11.   For decades, Buna made its chemicals from coal, an expensive, polluting process that has now been shut down.

12.   He said the company wants to buy Master Builders, a unit of Sandoz AG that makes construction chemicals.

13.   He said the other target was a factory in Khartoum, the Sudanese capital, that was used to make chemicals for nerve gas.

14.   Hercules, based in Wilmington, Delaware, makes specialty chemicals, flavors, fragrances, food gums and films.

15.   If it made poisonous chemicals, it also made medicines for Sudan.

16.   It also makes specialty chemicals that are used in flavors and fragrances.

17.   It makes basic chemicals such as ethylene and propylene, which are used in a wide variety of consumer products.

18.   MBT makes construction chemicals.

19.   Methanol is used in making other chemicals, such as formaldehyde, acetic acid and an additive for cleaner-burning gasoline.

20.   NL Industries, which makes specialty chemicals, is based in Houston, Texas.