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US 7,008,587 B2Granted
Methods of improving extrusion properties in an extrudate
Assignee3M Innovative Properties Company
InventorThomas J. Blong
Life of this patent
Estimating the term…
Abstract
Methods of improving the extrusion properties in an extrudate are provided. The methods include blending a major amount of a first fluoropolymer containing a semi-crystalline fluorinated copolymer and a minor amount of a second fluoropolymer effective to improve extrusion properties in the composition, and melt processing the blend to form the extrudate.
Claims16
A method of improving extrusion properties in an extrudate comprising
- (i) blending a major amount of a first fluoropolymer, wherein the first fluoropolymer comprises a semi-crystalline fluorinated copolymer, and a minor amount of a second fluoropolymer effective to improve extrusion properties in the blend, and
- (ii) melt processing the blend to form the extrudate,
- wherein the first fluoropolymer is selected from class:
- (a) a semi-crystalline perfluorinated copolymer;
- (b) a fluoropolymer derived from interpolymerized units of at least one essentially perfluorinated monomer, at least one non-fluorinated hydrogen-containing monomer, and, optionally, perfluorobutyl-ethylene and/or no more than about 1% by weight of other partially fluorinated monomers;
- and
- (c) a fluoropolymer derived from interpolymerized units of at least one 5% by weight of at least one partially-fluorinated monomer selected from vinylidene fluoride, vinyl fluoride, and/or tri-fluoroethylene, and optionally at least one essentially perfluorinated monomer;
- and wherein the second fluoropolymer is selected from class (a);
- (b);
- (c);
- (d) an amorphous copolymer of tetrafluoroethylene and hexafluoropropylene;
- and
- (e) an amorphous fluorinated copolymer derived from interpolymerized units of a perfluoro (alkoxy vinyl) ether and a comonomer which may be partially or fully fluorinated;
- wherein when the first fluoropolymer is selected from (a), the second fluoropolymer is a fluoropolymer selected from at least one material of class (b), a semi-crystalline material of class (c), and/or a material from class (e);
- when the first fluoropolymer is selected from (b), the second fluoropolymer is selected from (a), (c), (d), and/or (e);
- and
- when the first fluoropolymer is a copolymer selected from (c), the second fluoropolymer is selected from (a), (b), (d), and/or (e),
- with the proviso that, when the blend comprises one or more copolymers selected from (c), the blend comprises either at least about 80% by weight of copolymers selected from (c) or no more than about 5% by weight of copolymers selected from (c).
15 more elements
Dependencies are inferred from the claim text.