US4550139A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixtures of polyacrylate resins and siloxane-styrene copolymers
Assignee: DRUG ROYALTY CORP Inc
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Filing: 1983-01-13
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Granted: 1985-10-29
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Expires: 2003-01-13
Abstract
Abstract Optically clear lenses, particularly contact lenses, may be prepared from an alloy of a polyacrylate resin and a siloxane-styrene copolymer, the alloy having an oxygen permeability greater than the polyacrylate resin. Preferably the polyacrylate is polymethylmethacrylate or methylacrylate-ethylacrylate copolymer, and the siloxane-styrene copolymer is preferably a polydimethylsiloxane-alpha-methylstyrene block copolymer. The alloy composition may be produced by melt mixing, preferably by polymerizing acrylate monomers in the presence of siloxane-styrene copolymer.
Inventors
- 👤 Barry C. Arkles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:19
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; C; C08; C08L; C08L33/00; C08L33/04; C08L33/06; C08L33/10; C08L33/12; C08L83/00; C08L83/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
30 words
An optically clear lens prepared from a compositions comprising an alloy of a polyacrylate resin and a siloxane-styrene copolymer, said alloy having an oxygen permeability greater than the polyacrylate resin.
Claim 2
Dependent Claim
30 words
An optically clear lens prepared from a compositions comprising an alloy of a polyacrylate resin and a siloxane-styrene copolymer, said alloy having an oxygen permeability greater than the polyacrylate resin.
Claim 3
Dependent Claim
14 words
A lens according to claim 1 wherein said siloxane-styrene copolymer is a block copolymer.
Claim 4
Dependent Claim
12 words
A lens according to claim 1 wherein said siloxane-styrene copolymer is polydimethylsiloxane-α-methylstyrene.
Claim 5
Dependent Claim
17 words
A lens according to claim 3 wherein said polydimethylsiloxane comprises about 60 weight percent of the copolymer.
Claim 6
Dependent Claim
13 words
A lens according to claim 1 wherein said polyacrylate resin is methylmethacrylate-ethylacrylate copolymer.
Claim 7
Dependent Claim
21 words
A lens according to claim 1 wherein said copolymer comprises between about 0.5 and about 65 weight percent of said alloy.
Claim 8
Dependent Claim
21 words
A lens according to claim 1 wherein said copolymer comprises between about 2 and about 40 weight percent of said alloy.
Claim 9
Dependent Claim
11 words
A lens according to claim 1 wherein said copolymer is polydimethylsiloxane-α-methylstyrene-p-t-butylstyrene.
Claim 10
Dependent Claim
11 words
A lens according to claim 1 wherein said copolymer is polydimethylsiloxane-α-methylstyrene-styrene.
Claim 11
Dependent Claim
11 words
A lens according to claim 1 which is a contact lens.
Claim 12
Dependent Claim
14 words
A lens according to claim 1 wherein said composition is produced by melt mixing.
Claim 13
Dependent Claim
21 words
A lens according to claim 1 wherein said composition is produced by polymerizing acrylate monomers in the presence of siloxane-styrene copolymer.
Claim 14
Dependent Claim
13 words
A lens according to claim 11 wherein said lens is a contact lens.
Claim 15
Dependent Claim
13 words
A lens according to claim 12 wherein said lens is a contact lens.
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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) | 1988-10-28 | 1989-04-29 | 1989-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-28 | 1993-04-29 | 1993-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-28 | 1997-04-29 | 1997-10-29 | $7700.00 | Window Closed / Lapsed |