New PP Clarifiers/Nucleators Challenge Industry Workhorse.* Two additives based on new nucleator chemistry from Japan offer molders and thermoformers of polypropylene new tools for improving productivity. They also offer sparkling clarity in PP packaging. The supplier's data show performance exceeding that of the industry leaders, sorbitol-based Millad 3998, 3940, and 3905 from Milliken Chemical, Spartanburg, S.C. Based on a complex organophosphate organophosphate /or·ga·no·phos·phate/ (or?gah-no-fos´fat) an organic ester of phosphoric or thiophosphoric acid; such compounds are powerful acetylcholinesterase inhibitors and are used as insecticides and nerve gases. metal salt, ADK ADK Adirondack Mountain Club ADK Archive Development Kit (SAP archiving) ADK Additional Decryption Key ADK Aggressors of Dark Kombat (video game) NA-11 and NA-21 are available from Amfine Chemical Corp., Allendale, N.J., the North American North American named after North America. North American blastomycosis see North American blastomycosis. North American cattle tick see boophilusannulatus. joint venture of Asahi Denka Kogyo K.K. and Mitsubishi Corp. The nucleating/clarifying additives are currently toll manufactured or imported from Japan. Next July, Amfine will start manufacturing them in Hopkinsville, Ky. PP runs clearer, faster NA-21 is being reviewed by the FDA FDA abbr. Food and Drug Administration FDA, n.pr See Food and Drug Administration. FDA, n.pr the abbreviation for the Food and Drug Administration. for food-contact uses, whereas NA-11 is already approved for use at up to 0.3%. At just 0.1%, both products are said to improve PP properties such as flexural flexural pertaining to the flexure of a joint. flexural deformity fixation of joints in flexion. In the newborn called contracted calves or foals. modulus, HDT HDT Heat Deflection Temperature (plastics) HDT High Dose Therapy HDT Heatpipe Direct Touch (Xigmatek) HDT Heat Distortion Temperature (plastics) HDT Henry David Thoreau , impact strength, and scratch or abrasion resistance. For example, 0.1% of NA-11 raises the flexural modulus of PP copolymer copolymer: see polymer. from 122,500 psi to 142,000 psi. The same loading of Millad 3998 reportedly yields a modulus of 134,000 psi. At these loadings, NA-21 reportedly also provides high clarity, especially in thin-wall PP parts. As a clarifier, it outperforms both NA-11 and Millad 3988 (see graphs). Commercial uses in Japan include thermoformed single-serve food packages and injection molded food-storage containers. Amfine general manager Peter Goman says this chemical class of nucleator/clarifier is also preferred in Japan for medical products and liquid packaging that need good extraction resistance. NA-21 has also been used in large injection molded auto parts where its modest rate of crystallization Crystallization The formation of a solid from a solution, melt, vapor, or a different solid phase. Crystallization from solution is an important industrial operation because of the large number of materials marketed as crystalline particles. leads to good dimensional stability. On the other hand, NA-11 induces faster crystallization at higher temperatures. For example, in PP homopolymer, Amfine reports a crystallization temperature of 275 F with NA-11, versus 270 F for NA-21 and about 252 F for Millad 3988. As a result, NA-11 looks best for reducing cycle times in injection molding and thermoforming. Clarity of PP Random Copolymer with ADK NA-21 Versus Industry Standard
Haze, %
None
ADK NA-21 0.1%
ADK NA-21 0.3%
Millad 3988 0.1%
Millad 3988 0.3%
Transparency of PP Homoploymer with Amfine Nucleating Agents
Haze, %
None
ADK NA-11 0.1%
ADK NA-21 0.1%
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