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oai:library.wur.nl:wurpubs/328298 2011-03-02

urn:nbn:nl:ui:32-328298 2011-03-02 urn:nbn:nl:ui:32-328298/mods Colorants based on renewable resources and food-grade colorants for application in thermoplastics Oever, van den M.J.A. aut Boeriu C.G. aut Blaauw R. aut Haveren, van J. aut 31461740X 314600051 314612165 088183327 text info:eu-repo/semantics/article 2004 en A series of colorants based on renewable resources and food-grade colorants have been evaluated for use in polypropylene (PP) and polyvinylchloride (PVC). It has been found that most of these colorants can be processed in PP at 200°C or even 260°C while maintaining good color intensity and color brightness. The colorants evaluated cover a large part of the color spectrum. In PP, the light stability of alizarin (red), carmine (red), indigo (blue), purpurin (red), quinizarin (red), and the aluminium lakes of quinoline yellow (yellow) and indigo carmine (blue) is close to the requirements for indoor applications. The blue colorants indigo and the aluminium lake of indigo carmine are, in principle, sufficiently light stable in PP for indoor applications. A few colorants showed bleeding from PP. Bonding of migrating colorants to the reactive carrier maleic anhydride grafted polypropylene, however, reduced bleeding of the colorant to a large extent. Also after processing in PVC at 200°C, good color intensity and saturation is maintained. Quinizarin, a structural analog of alizarin and purpurin, shows a light stability performance that is close to commercial lead chromate/molybdate orange based colorants. The best performing natural colorants are sufficiently heat and light stable for applications where moderate properties concerning heat resistance and (UV) light stability are required, such as underground PVC water drainage pipes and indoor PP applications Biobased Products Journal of Applied Polymer Science 92 5. 2961 2969 URN:ISSN:0021-8995 urn:nbn:nl:ui:32-328298/obj 2010-01-14 qhttp://purl.org/eprint/accessRights/RestrictedAccess