Heliogen

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Heliogen

Technical InformationEVP 003205 e, August 2007supersedes EVP 003205 e, July 2006Page 1 of 14®= registered trademark ofBASF Aktiengesellschaft,Heliogen ®unless otherwise indicatedpigments for coatingsall-purpose phthalocyanine pigments with outstandingfastness propertiesHeliogen ® is BASF’s trademark for phthalocyanine blue and greenpigments. All but one – Heliogen ® Blue L 7460, which is metal-free– are copper phthalocyanine pigments. This range comprises manyproducts developed in response to customer demand for specialcoloristic and technical qualities.The individual pigments differ from one another in their hue, colorstrength, chroma, transparency, dispersibility, flow properties, resistanceto flocculation and tendency to bronzing.The letter L preceding the pigment code number indicates that thepigment in question has been specially produced and tested foruse in coatings. The letter D following the code number indicatesthat the pigment is easily dispersed; F stands for stability toflocculation.


EVP 003205 e, August 2007 Page 11 of 14 Heliogen ® pigments for coatingsobtained by different methods of application (e. g. spraying andcurtain coating), and separation of the liquid paints during storage.These disadvantages can be largely overcome by special surfacetreatment or by chemical modification of the phthalocyaninemolecule.Since resistance to flocculation is a property of the system in whichbinder and solvents also play a role, it is impossible to make ageneral statement about which of our flocculation-resistant pigmentswill perform best in any particular binder system. We haveobserved, however, that the surface-modified Heliogen ® BlueL 6875 F; Heliogen ® Blue L 6975 F and Heliogen ® Blue L 6989 Ftend to have good flocculation stability in “difficult” binder systems.Nearly universal use, great color strength and transparency arecharacteristics for Heliogen ® Blue L 6905 F and Heliogen ® BlueL 7101 F.The flocculation stability may also be improved by producing pigmentswith nearly isometric particles. This is how the good flocculationstability of the readily dispersible Heliogen ® Blue L 7072 Dand Heliogen ® Blue L 7081 D is achieved.As a result of halogenation of the phthalocyanine ring, Heliogen ®green pigments have a better basic resistance to flocculation thanthe blue types and therefore do not usually require surfacetreatment.Rheological propertiesBronzingThe flow properties of pigmented systems are influenced by thesize, size distribution and shape of the pigment particles and by thenature of the finish. Generally speaking, flocculation-resistant pigmentsflow better than the corresponding untreated pigments. Thebeta blue types Heliogen ® Blue L 7072 D and Heliogen ® BlueL 7081 D also show good flow behavior. Heliogen ® Green L 8690flows better than the other two green pigments Heliogen ® GreenL 8605 and Heliogen ® Green L 8730.The red bronzing that is typical of copper phthalocyanine blue pigmentsis connected with their high coefficients of light absorptionand refraction in the long-wave region of the visible spectrum.Bronzing usually only occurs in over-pigmented coatings (with over5 % pigment in the dry coating) where degradation of the binderfilm exposes pigment particles at the surface of the coating. Theseparticles can then directly reflect incident light. Thanks to their outstandingfastness to weathering, phthalocyanine pigment particlesare not destroyed along with the binder, so they will accumulate atthe surface.Thus the tendency to bronzing depends on both the paint formulationand the specific surface – and hence also on the binder requirementof the pigments. Pigments with large primary particles,such as Heliogen ® Blue L 7081 D, therefore show less bronzing.


EVP 003205 e, August 2007 Page 12 of 14 Heliogen ® pigments for coatingsRecrystallizationUnder very unfavorable conditions, Heliogen ® Blue L 6875 F canshow a tendency to recrystallize (on storage) under loss of colorstrength.Influencing factors are:type of solventconcentrationtemperaturefine-particled pigments, e. g., carbon blackFor especially sensitive systems, we recommend an alternativemixture made up of three parts Heliogen ® Blue L 6905 F and onepart of Heliogen ® Blue L 6700 F.ApplicationSince Heliogen ® pigments exhibit a very high standard in all theirfastness properties, they can be used in practically all types ofcoatings.Any signs of fading that may occasionally be observed after outdoorexposure are usually due to binder degradation and chalkingof the titanium dioxide present. Owing to the hydrophobic nature ofcopper phthalocyanine particle surfaces, however, weathered filmsmay also release particles of copper phthalocyanine pigment. Thiseffect is often due to low binder concentration and high content ofinorganic extenders, especially in emulsion paints.If the coating is expected to withstand extremely severe exposureconditions, it may be advisable to use our Sicopal ® blue and greenpigments for plastics coloration, especially in the case of severeexposure to chemicals, e. g., ozone or chlorine (paints for swimmingpools) or to extremes of heat. These pigments are also usedfor toning white finishes.The paragraphs below give special information on the applicationsof Heliogen ® blue pigments. Among the Heliogen ® green pigments,Heliogen ® Green L 8730 and Heliogen ® Green L 9361 are suitablefor practically all applications.Air-drying alkyd resin coatingsBaking finishes (alkyd/melamine,TSA, polyester and others)Regarding resistance to flocculation, color and economy, a goodcompromise is reached with Heliogen ® Blue L 6905 F (a reddishalpha type that is a further development of Heliogen ® Blue L 6901 Fwith higher color strength and chroma) and, a greenish beta type,Heliogen ® Blue L 7101 F. Heliogen ® Blue L 6975 F produces optimumresistance to flocculation, but only develops its full colorstrength in aromatic solvent blends. Pigments that are not resistantto flocculation (such as Heliogen ® Blue L 6920 and Heliogen ® BlueL 7080) are the most economical but may cause problems likeshade variations and reduced gloss.Among the alpha types, Heliogen ® Blue L 6975 F stands out becauseof its extremely good flocculation resistance and good flowproperties, while Heliogen ® Blue L 6989 F also offers maximum


EVP 003205 e, August 2007 Page 13 of 14 Heliogen ® pigments for coatingscolor strength. Of the beta types, the best compromise is usuallyHeliogen ® Blue L 7101 F.Coil coating systemsPowder coatingsTwo-component coatingsThe extreme demands of this application with regard to flocculationstability are best met by Heliogen ® Blue L 6989 F. In plastisols,Heliogen ® Blue L 7072 D shows good results.The prime requirement is good dispersibility and development ofcolor strength during extrusion. Flocculation resistance is not acriterion here. We especially recommend Heliogen ® Blue L 6930and Heliogen ® Blue L 7072 D and, for extremely reddish shades,Heliogen ® Blue L 6700 F. Heliogen ® Green L 8731 is recommendedfor green shades.Heliogen ® Blue L 6989 F has the highest flocculation stability inacrylic/isocyanate systems.Heliogen ® Blue L 6975 F reduces the pot-life of some systems. Preliminarytrials should always be carried out because we cannot giveany firm information on how our Heliogen ® pigments affect thecuring characteristics of various binder systems.Water-based coatings,aqueous mediaNormally, Heliogen ® pigments can be dispersed in aqueous mediawithout any trouble, because the surfactants used ensure satisfactorywetting of the hydrophobic pigment surfaces.The “standard” types Heliogen ® Blue L 6920 and Heliogen ® BlueL 7080 are widely used in this application.Heliogen ® Blue L 6975 F is usually preferred for easy dispersibilityand very good flocculation resistance. In so called multi-purposepastes, Heliogen ® Blue L 6905 F and Heliogen ® Blue L 7101 F havealready repeatedly proved their worth. Heliogen ® Blue L 6975 F isnot recommended because it has a tendency to foam during applicationin aqueous media.UV-curable systemsEffect coatingsFor curing pigmented systems, transparency to radiation is necessary,especially to long-wave ultraviolet. This requirement is bestmet by Heliogen ® Blue L 6700 F.For application in metallic and mica coatings, the more transparenttypes are particularly suitable. Aside from maximum transparency,Heliogen ® Blue L 6989 F displays optimum flocculation resistanceand good flow properties and is therefore usually to be preferred toHeliogen ® Blue L 6930 and Heliogen ® Blue L 6905 F, which are alsohighly transparent, as well as to the metal-free Heliogen ® BlueL 7460.If a strong red “flop effect” is desired, this can be achieved withHeliogen ® Blue L 6700 F or Heliogen ® Blue L 7081 D. OftheHeliogen ® Green types, mostly Heliogen ® Green L 8730 andHeliogen ® Green L 9361 (very yellowish) are used.


EVP 003205 e, August 2007 Page 14 of 14 Heliogen ® pigments for coatingsSafetyWhen handling these products, advice and information given in thesafety data sheet must be complied with. Further, protective andworkplace hygiene measures adequate for handling chemicalsmust be observed.NoteThe data contained in this publication are based on our currentknowledge and experience. In view of the many factors that mayaffect processing and application of our product, these data do notrelieve processors from carrying out their own investigations andtests; neither do these data imply any guarantee of certain properties,nor the suitability of the product for a specific purpose. Anydescriptions, drawings, photographs, data, proportions, weights,etc. given herein may change without prior information and do notconstitute the agreed contractual quality of the product. It is theresponsibility of the recipient of our products to ensure that anyproprietary rights and existing laws and legislation are observed.20070828_evp003205_e_l_ti_heliogen_lacke.doc / EVP 003205-0707 EBASF AktiengesellschaftPerformance Chemicals forCoatings, Plastics and Specialties67056 Ludwigshafen, Germanywww.basf.com/pigmentswww.basf.com/resinswww.basf.com/lightstableizers

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