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 12:47
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.
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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) | 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 |