Washable leather with repellency
OwnerKai-Volker Schubert, Andrew Liu +1inventors
InventorsKai-Volker Schubert, Andrew Liu, Hansjoerg Scheen
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Abstract
A washable leather having durable oil repellency, durable stain release, and durable water repellency is disclosed and a method of its preparation comprising contacting the leather during tanning with a composition which comprises at least one fluorinated urethane; at least one fluorinated ester; a mixture thereof; or a mixture of at least one fluorinated citrate urethane with at least one fluorinated urethane, at least one fluorinated ester, or a mixture of fluorinated urethane and fluorinated ester.
Claims20
A method of imparting durable oil repellency, durable stain release, and durable water repellency to washable leather comprising contacting said washable leather with a composition which comprises at least one fluorinated urethane, at least one fluorinated ester, or a mixture thereof.
The method of 1 wherein the composition is a mixture of
- A) a dispersion of a fluorinated urethane polymer having at least one urea linkage derived by contacting (1) at least one polyisocyanate, or mixture of polyisocyanates, (2) at least one fluorocarbon alcohol, fluorocarbon thiol, or fluorocarbon amine (3) at least one straight or branched chain alcohol, amine or thiol, and (4) at least one alcohol containing a sulfonic acid group or its salt, and then (5) optionally at least one linking agent, and
- B) a dispersion of a fluorinated ester which is an oligomer or polymer having the structure of Formula 1
- wherein:
- Z is a hydrogen atom or a group derived from a free radical initiator;
- a is a positive integer and at least 4;
- b and c are independently zero or a positive integer;
- the sum (a+b+c) is a number such that the molecular weight is less than 1,000,000,
- each R1 is independently hydrogen, halogen, or straight chain or branched chain alkyl containing 1 to about 4 carbon atoms;
- each R2 is independently hydrogen or straight chain or branched chain alkyl containing 1 to about 4 carbon atoms;
- X is a divalent linking radical of formula —(CH2)p or —SO2N(R1)CH2CH2—, wherein p is 1 to about 20;
- and R1 is an alkyl of 1 to about 4 carbon atoms;
- each Q is independently a covalent bond, a straight chain or branched chain or cyclic alkylene, arylene, aralkylene, oxy, thio, sulfonyl, sulfoxy, amino, imino, sulfonamido, carboxamido, carbonyloxy, urethanylene, urylene, or combinations thereof;
- S is a sulfur atom;
- R is a saturated or unsaturated aliphatic moiety of at least 8 carbon atoms;
- Rf is a C4-C20 linear or branched fluorocarbon chain;
- Rh is a fluorine-free aliphatic group having 18 or fewer carbon atoms;
- Ro is a polyoxyalkylene group;
- and
- L is a covalent bond, straight chain or branched chain or cyclic alkylene, arylene, aralkylene, oxy, sulfonyl, sulfoxy, amino, imino, sulfonamido, carboxamido, carbonyloxy, urethanylene, ureylene, or combinations thereof.
A washable leather treated to provide durable oil repellency, durable stain release, and durable water repellency by contacting said leather with a composition which comprises at least one fluorinated urethane, at least one fluorinated ester, or a mixture thereof.
Dependencies are inferred from the claim text.