Basf Aktiengesellschaft

Badische Anilin- & Soda-fabrik Aktiengesellschaft

Guenter Eckert

Karl Fischer

Peter Horn

Juergen Schmidt-Thuemmes

Erich Penzel

Herbert Bay

Franz Leppmeier

Lothar Wuertele

Peter Rudolf

August Lehner

Kaspar Bott

Werner Balz

Karl Haeberle

Harro Petersen

Hans Renz

Joachim Hack

Dietrich Lach

Rudi Widder

Roland Falk

Peter Weyland

Martin Meister

Kurt Fischer

Ulrich Goeckel

Albrecht Zosel

Wolfram Bergold

Franz-Friedrich Miller

Lothar Heider

France Knaflic

Werner Schackert

Karl H Roemer

Werner Maltry

Alfred Zissel

Karl Krucker

An aqueous polymer dispersion gives a film having high resilience in conjunction with reduced surface tack and good aging resistance under the action of light, heat and oxygen and is used for coating leather.

Aqueous polymer dispersion

Aqueous synthetic resin dispersions are obtainable by copolymerizing

Method of coating leather using aqueous synthetic resin dispersions

Aqueous dispersions of polyurethanes which are crosslinkable by the action of high energy radiation contain (a) a polyisocyanate, (b) a polyol having a molecular weight of from 400 to 6,000 g/mol, (c) if required, a polyol having a molecular weight of from 62 to 399 g/mol, (d) if required, a polyamine having two or more amino groups which are reactive to isocyanate, (e) if required, an aminoalcohol having one or more amino groups which are reactive to isocyanate, (f) a compound containing ionic groups or groups which can be converted into ionic groups and one or more hydroxyl or amino groups which are reactive to isocyanate (g) if required, a monofunctional polyetheral and (h) a compound having one or more ethylenically unsaturated groups and one or more hydroxyl groups. The compound having an ethylenically unsaturated group (h) is used in amounts corresponding to 0.02-0.08 gram equivalent, based on the polyisocyanate (a), of OH, and the polyurethane, dissolved in dimethylformamide, has a Fikentscher K value greater than 40 or is insoluble in dimethylformamide.

Aqueous dispersions of polyurethanes which are crosslinkable by the

Leather, pelts and leather substitute materials are hydrophobized with a carboxyl-containing polysiloxane whose carboxyl groups are present in neutralized form in an aqueous phase in the absence of emulsifiers and without aftertreatment with mineral tanning agents.

Hydrophobization of leather, pelts and leather substitute materials with

Leather is finished on the basis of a purely aqueous system using aqueous polymer dispersions, casein and crosslinking agents in the bottoming and seasoning.

Finishing of leather

A process for waterproofing leather and skins with a silicone oil and the salt of an N-(C.sub.9 -C.sub.20 -acyl)-amino acid as an emulsifier for the silicone oil, which is carried out in the aqueous phase during or after retanning, and the use of salts of N-acylamino acids as emulsifiers for silicone oils in the waterproofing of leather and skins in the aqueous phase, and the mixtures used for this purpose.

Waterproofing leather and skins

N-substituted acrylamide or methacrylamide derivatives of the general formula ##STR1## where m is 0 or 1, n is 1, 2, 3 or 4, n-m is 1, 2, 3 or 4, X is Br or Cl, and R.sup.1 and R.sup.2 are each CH.sub.3 or H, are prepared by reacting an aromatic haloalkyl compound with N-methylolacrylamide or N-methylolmethacrylamide in the presence of a strong acid.

N-substituted acrylamide and methacrylamide derivatives and their

Magnetic recording media possessing a thin magnetic layer are produced by dispersing finely divided magnetically anisotropic material and conventional additives in a solution of a polymeric binder in an organic solvent, applying a layer of the dispersion to a non-magnetizable base by means of a knife-coater, then, if required, orienting the magnetically anisotropic material by means of a magnetic field and drying the applied layer, a high molecular weight organic compound which acts as a thickener being added to the magnetic dispersion.

Production of magnetic recording media

Emulsion copolymerization of acrylic or methacrylic acid esters with from 0.3 to 10% by weight of .alpha.,.beta.-monoolefinically unsaturated monocarboxylic acids and/or dicarboxylic acids and/or their amides, with or without up to 25% by weight of styrene, acrylonitrile, vinyl acetate and/or vinyl chloride, using the emulsion feed process, gives particularly concentrated copolymer dispersions if an emulsifier system of 0.01-5.0% by weight of a sulfuric acid half-ester of an oxyalkylated alkylphenol and 0.01-1% by weight of a dialkyl sulfosuccinate, where alkyl is of 6 to 18 carbon atoms, is employed and the polymerization is carried out at pH 2-6.

Preparation of concentrated polyacrylate dispersions

A process is disclosed for insolubilizing casein coatings for leather utilizing alkoxy alkyl ureas. The coatings are cured in the presence of an acid catalyst. The casein coatings of the invention avoid the disadvantageous use of aldehydes such as formaldehyde and glutaraldehyde to cure the casein and reduce its water sensitivity and unexpectedly show improved wet abrasion resistance.

Casein coatings for leather insolubilized with alkoxy alkyl ureas

Process for dehairing skin and hide with mercapto compounds in the presence of an alkaline medium in a short liquor.

Dehairing skin and hide

Nylon copolymer containing piperazine and a process for finishing leather and imitation leather, having a surface of polyurethane or plasticized PVC, by applying a solution of this nylon copolymer and drying it. The overall properties of the finish are better then those of conventional finishes.

Nylon copolymer from piperazine, aliphatic diamine and mixture of

A specific copolyamide and its use for finishing leather and leather substitutes, particularly those of polyurethane. A particular advantage of the copolyamide is its sealing effect counteracting the migration of dyes, plasticizers and fats, combined with other advantages such as good mechanical properties and the stability of the solutions.

Growing community of inventors

Limburgerhof, Germany

Guenter Eckert