US4828623A
Expired / Lapsed
US
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Water resistant nacreous pigment and process for producing the same
Assignee: Merck Patent GmbH
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Filing: 1987-11-20
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Granted: 1989-05-09
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Expires: 2007-11-20
Abstract
Abstract A process for the production of a water-resistant nacreous pigment, comprising hydrolyzing a zirconium or zirconyl compound, in the presence of a hypophosphite and in the presence of a metal oxide-coated mica flake pigment, whereby a hydrated zirconium oxide is deposited onto the surface of the metal oxide-coated mica flake, and a nacreous pigment comprising metal oxide-coated mica flakes coated with hydrated zirconium oxide.
Inventors
- 👤 Katsuhisa Nitta
- 👤 Takaji Watanabe
- 👤 Isao Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:15
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/36; C09C; C09C1/00; C09C1/0015; C01; C01P; C01P2004/00; C01P2004/20; C01P2004/80; C01P2004/82; C01P2004/84; C09C2200/00; C09C2200/10; C09C2200/102; C09C2200/30; C09C2200/301; C09C2200/40; C09C2200/401; C09C2200/402; C09C2200/407; C09C2200/408
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
50 words
A process for the production of a water-resistant nacreous pigment, comprising hydrolyzing a zirconium or zirconyl compound, in the presence of a hypophosphite and in the presence of a metal oxide-coated mica flake pigment, whereby a hydrated zirconium oxide is deposited onto the surface of the metal oxide-coated mica flake.
Claim 2
Dependent Claim
50 words
A process for the production of a water-resistant nacreous pigment, comprising hydrolyzing a zirconium or zirconyl compound, in the presence of a hypophosphite and in the presence of a metal oxide-coated mica flake pigment, whereby a hydrated zirconium oxide is deposited onto the surface of the metal oxide-coated mica flake.
Claim 3
Dependent Claim
62 words
A process according to claim 1, wherein a salt of hypophosphorous acid and a salt capable of forming zirconium oxide under hydrolysis conditions are dissolved in an aqueous slurry of a metal oxide-coated mica flake pigment, and the salt capable of forming zirconium oxide is hydrolyzed so as to deposit hydrated zirconium oxide onto the surface of the metal oxide-coated mica flake.
Claim 4
Dependent Claim
37 words
A process according to claim 1, wherein the pigment is a mica flake coated with a titanium oxide, an iron oxide, a tin oxide, a chromium oxide, a zirconium oxide, or with a mixture of said oxides.
Claim 5
Dependent Claim
24 words
A process according to claim 1, wherein the mica flakes have a diameter of about 2-200 μm and a thickness of about 0.2-0.9 μm.
Claim 6
Dependent Claim
55 words
A process according to claim 2, wherein the salt capable of forming zirconium oxide is ZrCl 4 , Zr(NO 3 ) 4 .5H 2 O, Zr(SO 4 ) 2 .4H 2 O, ZrOCl 2 .H 2 O, ZrO(NO 3 ) 2 .2H 2 O, ZrOSO 4 .4H 2 O or ZrO(CH 3 COO) 2 .
Claim 7
Dependent Claim
84 words
A process according to claim 2, wherein salt of hypophosphorous acid is HPH 2 O 2 NaH 2 PO 2 .H 2 O, (NH 4 )H 2 PO 2 , KH 2 PO 2 , Ca(H 2 PO 2 ) 2 , Mg(H 2 PO 2 ) 2 , Co(H 2 PO 2 ) 2 .6H 2 O, Mn(H 2 PO 2 ) 2 .H 2 O, Zn(H 2 PO 2 ) 2 .6H 2 O or Pb(H 2 PO 2 ) 2 .
Claim 8
Dependent Claim
34 words
A process according to claim 2, wherein the salt capable of forming zirconium oxide is ZrOCl 2 .H 2 O and the salt of hypophosphorous acid is NaH 2 PO 2 .H 2 O.
Claim 9
Dependent Claim
17 words
A process according to claim 2, wherein the aqueous slurry contains 5-15% by weight of the pigment.
Claim 10
Dependent Claim
26 words
A process according to claim 2, wherein the salt capable of forming zirconium oxide is present in an amount of about 0.01-0.05 mol/100 g of pigment.
Claim 11
Dependent Claim
18 words
A process according to claim 2, wherein the ratio of phosphite/zirconium ions in the slurry is about 1:2-10:1.
Claim 12
Dependent Claim
20 words
A process according to claim 2, wherein the temperature of the slurry is about 50° C. - slurry boiling point.
Claim 13
Dependent Claim
39 words
A process according to claim 2, wherein a silane coupling agent in aqueous solution is added under stirring to a resultant aqueous slurry containing the metal oxide-containing mica flake pigment having hydrated zirconium oxide deposited on the surface thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |