US4810764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric materials with high oxygen permeability and low protein substantivity
Assignee: Bausch and Lomb Inc
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Filing: 1988-02-09
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Granted: 1989-03-07
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Expires: 2008-02-09
Abstract
Abstract Gas permeable biomedical devices, particularly contact lenses, are formed by polymerizing a mixture which comprises: (a) a polysiloxane which contains fluorinated side chains, (b) a toughening agent which is preferably a fluorinated methacrylate functional compound, and (c) an internal wetting agent which is preferably an oxazolone. r
Inventors
- 👤 Gary D. Friends
- 👤 Jay F. Kunzler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:46
CPC Classifications
C; C08; C08F; C08F30/00; C08F30/04; C08F30/08; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
147 words
A composition formed by polymerizing a mixture comprising: (a) 5 to 100 wt. parts polysiloxane containing fluorinated side chains represented by the general formula ##STR5## where A denotes a radical chosen from the group consisting of methacrylate or acrylate radicals, where R 1 and R 2 independently denote alkyl radicals with 1 to 6 carbon atoms or phenyl radicals, where R 3 and R 4 independently denote radicals chosen from the group consisting of alkyl radicals with 1 to 6 carbon atoms, phenyl radicals or fluorinated alkyl radicals with 1 to 6 carbon atoms, and either R 3 or R 4 denotes a fluorinated alkyl radical with 1 to 6 carbon atoms, and where m+n is at least 1, and n is at least 1; (b) 5 to 80 wt. parts of a toughening agent; and (c) 1 to 20 wt. parts of an internal wetting agent.
Claim 2
Dependent Claim
147 words
A composition formed by polymerizing a mixture comprising: (a) 5 to 100 wt. parts polysiloxane containing fluorinated side chains represented by the general formula ##STR5## where A denotes a radical chosen from the group consisting of methacrylate or acrylate radicals, where R 1 and R 2 independently denote alkyl radicals with 1 to 6 carbon atoms or phenyl radicals, where R 3 and R 4 independently denote radicals chosen from the group consisting of alkyl radicals with 1 to 6 carbon atoms, phenyl radicals or fluorinated alkyl radicals with 1 to 6 carbon atoms, and either R 3 or R 4 denotes a fluorinated alkyl radical with 1 to 6 carbon atoms, and where m+n is at least 1, and n is at least 1; (b) 5 to 80 wt. parts of a toughening agent; and (c) 1 to 20 wt. parts of an internal wetting agent.
Claim 3
Dependent Claim
11 words
The composition of claim 1 wherein A denotes a methacrylate radical.
Claim 4
Dependent Claim
43 words
The composition of claim 2 wherein either R 3 or R 4 is a fluorinated alkyl radical chosen from the group of radicals consisting of 3,3,3 trifluoropropyl, perfluoropropyl, trifluoromethyl, 2,2,2 trifluoroethyl, perfluoroethyl, 4,4,4 trifluorobutyl, perfluorobutyl, 5,5,5 trifluoropentyl, perfluoropentyl, 6,6,6 trifluorohexyl and perfluorohexyl radicals.
Claim 5
Dependent Claim
14 words
The composition of claim 3 where R 1 and R 2 denote methyl radicals.
Claim 6
Dependent Claim
20 words
The composition of claim 4 wherein the ratio of n to the sum of m+n is between 2 and 100.
Claim 7
Dependent Claim
21 words
The composition of claim 5 wherein R 4 denotes the fluorinated alkyl radical, 3,3,3-trifluoropropyl and R 3 denotes a methyl radical.
Claim 8
Dependent Claim
25 words
The composition of claim 1 wherein said toughening agent is a fluorinated methacrylate functional compound chosen from the group consisting of octafluoropentylmethacrylate, hexafluoroisopropylmethacrylate, and decylfluorododecylmethacrylate.
Claim 9
Dependent Claim
13 words
The composition of claim 7 wherein the fluorinated methacrylate functional is octafluoropentyl methacrylate.
Claim 10
Dependent Claim
49 words
The composition of claim 1 wherein the internal wetting agent is an oxazolone which can be represented by the general formula ##STR6## where R 1 and R 2 independently denote a hydrogen atom or a methyl radical and R 3 and R 4 independently denote methyl or cyclohexyl radicals.
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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) | 1992-03-06 | 1992-09-05 | 1993-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-06 | 1996-09-05 | 1997-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-06 | 2000-09-05 | 2001-03-07 | $7700.00 | Window Closed / Lapsed |