PP Clarifier Gets FDA Approval for Higher Concentration

WEB EXCLUSIVE A high-performance clarifier for polypropylene launched last year, recently received FDA approval for use in higher concentration.

WEB EXCLUSIVE A high-performance clarifier for polypropylene launched last year, recently received FDA approval for use in higher concentration. Irgaclear XT 386 from Ciba Specialty Chemicals, Tarrytown, N.Y., can now be used at concentration of up to 250 ppm in PP random copolymers and homopolymers. The extended upper limit applies to all conditions of use from high (A) to low temperature (H), as well as in all food contact applications. As previously reported, XT 386 is based on a new chemistry—trisamides, rather than sorbitol--that reportedly allows for major cost reduction.Use levels to reduce haze and increase clarity of PP are said to be less than 10% of those for conventional products—i.e., 150 ppm vs. 2000 ppm. It is best suited to random copolymers for thin-wall injection molding of food containers and stretch-blow molding of bottles. Its thermal stability of more than 380 C prevents the generation and potential migration of undesired chemicals, during processing and under challenging conditions such as microwave food reheating. Says product manager Vincent Gugumus, “With its ultra-low migratory system, Irgaclear XT 386 is recommended in amounts as small as 150 to 200 ppm. The 250-ppm extended upper limit therefore more than adequately allows for qualification of clarified PP for FDA-approved food contact applications.” (800) 431-2360 * www.cibasc.com