US5501732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing silanized TiO2 pigments using a media mill
Assignee: EIDP Inc
•
Filing: 1995-02-23
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Granted: 1996-03-26
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Expires: 2015-02-23
Abstract
Abstract Disclosed is an improved process for preparing a silanized TiO 2 pigment by media milling.
Inventors
- 👤 Philipp M. Niedenzu
- 👤 Scott M. Herkimer
- 👤 Ronald L. Chaney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:40
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/36; C09C1/3607; C09C1/3684; C01; C01P; C01P2004/00; C01P2004/50; C01P2004/51; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/22; C01P2006/60; C01P2006/80
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
64 words
A process for preparing a high solids TiO 2 pigment comprising the steps of: (a) reducing the viscosity of a high solids TiO 2 pigment slurry by adjusting the pH in the range of about 7.5 to about 11; (b) media milling the slurry; (c) contacting the slurry with an organosilicon reagent; and (d) drying the slurry to less than 1 wt. % water.
Claim 2
Dependent Claim
64 words
A process for preparing a high solids TiO 2 pigment comprising the steps of: (a) reducing the viscosity of a high solids TiO 2 pigment slurry by adjusting the pH in the range of about 7.5 to about 11; (b) media milling the slurry; (c) contacting the slurry with an organosilicon reagent; and (d) drying the slurry to less than 1 wt. % water.
Claim 3
Dependent Claim
34 words
The process of claim 1, wherein the viscosity is reduced by contacting the slurry with a reducent selected from the group consisting of triethanol amine, 2-amino-2-methyl-1-propanol, trimethylol propane and tetrapotassium pyrophosphate and mixtures thereof.
Claim 4
Dependent Claim
75 words
The process of claim 1 or claim 2, wherein the organosilicon reagent has the formula: R.sub.x Si(R').sub.4-x wherein R is nonhydrolyzable aliphatic, cycloaliphatic or aromatic group having at least 1 to about 50 carbon atoms; R' is a hydrolyzable group selected from alkoxy, halogen, acetoxy, hydroxy and mixtures thereof; and x=1 to 3, and is present in the amount of about 0.1 to about 5% by weight, based on the weight of TiO 2 .
Claim 5
Dependent Claim
24 words
The process of claim 3 wherein the organosilicon reagent is fluorine substituted and R=C n F 2n+1 wherein n=8, 10, 12 or mixtures thereof.
Claim 6
Dependent Claim
31 words
The process of claim 3 or claim 4 wherein the organosilicon reagent further comprises a polysiloxane having the formula: (R.sub.n SiO.sub.4-n/2).sub.m wherein R is organic or inorganic group; n=0-3; and m≧2.
Claim 7
Dependent Claim
28 words
The process of claim 3 or claim 4 wherein the organosilicon reagent is selected from the group consisting of vinyltriethoxysilane, butyltrimethoxysilane, hexyltrimethoxysilane, octyltriethoxysilane, nonyltriethoxysilane, trichloroperfluoroethylsilane, trichloroperfluorodecylsilane and trichloroperfluorododecylsilane.
Claim 8
Dependent Claim
24 words
The process of claim 5 wherein the organosilicon reagent is selected from the group consisting of polydimethylsiloxane, vinylphenylmethyl terminated dimethylsiloxanes, divinylmethyl terminated and polydimethylsiloxane.
Claim 9
Dependent Claim
15 words
The process of claim 3, further comprising: (e) media milling the slurry after step (c).
References Cited (Backward Citations)
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US3915735A
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US4141751A
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JPS5899121A
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JPS60210521A
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US4989794A
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US5083712A
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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) | 1999-03-26 | 1999-09-25 | 2000-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-26 | 2003-09-25 | 2004-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-26 | 2007-09-25 | 2008-03-26 | $7700.00 | Window Closed / Lapsed |