Titanium dioxide pigment coated with hollow bodies and...

Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...

Reexamination Certificate

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C427S215000, C427S218000, C427S439000, C428S403000, C428S537500

Reexamination Certificate

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11710665

ABSTRACT:
A coated titanium dioxide pigment with good opacity and simultaneously good retention for use in decorative laminating paper characterized by a surface coating containing aluminum oxide phosphate and attached hollow bodies, e.g., hollow microbodies. A manufacturing method is characterized in that an aluminum containing component and a phosphorus containing component are first added to a TiO2suspension, during which time the pH value does not drop below 10. The hollow bodies are subsequently added, followed by addition of at least one acidic component, as a result of which the pH value of the suspension is lowered to the range from about 4 to 9. In an alternative embodiment of the method, the suspension has a pH value of under 4 at the time of addition of the aluminum containing component and a phosphorus containing component.

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patent: 5886069 (1999-03-01), Bolt
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patent: 6962622 (2005-11-01), Bender et al.
patent: 2003/0024437 (2003-02-01), Wen et al.
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patent: WO 02/74431 (2002-03-01), None
Caruso, et al., Nanoengineering of Inorganic and Hybrid Hollow Spheres by Colloidal Templating, SCIENCE, Nov. 6, 1998, 1111-1114, vol. 282, USA.
McDonald et al., Hollow Latex Particles: Synthesis and Applications, Advances in Colloid and Interface Science, 2002, 181-213, 99, The Dow Chemical Co., Midland, MI.
Qualitatsverbesserung, Phanomen Farbe, Dec. 1998+Jan. 1999, 39-43, Germany.

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