ULTRA-LOW TEMPERATURE ELASTOMERIC FLUOROPOLYMER COMPOSITIONS AND PROCESSES FOR PREPARING THE SAME
An elastomeric fluoropolymer includes the following monomer units: about 45 mol % to about 65 mol % —CF 2 —CH 2 —; about 8 mol % to about 30 mol % —CF 2 —CF 2 —; about 4.5 mol % to about 25 mol % —CF 2 —CF(O—CF 3 )—; and about 6 mol % to about 20 mol % —CF 2 —CF(O—CF 2 —CF 2 —O—(CF 2 —O) n —CF 3 )—, where n is 1 or 2. In some embodiments, a composition includes an elastomeric fluoropolymer and at least one additive. In some embodiments, a composition includes a first elastomeric fluoropolymer and a second elastomeric fluoropolymer blended with the first elastomeric fluoropolymer. The first elastomeric fluoropolymer includes the following monomer units: about 45 mol % to about 65 mol % —CF 2 —CH 2 —; about 8 mol % to about 30 mol % —CF 2 —CF 2 —; about 4.5 mol % to about 25 mol % —CF 2 —CF(O—CF 3 )—; and about 6 mol % to about 20 mol % —CF 2 —CF(O—CF 2 —CF 2 —O—(CF 2 —O) n —CF 3 )—, where n is 1 or 2.
1 . An elastomeric fluoropolymer comprising the following monomer units:
about 45 mol % to about 65 mol % —CF2-CH2-;
about 8 mol % to about 30 mol % —CF2-CF2-;
about 4.5 mol % to about 25 mol % —CF2-CF(O—CF3)-; and
about 6 mol % to about 20 mol % —CF2-CF(O—CF2-CF2-O—(CF2-O)n-CF3)-,
wherein n is 1 or 2.
2 . The elastomeric fluoropolymer of claim 1 , wherein the elastomeric fluoropolymer is a random tetrapolymer.
3 . The elastomeric fluoropolymer of claim 1 , wherein n is 1.
4 . The elastomeric fluoropolymer of claim 1 , wherein n is 2.
5 . The elastomeric fluoropolymer of claim 1 further comprising iodine or bromine cure sites.
6 . The elastomeric fluoropolymer of claim 5 further comprising iodine or bromine in an amount in the range of about 0.05 wt % to about 0.4 wt %.
7 . The elastomeric fluoropolymer of claim 6 , wherein at least some of the iodine or bromine is bonded to terminal carbon atoms of the elastomeric fluoropolymer.
8 . The elastomeric fluoropolymer of claim 5 , wherein at least some of said iodine or bromine is provided by the elastomeric fluoropolymer further comprising monomer units of iodine-containing or bromine-containing olefin.
9 . The elastomeric fluoropolymer of claim 1 , wherein the elastomeric fluoropolymer has a glass transition temperature of −30° C. or less.
10 . The elastomeric fluoropolymer of claim 1 , wherein after curing, the elastomeric fluoropolymer has a 10% temperature retraction of −30° C. or less.
11 . The elastomeric fluoropolymer of claim 1 , wherein after curing, the elastomeric fluoropolymer has a 70% temperature retraction of −16° C. or less.
12 . The elastomeric fluoropolymer of claim 1 , wherein after curing, the elastomeric fluoropolymer has a temperature retraction difference of less than 14° C.
13 . The elastomeric fluoropolymer of claim 1 , wherein after curing, the elastomeric fluoropolymer has a volume swell of less than 28%.
14 . The elastomeric fluoropolymer of claim 1 , wherein after curing, the elastomeric fluoropolymer has a compression set of less than 50%.
15 . The elastomeric fluoropolymer of claim 1 , wherein the elastomeric fluoropolymer has a Mooney viscosity in the range of about 10 to about 100.
16 . A composition comprising:
an elastomeric fluoropolymer comprising the following monomer units:
about 45 mol % to about 65 mol % —CF2-CH2-;
about 8 mol % to about 30 mol % —CF2-CF2-;
about 4.5 mol % to about 25 mol % —CF2-CF(O—CF3)-; and
about 6 mol % to about 20 mol % —CF2-CF(O—CF2-CF2-O—(CF2-O)n-CF3)-,
wherein n is 1 or 2; and
at least one additive.
17 . The composition of claim 16 , wherein the at least one additive is selected from the group consisting of at least one filler, at least one processing aide, at least one coloring agent, and a combination thereof.
18 . The composition of claim 16 , wherein the at least one additive comprises a peroxide curing agent.
19 . The composition of claim 18 , wherein the peroxide curing agent is selected from the group consisting of an organic peroxide and a polyfunctional unsaturated co-agent.
20 . The composition of claim 16 , wherein the elastomeric fluoropolymer further comprises iodine or bromine cure sites.
21 . A composition comprising:
a first elastomeric fluoropolymer comprising the following monomer units:
about 45 mol % to about 65 mol % —CF2-CH2-;
about 8 mol % to about 30 mol % —CF2-CF2-;
about 4.5 mol % to about 25 mol % —CF2-CF(O—CF3)-; and
about 6 mol % to about 20 mol % —CF2-CF(O—CF2-CF2-O—(CF2-O)n-CF3)-,
wherein n is 1 or 2; and
a second elastomeric fluoropolymer blended with the first elastomeric fluoropolymer.
22 . The composition of claim 21 , wherein the first elastomeric fluoropolymer further comprises iodine or bromine cure sites.
23 . The composition of claim 21 , wherein the second elastomeric fluoropolymer comprises a terpolymer of vinylidene fluoride, tetrafluoroethylene, and perfluoro methyl vinyl ether.
24 . The composition of claim 21 , wherein the first elastomeric fluoropolymer has a glass transition temperature of −30° C. or less.
25 . The composition of claim 21 , wherein the second elastomeric fluoropolymer has a glass transition temperature of greater than about −30° C.
26 . The composition of claim 21 , wherein the first elastomeric fluoropolymer and the second elastomeric fluoropolymer are combined in amounts selected to provide a predetermined glass transition temperature for the composition.
27 . The composition of claim 21 , wherein the composition has a single predetermined glass transition temperature.