"Economic patriotism is the mobilisation of all the participants, of all those concerned, the shareholders but also the company bosses," Villepin told France 2 television on Tuesday.
His comments came as European resistance mounted to the
18.6bn-euro ($22.7bn) bid by Mittal Steel, the world's biggest producer, to seize control of Arcelor, a steel group that is one of the continent's cherished industrial champions.
"Think about the structure of your capital, it should be sufficiently organised to resist attacks," Villepin said, addressing company directors and adding that "the state can help in this movement".
But the call for "economic patriotism" is being seriously challenged by Mittal's bid to swallow up Arcelor, which is not a French-only company, having been formed four years ago by the merger of three steelmakers - Luxembourg's Arbed, Spain's Aceralia and France's Usinor.
Arcelor warned against its predator's "irregular" profitability, pledging to consider "all options" to foil the hostile bid.
Neelie Kroes, the European Competition commissioner, said on Tuesday she would examine the takeover bid "on competition grounds and on competition grounds only" and "not on any other ground".
The principal fear is that the Mittal deal could lead to plant closures and job cuts in the various European countries where
Arcelor has plants.
But Lakshmi Mittal, Mittal Steel Co's chairman and CEO, has opened up a charm offensive to calm government jitters over his $22.5 billion unsolicited offer for Arcelor SA.
Villepin has urged French firms
to reorganise their capital
On a visit to Paris on Monday, Mittal, 55, pledged to create a European champion, protect European jobs and respect European labour conditions.
Mittal said: "Mittal is committed to the social policies and commitments that Arcelor has implemented. Regarding employment, this merger is not about job reductions."
On Tuesday, the London-based steel boss was scheduled to meet Jean-Claude Juncker, the prime minister of Luxembourg, whose government is the largest shareholder in Arcelor with a 5.6% stake.
Juncker is also set to discuss the takeover bid at a meeting with Jacques Chirac, the French president, on Wednesday, when Mittal will meet Belgian authorities and the EU's competition commissioner to discuss his plans for Arcelor.
Third richest man
Mittal - ranked the third richest man on the planet by Forbes magazine - was speaking at a Paris news conference after meeting Thierry Breton, the French finance minister.
Breton said he had still to be convinced that a tie-up between the world's top two steel companies would be risk-free for France, where Arcelor employs 30,000 workers.
Arcelor is Europe's biggest
supplier of high-grade steel
Mittal Steel had "no industrial plan on the table" to explain how the takeover would work, the minister said.
"Without any information at this stage, we can only reiterate our deep concern."
Mittal sidestepped questions about whether the deal could go ahead against government opposition. "I do not see the reason why the government will not accept this."
The takeover bid, announced on Friday, would create a new company with almost 350,000 employees at 61 plants in 27 countries, but with few areas of overlap that could cause anti-trust problems.
Mittal Steel is the biggest US supplier of high-grade, high-margin auto steel; Arcelor occupies the same position in Europe.