US5068255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange resins prepared by sequential monomer addition
Assignee: DIAMOND TECHNOLOGY PARTNERSHIP Co
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Filing: 1987-05-01
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Granted: 1991-11-26
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Expires: 2007-05-01
Abstract
Abstract A process for preparing copolymer beads suitable for conversion to ion exchange resins, comprising forming a polymeric matrix containing a plurality of free radicals, and continuously adding to said matrix, under conditions suitable for polymerizing a monomer feed which is imbibed by and polymerized within the matrices. Ion exchange resins prepared from beads made by such process exhibit improved osmotic and mechanical properties.
Inventors
- 👤 William I. Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:05
CPC Classifications
C; C08; C08F; C08F257/00; C08F257/02; B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/20; B01J41/00; B01J41/08; B01J41/12; B01J41/14; C08F285/00; C08F291/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
214 words
A process for preparing crosslinked copolymer beads comprising: (a) forming a suspension of a first monomer mix comprising from about 80 to about 99.95 parts by weight of a monoethylenically unsaturated monomer, about 0.05 to about 20 parts by weight of a polyethylenically unsaturated monomer and a sufficient amount of a substantially water-insoluble free radical initiator to catalyze the polymerization of said first monomer mix and a second monomer mix, then (b) polymerizing said first monomer mix until about 10 to about 80 weight percent of said monomers are converted to crosslinked polymer particles, the (c) adding to said suspension a second monomer mix, which second monomer mix comprises at least one ethylenically unsaturated monomer but contains essentially no free radical initiator, said addition of said second monomer mix being made under conditions including a temperature sufficient to initiate the free radical polymerization of the monomer in said second monomer mix such that said monomer mix is imbibed by said crosslinked polymer particles and the polymerization of said second monomer mix within said crosslinked polymer particles is catalyzed by the free radical initiator contained in said first monomer mix and wherein the monomers of the second monomer mix, when polymerized, comprise from about 5 to about 90 weight percent of the product copolymer beads.
Claim 2
Dependent Claim
214 words
A process for preparing crosslinked copolymer beads comprising: (a) forming a suspension of a first monomer mix comprising from about 80 to about 99.95 parts by weight of a monoethylenically unsaturated monomer, about 0.05 to about 20 parts by weight of a polyethylenically unsaturated monomer and a sufficient amount of a substantially water-insoluble free radical initiator to catalyze the polymerization of said first monomer mix and a second monomer mix, then (b) polymerizing said first monomer mix until about 10 to about 80 weight percent of said monomers are converted to crosslinked polymer particles, the (c) adding to said suspension a second monomer mix, which second monomer mix comprises at least one ethylenically unsaturated monomer but contains essentially no free radical initiator, said addition of said second monomer mix being made under conditions including a temperature sufficient to initiate the free radical polymerization of the monomer in said second monomer mix such that said monomer mix is imbibed by said crosslinked polymer particles and the polymerization of said second monomer mix within said crosslinked polymer particles is catalyzed by the free radical initiator contained in said first monomer mix and wherein the monomers of the second monomer mix, when polymerized, comprise from about 5 to about 90 weight percent of the product copolymer beads.
Claim 3
Dependent Claim
24 words
The process of claim 1 wherein the monoethylenically unsaturated monomer is a monovinylidene aromatic or an ester of an α, β-ethylenically unsaturated carboxylic acid.
Claim 4
Dependent Claim
20 words
The process of claim 2 wherein the polyethylenically unsaturated monomer is a polyvinylidene aromatic or an alkylene diacrylate or dimethacrylate.
Claim 5
Dependent Claim
21 words
The process of claim 3 wherein the monoethylenically unsaturated monomer is styrene, vinyl naphthalene, an alkyl-substituted styrene, or a halo-substituted styrene.
Claim 6
Dependent Claim
12 words
The process of claim 4 wherein the polyethylenically unsaturated monomer is divinylbenzene.
Claim 7
Dependent Claim
22 words
The process of claim 5 wherein the second monomer mix comprises a second monoethylenically unsaturated monomer and a second polyethylenically unsaturated monomer.
Claim 8
Dependent Claim
23 words
The process of claim 6 wherein the monoethylenically unsaturated monomer is a monovinylidene aromatic or an ester of an α,β-ethylenically unsaturated carboxylic acid.
Claim 9
Dependent Claim
21 words
The process of claim 7 wherein the second polyethylenically unsaturated monomer is a polyvinylidene aromatic or an alkylene diacrylate or diemthacrylate.
Claim 10
Dependent Claim
22 words
The process of claim 8 wherein the second monoethylenically unsaturated monomer is styrene, vinyl naphthalene, an alkyl-substituted styrene, or a halo-substituted styrene.
Claim 11
Dependent Claim
13 words
The process of claim 9 wherein the second polyethylenically unsaturated monomer is divinylbenzene.
Claim 12
Dependent Claim
25 words
The process of claim 10 wherein the amount of divinylbenzene in the first monomer mix is from about 1 to about 10 parts by weight.
Claim 13
Dependent Claim
33 words
The process of claim 11 wherein an effective amount of a polymerization inhibitor is added to the first monomer mix or the second monomer mix so as to control the rate of reaction.
Claim 14
Dependent Claim
29 words
The process of claim 12 wherein the monomers of the second monomer mix, when polymerized, comprise from about 25 to about 50 weight percent of the product copolymer beads.
Claim 15
Dependent Claim
26 words
The process of claim 1 or 13 further comprising attaching active ion exchange groups to the copolymer beads so as to form an ion exchange resin.
Claim 16
Dependent Claim
19 words
The process of claim 14 wherein the copolymer beads are sulfonated so as to prepare a cation exchange resin.
Claim 17
Dependent Claim
11 words
A cation exchange resin prepared by the process of claim 15.
References Cited (Backward Citations)
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |