US4246386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange resins
Assignee: Rohm and Haas Co
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Filing: 1978-05-08
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Granted: 1981-01-20
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Expires: 1998-05-08
Abstract
Abstract Hard, infusible, discrete beads of crosslinked copolymer are prepared by free-radical catalyzed polymerization of a monomer mixture in aqueous dispersion wherein a minor amount of a modifier, specifically an organic compound containing acetylenic or allylic unsaturation having the ability to moderate the rate of polymerization, is incorporated in the monomer mixture. Ion exchange resins having improved mechanical strength are obtained by attaching functional groups to the copolymer.
Inventors
- 👤 Thomas J. Howell
- 👤 William G. Paterson
- 👤 Ian Pattison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:03
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/20; C; C08; C08F; C08F2/00; C08F2/12; C08F2/16; C08F2/38; C08F2/40
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
103 words
In the process of preparing hard, crosslinked, discrete copolymer beads by the free-radical polymerization in an aqueous dispersion of a monomer mixture comprised of a major proportion of (a) monovinyl monomer, and a minor proportion of (b) crosslinking monomer having at least two active vinyl groups, the improvement which comprises conducting the polymerization reaction with a modifier in admixture with the monomer mixture in a concentration of from about 0.01 to about 10 millimoles per mole of monomers, in the monomer mixture (a) and (b), said modifier being an organic compound containing acetyleneic unsaturation, said compound being capable of moderating rate of polymerization.
Claim 2
Dependent Claim
103 words
In the process of preparing hard, crosslinked, discrete copolymer beads by the free-radical polymerization in an aqueous dispersion of a monomer mixture comprised of a major proportion of (a) monovinyl monomer, and a minor proportion of (b) crosslinking monomer having at least two active vinyl groups, the improvement which comprises conducting the polymerization reaction with a modifier in admixture with the monomer mixture in a concentration of from about 0.01 to about 10 millimoles per mole of monomers, in the monomer mixture (a) and (b), said modifier being an organic compound containing acetyleneic unsaturation, said compound being capable of moderating rate of polymerization.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the monovinyl monomer is a monovinyl aromatic monomer.
Claim 4
Dependent Claim
18 words
The process of claim 2 wherein the monovinyl aromatic monomer is styrene and the crosslinking monomer is divinylbenzene.
Claim 5
Dependent Claim
27 words
The process of claim 3 wherein the concentration of modifier is from 0.1 to 10 millimoles per mole of monomers in the monomer mixture (a) and (b).
Claim 6
Dependent Claim
10 words
The process of claim 3 wherein the modifier is phenylacetylene.
Claim 7
Dependent Claim
116 words
In the process of preparing hard, cross-linked, discrete copolymer beads by the free-radical polymerization in an aqueous dispersion of a monomer mixture comprised of a major proportion of (a) monovinyl monomer and a minor proportion of (b) crosslinking monomer having at least two active vinyl groups, the improvement which comprises conducting the polymerization reaction with a modifier in admixture with the monomer mixture in a concentration of about 0.01 to about 10 millimole per mole of monomers in the monomer mixture (a) and (b), said modifier being an organic compound containing allylic unsaturation and being selected from the group consisting of terpinolene and the dimer of methylcyclopentadiene, said compound being capable of moderating rate of polymerization.
Claim 8
Dependent Claim
116 words
In the process of preparing hard, cross-linked, discrete copolymer beads by the free-radical polymerization in an aqueous dispersion of a monomer mixture comprised of a major proportion of (a) monovinyl monomer and a minor proportion of (b) crosslinking monomer having at least two active vinyl groups, the improvement which comprises conducting the polymerization reaction with a modifier in admixture with the monomer mixture in a concentration of about 0.01 to about 10 millimole per mole of monomers in the monomer mixture (a) and (b), said modifier being an organic compound containing allylic unsaturation and being selected from the group consisting of terpinolene and the dimer of methylcyclopentadiene, said compound being capable of moderating rate of polymerization.
Claim 9
Dependent Claim
14 words
The process of claim 6 wherein the monovinyl monomer is a monovinyl aromatic monomer.
Claim 10
Dependent Claim
18 words
The process of claim 7 wherein the monovinyl aromatic monomer is styrene and the crosslinking monomer is divinylbenzene.
Claim 11
Dependent Claim
10 words
The process of claim 6 wherein the modifier is terpinolene.
Claim 12
Dependent Claim
13 words
The process of claim 6 wherein the modifier is the dimer of methylcyclopentadiene.
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) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |