US4874433A
Expired / Lapsed
US
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Methods of preparing encapsulated pigments
Assignee: Evonik Operations GmbH
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Filing: 1988-06-03
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Granted: 1989-10-17
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Expires: 2008-06-03
Abstract
Abstract Encapsulation pigments comprising chromophoric particles embedded in glaze-stable casings are prepared by means of calcination from the appropriate initial products. High yields and strong color intensities are obtained if the chromophoric substance or its initial compounds are bound in and/or to a zeolite and are calcined in this form with the remaining constituents.
Inventors
- 👤 Akos Kiss
- 👤 Peter Kleinschmit
- 👤 Juergen Hanich
- 👤 Guenter Halbritter
- 👤 Jenny Horst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:27
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0009; C09C1/0012; C01; C01P; C01P2002/00; C01P2002/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
64 words
A method of preparing encapsulated pigments comprising a chromophoric or color-bearing substance which is encapsulated in a transparent casing compound of a substance stable against chemical attacks and glass stream vitrification, said method comprising binding the chromophoric substance or its initial components in and/or to a zeolite, followed by mixing with the encapsulating substance or its initial components and subsequently calcining at 500° C.
Claim 2
Independent Claim
64 words
A method of preparing encapsulated pigments comprising a chromophoric or color-bearing substance which is encapsulated in a transparent casing compound of a substance stable against chemical attacks and glass stream vitrification, said method comprising binding the chromophoric substance or its initial components in and/or to a zeolite, followed by mixing with the encapsulating substance or its initial components and subsequently calcining at 500° C.
Claim 3
Dependent Claim
23 words
The method according to claim 1, wherein the zeolite has a SiO 2 /Al 2 O 3 ratio of from 1 and 10.
Claim 4
Dependent Claim
17 words
The method according to claim 1, wherein the average zeolite particle size is between 1 and 20μm.
Claim 5
Dependent Claim
22 words
The method according to claim 1, wherein zirconium oxide and silicon oxide are used to form zirconium silicate as the encapsulating substance.
Claim 6
Dependent Claim
24 words
The method according to claim 4, wherein in that the zirconium oxide particles and silicon oxide particles used are smaller than the zeolite particles.
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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) | 1992-10-16 | 1993-04-17 | 1993-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-16 | 1997-04-17 | 1997-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-16 | 2001-04-17 | 2001-10-17 | $7700.00 | Window Closed / Lapsed |