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US 9,139,669 B2Granted
Expandable functional TFE copolymer fine powder, the expandable functional products obtained therefrom and reaction of the expanded products
AssigneeW. L. Gore & Associates, Inc.
InventorsPing Xu, Jack J. Hegenbarth, Xin Kang Chen
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Abstract
A functional TFE copolymer fine powder is described, wherein the TFE copolymer is a polymer of TFE and at least one functional comonomer, and wherein the TFE copolymer has functional groups that are pendant to the polymer chain. The functional TFE copolymer fine powder resin is paste extrudable and expandable. Methods for making the functional TFE copolymer are also described. The expanded functional TFE copolymer material may be post-reacted after expansion.
Claims11
A functional tetrafluoroethylene (TFE) copolymer fine powder resin comprising:
- a functional TFE core-shell copolymer comprising:
- a core comprising a polymer chain of TFE monomers and at least one comonomer having a functional group pendant to the polymer chain;
- and
- a shell consisting of TFE monomers,
- wherein the at least one comonomer having a functional group is present in the copolymer in an amount between 0.01 mol % and 5 mol % of the functional TFE core-shell copolymer,
- wherein the at least one comonomer having a functional group is a fluorovinyl ether of the general formula CF2═CF—ORfZ, where Rf represents a fluoroalkylene group optionally interrupted by one or more oxygen(s) and Z represents a functional group, and
- wherein Z is, nitrile, aldehyde, carboxylic acid or salt, ester, amine, amide, carbonyl halide, sulfonyl halide, sulfonic acid or salts thereof, sulfonamide, sulfonimide, anhydride, sulfide, phosphonic acid or salts thereof, hydroxy (alcohol) sulfate esters, phosphate esters, or isocyanate.
4 more elements
Dependencies are inferred from the claim text.