US4256843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophilic separating carrier and preparation thereof
Assignee: Tosoh Corp
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Filing: 1980-03-07
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Granted: 1981-03-17
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Expires: 2000-03-07
Abstract
Abstract A hydrophilic separating carrier is a porous spherical gel having primary hydroxyl groups and is produced by an aqueous suspension homopolymerization of pentaerythritol dimethacrylate or an aqueous suspension copolymerization of pentaerythritol dimethacrylate and a methacrylate monomer having hydrophilic group and/or hydrophilic convertible group.
Inventors
- 👤 Hiroo Sasaki
- 👤 Katsuo Komiya
- 👤 Yoshio Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:29
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/281; B01J20/291; C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/26; C08F20/28; C08F22/00; C08F22/10; C08F22/1006; B01J2220/00; B01J2220/50; B01J2220/54; Y; Y10; Y10S; Y10S524/00; Y10S524/916
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
53 words
A hydrophilic separating carrier obtained by hydrolyzing, in an aqueous solution of a base, a porous spherical gel having primary hydroxyl group of the gel obtained by an aqueous suspension homopolymerization of pentaerythritol dimethacrylate or an aqueous suspension copolymerization of pentaerythritol dimethacrylate and a methacrylate monomer having hydrophilic group and/or hydrophilic convertible group.
Claim 2
Dependent Claim
53 words
A hydrophilic separating carrier obtained by hydrolyzing, in an aqueous solution of a base, a porous spherical gel having primary hydroxyl group of the gel obtained by an aqueous suspension homopolymerization of pentaerythritol dimethacrylate or an aqueous suspension copolymerization of pentaerythritol dimethacrylate and a methacrylate monomer having hydrophilic group and/or hydrophilic convertible group.
Claim 3
Dependent Claim
73 words
A process for producing a hydrophilic separating carrier which comprises hydrolyzing in an aqueous solution of a base, a porous spherical gel having primary hydroxyl group of the gel obtained by an aqueous suspension polymerization of pentaerythritol dimethacrylate or a mixture of pentaerythritol dimethacrylate and a methacrylate monomer having hydrophilic group and/or hydrophilic convertible group, in the presence of a radical polymerization initiator and an organic medium insoluble, at least partially, in water.
Claim 4
Dependent Claim
73 words
A process for producing a hydrophilic separating carrier which comprises hydrolyzing in an aqueous solution of a base, a porous spherical gel having primary hydroxyl group of the gel obtained by an aqueous suspension polymerization of pentaerythritol dimethacrylate or a mixture of pentaerythritol dimethacrylate and a methacrylate monomer having hydrophilic group and/or hydrophilic convertible group, in the presence of a radical polymerization initiator and an organic medium insoluble, at least partially, in water.
References Cited (Backward Citations)
US3681269A
Cited
US4133942A
Cited
US3878175A
Cited
US3997482A
Cited
GB1512462A
Cited
US4118347A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |