Patent US4277536A successfully refreshed from Google Patents.
US4277536A
Expired / Lapsed
US
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Bead polymers of viscous dimethacrylates
Assignee: Bayer AG
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Filing: 1979-11-13
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Granted: 1981-07-07
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Expires: 1999-11-13
Abstract
Abstract Bead polymers having a mean bead diameter of from 10 to 200μ of one or more polymerized viscous methacrylates and/or dimethacrylates having a viscosity of from 0.5 to 500 Pa.s and, optionally, up to 20% by weight of one or more other vinyl monomers.
Inventors
- 👤 Wolfgang Podszun
- 👤 Carlhans Suling
- 👤 Michael Walkowiak
- 👤 Hans H. Schulz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:57
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; C; C08; C08F; C08F22/00; C08F22/10; C08F22/1006; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
73 words
A bead having a mean bead diameter of from 10 to 200 microns, said bead comprising (a) 100 to 80% by weight of polymerized viscous dimethacrylate of the formula ##STR3## wherein R is the residue of a diol, said viscous dimethylacrylate having a viscosity of from 0.5 to 500 Pa.s. measured at 25° C. using a rotary viscosimeter, and (b) 0 to 20% by weight of at least one other copolymerized vinyl monomer.
Claim 2
Dependent Claim
73 words
A bead having a mean bead diameter of from 10 to 200 microns, said bead comprising (a) 100 to 80% by weight of polymerized viscous dimethacrylate of the formula ##STR3## wherein R is the residue of a diol, said viscous dimethylacrylate having a viscosity of from 0.5 to 500 Pa.s. measured at 25° C. using a rotary viscosimeter, and (b) 0 to 20% by weight of at least one other copolymerized vinyl monomer.
Claim 3
Dependent Claim
15 words
The bead of claim 1 wherein the viscous dimethacrylate is bis-GMA of the formula ##STR4##
Claim 4
Dependent Claim
22 words
The bead of claim 1 wherein the viscous dimethacrylate is the reaction product of trimethylhexamethylene diisocyanate and 2-hydroxyethylmethacrylate of the formula ##STR5##
Claim 5
Dependent Claim
27 words
The bead of claim 1 wherein said other vinyl monomer is selected from the group consisting of alkyl methacrylates, alkyl acrylates, styrene, divinyl benzene and vinyl acetate.
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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) | 1984-07-06 | 1985-01-05 | 1985-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-06 | 1989-01-05 | 1989-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-06 | 1993-01-05 | 1993-07-07 | $7700.00 | Window Closed / Lapsed |