With this acquisition, NPL's total stake will increase to 70.5 per cent from the current 45.4 per cent.
"The Agreement dated March 28, 2017 was executed by Nusli N Wadia and Nowrosjee Wadia and Songs Ltd to acquire 14,42,500 equity shares from Solvay SA," NPL said in a BSE filing today.
The company is still awaiting full details of the acquisition, it added.
In a separate statement, Mumbai-based global M&A advisory firm Singhi Advisors, which was the sole banker to the transaction, said the NPL has agreed to buy additional 25.1 per cent in the company from Solvay SA.
NPL manufactures specialty chemicals like hydrogen peroxide, sodium perborate and hydrogen gas. It has a production unit at Kalyan, near Mumbai with a capacity of PL, 95,000 tonnes per annum.