NEW YORK (AP) — Dow Chemical Co. said Wednesday it will close three Louisiana plants as part of a shift away from basic chemicals toward the lucrative business of specialty chemicals.

The shuttering comes as part of a massive plan to cut costs after Dow bought rival Rohm & Haas in April for more than $16 billion, a deal that added massive amounts of debt to its balance sheet.

Dow expects to take a $700 million second-quarter charge as part of Wednesday's announcement, but expects to cut costs by about $100 million a year.

The approximately 100 people who work at the plants will be offered jobs elsewhere, Dow said.

The plants make ethylene, a building block for basic chemicals like plastic and packaging. The basic chemicals market is heavily affected by price fluctuations in crude, and products are usually made and sold in large batches and at razor-thin profits.

Dow is essentially saying it won't buy ethylene from other suppliers anymore. It had bought about 3 billion pounds a year.

Specialty chemicals — which are used in products like cosmetics and food additives — tend to be made in smaller batches, and are more profitable.

Rohm & Haas was a big player in the specialty chemicals market and Dow paid top dollar to get it. The bid was also made just as the global economy slumped and demand for chemicals evaporated.