Perfluoroelastomer composition having excellent heat stability
AssigneeE. I. Du Pont de Nemours and Company
InventorWalter Werner Schmiegel
Life of this patent
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Abstract
Perfluoroelastomer compositions are provided which have excellent high temperature properties. The perfluoroelastomer component of the compositions are copolymers having a plurality of carbonyl-containing functional groups and copolymerized monomer units comprising a perfluoroolefin, a perfluoro(vinyl) ether and a nitrile-containing cure site monomer. The curative component is other than an organotin compound and includes peroxides, ammonium salts, aromatic amino compounds, bisamidrazones, and bisamidoximes.
Claims39
A curable perfluoroelastomer composition comprising
- (A) a perfluoroelastomer comprising copolymerized units of (1) a perfluoroolefin;
- (2) a perfluorovinyl ether selected from the group consisting of perfluoro(alkyl vinyl) ethers, perfluoro(alkoxy vinyl) ethers, and mixtures thereof;
- and (3) a cure site monomer having at least one nitrile group, selected from the group consisting of fluorinated olefins having at least one nitrile group, fluorinated vinyl ethers having at least one nitrile group, and mixtures thereof;
- wherein the perfluoroelastomer is characterized by i) having a plurality of carbonyl-containing endgroups selected from the group consisting of carboxyl endgroups, carboxylate endgroups, carboxamide endgroups, and mixtures thereof and ii) being substantially free of ionizable or ionized endgroups other than those having carbonyl-containing functional groups;
- and wherein the integrated absorbance ratio of the carbonyl-containing endgroups is greater than 0.1, the integrated absorbance ratio being determined by calculating the ratio of the integrated peak intensity within the range of 1620-1840 cm.sup.-1 to that within the range of 2220-2740 cm.sup.-1, as measured on a Fourier transform infrared spectrum of the perfluoroelastomer;
- and
- (B) about 0.1 to about 10 parts by weight per hundred parts by weight perfluoroelastomer of a curing agent other than an organotin curing agent.
A curable perfluoroelastomer composition comprising
- (A) a perfluoroelastomer having a plurality of carbonyl-containing functional groups selected from the group consisting of carboxyl groups, carboxylate groups, and carboxamide groups, said perfluoroelastomer comprising copolymerized units of (1) a perfluoroolefin;
- (2) a perfluorovinyl ether selected from the group consisting of perfluoro(alkyl vinyl ) ethers , perfluoro(alkoxy vinyl) ethers, and mixtures thereof, (3) a fluorinated comonomer selected from the group consisting of carboxyl-containing and carboxylate-containing comonomers, and (4) a cure site monomer having at least one nitrile group, selected from the group consisting of fluorinated olefins having nitrile groups, fluorinated vinyl ethers having at least one nitrile group and mixtures thereof wherein the integrated absorbance ratio of the carbonyl-containing functional groups is greater than 0.1, the absorbance ratio being determined by calculating the ratio of the integrated peak intensity within the range of 1620-1840 cm.sup.-1 to that within the range of 2220-2740 cm.sup.-1, as measured on a Fourier transform infrared spectrum of the perfluoroelastomer;
- and
- (B) about 0.1 to about 10 parts by weight per hundred parts by weight perfluoroelastomer of a curing agent other than an organotin curing agent.
Dependencies are inferred from the claim text.