Perfluoroelastomer compositions for low temperature applications
First Claim
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1. A perfluoroelastomer composition comprisingA) a perfluoroelastomer comprising copolymerized units of i) 40 to 55 mole percent perfluoro(alkyl vinyl ether), ii) 0.1 to 3 mole percent of a cure site monomer and the remaining copolymerized units being of iii) tetrafluoroethylene so that total mole percent is 100;
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(O—
CF2CF2)n(OCF2)m—
OCF3;
ii) F—
(CF2CF2CF2—
O)p—
CF3; and
iii) F—
(CF(CF3)—
CF2—
O)q—
CF2CF3 wherein n, m, p and q are integers between 1 and 180.
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Abstract
Perfluoroelastomers that contain high levels (i.e. about 40 mole percent or more) of perfluoro(alkyl vinyl ether) copolymerized units can form stable blends with higher levels of perfluoropolyethers than can perfluoroelastomers that contain lower levels of perfluoro(alkyl vinyl ether) units. Thus, the former blends have better low temperature properties than the latter.
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Citations
10 Claims
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1. A perfluoroelastomer composition comprising
A) a perfluoroelastomer comprising copolymerized units of i) 40 to 55 mole percent perfluoro(alkyl vinyl ether), ii) 0.1 to 3 mole percent of a cure site monomer and the remaining copolymerized units being of iii) tetrafluoroethylene so that total mole percent is 100; - and
B) 25 to 50 phr of a perfluoropolyether selected from the group consisting of i) CF3—
(O—
CF2CF2)n(OCF2)m—
OCF3;
ii) F—
(CF2CF2CF2—
O)p—
CF3; and
iii) F—
(CF(CF3)—
CF2—
O)q—
CF2CF3 wherein n, m, p and q are integers between 1 and 180. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification