Trinseo's Berwyn operating headquarters has 62 employees, a spokeswoman said.
The net proceeds of an estimated $161.5 million - based on an IPO price of $18 per share - will be used to retire $132.5 million in debt, as well as to pay fees related to the offering and for general corporate purposes, the company said.
At the end of March, Trinseo had total debt of $1.34 billion, which means the company will remain heavily indebted after the IPO, its prospectus said.
Last year, Trinseo had $5.3 billion in revenue - 60 percent of that from Europe - and a net loss of $22.2 million. Trinseo's biggest end markets are paper, tires, and automotive products, according a filing with the Securities and Exchange Commission.
Four years ago, Dow Chemical Co. sold what is now Trinseo to Bain Capital Partners L.L.C. for $1.63 billion. Shortly thereafter, Bain announced the move of the business' headquarters to Berwyn from Midland, Mich., saying it wanted to establish a separate identity from Dow, which in 2009 bought Rohm & Haas Co. for about $16 billion.
Trinseo's president and chief executive is Christopher D. Pappas, who had the same positions at Nova Chemical. Stephen M. Zide, a managing director of Bain Capital Investors L.L.C., has been Trinseo's chairman since the leveraged buyout from Dow.