Patent US4565832A successfully refreshed from Google Patents.
US4565832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing packing material for use in liquid chromatography
Assignee: Japan Exlan Co Ltd
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Filing: 1984-11-30
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Granted: 1986-01-21
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Expires: 2004-11-30
Abstract
Abstract The present invention relates to a process for producing a packing material for use in liquid chromatography which comprises aqueous suspension polymerizing vinyl acetate, a (meth)acrylic acid ester or a glycidyl monovinyl ester or ether with a monomer mixture composed mainly of a cross-linking monomer in the presence of a diluent selected from among epichlorohydrin and glycidyl ethers and thereafter removing it from the resulting polymer particles by ring-opening the epoxy groups in said diluent. This process provides a packing material for use in liquid chromatography which is uniform and porous and moreover is excellent in mechanical strength.
Inventors
- 👤 Toshiyuki Kobashi
- 👤 Shoyo Takagi
- 👤 Hideo Naka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:59
CPC Classifications
C; C08; C08F; C08F218/00; C08F218/02; C08F218/04; C08F218/08; B; B01; B01J; B01J20/00; B01J20/22; B01J20/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
82 words
A process for producing a packing material for use in liquid chromatography which comprises aqueous suspension polymerizing vinyl acetate, a (meth)acrylic acid ester, or a glycidyl monovinyl ester or ether with a monomer mixture composed mainly of a cross-linking monomer in the presence of a diluent selected from among epichlorohydrin and glycidyl ethers, treating the resultant polymer particles so as to ring-open and hydrophilize epoxy groups in said diluent contained in said polymer particles, and washing the treating polymer particles with water.
Claim 2
Dependent Claim
82 words
A process for producing a packing material for use in liquid chromatography which comprises aqueous suspension polymerizing vinyl acetate, a (meth)acrylic acid ester, or a glycidyl monovinyl ester or ether with a monomer mixture composed mainly of a cross-linking monomer in the presence of a diluent selected from among epichlorohydrin and glycidyl ethers, treating the resultant polymer particles so as to ring-open and hydrophilize epoxy groups in said diluent contained in said polymer particles, and washing the treating polymer particles with water.
Claim 3
Dependent Claim
38 words
The process as claimed in claim 1 wherein epichlorohydrin or a glycidyl ether represented by the following general formula (I) is used as the diluent: ##STR5## wherein R is an alkyl group having 1 to 6 carbon atoms.
Claim 4
Dependent Claim
25 words
The process as claimed in claim 1 wherein the weight ratio of monomer to diluent is set within the range of from 10/1 to 1/10.
Claim 5
Dependent Claim
30 words
The process as claimed in claim 1 wherein the weight ratio of the total of monomer and diluent to water is set within the range of from 5/100 to 80/100.
References Cited (Backward Citations)
GB601184A
Cited
GB601541A
Cited
US2783250A
Cited
GB848350A
Cited
US3002823A
Cited
US3150112A
Cited
GB983516A
Cited
US3247154A
Cited
US3714112A
Cited
US4338172A
Cited
US4216083A
Cited
JPS55164208A
Cited
US4339500A
Cited
JPS56164955A
Cited
US4497710A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |