Patent US4035330A successfully refreshed from Google Patents.
US4035330A
Expired / Lapsed
US
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Hydrophilic copolymer of N,N-di(C1 -C2 alkyl)acrylamide cross-linked with a glycidyl ester
Assignee: BMC Industries Inc
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Filing: 1975-12-22
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Granted: 1977-07-12
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Expires: 1995-12-22
Abstract
Abstract A hydrophilic copolymer of an N,N-di(C1-C2 alkyl)acrylamide is disclosed. The copolymer is formed by reacting, based on 100 parts, from about 20-80 parts of a C1-C2 alkyl substituted acrylamide, about 10-80 parts of a C1-C4 alkyl acrylate, methacrylate, or combinations of acrylate and methacrylate, and about 2-20 parts of a glycidyl ester of acrylic, methacrylic or crotonic acid. The resulting copolymerization product can be equilibrated with water or other aqueous solutions to form hydrogels useful in forming shaped hydrogel articles. One particular shaped article which can be formed is a hydrophilic contact lens. A process for forming the hydrogels is also disclosed.
Inventors
- 👤 Herman S. Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:49
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F220/52; C08F220/54; Y; Y10; Y10S; Y10S524/00; Y10S524/916
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
66 words
A hydrogel formed from an aqueous solution gelled with a copolymer formed by reacting from about 20 to about 80 weight percent of an N,N-di(C 1 -C 2 alkyl)acrylamide with from about 10 to about 80 weight percent of at least one C 1 -C 4 alkyl acrylate and from about 2 to about 20 parts of a glycidyl ester of acrylic, methacrylic or crotonic acid.
Claim 2
Dependent Claim
66 words
A hydrogel formed from an aqueous solution gelled with a copolymer formed by reacting from about 20 to about 80 weight percent of an N,N-di(C 1 -C 2 alkyl)acrylamide with from about 10 to about 80 weight percent of at least one C 1 -C 4 alkyl acrylate and from about 2 to about 20 parts of a glycidyl ester of acrylic, methacrylic or crotonic acid.
Claim 3
Dependent Claim
39 words
A hydrogel of claim 1 wherein said copolymer is formed from about 40 to about 70 weight percent of N,N-dimethyl acrylamide and contains from about 15 to about 60 weight percent of a C 1 -C 4 alkyl methacrylate.
Claim 4
Dependent Claim
11 words
A hydrogel of claim 2 wherein said methacrylate comprises methyl methacrylate.
Claim 5
Dependent Claim
12 words
A hydrogel of claim 3 wherein said glycidyl ester is glycidyl methacrylate.
Claim 6
Dependent Claim
12 words
A hydrogel of claim 1 in the form of a shaped article.
Claim 7
Dependent Claim
12 words
A hydrogel of claim 1 in the form of a contact lens.
Claim 8
Dependent Claim
12 words
A hydrogel of claim 4 in the form of a contact lens.
Claim 9
Dependent Claim
13 words
A hydrogel of claim 7 wherein said aqueous solution comprises an isotonic solution.
Claim 10
Dependent Claim
66 words
A hydrogel formed from an aqueous solution gelled with a copolymer which is the reaction product of from about 40 to about 70 weight percent of an N,N-dimethyl acrylamide, from about 15 to about 60 weight percent of a C 1 -C 4 alkyl methacrylate and from about 4 to about 12 weight percent of a glycidyl ester of acrylic acid, methacrylic acid or crotonic acid.
Claim 11
Dependent Claim
66 words
A hydrogel formed from an aqueous solution gelled with a copolymer which is the reaction product of from about 40 to about 70 weight percent of an N,N-dimethyl acrylamide, from about 15 to about 60 weight percent of a C 1 -C 4 alkyl methacrylate and from about 4 to about 12 weight percent of a glycidyl ester of acrylic acid, methacrylic acid or crotonic acid.
Claim 12
Dependent Claim
12 words
A copolymer of claim 9 where said glycidyl ester is glycidyl methacrylate.
Claim 13
Dependent Claim
76 words
A contact lens comprising an optically clear hydrogel formed from an aqueous solution gelled with a hydrophilic, cross-linked copolymer formed from about 40 to about 70 weight percent of an N,N-di(C 1 -C 2 alkyl)acrylamide, from about 15 to about 60 weight percent of at least one C 1 -C 4 alkyl methacrylate or acrylate, and from about 2 to about 20 weight percent of a glycidyl ester of acrylic acid, methacrylic acid or crotonic acid.
Claim 14
Dependent Claim
76 words
A contact lens comprising an optically clear hydrogel formed from an aqueous solution gelled with a hydrophilic, cross-linked copolymer formed from about 40 to about 70 weight percent of an N,N-di(C 1 -C 2 alkyl)acrylamide, from about 15 to about 60 weight percent of at least one C 1 -C 4 alkyl methacrylate or acrylate, and from about 2 to about 20 weight percent of a glycidyl ester of acrylic acid, methacrylic acid or crotonic acid.
Claim 15
Dependent Claim
14 words
A contact lens of claim 11 wherein said aqueous solution comprises an isotonic solution.
Claim 16
Dependent Claim
28 words
A contact lens formed from a hydrogel comprising an aqueous solution and a copolymer formed from about: ______________________________________
N,N-dimethyl acrylamide
40-70%
Methyl methacrylate
15-60%
Glycidyl methacrylate
4-12%
______________________________________
Claim 17
Dependent Claim
28 words
A contact lens formed from a hydrogel comprising an aqueous solution and a copolymer formed from about: ______________________________________
N,N-dimethyl acrylamide
40-70%
Methyl methacrylate
15-60%
Glycidyl methacrylate
4-12%
______________________________________
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) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |