SAN FRANCISCO — A federal judge seemed unmoved Thursday by declarations from 400 Uber drivers who say they like being independent contractors, suggesting the headline-grabbing tactic won’t be enough to defeat class certification in a case that threatens to force the company to overhaul its entire business model.

U.S. District Judge Edward Chen of the Northern District of California said he’s not convinced Uber Technologies Inc.’s driver survey proves the majority of drivers object to a lawsuit that seeks to provide them with minimum wage and other benefits guaranteed to employees.