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US 8,557,883 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.
Claims19
An expanded copolymeric material comprising:
- a functional tetrafluoroethylene (TFE), copolymer comprising:
- (a) a first portion comprising a polymer chain of TFE and at least one comonomer having a functional group that is pendant to the polymer chain;
- and
- (b) a second portion consisting essentially of TFE monomers, wherein said functional group imparts a chemical or physical property to said expanded copolymeric material upon reaction with a chemical reactant or reagent, wherein said functional group is at least one member selected from the group consisting of:
- —COON and salts thereof,
- —COOR where R is alkyl,
- —OCOR where R is alkyl,
- —C≡N,
- —SO2X, where X is F or Cl,
- —SO3H and salts thereof,
- —SO2—NHN—SO2—,
- —O—P(═O)OH2 and
- —N═C═O.
10 more elements
An expanded copolymeric material comprising:
- a functional tetrafluoroethylene (TFE) copolymer comprising:
- (a) a first portion comprising a polymer chain of TFE and at least one comonomer having a functional group that is pendant to the polymer chain;
- and
- (b) a second portion consisting essentially of TFE monomers,
- wherein the at least one comonomer is a fluorovinyl ether comonomer of the general formula CF2═CF—ORfZ, where Rf represents a fluoro alkyl group optionally interrupted by one or more oxygen(s) and Z represents a functional group, and
- wherein said functional group imparts a chemical or physical property to said expanded copolymeric material upon reaction with a chemical reactant or reagent, wherein said functional group is at least one member selected from the group consisting of:
- —COON and salts thereof,
- —COOR where R is alkyl,
- —OCOR where R is alkyl,
- —C≡N,
- —SO2X, where X is F or Cl,
- —SO3H and salts thereof,
- —SO2—NHN—SO2—,
- —O—P(═O)OH2 and
- —N═C═O.
12 more elements
Dependencies are inferred from the claim text.