Chemtura Corp., Philadelphia, said today it is raising prices on some of its products by up to 25 percent, effective in January.

It is the second price hike announced this week by the maker of specialty chemicals as the cost of its raw materials rises.

The latest increase affects Chemtura's bromine and bromine-based derivatives, which are used in rubber, soaps, medications, flavors and fragrances.

The earlier increase - up to 15 percent - was for chemicals that slow degradation of products exposed to sunlight.    - Paul Schweizer