By Liz White, UT staffParis-Rhodia Coatis has raised prices for its hexamethylene diisocyanate (HDI) and isophorone diisocyanate (IPDI) monomers and derivatives by 10 to 12 percent. The price rise, which took effect 1 Dec, is needed, said a Rhodia Coatis statement, to "help respond to the continuously rising cost of energy and raw materials, and to the significant erosion of margins."These effects coincide, the group pointed out, when global demand for aliphatic isocyanates is "strengthening worldwide." Rhodia claims to have been proactive in raising productivity, lowering manufacturing and operating costs. And it said it is continuing to sustain these efforts while keeping manufacturing quality up and promoting sustainable development. Under current circumstances, Rhodia added, "these efforts are inadequate to overcome the cost pressure." Rhodia Coatis' aliphatic isocyanates are used in high-performance coatings, with major outlets in automotive OEM and car refinish, wood, can and coil coatings, as well as in transport, aerospace and general industry. "