Patent JPS5528900A successfully refreshed from Google Patents.
US3947401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogels of unsaturated ester copolymers
Assignee: CooperVision Inc
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Filing: 1973-07-17
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Granted: 1976-03-30
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Expires: 1993-07-17
Abstract
Abstract Bulk polymerized, water insoluble but water swellable polymer of monomers comprising water soluble monoester of acrylic or methacrylic acid with a polyhydric alcohol; and glycidyl methacrylate, and/or glycidyl acrylate, and/or glycidyl crotonate. The polymer may be swelled in aqueous solution to provide a transparent hydrogel having excellent physical properties, and suitable in an ophthalmic lens.
Inventors
- 👤 Paul Stamberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:04
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/20; Y; Y10; Y10S; Y10S524/00; Y10S524/916
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
114 words
A shape-retaining hydrogel consisting essentially of a water-insoluble but water-swellable copolymer of a bulk polymerized monomer mixture consisting essentially of: A. polymerizable monoester of an ethylenically unsaturated acid selected from the group of acrylic acid, methacrylic acid and mixtures thereof, and an aliphatic saturated polyhydric alcohol having 2 to 6 alcohol groups; and B. glycidyl ester selected from the group consisting of glycidyl acrylate, glycidyl methacrylate, glycidyl crotonate, and mixtures thereof, and wherein said monomer mixture contains based upon the total weight of (A) and (B) from about 60 to 99.75% of (A) and from about 0.25 to 40% of (B); and from about 10 to about 90% by weight of an aqueous liquid.
Claim 2
Dependent Claim
114 words
A shape-retaining hydrogel consisting essentially of a water-insoluble but water-swellable copolymer of a bulk polymerized monomer mixture consisting essentially of: A. polymerizable monoester of an ethylenically unsaturated acid selected from the group of acrylic acid, methacrylic acid and mixtures thereof, and an aliphatic saturated polyhydric alcohol having 2 to 6 alcohol groups; and B. glycidyl ester selected from the group consisting of glycidyl acrylate, glycidyl methacrylate, glycidyl crotonate, and mixtures thereof, and wherein said monomer mixture contains based upon the total weight of (A) and (B) from about 60 to 99.75% of (A) and from about 0.25 to 40% of (B); and from about 10 to about 90% by weight of an aqueous liquid.
Claim 3
Dependent Claim
14 words
The hydrogel of claim 1 which is in the form of a contact lens.
Claim 4
Dependent Claim
20 words
The shape-retaining hydrogel of claim 1 which contains from about 20 to about 60% by weight of an aqueous liquid.
Claim 5
Dependent Claim
53 words
The shape-retaining hydrogel of claim 1 wherein said monomer mixture contains based upon the total weight of (A) and (B) from about 85 to about 97.5% of (A) and from about 2.5 to about 15% of (B) and which further contains from about 20 to about 60% by weight of an aqueous liquid.
Claim 6
Dependent Claim
13 words
The hydrogel of claim 1 wherein said polymerizable monoester is hydroxy ethyl methacrylate.
Claim 7
Dependent Claim
25 words
The hydrogel of claim 1 wherein said copolymer consists essentially of a bulk polymerized monomer mixture consisting essentially of hydroxy ethyl methacrylate and glycidyl methacrylate.
Claim 8
Dependent Claim
36 words
The hydrogel of claim 1 wherein said monomer mixture contains based upon the combined weight of (A) and (B) from about 85 to about 97.5% of (A) and from about 2.5 to about 15% of (B).
Claim 9
Dependent Claim
14 words
The hydrogel of claim 7 which is in the form of a contact lens.
Claim 10
Dependent Claim
47 words
The hydrogel of claim 1 wherein said monomer mixture contains based upon the combined weight of (A) and (B) from about 85 to about 97.5% of (A) and from about 2.5 to about 15% of (B) wherein (A) is hydroxy ethyl methacrylate and (B) is glycidyl methacrylate.
Claim 11
Dependent Claim
26 words
The hydrogel of claim 1 wherein said polyhydric alcohol is selected from the group of ethylene glycol, propylene glycol, polyethylene glycol, polypropylene glycol and mixtures thereof.
Claim 12
Dependent Claim
12 words
The hydrogel of claim 1 wherein said mono-ester is hydroxy ethyl acrylate.
Claim 13
Dependent Claim
12 words
The hydrogel of claim 1 wherein said mono-ester is hydroxy propyl methacrylate.
Claim 14
Dependent Claim
40 words
The shape-retaining hydrogel of claim 1 wherein said polyhydric alcohol is selected from the group consisting of ethylene glycol, 1,3-propanediol, diethylene glycol, dipropylene glycol, polyethylene glycol, polypropylene glycol, 1,6-hexamethylene glycol, 1,4-butanediol, glycerol, trimethylol propane, trimethylol ethane, pentaerythritol, mannitol and sorbitol.
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) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |