Why would China it would be like throwing away money. They already couldn't compete with Asian shipyards.
Unless those companies have some awesome Intellectuel property China might find useful.
Looking at history, Chinese companies rarely purchase for intellectual property alone (except maybe brand name)
They have purchased a number of properties which were failing or failed and proceeded to make a business out of it.
When the Japanese consumer electronics companies were failing, it was because of the competition coming from China and Korea. The TV assembly plants they owned in Mexico were subsequently sold to Chinese companies (Panasonic to TCL, Sharp to Hisense). They can be profitable again for the new owners because of the supply chain restructuring.
Similarly, when GE appliances was sold to Haier the main GE company claimed that their Kentucky plant was losing hundreds of millions, yet Haier is happy to keep it open. Of course there is an element of good PR, but again, since Haier is so big, they can optimize the supply chain better.
Finally Nanjing Auto/SAIC tried very long to keep the Longbridge UK plant open (~10 years), but the reality was written long ago for UK car manufacturing (similar to Australian manufacturing). They also tried to keep open a technical office, but that also closed now (though I think that was for appearances).