yield water-soluble polymer silica separation resins
Assignee: University of California
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Filing: 1989-02-14
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Granted: 1991-07-30
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Expires: 2009-02-14
Abstract
Abstract Separation resins are disclosed where silica particles are surface activated by attaching a vinyl terminated lower alkoxy silane to the silica particle and then hydrolyzing the particles. The resulting hydrolyzed particles are hydrophilic and retain at least 10 micromoles of the hydrolyzed vinyl terminated lower alkoxy silane per square centimeter of the silica. A water soluble polymer is then graft polymerized onto the activated and hydrolyzed silica particles. The large amount of hydrolyzed vinyl terminated lower alkoxy silane which remains on the silica along with the hydrophilic nature of the hydrolyzed silica produces an activated particle which is useful for graft polymerization of water soluble polymers onto the particles in large amounts not previously possible. A method for preparing the separation resins is also disclosed.
Inventors
- 👤 Yoram Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:46
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/30; B01J20/32; B01J20/3202; B01J20/3204; B01J20/02; B01J20/10; B01J20/103; B01J20/22; B01J20/26; B01J20/261; B01J20/28; B01J20/28002; B01J20/28004; B01J20/28054; B01J20/28057; B01J20/28078; B01J20/281; B01J20/286; B01J20/3092; B01J20/3214; B01J20/3217; B01J20/3231; B01J20/3242; B01J20/3244; B01J20/3246; B01J20/3268; B01J20/327; B01J20/3278; C; C02; C02F; C02F1/00; C02F1/28; C02F1/285; B01J2220/00; B01J2220/50; B01J2220/54; B01J2220/58; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2995; Y10T428/2998
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
100 words
A solid separation resin consisting essentially of silica particles which are surface activated by having chemically bonded to the surface thereof vinyl hydroxysilane in an amount of at least 10 micromoles of said vinyl hydroxysilane per square meter of said silica particles, said vinyl hydroxy silane having been formed by hydrolysis of a vinyl terminated lower alkoxy silane attached to said silica particle, said surface activated silica particles having graft polymerized to the vinyl hydroxysilane a water soluble vinyl polymer in an amount of at least 2 milligrams of said water soluble vinyl polymer per square meter of said silica.
Claim 2
Dependent Claim
100 words
A solid separation resin consisting essentially of silica particles which are surface activated by having chemically bonded to the surface thereof vinyl hydroxysilane in an amount of at least 10 micromoles of said vinyl hydroxysilane per square meter of said silica particles, said vinyl hydroxy silane having been formed by hydrolysis of a vinyl terminated lower alkoxy silane attached to said silica particle, said surface activated silica particles having graft polymerized to the vinyl hydroxysilane a water soluble vinyl polymer in an amount of at least 2 milligrams of said water soluble vinyl polymer per square meter of said silica.
Claim 3
Dependent Claim
14 words
Solid separation resin according to claim 1 wherein said water soluble polymer is polyvinylpyrrolidone.
Claim 4
Dependent Claim
13 words
Solid separation resin according to claim 2 wherein said silica particles are porous.
Claim 5
Dependent Claim
25 words
Solid separation according to claim 3 wherein said porous silica particles have a substantial uniform pore size of about 100 Angstroms to about 4,000 Angstroms.
Claim 6
Independent Claim
119 words
A method for removing organic compounds from water, comprising contacting said water having said organic compounds with an effective amount of solid separation resin consisting of silica particles having chemically bonded to the surface thereof vinyl hydroxysilane in an amount of at least 10 micromoles of said vinyl hydroxysilane per square meter of said silica particles, said vinyl hydroxy silane having been formed by hydrolysis of a vinyl terminated lower alkoxy silane attached to said silica particle, said vinylalkoxysilane having graft polymerized thereon a water soluble vinyl polymer in an amount of at least about 2 milligrams of said water soluble vinyl polymer per square meter of said silica particles having vinyl hydroxysilane chemically bonded to the surface thereof.
Claim 7
Independent Claim
119 words
A method for removing organic compounds from water, comprising contacting said water having said organic compounds with an effective amount of solid separation resin consisting of silica particles having chemically bonded to the surface thereof vinyl hydroxysilane in an amount of at least 10 micromoles of said vinyl hydroxysilane per square meter of said silica particles, said vinyl hydroxy silane having been formed by hydrolysis of a vinyl terminated lower alkoxy silane attached to said silica particle, said vinylalkoxysilane having graft polymerized thereon a water soluble vinyl polymer in an amount of at least about 2 milligrams of said water soluble vinyl polymer per square meter of said silica particles having vinyl hydroxysilane chemically bonded to the surface thereof.
Claim 8
Dependent Claim
13 words
Method according to claim 5 wherein said water soluble vinyl polymer is polyvinylpyrrolidone.
Claim 9
Dependent Claim
12 words
A method according to claim 5 wherein said silica particles are impermeable.
Claim 10
Independent Claim
148 words
A method for separating water soluble organic compounds of varying molecular weight dissolved in water, said water soluble organic compounds having a molecular weight of at least about 200 which comprises contacting said water soluble organic compounds with an effective amount of a solid separation resin consisting of porous silica particles having chemically bonded to the surface thereof vinyl hydroxysilane in an amount of at least 10 micromoles of said vinyl hydroxysilane per square meter of said porous silica particles, said vinyl hydroxy silane having been formed by hydrolysis of a vinyl terminated lower alkoxy silane attached to said silica particle, said porous silica particles having chemically bonded thereto vinyl hydroxysilane having graft polymerized thereon a water soluble vinyl polymer in an amount of at least about 2 milligrams of said water soluble vinyl polymer per square meter of said silica particles having vinyl hydroxysilane chemically bonded thereto.
Claim 11
Independent Claim
148 words
A method for separating water soluble organic compounds of varying molecular weight dissolved in water, said water soluble organic compounds having a molecular weight of at least about 200 which comprises contacting said water soluble organic compounds with an effective amount of a solid separation resin consisting of porous silica particles having chemically bonded to the surface thereof vinyl hydroxysilane in an amount of at least 10 micromoles of said vinyl hydroxysilane per square meter of said porous silica particles, said vinyl hydroxy silane having been formed by hydrolysis of a vinyl terminated lower alkoxy silane attached to said silica particle, said porous silica particles having chemically bonded thereto vinyl hydroxysilane having graft polymerized thereon a water soluble vinyl polymer in an amount of at least about 2 milligrams of said water soluble vinyl polymer per square meter of said silica particles having vinyl hydroxysilane chemically bonded thereto.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-29 | 1995-01-28 | 1995-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-29 | 1999-01-28 | 1999-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-29 | 2003-01-28 | 2003-07-30 | $7700.00 | Window Closed / Lapsed |