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US4132560A
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US
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Pigmented microporous silica microspheres
Assignee: EIDP Inc
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Filing: 1978-01-09
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Granted: 1979-01-02
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Expires: 1998-01-09
Abstract
Abstract Pigmented silica microsphere having an average diameter from 2 μm to 100 μm and consisting essentially of from 10% to 70% by weight of particulate pigment, dispersed throughout a microporous silica matrix and, optionally, containing a coating of dense amorphous silica. The microspheres are produced by acidifying a water-in-oil emulsion. The pigmented silica microspheres are particularly useful as opacifying agents for coating compositions and as fillers for paper.
Inventors
- 👤 Mark J. Marquisee
- 👤 Lionel S. Sandell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:09
CPC Classifications
C; C09; C09C; C09C1/00; C09B; C09B67/00; C09B67/006; C01; C01P; C01P2006/00; C01P2006/12; C01P2006/16; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
69 words
Pigmented silica microsphere having a diameter from 2μ to 100μ and consisting essentially of from 10% to 70% by weight of particulate pigment, based on the total weight of the microsphere, dispersed throughout a microporous silica matrix, the silica matrix containing from 20% to 60% by volume of micropores, based on the total volume of the microsphere, the micropores having a median diameter from 0.004 μm to 0.05 μm.
Claim 2
Dependent Claim
69 words
Pigmented silica microsphere having a diameter from 2μ to 100μ and consisting essentially of from 10% to 70% by weight of particulate pigment, based on the total weight of the microsphere, dispersed throughout a microporous silica matrix, the silica matrix containing from 20% to 60% by volume of micropores, based on the total volume of the microsphere, the micropores having a median diameter from 0.004 μm to 0.05 μm.
Claim 3
Dependent Claim
32 words
Pigmented silica microsphere according to claim 1 having a coating of dense amorphous silica in an amount from 2% to 40% by weight, based on the total weight of the coated microsphere.
Claim 4
Dependent Claim
17 words
Pigmented silica microsphere according to claim 1 having an average diameter from 2 μm to 50 μm.
Claim 5
Dependent Claim
17 words
Pigmented silica microsphere according to claim 1 having an average diameter from 2 μm to 25 μm.
Claim 6
Dependent Claim
23 words
Pigmented silica microsphere according to claim 1 wherein the particulate pigment is an inorganic pigment having a refractive index of at least 2.
Claim 7
Dependent Claim
21 words
Pigmented silica microsphere according to claim 5 wherein the inorganic pigment has a particle size from 0.1 μm to 0.5 μm.
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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) | 1982-01-01 | 1982-07-03 | 1983-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-01 | 1986-07-03 | 1987-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-01 | 1990-07-03 | 1991-01-02 | $7700.00 | Window Closed / Lapsed |