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US4663409A
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Alpha, beta-unsaturated carbonyl modified amino acid monomer and polymers for biomedical uses
Assignee: Bausch and Lomb Inc
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Filing: 1984-12-24
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Granted: 1987-05-05
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Expires: 2004-12-24
Abstract
Abstract Inclusion of carbonyl modified amino acid monomers in polymeric compositions for biomedical applications, including contact lenses, increases the water content and oxygen permeability of the polymer without significant changes in other desirable properties of the polymer.
Inventors
- 👤 Gary D. Friends
- 👤 Richard C. Chromecek
- 👤 Raymond A. Yourd, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:42
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/26; C08F220/28; C08F226/00; C08F226/06; G02B1/045; G02B1/046
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
63 words
A shaped article for biomedical applications made from a polymer formed by polymerizing together a mixture comprising: (1) a major amount of one or more hydrophilic monomers having an olefinic bond, (2) an alpha, beta-unsaturated carbonyl modified amino acid monomer in an amount of 1 to 15 weight percent, and (3) a cross-linking agent in an amount of at least 0.1 weight percent.
Claim 2
Dependent Claim
63 words
A shaped article for biomedical applications made from a polymer formed by polymerizing together a mixture comprising: (1) a major amount of one or more hydrophilic monomers having an olefinic bond, (2) an alpha, beta-unsaturated carbonyl modified amino acid monomer in an amount of 1 to 15 weight percent, and (3) a cross-linking agent in an amount of at least 0.1 weight percent.
Claim 3
Dependent Claim
47 words
The article of claim 1 wherein the alpha,beta-unsaturated carbonyl modifier of the amino acid is selected from the group consisting of acrylic acid, crotonic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, 2-acrylamido-2-methylpropane sulfonic acid and the acid chloride, anhydride, amide and ester of said acids.
Claim 4
Dependent Claim
25 words
The article of claim 2 wherein the carbonyl modifier is selected from the group consisting of methacrylic acid, acrylic acid, methacryloyl chloride and acryloyl chloride.
Claim 5
Dependent Claim
28 words
The article of claim 3 wherein the carbonyl modified amino acid monomer is present in an amount of 3 to 12 weight percent of the total monomers present.
Claim 6
Dependent Claim
26 words
The article of claim 4 wherein said mixture includes a hydrophobic monomer in an amount of 1 to 15 weight percent of the total monomers present.
Claim 7
Dependent Claim
17 words
The article of claim 5 wherein the hydrophobic monomer contains at least one silicon or fluorine atom.
Claim 8
Dependent Claim
25 words
The article of claim 5 wherein the hydrophobic monomer is present in an amount of 4 to 15 weight percent of the total monomers present.
Claim 9
Dependent Claim
24 words
The article of claim 4 wherein the cross-linking agent present in an amount of 0.1 to 2.0 weight percent of the total monomers present.
Claim 10
Dependent Claim
19 words
The article of claim 8 wherein the hydrophilic monomer is a hydroxyalkyl ester of an alpha, beta-unsaturated carboxylic acid.
Claim 11
Dependent Claim
11 words
The article of claim 8 wherein there are two hydrophilic monomers.
Claim 12
Dependent Claim
12 words
The article of claim 9 wherein said article is a contact lens.
References Cited (Backward Citations)
US4060689A
Cited
US4172934A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |