Water repellent treatment of leather and skins with polysiloxanes functionalized with carboxyl groups in a comb-like manner

US5702490A · kind A · utility

Assignee

• BASF SE

Inventors

• Michael Kneip · Ludwigshafen, DE
• Peter Danisch · Ludwigshafen, DE

Key dates

• Filing date: Aug 15, 1996
• Grant date: Dec 30, 1997
• Expiry date: Aug 15, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L83/08
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Leather and skins are water repellent in aqueous emulsion in the presence of emulsifiers with polysiloxanes which are functionalized with carboxyl groups in a comb-like manner and in which the carboxyl groups are bonded to the polymer main chain via spacer groups in the form of linear or branched C.sub.2 -C.sub.40 -alkylene groups which may be interrupted by up to 8 non-neighboring oxygen atoms or groups of the formula --NR.sup.1 --, CO-- sic! or --CO--NR.sup.1 -- and in addition may carry up to 5 carboxyl groups or carboxamido groups of the formula --CO--NR.sup.1 R.sup.2 --, where R.sup.1 and R.sup.2 are each hydrogen or C.sub.1 -C.sub.4 -alkyl, the spacer groups being bonded to the polymer main chain via a direct bond or via an oxygen atom or a group of the formula --NR.sup.1 --, --CO--, --CO--NR.sup.1 -- or --CO--O--.