Developments in Colorants for Plastics by I. Christensen

By I. Christensen

At a time whilst it's severe to many plastics processors so as to add worth to items, colorants are a necessary a part of the ingredients repertoire. Plastics are frequently processed at very excessive temperatures and shear, and items are uncovered to light and heat. Colorants needs to tolerate those stipulations to operate correctly. This evaluation offers useful info for plastics processors in regards to colorant choice and the diversity of goods and results on hand. The evaluate is followed by means of round four hundred abstracts from the Rapra Polymer Library database, to facilitate additional examining in this topic.

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All products are heavy metal-free and provide excellent applicational properties. 10 refs. 27-32 English; Italian NEW METALLIC PIGMENTS FOR POWDER COATINGS Wheeler I R Silberline Ltd. Powder coating applications present special challenges for metallic pigments. It is a technology well placed to respond to ever-tightening environmental protection legislation. Two new pigment options for this rapidly growing market are presented. With these and other recent contributions, many of the market-limiting challenges of the past can be overcome.

This plate out problem has now been significantly diminished by a number of suppliers through better attachment of the dye to the carrier. The problem of light fastness is more fundamental. For most (but not all) fluorescent dyes the act of fluorescing slowly destroys the active ingredient and so the fluorescent effect fades away over time. Among the more widely used fluorescents are: Solvent Yellow 98, Solvent Yellow 135, Solvent Yellow 145, Solvent Yellow 160:1, Solvent Orange 63, Vat Red 41, Solvent Red 195 and Macrolex Red G (which does not have a Colour Index number).

6 refs. 122, 30 cm, 1/6/02. Rapra Review Report 146, Vol. 2, 2002. ) Rapra Review Report No. 146 Variations of in-mould decorating are reviewed, for the production of fully or partially decorated components straight from a variety of moulding processes. Such techniques can produce primers, labelling, graphics, natural patterns and automotive-style paint finishes, and are widely used in many packaging and automotive applications. Chosen techniques can involve the use of a film, powder, granules or liquid paint, and the lack of reliance of traditional paint shops is claimed to provide a selection of cost, space, processing time and environmental benefits.

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