Fluoropolymer
Assignee3M Innovative Properties Company
InventorsKlaus Hintzer, Ralph Kaulbach, Friedrich Kloos, Werner Schwertfeger
Life of this patent
Estimating the term…
Abstract
A fluoropolymer having a melting point of at least 160° C. is provided wherein the fluoropolymer is derived from tetrafluoroethylene as the major component, one or more perfluoro vinyl ethers as the minor component, the perfluoro vinyl ether having the formula CF2═CFO(CF2)nORf wherein n is from 2 to 6 and Rf is a perfluoroalkyl group having 1 to 6 carbon atoms, and optionally a perfluoro alkyl vinyl ether having from 1 to 5 carbon atoms in the alkyl radical.
Claims11
A polymer having a melting point of at least 1 60° C., having from 60 to 99.99% by weight of units derived from tetrafluoroethylene, from 0 to 30% by weight of units derived from hexafluoropropylene, from 0 to 10% by weight of units derived from other olefinic fluorinated or non-fluorinated monomers, from 0 to 35% by weight of units derived from perfluoro alkyl vinyl ether having from 1 to 5 carbon atoms in the alkyl radical, and from 0.01 to 35% by weight of units derived from one or more perfluoro vinyl ethers of the formula:
- CF2=CFO(CF2)nORf
- where
- n is an integer from 2 to 6 and
- Rf is a perfluoroalkyl group having from 1 to 6 carbon atoms:
The polymer as claimed in any of the previous claims, having less than 70 end groups other than —CF3 per 106 carbon atoms.
The polymer as claimed in any of the previous claims in the form of an agglomerate, melt granulate, compacted agglomerate or aqueous dispersion.
Method of making an extruded article comprising extruding a melted composition comprising a polymer having a melting point of at least 160° C., having from 60 to 99.99% by weight of units derived from tetrafluoroethylene, from 0 to 30% by weight of units derived from hexafluoropropylene, from 0 to 10% by weight of units derived from other olefinic fluorinated or non-fluorinated monomers, from 0 to 35% by weight of units derived from perfluoro alkyl vinyl ether having from 1 to 5 carbon atoms in the alkyl radical, and from 0.01 to 35% by weight of units derived from one or more perfluoro vinyl ethers of the formula:
- CF2═CF[O(CF2)n]m(OCF2)xORf
- where
- n is an integer from 2 to 6,
- m is an integer from 1 to 3,
- x is an integer from 0 to 4, and
- Rf is a perfluoroalkyl group having from 1 to 6 carbon atoms.
Extruded article comprising a polymer having a melting point of at least 160° C., having from 60 to 99.99% by weight of units derived from tetrafluoroethylene, from 0 to 30% by weight of units derived from hexafluoropropylene, from 0 to 10% by weight of units derived from other olefinic fluorinated or non-fluorinated monomers, from 0 to 35% by weight of units derived from perfluoro alkyl vinyl ether having from 1 to 5 carbon atoms in the alkyl radical, and from 0.01 to 35% by weight of units derived from one or more perfluoro vinyl ethers of the formula:
- CF2═CF[O(CF2)n]m(OCF2)xORf
- where
- n is an integer from 2 to 6,
- m is an integer from 1 to 3,
- x is an integer from 0 to 4, and
- Rf is a perfluoroalkyl group having from 1 to 6 carbon atoms.
Use of a fluoropolymer having a melting point of at least 315° C., having from 98.5% to 99.99% by weight of units derived from tetrafluoroethylene and from 0.01 to 1.5% by weight of units derived from one or more perfluoro vinyl ethers of the formula:
- CF2═CF[O(CF2)n]m(OCF2)xORf
- where
- n is an integer from 2 to 6,
- m is an integer from 1 to 3,
- x is an integer from 0 to 4, and
- Rf is a perfluoroalkyl group having from 1 to 6 carbon atoms;
- for making gaskets or an inner lining of pipes or containers.
Dependencies are inferred from the claim text.