By Ernest Scheyder
NEW YORK (Reuters) - Chemicals giant DuPont <DD.N> sued a California company on Wednesday, alleging it sold proprietary information on a lucrative line of specialty paint to Chinese rivals.
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USA Performance Technology Inc somehow obtained secret materials on how DuPont produces titanium dioxide, a popular pigment used to make paints for cars, plastics and paper, DuPont said in a filing with the U.S. District Court, Northern District of California.
In the suit, DuPont said the defendants were "in the process of providing or have provided" specific details on its titanium dioxide production process to one or more of DuPont's competitors in China.
DuPont said it does not know how the trade secrets were stolen from its facilities.
"The investigation is ongoing," DuPont spokesman Dan Turner said.
A call to Oakland-based USA Performance was not immediately returned.
DuPont wants USA Performance, as well as employees Walter Liew and John Liu, to pay "an amount equal to double actual damages" as well as other fees.
DuPont declined to say the final amount it is ultimately seeking.
DuPont does not break out sales figures for individual products, but in 2010 the unit that contains Ti02 reported revenue of $6.32 billion.
DuPont shares fell 0.3 percent to $55.87 in post-market trading.
The case is E.I. Du Pont De Nemours and Company v. USA Performance Technology Inc, U.S. District Court, Northern District of California.
(Reporting by Ernest Scheyder; editing by Andre Grenon)