FRANKFURT German liquid crystal maker Merck KGaA (MRCG.DE) extended the offer period for its planned takeover of AZ Electronic Materials AZEM.L for a sixth time on Friday as it continues to seek Chinese antitrust approval.
The offer period has been extended to until 1200 GMT on May 2, Merck said in a statement.
It said China's Ministry of Commerce had "raised certain specific concerns that Merck is working with the Chinese authorities to address".
"Merck is confident that there will be a satisfactory explanation or solution to these concerns," it added.
The world's largest maker of liquid crystals used in TVs and tablet and smartphone screens agreed in December to buy AZ for $2.6 billion to expand its range of specialist chemicals for hi-tech gadgets.
AZ Electronic generates the bulk of its revenue in Asia. China's new-found clout in regulating global mergers is causing headaches for some companies seeking deals that need Beijing's approval.
Merck said it had received valid acceptances of the offer representing approximately 67.53 percent of AZ by 1200 GMT on April 18.
Merck in March lowered the minimum acceptance threshold among AZ shareholders to 75 percent from 95 percent once the deal had been approved in China.
BoA Merrill Lynch advised Merck on the deal, while Rothschild, Goldman Sachs and UBS advised AZ.
(Reporting by Victoria Bryan; Additional reporting by Ludwig Burger; editing by Jason Neely)