Patent US4413089A successfully refreshed from Google Patents.
US4413089A
Expired / Lapsed
US
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Use of iron oxide pigments in a polymethyl methacrylate article
Assignee: EIDP Inc
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Filing: 1982-03-10
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Granted: 1983-11-01
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Expires: 2002-03-10
Abstract
Abstract A dispersion of iron oxide pigments, selected according to particle size to avoid interference with desired properties is added to a polymerizable acrylic composition containing alumina trihydrate as filler. This mixture is cured to form a filled polymeric structure containing 15 to 80% by weight polymethyl methacrylate and 20 to 85% by weight alumina trihydrate with a pleasing uniform color, maintaining desired properties of machinability, translucency, and visual depth.
Inventors
- 👤 Francis M. Gavin
- 👤 Anne M. Kruglewicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:55
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/44; C08F20/00; C08F20/02; C08F20/10; C08F20/12; C08F20/14; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K2003/2227; C08K2003/2265; C08K2003/2272; C08K2003/2275
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
In a process for preparing a filled polymethyl methacrylate article, said article consisting essentially of 20 to 85% by weight alumina trihydrate and 15 to 80% by weight polymethyl methacrylate and having properties of translucency and an appearance of visual depth, said process comprising curing a polymerizable composition consisting essentially of polymerizable methyl methacrylate and alumina trihydrate, the improvement whereby a dispersion of iron oxide pigments having a particle size of 10 microns or less is prepared and blended thoroughly with said polymerizable composition prior to curing, whereby upon curing said article has properties of uniform color in addition to maintaining said properties of translucency and an appearance of visual depth.
Claim 2
Dependent Claim
111 words
In a process for preparing a filled polymethyl methacrylate article, said article consisting essentially of 20 to 85% by weight alumina trihydrate and 15 to 80% by weight polymethyl methacrylate and having properties of translucency and an appearance of visual depth, said process comprising curing a polymerizable composition consisting essentially of polymerizable methyl methacrylate and alumina trihydrate, the improvement whereby a dispersion of iron oxide pigments having a particle size of 10 microns or less is prepared and blended thoroughly with said polymerizable composition prior to curing, whereby upon curing said article has properties of uniform color in addition to maintaining said properties of translucency and an appearance of visual depth.
References Cited (Backward Citations)
GB1302403A
Cited
US3706825A
Cited
US3780156A
Cited
US3827933A
Cited
US3847865A
Cited
US4145477A
Cited
US4085246A
Cited
US4159301A
Cited
FR2342948A1
Cited
US4183991A
Cited
US4185070A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |