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AKRON, OHIO — Escalation of feedstock costs has led two producers of unsaturated polyester resin to announce price increases.

Cook Composites and Polymers of Kansas City, Mo., and Interplastic Corp. of St. Paul, Minn., both issued news releases last week regarding price changes.

Prices on all CCP polyester resins and gel coats will increase by 2 cents a pound, said Scott Kaphingst, director of marketing. Prices are effective Feb. 23, he said.

Kaphingst attributes the increase to a rise in the cost of raw materials such as styrene monomer, glycols, maleic and phthalic anhydride and titanium dioxide.

Interplastic said it will increase prices 2-4 cents a pound on all UP resins, including specialty and vinyl ester resins, said Peter DiPietro, national sales manager for the firm's Commercial Resins Division. Price changes also will affect the Silmar Resins Division, the company said. DiPietro cited higher raw material costs as the reason for the increases, which are effective Feb. 15.

Earlier this month, Reichhold Chemicals Inc. of Research Triangle Park, N.C., announced a 2-3 cent-per-pound increase for its unsaturated polyester products, effective Feb. 1.