Hydrophobic polyurethane resins
Hydrophobic polyurethane polymers which may be useful in making synthetic leathers comprising at least two immediately consecutive repeating units according to Formula I: (—OC(O)N—) n A-NC(O)O-L(M)- (I) wherein n is 1 or 2, A represents the residue of an organic di- or tri-isocyanate compound, L represents a hydrocarbon group that optionally contains one or more catenary or non-catenary hetero-atoms, and M represents an oligomer comprising 2-12 (meth)acrylate units. The polyurethane polymers may additionally comprise end group(s) according to the formula -L′M wherein L′ represents a hydrocarbon group that may contain one or more catenary or non-catenary hetero-atoms. In some embodiments, M is according to Formula III: wherein Q is hydrogen or methyl, p is an integer between 2 and 12 inclusive, and Z is a hydrocarbon group which may optionally be substituted.
1. A polyurethane polymer comprising at least two immediately consecutive repeating units according to Formula I:
(—OC(O)N—) n A-NC(O)O-L(M)- (I)
wherein n is 1 or 2, selected independently for each repeating unit,
wherein A represents the residue of an organic di- or tri-isocyanate compound excluding its isocyanate groups, selected independently for each repeating unit,
wherein L represents a hydrocarbon group that may optionally contain one or more catenary or non-catenary hetero-atoms, selected independently for each repeating unit, and
wherein M represents an oligomer comprising 2-12 (meth)acrylate units derived from one or more (meth)acrylate monomers, selected independently for each repeating unit.
2. The polyurethane polymer according to claim 1 wherein n is 1 for each repeating unit.
3. The polyurethane polymer according to claim 1 wherein at least one L is according to Formula II:
wherein R and R′ represent hydrocarbon groups and X represents O, NH, or S.
4. The polyurethane polymer according to claim 3 wherein X is S.
5. The polyurethane polymer according to claim 1 additionally comprising at least one end group according to the formula -L′M wherein L′ represents a hydrocarbon group that may optionally contain one or more catenary or non-catenary hetero-atoms, selected independently for each end group.
6. The polyurethane polymer according to claim 5 wherein at least one L′ is according to the formula —R″X′—, wherein R″ represents a hydrocarbon group and X′ represents O, NH, or S.
7. The polyurethane polymer according to claim 6 wherein X′ is S.
8. The polyurethane polymer according to claim 1 wherein each M is independently selected from moieties according to Formula III:
wherein each Q is independently selected from hydrogen or methyl, each p is independently selected from integers between 2 and 12 inclusive, and each Z is independently selected from hydrocarbon groups which are optionally substituted.
9. The polyurethane polymer according to claim 8 wherein each Z is independently selected from C2-C22 n-alkyl, branched alkyl, or cycloaliphatic groups.
10. The polyurethane polymer according to claim 8 wherein each Z is independently selected from C16-C22 n-alkyl groups.
11. The polyurethane polymer according to claim 8 wherein each Z is an octadecyl group.
12. The polyurethane polymer according to claim 1 comprising no fluorine.
13. The polyurethane polymer according to claim 1 comprising no carbodiimide groups.
14. A synthetic leather comprising the polyurethane polymer according to claim 1 .
15. The synthetic leather according to claim 14 additionally comprising a fibrous support which is a polymeric, non-woven fibrous support, and wherein the fibrous support is coated with or embedded in the polyurethane polymer.