Leather with fluorochemical finish

Claim 2

A process for imparting oil and water repellency to a fibrous substrate, which comprises contacting said substrate with a treating composition comprising fluorochemical compounds which are normally solid, water insoluble, aliphatic carboxylic acids and salts thereof which are self-dispersible in water, said compounds containing fluoroaliphatic and aliphatic carboxylic radicals, said fluoroaliphatic radicals having at least three fully fluorinated carbon atoms and a terminal perfluoromethyl group, and urylene and/or carbamato radicals, said radicals bonded together by organic linkages free of interfering moieties, said compounds containing at least 20 weight percent fluorine in the form of said fluoroaliphatic radical.

Claim 3

A process for imparting oil and water repellency to tanned leather, which comprises contacting leather after tanning and while water wetted with a treating agent comprising fluorochemical compounds which are normally solid, water insoluble, aliphatic carboxylic acids and salts thereof which are self-dispersible in water, said compounds represented by the formula (R--Q--A--Q'--).sub.m (Q).sub.n COOM where R is a fluoroaliphatic radical having at least three fully fluorinated carbon atoms and a terminal perfluoromethyl group, or an aliphatic radical which is essentially fluorine-free Q is organic linkage free of interfering moieties, Q' is Q or Q--A--Q, each A is independently --NHCONH-- or --OCONH--, M is a hydrogen atom or an alkali metal, ammonium, or organoammonium ion, m is 1 or 2, with the provisos that if m is 1, R is said fluoroaliphatic radical, and if m is 2, at least one of the two R radicals is a fluoroaliphatic radical, n is zero or 1 with the proviso that when n is zero, m is 1, and said compounds contain at least 20 weight percent fluorine in the form of said fluoroaliphatic radical.

Claim 4

A process for imparting oil and water repellency to tanned leather, which comprises contacting leather after tanning and while water wetted with a treating agent comprising fluorochemical compounds which are normally solid, water insoluble, aliphatic carboxylic acids and salts thereof which are self-dispersible in water, said compounds represented by the formula (R--Q--A--Q'--).sub.m (Q).sub.n COOM where R is a fluoroaliphatic radical having at least three fully fluorinated carbon atoms and a terminal perfluoromethyl group, or an aliphatic radical which is essentially fluorine-free Q is organic linkage free of interfering moieties, Q' is Q or Q--A--Q, each A is independently --NHCONH-- or --OCONH--, M is a hydrogen atom or an alkali metal, ammonium, or organoammonium ion, m is 1 or 2, with the provisos that if m is 1, R is said fluoroaliphatic radical, and if m is 2, at least one of the two R radicals is a fluoroaliphatic radical, n is zero or 1 with the proviso that when n is zero, m is 1, and said compounds contain at least 20 weight percent fluorine in the form of said fluoroaliphatic radical.

Claim 5

The process according to claim 2, wherein said tanned leather is chrome-tanned cattlehide and said contact is carried out by adding said fluorochemical compound as an aqueous dispersion of the water-dispersible salt thereof to the post tanning drum during the wet processing of said tanned leather.

Claim 6

The process according to claim 1, wherein said fluorochemical compound is that represented by the formula: ##STR29## or that represented by the formula: ##STR30##

Claim 7

A fibrous substrate having deposited on a surface thereof fluorochemical compound according to the process of claim 1.

Claim 8

Chrome-tanned leather having sufficient amount of fluorochemical compound deposited on a surface thereof according to the process of claim 2 to impart oil and water repellency to said surface.

Claim 9

A process for imparting oil and water repellency to tanned leather according to claim 2 wherein A is --OCONH--.