Elastomer seal
AssigneeE. I. Du Pont de Nemours and Company
InventorsFelix V. Martinez, Nabil F. Boufakhreddine
Life of this patent
Estimating the term…
Abstract
Seals capable of containing corrosive liquid and/or vapor of, e.g., HCFCs, are made of cured blends of (a) CTFE/VF.sub.2 elastomer, (b) chlorine-free fluoroelastomer, and (c) 1 to 20 wt % of hydrocarbon polymer, based on the combined weight of (a) and (b). The blends are homogeneous and coherent wherein the hydrocarbon polymer is not visible at 165.times. magnification as a separate phase within the matrix of the blend of (a) and (b) and the blend is free of internal cracks and voids.
Claims19
Seal of cured coherent, homogeneous elastomer blend comprising (a) CTFE/VF.sub.2 elastomer, (b) chlorine-free fluoroelastomer, and (c) a minor proportion with respect to the combined weight of (a) and (b) of hydrocarbon polymer, said hydrocarbon polymer being present in the amount of 1 to 20 wt % based on the combined weight of (a) and (b) and said blend having a volume swell of less than 15% , weight gain of less than 15%, and change of hardness of less than 15, when subjected to the Chemical Process Stimulation Exposure Test.
Curable, coherent, homogeneous blend comprising (a) CTFE/VF.sub.2 polymer curable to elastomer, (b) chlorine-free fluoropolymer curable to elastomer, and (c) a minor proportion of hydrocarbon polymer, said hydrocarbon polymer being present in the amount of 1 to 20 wt % based on the combined weight of (a) and (b) and said blend when cured having a volume swell of less than 15%, weight gain of less than 15%, and change of hardness of less than 15 when subjected to the Chemical Process Stimulation Exposure Test was inserted in each claim.
Process comprising compounding (a) CTFE/VF.sub.2 polymer curable to elastomer, (b) chlorine-free fluoropolymer curable to elastomer, and (c) hydrocarbon polymer to form a coherent, homogeneous blend thereof, said hydrocarbon polymer being present in the amount of 1 to 20 wt % based on the combined weight of (a) and (b) and said blend when cured having a volume swell of less than 15%, weight gain of less than 15%, and change of hardness of less than 15, when subjected to the Chemical Process Stimulation Exposure Test was inserted in each claim.
Dependencies are inferred from the claim text.