Fluorochemical oligomer and use thereof
First Claim
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1. A fluorochemical oligomer having the structure:
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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; and
L is a non-polymeric linking group.
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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.
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Citations
20 Claims
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1. A fluorochemical oligomer having the structure:
-
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; and
L is a non-polymeric linking group. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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7. The fluorochemical oligomer of claim 1 comprising oligomerized units of compounds of the formula
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8. A polymer composition comprising the fluorochemical oligomer of claim 1 and a thermoplastic or thermoset polymer.
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9. The polymer composition of claim 8 wherein said thermoplastic polymer is selected from the group consisting of polyamides, acrylates, polyesters, polyurethanes, and polyolefins.
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10. The composition of claim 8 wherein said fluorochemical oligomer comprises from 0.5 to 5 weight percent of said polymer composition.
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11. A shaped article comprising the polymer composition of claim 8.
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12. The shaped article of claim 11 wherein said fluorochemical oligomer comprises from 10 to 10,000 ppm fluorine.
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13. The shaped article of claim 11 selected from the group of films, sheets and fibers.
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14. An oily mist resistant electret filter medium comprising polypropylene electret fibers comprising the polymer composition of claim 9.
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15. The filter medium of claim 14 wherein said fibers have an effective fiber diameter of 2 to 30 micrometers.
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16. The filter medium of claim 14 wherein said fibers have been annealed.
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17. The filter medium of claim 14 wherein said filter media has a basis weight of 10 to 100 g/m2.
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18. A fabric comprising the fibers of claim 13.
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19. A medical gown comprising the fabric of claim 18.
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20. The composition of claim 8 wherein said thermoset polymer is selected from the group consisting of polyurethanes, epoxy resins, epoxides and acrylates.
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Specification