US4552593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of effect pigments coated with metal oxides
Assignee: BASF SE
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Filing: 1983-10-03
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Granted: 1985-11-12
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Expires: 2003-10-03
Abstract
Abstract Effect pigments are prepared by a process in which a pigment substrate comprising flaky particles, of which from 10 to 90% by weight have a longest dimension of from 60 to 400 μm and the remainder have a longest dimension of from 3 to 30 μm, are treated, in a fluidized bed, with one or more metal chlorides and steam in the gas phase, at elevated temperatures. During this procedure, the particles are coated with metal oxide. After coating, the fraction having a particle size of from 3 to 30 μm is separated off as the effect pigment. The coatings obtained adhere very firmly to the flaky particles. The pigments are used for coloring finishes, plastics, cosmetic products and glasses.
Inventors
- 👤 Werner Ostertag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:12
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0015; C09C1/0024; C09C1/0021; C09C3/00; C09C3/06; C09C3/063; C01; C01P; C01P2002/00; C01P2002/50; C01P2002/52; C09C2200/00; C09C2200/10; C09C2200/102; C09C2220/00; C09C2220/20
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
108 words
A process for the preparation of an effect pigment, wherein (i) a pigment substrate comprising flaky particles, of which from 10 to 90% by weight have a longest dimension of 60-400 μm and the remainder have a longest dimension of from 3 to 30 μm, is fluidized in a fluidized bed, (ii) the particles are simultaneously treated at elevated temperatures with one or more metal chlorides and steam in the gas phase, where the particles are coated by hydrolysis of the metal chlorides, and (iii) after coating, that fraction which has a longest particle dimension of from 3 to 30 μm is separated off as the effect pigment.
Claim 2
Dependent Claim
108 words
A process for the preparation of an effect pigment, wherein (i) a pigment substrate comprising flaky particles, of which from 10 to 90% by weight have a longest dimension of 60-400 μm and the remainder have a longest dimension of from 3 to 30 μm, is fluidized in a fluidized bed, (ii) the particles are simultaneously treated at elevated temperatures with one or more metal chlorides and steam in the gas phase, where the particles are coated by hydrolysis of the metal chlorides, and (iii) after coating, that fraction which has a longest particle dimension of from 3 to 30 μm is separated off as the effect pigment.
Claim 3
Dependent Claim
45 words
A process as claimed in claim 1, wherein the pigment substrate comprises flaky particles of which from 10 to 90% by weight have a longest dimension of from 90 to 150 μm and the remainder have a longest dimension of from 5 to 25 μm.
Claim 4
Dependent Claim
30 words
A process as claimed in claim 1, wherein the metal chloride used is titanium(IV) chloride or a mixture consisting predominantly of titanium(IV) chloride, or is tin(IV) chloride or iron(III) chloride.
Claim 5
Dependent Claim
30 words
A process as claimed in claim 2, wherein the metal chloride used is titanium(IV) chloride or a mixture consisting predominantly of titanium(IV) chloride, or is tin(IV) chloride or iron(III) chloride.
Claim 6
Dependent Claim
25 words
A process as claimed in claim 1, wherein the treatment with the metal chloride and steam is carried out at from 200° to 500° C.
Claim 7
Dependent Claim
25 words
A process as claimed in claim 4, wherein the treatment with the metal chloride and steam is carried out at from 200° to 500° C.
Claim 8
Dependent Claim
23 words
A process as claimed in claim 5, wherein the metal chloride used is titanium(IV) chloride or a mixture consisting predominantly of titanium(IV) chloride.
Claim 9
Dependent Claim
23 words
A process as claimed in claim 6, wherein the metal chloride used is titanium(IV) chloride or a mixture consisting predominantly of titanium(IV) chloride.
Claim 10
Dependent Claim
115 words
A process for the preparation of an effect pigment wherein (i) as the pigment substrate, mica flakes, of which from 10 to 90% by weight have a longest particle dimension of from 60 to 400 μm and the remainder have a longest dimension of from 3 to 30 μm, are fluidized in a fluidized bed, (ii) the fluidized particles are simultaneously treated at from 200° to 500° with one or more metal chlorides and steam in the gas phase, where the particles are coated by hydrolysis of the metal chlorides and (iii) after coating, that fraction which has a longest particle dimension of from 3 to 30 μm is separated off as the effect pigment.
Claim 11
Dependent Claim
115 words
A process for the preparation of an effect pigment wherein (i) as the pigment substrate, mica flakes, of which from 10 to 90% by weight have a longest particle dimension of from 60 to 400 μm and the remainder have a longest dimension of from 3 to 30 μm, are fluidized in a fluidized bed, (ii) the fluidized particles are simultaneously treated at from 200° to 500° with one or more metal chlorides and steam in the gas phase, where the particles are coated by hydrolysis of the metal chlorides and (iii) after coating, that fraction which has a longest particle dimension of from 3 to 30 μm is separated off as the effect pigment.
Claim 12
Dependent Claim
41 words
A process as claimed in claim 9, wherein from 10 to 90% by weight of the mica flakes have a longest dimension of from 60 to 400 μm and the remainder have a longest dimension of from 5 to 25 μm.
Claim 13
Dependent Claim
24 words
A process as claimed in claim 9, wherein the metal chloride used is tin(IV) chloride, iron(III) chloride, titanium(IV) chloride or a mixture of these.
Claim 14
Dependent Claim
15 words
A process as claimed in claim 9, wherein the metal chloride used is titanium(IV) chloride.
Claim 15
Dependent Claim
27 words
A process as claimed in claim 9, wherein the pigment substrate is coated once or several times with the same metal chloride or with different metal chlorides.
Claim 16
Dependent Claim
36 words
A process as claimed in claim 9, wherein the pigment substrate is treated with a mixture of a metal chloride and a metal carbonyl in the presence of steam and of oxygen in the gas phase.
Claim 17
Dependent Claim
56 words
A process as claimed in claim 9, wherein the coated substrate is then additionally coated with aluminum oxide, silicon dioxide, phosphorus pentoxide or a mixture of these oxides by reaction of aluminum chloride, silicon(IV) chloride, phosphorus trichloride or a mixture of these chlorides in the gas phase with steam, in the presence or absence of oxygen.
Claim 18
Dependent Claim
37 words
A process as claimed in claim 14, wherein the substrate treated with titanium(IV) chloride and steam is then treated with iron pentacarbonyl, in the presence of oxygen, in the gas phase at from 200° to 500° C.
Claim 19
Dependent Claim
20 words
A process as claimed in claim 16, wherein the coated pigment substrate is heated at from 400° to 1,200° C.
Claim 20
Dependent Claim
12 words
An effect pigment obtained by a process as claimed in claim 9.
References Cited (Backward Citations)
US3087827A
Cited
US3087828A
Cited
US3342617A
Cited
US3582382A
Cited
US3711308A
Cited
US3650790A
Cited
US4038099A
Cited
US3874890A
Cited
DE2454138A1
Cited
US4086100A
Cited
US4146403A
Cited
US4134776A
Cited
US4344987A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-11 | 1989-05-13 | 1989-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-11 | 1993-05-13 | 1993-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-11 | 1997-05-13 | 1997-11-12 | $7700.00 | Window Closed / Lapsed |