DENSOTAN A.pdf - Prismadye

Technical InformationDensotan ATI/P 3324 eJune 2000 (DFC)Supersedes edition dated August 1999® = Registered trademark ofBASF AktiengesellschaftPlease file this leaflet in your“Wet-End” binder, Section 8Special polymer used in retannagesDensotan A is a novel type of polymer that is mainly applied to the leatherat the neutralization and retanning stages. It is very versatile, and it can beused to reduce the time required to retan leather and the consumption ofchemicals in the retanning process.Densotan A is lightfast, heat-resistant and particularly effective in theproduction of water-resistant leathers.Colorants and Finishing Products

Densotan AChemical natureAqueous anionic polymer solution, free of AOX and solvents.Solids content ca. 40%pH (diluted with demineralized water at 23 °C) ca. 7.5The above figures are approximate. A detailed specification is available onrequest.StorageThis product has a shelf life of at least one year if it is stored in its tightlysealed original packaging at temperatures between 5 °C and 40 °C.Drums should be tightly resealed each time material is taken from them,and their contents should be used up as soon as possible after they havebeen opened. This product must be protected from frost. The contents ofdrums should be stirred thoroughly before use.PropertiesDensotan A is an aqueous, polymer solution. It is supplied in the form of amobile, clear or slightly cloudy, yellow to brownish liquid. It is resistant tohard water and the salts and alkalis of monovalent metal ions.Densotan A has a pronounced dispersing effect, which causes it to improvethe distribution of other products that are applied to the leather at theneutralization and retanning stages of the process. This makes waterproofingmuch easier. Densotan A provides a very effective, economicalmeans of obtaining water-resistant leather, especially in combination withthe products in our Densodrin ® range.It also helps to avoid problems such as a drawn grain and unlevel dyeingwhich sometimes occur when water-resistant treatments are applied toleather.Densotan A is lightfast and resistant to yellowing at high temperatures andit has a neutral odour. It is particularly appropriate for retanning automotiveleathers, because it has very little tendency to fog.Densotan A also promotes the penetration of dye through thecross-section.ApplicationDensotan A can be applied either at the neutralization stage or in a freshbath immediately after neutralization.It needs to be applied at a rate of 4 – 8% at the neutralization or retanningstage, expressed as a proportion of the shaved weight, depending on thetype of leather and the desired effect.It is usually sufficient to apply Densotan A at a rate of 10% if it is used tostabilize fatliquor emulsions, expressed as a proportion of the fatliquorapplied.2

ExampleWater-resistant shoe upper leather(All percentages refer to the shaved weight,shaved thickness: 2 – 2.2 mm)Wash wet blue cattlehide thoroughly at 35 °C, drain float.75 % Water, 35 °C2 % Sodium formate 10 min.+ 4 % Densotan A (1:2)0.2 % Sodium bicarbonate 90 min., pH ca. 4.8Uniform blue stain withBromocresol GreenDrain float, wash thoroughly at 35 °C.75 % Water, 35 °C3 % Relugan ® RV (1: 3)3 % Basyntan ® SL4 % Mimosa2 % Relugan D 40 min.+ 2 % Luganil ® /Lurazol ® dye 40 min., pH } 4.6+ 4 % Densodrin CD(1: 2)+ 0.2 % Densotan A 60 min.+ 75 % Water, 60 °C 20 min.+ 1 % Formic acid (1:10) 3 x 10 + 20 min.,pH ca. 3.7Drain float, wash thoroughly at 30 °C.100 % Water, 30 °C0.5 % Densodrin CD(1: 2)0.1 % Densotan A 20 min.+ 3 % Chromitan ® FM 90 min. pH ca. 3.8Drain float, carefully wash twice with cold water, horse upovernight, set out, vacuum dry for 3 – 4 min. at 60 °C, hangup to dry, condition, stake, kiss plate.Further information on the BASF products mentioned in connection withDensotan A is given in the corresponding technical information leaflets.The shades of our dyes and pigments are illustrated in special pocketshade cards.SafetyWhen using this product, the information and advice given in our SafetyData Sheet should be observed. Due attention should also be given tothe precautions necessary for handling chemicals.NoteThe information submitted in this publication is based on our currentknowledge and experience. In view of the many factors that may affectprocessing and application, these data do not relieve processors of theresponsibility of carrying out their own tests and experiments; neither dothey imply any legally binding assurance of certain properties or of suitabilityfor a specific purpose. It is the responsibility of those to whom wesupply our products to ensure that any proprietary rights and existing lawsand legislation are observed.3

Printed in GermanyBASF Aktiengesellschaft Tel.: (49) 621 60 9 95 04 Fax: (49) 621 60 9 93 81Marketing World Leathere-mail: leather-info.ef@basf-ag.deBASF Colorants Pte. Ltd. Tel.: (65) 432 34 38 Fax: (65) 432 34 10Regional Marketing AsiaBASF Corporation Tel.: (1) 704 398 4209 Fax: (1) 704 398 42 82Regional Marketing NAFTABASF S.A. Tel.: (55) 11 751 29 68 Fax: (55) 11 751 22 16Regional Marketing South AmericaBASF Curtex S.A. Tel.: (34) 93 2 61 61 00 Fax: (34) 93 2 61 6211Regional Marketing EuropeBASF Aktiengesellschaft Tel.: (49) 621 60 4 45 47 Fax: (49) 621 60 4 46 18Regional Marketing Eastern Europe, Africa, Western AsiaColorants and Finishing Products