Quaterpolymers of the tetrafluoroethylene/ethylene type
AssigneeHoechst Aktiengesellschaft
InventorReinhard A. Sulzbach
Life of this patent
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Abstract
Quaterpolymers are described which are composed of the following copolymerized monomer units (in mole %): (a) 55 to 30% of tetrafluoroethylene, (b) 60 to 40% of ethylene, (c) 10 to 1.5% of hexafluoropropylene and (d) 2.5 to 0.05% of a vinyl monomer which has "bulky" side chains and which can be, for example, a perfluorinated olefin, a perfluorinated vinyl ether, a perfluoroalkyl-substituted vinyl compound, a vinyl or allyl ether or an allyl or vinyl ester. The tensile strength and, in particular, the elongation at break at elevated temperatures is improved by the incorporation of both hexafluoropropylene and "bulky" vinyl monomers. The quaterpolymers are suitable for the manufacture of extruded articles, monofilaments and wire-coatings.
Claims18
A thermoplastic fluorine-containing quaterpolymer having a melting point between 245.degree. and 280.degree. C. measured as the minimum of the melting curve by differential thermal analysis and consisting essentially of copolymerized units, in mole percent, of
- (a) from 55% to 30% tetrafluoroethylene,
- (b) from 60% to 40% ethylene,
- (c) from 10% to 1.5% hexafluoropropylene, and
- (d) from 2.5% to 0.05% of a vinyl monomer selected from one of the classes consisting of
- (d.sub.1) perfluorinated olefins of the formula
- CF.sub.2 .dbd.CF--Rf1
- wherein RF1 is a perfluoroalkyl group having from 2 to 10 carbon atoms,
- (d.sub.2) perfluorinated vinyl ethers of the formula
- CF.sub.2 .dbd.CF--O--Rf2
- wherein Rf2 is a perfluoroalkyl group having from 2 to 10 carbon atoms,
- (d.sub.3) perfluorinated vinyl ethers of the formula ##STR11## wherein n is an integer from 1 to 4, (d.sub.4) perfluorinated vinyl ethers of the formula ##STR12## wherein n is 1 or zero, (d.sub.5) perfluoro-2-methylene-4-methyl-1.3-dioxolane,
- (d.sub.6) perfluorinated vinyl ethers of the formula
- CF.sub.2 .dbd.CF--O--(CF.sub.2).sub.n --COX.sub.1
- wherein X.sub.1 is F, OH, OR.sub.1, or NR.sub.2 R.sub.3, R.sub.1 is an alkyl group having from 1 to 3 carbon atoms, R.sub.2 and R.sub.3 each are H or identical with R.sub.1, and n is an integer from 1 to 10,
- (d.sub.7) perfluorinated vinyl ethers of the formula ##STR13## wherein X.sub.2 is COOR.sub.4, COOH, or CN, R.sub.4 is an alkyl group having from 1 to 4 carbon atoms, and n is an integer from 1 to 4,
- (d.sub.8) perfluoroalkyl-substituted vinyl compounds of the formula
- CH.sub.2 .dbd.CH--Rf3
- wherein Rf3 is a perfluoroalkyl group having from 2 to 10 carbon atoms,
- (d.sub.9) 1.1.1-trifluoro-2-(trifluoromethyl)-4-pentene-2-ol,
- (d.sub.10) allyl-2-hydroxyhexafluoroisopropyl ether,
- (d.sub.11) fluorinated allyl ethers of the formula
- CH.sub.2 .dbd.CR.sub.5 --CH.sub.2 --O--CF.sub.2 --CFX.sub.3 H
- wherein X.sub.3 is F, Cl or trifluoromethyl, and R.sub.5 is H or CH.sub.3 and
- (d.sub.12) fluorinated vinyl ethers of the formula
- CH.sub.2 .dbd.CH--O--CF.sub.2 --CFX.sub.3 H
- wherein X.sub.3 is F, Cl or trifluoromethyl.
A thermoplastic fluorine-containing quaterpolymer having a melting point between 245.degree. and 280.degree. C. measured as the minimum of the melting curve by differential thermal analysis and consisting essentially of copolymerized units, in mole percent, of
- (a) from 55% to 30% tetrafluoroethylene,
- (b) from 60% to 40% ethylene,
- (c) from 10% to 1.5% hexafluoropropylene, and
- (d) from 2.5% to 0.05% of a vinyl monomer selected from one of the classes consisting of
- (d.sub.1) perfluorinated olefins of the formula
- CF.sub.2 .dbd.CF--Rf1
- wherein Rf1 is a perfluoroalkyl group having from 2 to 10 carbon atoms,
- (d.sub.2) perfluorinated vinyl ethers of the formula
- CF.sub.2 .dbd.CF--O--Rf2
- wherein Rf2 is a perfluoroalkyl group having from 2 to 10 carbon atoms,
- (d.sub.3) perfluorinated vinyl ethers of the formula ##STR14## wherein n is an integer from 1 to 4, and (d.sub.4) perfluorinated vinyl ethers of the formula ##STR15## wherein n is 1 or zero.
A thermoplastic fluorine-containing quaterpolymer having a melting point between 245.degree. and 280.degree. C. measured as the minimum of the melting curve by differential thermal analysis and consisting essentially of copolymerized units, in mole percent, of
- (a) from 55% to 30% tetrafluoroethylene,
- (b) from 60% to 40% ethylene,
- (c) from 10% to 1.5% hexafluoropropylene, and
- (d) from 2.5 to 0.05% of a vinyl monomer selected from one of the classes consisting of
- (d.sub.8) perfluoroalkyl-substituted vinyl compounds of the formula
- CH.sub.2 .dbd.CH--Rf3
- wherein Rf3 is a perfluoroalkyl group having from 2 to 10 carbon atoms,
- (d.sub.9) 1.1.1-trifluoro-2-(trifluoromethyl)-4-pentene-2-ol,
- (d.sub.11) fluorinated allyl ethers of the formula
- CH.sub.2 .dbd.CR.sub.5 --CH.sub.2 --O--CF.sub.2 -CFX.sub.3 H
- wherein X.sub.3 is F, Cl, or trifluoromethyl, and R.sub.5 is H or CH.sub.3, and
- (d.sub.12) fluorinated vinyl ethers of the formula
- CH.sub.2 .dbd.CH--O--CF.sub.2 --CFX.sub.3 H
- wherein X.sub.3 is F, Cl, or trifluoromethyl.
Dependencies are inferred from the claim text.