US4207377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite zinc oxide coating on an inert pigment core
Assignee: Sherwin Williams Co
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Filing: 1977-12-12
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Granted: 1980-06-10
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Expires: 1997-12-12
Abstract
Abstract This invention relates to a novel composite pigment and method for its manufacture which comprises a finely-divided inert pigment as a core which has deposited on its surface a non-photoconductive grade of zinc oxide, the weight ratio of zinc oxide ranging from about 30% to about 80% of the total weight of the composite pigment and the composite pigment characterized by a specific surface in excess of about 10 square meters/gram. In rubber compounding, the composite pigment reduces the cost of the zinc essential to produce quality products and the composite pigment because it is itself photoconductive is of utility in photoconductive end uses.
Inventors
- 👤 Robert H. Kindrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:04
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/02; B; B82; B82Y; B82Y30/00; C09; C09C; C09C3/00; C09C3/06; C09C3/063; G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/08; C01; C01P; C01P2002/00; C01P2002/70; C01P2002/74; C01P2002/80; C01P2002/84; C01P2002/85; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/64; C01P2004/80; C01P2004/82; C01P2004/84; C01P2006/00; C01P2006/10; C01P2006/12; C01P2006/80; C01P2006/90; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
51 words
A composite zinc oxide coated inorganic pigmentary inert core product comprising lamellar crystals of zinc oxide extending outwardly from and substantially about the surface of said core, said crystals in sufficient concentration to provide a specific surface area of said composite product of in excess of ten square meters per gram.
Claim 2
Dependent Claim
51 words
A composite zinc oxide coated inorganic pigmentary inert core product comprising lamellar crystals of zinc oxide extending outwardly from and substantially about the surface of said core, said crystals in sufficient concentration to provide a specific surface area of said composite product of in excess of ten square meters per gram.
Claim 3
Dependent Claim
10 words
A rubber compounded with the composite pigment of claim 1.
Claim 4
Dependent Claim
20 words
The composite pigment of claim 1 wherein the zinc oxide is from 30% to 80% of the total pigment weight.
Claim 5
Dependent Claim
20 words
The composite pigment of claim 1 wherein the zinc oxide is from 45% to 65% of the total pigment weight.
Claim 6
Dependent Claim
28 words
The composite pigment of claim 1 wherein the specific surface area of said composite product is in the range of from ten to 60 square meter per gram.
Claim 7
Dependent Claim
13 words
The composite pigment of claim 1 wherein the inert inner core is clay.
Claim 8
Dependent Claim
13 words
The composite pigment of claim 1 wherein the inert inner core is talc.
Claim 9
Dependent Claim
14 words
The composite pigment of claim 1 wherein the inert inner core is calcium carbonate.
Claim 10
Dependent Claim
15 words
The composite pigmentary product of claim 1 where the inert inner core is silicon dioxide.
Claim 11
Dependent Claim
43 words
The composite pigment of claim 9 wherein the zinc oxide extending outwardly from and substantially about the surface of said core is sufficiently crystallized and said crystals are in sufficient concentration to permit transmission of U.V. light to the zinc oxide-inert core interface.
Claim 12
Dependent Claim
25 words
The composite pigment of claim 9 wherein the zinc oxide crystals about the silica core have minor amounts of basic zinc sulfate in association therewith.
Claim 13
Dependent Claim
11 words
A photoreproductive coating composition containing the composite pigment of claim 6.
Claim 14
Dependent Claim
11 words
A photoreproductive copy paper coated with the composition of claim 12.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-10 | 1983-12-10 | 1984-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-10 | 1987-12-10 | 1988-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-10 | 1991-12-10 | 1992-06-10 | $7700.00 | Window Closed / Lapsed |