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FDA broadens food-contact use of additive
Additives for Polymers
MATERIALS ECC shows new surface treatments New technology for surface treatment of calcium carbonate, which improves the processing characteristics of plastics compounds by increasing their thermal conductivity, was shown by ECC International at the recent National Plastics Exposition, Chicago, USA. Two new types of CaCO, concentrate were introduced: FilmLink, for polyolefin films (especially linear films) and Zytocal, for injection moulded and blow moulded polyolefins. FilmLink is a highly loaded concentrate (>60% by weight), allowing addition levels of 1525%, and acting as both a blocking agent and as a processing aid. The increased thermal conductivity of the blown film bubble improves its stability and is particularly effective in metallocene-based linear low density polyethylenes, where it compensates for the characteristic processing deficiency. It can also increase strength of the film, so permitting down-gauging. Zytocal has been developed to reduce cycle times in injection moulding and blow moulding polyolefins. Comprising 90% CaCO,, at 15-20% addition levels it increases the thermal conductivity of the compound, so reducing cooling time. Moulding cycles can be reduced by 15-40%, claims ECC. Contact: ECC International plc, John Keay .House, St Austell PL25 4DJ, UK; tel: +4&1726 74482; fax: +44-I726 623019
FDA broadens food-contact use of additive Application levels of GE Specialty Chemicals’ Ultranox 641 stabilizer, which contains up to 1.0% TIPA, in contact with food have been broadened by the US Food and Drug Administration. It may now be used up to a level not exceeding 0.1% by weight of resin in polypropylene resins and in linear low
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September I997
density polyethylene film in contact with food, including fatty foods, under conditions of use ‘C’ (up to a use temperature of 65”C/150”F). In linear low density polyethylene film the level is prescribed up to a maximum thickness of 0.075 mm (3 mil). The additive can still be used at levels not exceeding 0.2% by resin weight, without thickness restrictions, in polypropylene and linear low density and high density polyethylene resins, in contact with aqueous and aqueous-acidic foods only, under conditions of use ‘B’ (up to a use temperature of lOOV212”F). Contact: GE Specialty Chemicals Inc, PO Box 1868, 501 Avery Street, Parkersburg, WV26102-1868, USA; tel: + I-304 424 5698
New intermediate gives void-free urethane coatings An improved urethane intermediate for use in coatings, sealants and elastomers has been introduced by Baxenden Chemicals Ltd. Marketed under the name Trixene SC7906, it is a bisoxazolidine formulation, which hydrolyses on exposure to water or atmospheric moisture, offering four possible reaction sites. The reaction allows high-build void-free products to be formulated. It is designed for use in conjunction with Baxenden’s high-grade stripped prepolymers, giving a homogeneous product with good storage properties and blister-free surfaces. When combined with low monomer prepolymers, the properties of the coating or sealant can be varied by adjusting the amount of additive. Baxenden Chemicals Ltd, Speciality Chemicals Division, Paragon Works, Baxenden BB5 2SL, UK; tel:+44-1254 872278; &x:+44-1254 871247
0 1997 Elsevier Science
MATERIALS ECC shows new surface treatments New technology for surface treatment of calcium carbonate, which improves the processing characteristics of plastics compounds by increasing their thermal conductivity, was shown by ECC International at the recent National Plastics Exposition, Chicago, USA. Two new types of CaCO, concentrate were introduced: FilmLink, for polyolefin films (especially linear films) and Zytocal, for injection moulded and blow moulded polyolefins. FilmLink is a highly loaded concentrate (>60% by weight), allowing addition levels of 1525%, and acting as both a blocking agent and as a processing aid. The increased thermal conductivity of the blown film bubble improves its stability and is particularly effective in metallocene-based linear low density polyethylenes, where it compensates for the characteristic processing deficiency. It can also increase strength of the film, so permitting down-gauging. Zytocal has been developed to reduce cycle times in injection moulding and blow moulding polyolefins. Comprising 90% CaCO,, at 15-20% addition levels it increases the thermal conductivity of the compound, so reducing cooling time. Moulding cycles can be reduced by 15-40%, claims ECC. Contact: ECC International plc, John Keay .House, St Austell PL25 4DJ, UK; tel: +4&1726 74482; fax: +44-I726 623019
FDA broadens food-contact use of additive Application levels of GE Specialty Chemicals’ Ultranox 641 stabilizer, which contains up to 1.0% TIPA, in contact with food have been broadened by the US Food and Drug Administration. It may now be used up to a level not exceeding 0.1% by weight of resin in polypropylene resins and in linear low
2
September I997
density polyethylene film in contact with food, including fatty foods, under conditions of use ‘C’ (up to a use temperature of 65”C/150”F). In linear low density polyethylene film the level is prescribed up to a maximum thickness of 0.075 mm (3 mil). The additive can still be used at levels not exceeding 0.2% by resin weight, without thickness restrictions, in polypropylene and linear low density and high density polyethylene resins, in contact with aqueous and aqueous-acidic foods only, under conditions of use ‘B’ (up to a use temperature of lOOV212”F). Contact: GE Specialty Chemicals Inc, PO Box 1868, 501 Avery Street, Parkersburg, WV26102-1868, USA; tel: + I-304 424 5698
New intermediate gives void-free urethane coatings An improved urethane intermediate for use in coatings, sealants and elastomers has been introduced by Baxenden Chemicals Ltd. Marketed under the name Trixene SC7906, it is a bisoxazolidine formulation, which hydrolyses on exposure to water or atmospheric moisture, offering four possible reaction sites. The reaction allows high-build void-free products to be formulated. It is designed for use in conjunction with Baxenden’s high-grade stripped prepolymers, giving a homogeneous product with good storage properties and blister-free surfaces. When combined with low monomer prepolymers, the properties of the coating or sealant can be varied by adjusting the amount of additive. Baxenden Chemicals Ltd, Speciality Chemicals Division, Paragon Works, Baxenden BB5 2SL, UK; tel:+44-1254 872278; &x:+44-1254 871247
0 1997 Elsevier Science