Patent · US Expired

Processing for rendering leather hydrophobic and oleophobic by impregnation with fluoro chemicals

US4971835A · kind A · utility

6Cited by

3References

21Claims

0Family size

Assignee

Hoecht Aktiengesellschaft · DE

Inventors

Norbert Munch · Kelkheim, DE
Lothar Schlosser · Frankfurt am Main, DE
Gustav Hudec · Schwalbach, DE

Key dates

Filing date	Aug 22, 1988
Grant date	Nov 20, 1990
Priority date	—
Expiry date	Aug 22, 2008

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/3154
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

The leather is treated with a resin, quaternary ammonium compound, amine or polymer before the impregnation with the fluoro chemicals. With these auxiliaries, a uniform effectiveness of the fluoro chemicals which act on the surface is achieved, regardless of the procedure or the chemicals previously introduced into the leather. These auxiliaries can optionally also be applied to the leather together with the fluoro chemicals.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.