Use of amphiphilic copolymers containing a fluorinated monomer to impart waterproofness to leather
First Claim
1. Method of treating leather comprising contacting a leather with an amphiphilic copolymer, said amphiphilic copolymer comprising the following recurring units:
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wherein;
Rf represents a fluorinated alkyl group having at least 3 carbon atoms;
Q and Q′
each independently represent an organic linking group or a bond;
R1 and R2 each independently represent hydrogen or a C1 to C4 alkyl group and;
Rh represents a hydrocarbon group having at least 8 carbon atoms and optionally containing 1 to 3 substituents selected from the group consisting of a halogen, an amino group, an aryl group, and an alkoxy group;
and a recurring unit comprising at least one carboxylic acid group or salt thereof.
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Abstract
The present invention provides an amphiphilic copolymer comprising recurring units (I) and (II), wherein: Rf represents a fluorinated alkyl group having at least 3 carbon atoms; Q and Q′ each independently represents an organic liking group or a chemical linkage; R1 and R2 each independently represents hydrogen or a C1 to C4 alkyl group; and Rh represents a hydrocarbon group having at least 8 carbon atoms and optionally containing 1 to 3 substituents; and a recurring unit comprising at least one carboxylic acid group or salt thereof. The present invention also provides a method for making the above amphiphilic copolymer. The amphiphilic copolymer can be used in a leather treatment to provide waterproofness to the leather.
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Citations
29 Claims
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1. Method of treating leather comprising contacting a leather with an amphiphilic copolymer, said amphiphilic copolymer comprising the following recurring units:
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wherein; Rf represents a fluorinated alkyl group having at least 3 carbon atoms;
Q and Q′
each independently represent an organic linking group or a bond;
R1 and R2 each independently represent hydrogen or a C1 to C4 alkyl group and;
Rh represents a hydrocarbon group having at least 8 carbon atoms and optionally containing 1 to 3 substituents selected from the group consisting of a halogen, an amino group, an aryl group, and an alkoxy group;
and a recurring unit comprising at least one carboxylic acid group or salt thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
wherein; R3 represents hydrogen or a C1 to C4 alkyl group;
Y represents an organic linking group or a bond and;
M represents a hydrogen or a cation.
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3. Method according to claim 1 wherein said amphiphilic copolymer further comprises siloxane containing recurring units.
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4. Method according to claim 1 wherein Rh represents an unsubstituted alkyl group and Rf corresponds to CnF2n+1- wherein n is an integer between 3 and 14.
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5. Method according to claim 2 wherein said amphiphilic copolymer comprises recurring units according to formula (I) in an amount of at least 1% by weight, said recurring units according to formula (I) in an amount of at least 20% by weight and said recurring units according to formula (III) in amount between 5% and 60% by weight, said weight percentages being relative to the total weight of recurring units according to formulas (I), (II) and (Ill).
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6. Method according to claim 1 wherein said leather is also contacted with a water and/or oil repellent composition.
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7. Method according to claim 1 wherein said amphiphilic copolymer is in the form of an aqueous dispersion.
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8. Method according to claim 7 wherein said leather is contacted with said aqueous dispersion during retanning.
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9. Method according to claim 2 wherein Rh represents an unsubstituted alkyl group and Rf corresponds to (CnF2n+1)- wherein n is an integer between 3 and 14.
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10. An amphiphilic copolymer comprising the following recurring units:
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wherein; Rf represents a fluorinated alkyl group having at least 3 carbon atoms;
Q and Q′
each independently represent an organic linking group or a bond;
R1 and R2 each independently represent hydrogen or a C1 to C4 alkyl group and;
Rh represents a hydrocarbon group having at least 8 carbon atoms and optionally containing 1 to 3 substituents selected from the group consisting of a halogen, an amino group, an aryl group, and an alkoxy group;
and a recurring unit comprising at least one carboxylic acid group or salt thereof. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
wherein; R3 represents hydrogen or a C1 to C4 alkyl group;
Y represents an organic linking group or a chemical linkage and;
M represents a hydrogen or a cation.
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12. An amphiphilic copolymer according to claim 10 further comprising siloxane containing recurring units.
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13. An amphiphilic copolymer according to claim 10 wherein Rh represents an unsubstituted alkyl group and Rf corresponds to CnF2n+1- wherein n is an integer between 3 and 14.
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14. An amphiphilic copolymer according to claim 11 wherein said amphiphilic copolymer comprises recurring units according to formula (I) in an amount of at least 1% by weight, said recurring units according to formula (II) in an amount of at least 20% by weight and said recurring units according to formula (III) in amount between 5% and 60% by weight, said weight percentages being relative to the total weight of recurring units according to formulas (I), (11) and (III).
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15. An aqueous composition comprising an amphiphilic copolymer according to claim 10.
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16. An aqueous composition according to claim 15 further comprising a water and/or oil repellent composition.
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17. An aqueous composition according to claim 16 wherein said water and/or oil repellent composition comprises fluoroaliphatic esters of dimer acids and/or trimer acids.
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18. A leather treated with an amphiphilic copolymer according to claim 10.
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19. An amphiphilic copolymer according to claim 11 wherein Rh represents an unsubstituted alkyl group and Rf corresponds to (CnF2n+1)- wherein n is an integer between 3 and 14.
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20. An aqueous composition comprising an amphiphilic copolymer according to claim 11.
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21. An aqueous composition comprising an amphiphilic copolymer according to claim 12.
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22. An aqueous composition comprising an amphiphilic copolymer according to claim 13.
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23. An aqueous composition comprising an amphiphilic copolymer according to claim 14.
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24. A leather treated with an amphiphilic copolymer according to claim 11.
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25. A leather treated with an amphiphilic copolymer according to claim 12.
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26. A leather treated with an amphiphilic copolymer according to claim 13.
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27. A leather treated with an amphiphilic copolymer according to claim 14.
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28. A method for making an amphiphilic copolymer comprising a free radical polymerisation of a mixture comprising monomers (a), (b) and an ethylenically unsaturated monomer having at least one carboxylic acid group or a salt thereof or a precursor of a carboxylic acid group:
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wherein; at least 20% by weight of the total weight of recurring units is derived from monomer (b) and at least 1% by weight of the total weight of recurring units is derived from monomer (a);
Rf represents a fluorinated alkyl group having at least 3 carbon atoms;
Q and Q′
each independently represent an organic linking group or a chemical linkage;
R1 and R2 each independently represent hydrogen or a C1 to C4 alkyl group; and
Rh represents a hydrocarbon group having at least 8 carbon atoms and optionally containing 1 to 3 substituents. - View Dependent Claims (29)
wherein; Y represents an organic linking group or a chemical linkage;
R3 represents hydrogen or a C1 to C4 alkyl group and;
M represents hydrogen or a cation.
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Specification