Fluorochemical oligomer and use thereof
First Claim
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1. A fluorochemical oligomeric compound comprising:
- (i) an oligomeric portion having both fluoroaliphatic and fluorine-free aliphatic pendent groups;
(ii) an aliphatic moiety; and
(iii) a linking group which links the oligomeric portion to the aliphatic moiety, wherein at least one of said fluorine-free aliphatic pendent groups or said aliphatic moiety has 22 or more carbon atoms.
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Abstract
The present invention provides a novel fluorochemical oligomer, and polymer composition comprising the fluorochemical oligomeric compound and a thermoplastic or thermoset polymer. The polymer composition is useful in preparing shaped articles such as fibers and films which have desirable oil- and water repellency properties.
93 Citations
21 Claims
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1. A fluorochemical oligomeric compound comprising:
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(i) an oligomeric portion having both fluoroaliphatic and fluorine-free aliphatic pendent groups;
(ii) an aliphatic moiety; and
(iii) a linking group which links the oligomeric portion to the aliphatic moiety, wherein at least one of said fluorine-free aliphatic pendent groups or said aliphatic moiety has 22 or more carbon atoms. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
wherein the sum of a+b is an number such that the compound is oligomeric; R1 is 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;
Q and Q′
are each independently a covalent bond or an organic linking group,Rf is a fluoroaliphatic group that comprises a fully fluorinated terminal group;
Rh is a fluorine-free aliphatic group; and
X is a hydrogen atom or a group derived from a free radical initiator;
L is a non-polymeric linking group;
wherein at least one of said Rh and R groups has 22 or more carbon atoms.
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4. The fluorochemical oligomer of claim 3 wherein the ratio of Rf groups to Rh groups is at least 4:
- 1.
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5. The fluorochemical oligomer of claim 3 wherein Rf has the structure CoF2o+1, where o is 4 to 14.
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6. The compounds of claim 3 wherein L is selected from the group of a covalent bond, straight chain, branched chain, or cyclic alkylene, arylene, aralkylene, oxy, oxo, hydroxy, thio, sulfonyl, sulfoxy, amino, imino, sulfonamido, carboxamido, carbonyloxy, urethanylene, ureylene, and combinations thereof.
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7. The compounds of claim 3 wherein L is chosen from the group consisting of a covalent bond,
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8. The compounds of claim 3 comprising oligomerized units of compounds of the formula
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9. A polymer composition comprising the fluorochemical oligomeric compound of claim 1 and a thermoplastic or thermoset polymer.
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10. The composition of claim 9 wherein said thermoplastic polymers are selected from the group consisting of polyamides, acrylates, polyesters, polyurethanes, and polyolefins.
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11. The composition of claim 10 wherein said fluorinated oligomeric compound comprises from 0.5 to 5 weight percent of said composition.
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12. A shaped article comprising the composition of claim 10.
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13. The shaped article of claim 12 wherein said fluorinated oligomeric compound comprises from 10 to 10,000 ppm fluorine.
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14. The shaped article of claim 12 selected from the group of films, sheets and fibers.
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15. An oily mist resistant electret filter medium comprising polypropylene electret fibers comprising the composition of claim 9.
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16. The filter medium of claim 15 wherein said fibers have an effective fiber diameter of 2 to 30 micrometers.
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17. The filter medium of claim 15 wherein said fibers have been annealed.
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18. The filter medium of claim 15 wherein said filter media has a basis weight of 10 to 100 g/m2.
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19. A fabric comprising the fibers of claim 14.
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20. A medical gown comprising the fabric of claim 17.
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21. The composition of claim 9 wherein said thermoset polymer is selected from the group consiting of polyurethanes, epoxy resins, epoxides and acrylates.
Specification