Philadelphia chemical giant Rohm and Haas Co. said today it will raise prices on certain acrylic and styrene acylic polymers 4 to 7 percent on Jan. 1 in the United States and Canada.

The company also said it would raise prices on all acrylic emulsions, styrene-containing polymers and additives sold in the paint market in North America.

Escalating oil and petrochemical costs are leading to the price hikes, the company said.

Rohm and Haas shares were down 49 cents, to $54.70 in midday trading on the New York Stock Exchange.