Basf Aktiengesellschaft

Herbert Bay

Heinrich Hartmann

Walter Denzinger

Knut Oppenlaender

Norbert Greif

Karl Stork

Ortwin Schaffer

Guenter Eckert

Rudi Widder

Wolfram Bergold

Use of copolymers based on long-chain alkyl vinyl ethers and

Copolymers which are obtainable by free radical copolymerization of (a) C.sub.8 --C.sub.40 -monoolefins with (b) ethylenically unsaturated C.sub.4 -C.sub.8 -dicarboxylic anhydrides by mass polymerization at from 80.degree. to 300.degree. C. to give copolymers having molecular weights of from 500 to 20,000 g/mol, subsequent solvolysis of the anhydride groups of the copolymers and partial or complete neutralization of the carboxyl groups formed during the solvolysis, in an aqueous medium by means of a base, and which are present in the form of aqueous dispersions or solutions, are used as agents for rendering leathers and skins water-repellent.

Copolymers based on long-chain olefins and ethylenically unsaturated

Copolymers based on long-chain unsaturated esters and ethylenically

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

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

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Reutlingen, Germany

Herbert Bay