Titanium dioxide pigment coated with hollow bodies and method for its manufacture
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United States of America Patent
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Oct 30, 2007
Grant Date -
Sep 20, 2007
app pub date -
Feb 23, 2007
filing date -
Mar 16, 2006
priority date (Note) -
Expired
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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 TiO.sub.2 suspension, 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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