Low dielectric constant allylics
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsJames R. Griffith, Henry S. W. Hu
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Abstract
A reaction product of a liquid monomeric allyletherfluoroalkylene benzene d a liquid polymethylhydrosiloxane, which reaction product in a cured, solid state has dielectric constant below about 2.5.
Claims13
A network polymer containing the following connecting units:
- ##STR12## where the terminal carbon atom of each connecting unit is bonded to the same benzene ring at positions #1 and #3, wherein position #5 on the benzene ring is substituted with a connecting unit as defined above or a group selected from the group consisting of
- R.sup.2 --O--R.sup.3 -- and R.sup.4 --
- where R.sup.2 is selected from optionally fluorinated hydrocarbon groups of 1-18 carbon atoms and R.sup.3 is selected from the group consisting of straight and branched chain fluorinated alkylene radicals of 1-6 carbon atoms containing 2-12 fluorine atoms and R.sup.4 is selected from fluorinated hydrocarbon groups of 1-18 carbon atoms.
A reaction product of reactant X and reactant Y in presence of a catalyst, wherein reactant X is an allyletherfluoroalkylene benzene and reactant Y is a polyalkylhydrosiloxane;
- said allyletherfluoroalkylene benzene is selected from reactants having the following structure:
- ##STR13## where at least two of the R.sup.5, R.sup.6 and R.sup.7 groups have the following structure:
- CH.sub.2 .dbd.CH--CH.sub.2 --O--R.sup.8 --
- where R.sup.8 is selected from the group consisting of straight and branched chain fluorinated alkylene groups of 1-6 carbon atoms containing 2-12 fluorine atoms, when two of the three groups are the structures noted earlier, the third group is selected from the group consisting of the following structures:
- R.sup.2 --O--R.sup.3 -- and R.sup.4 --
- where R.sup.2 is selected from optionally fluorinated hydrocarbon groups of 1-18 carbon atoms, R.sup.3 is selected from the group consisting of straight and branched chain fluorinated alkylene radicals of 1-6 carbon atoms containing 2-12 fluorine atoms, and R.sup.4 is selected from fluorinated hydrocarbon groups of 1-18 carbon atoms;
- and the polyalkylhydrosiloxane contains the following repeating unit:
- ##STR14## where R.sup.12 is selected from the group consisting of lower alkyl groups containing 1-6 carbon atoms.
A reaction product of reactant X and reactant Y in presence of a catalyst, where reactant X is has the following structure:
- ##STR17## where two of the R.sup.5, R.sup.6 and R.sup.7 groups have the following structure:
- ##STR18## and the third is selected from the group consisting of the following structures:
- R.sup.2 --O--R.sup.3 -- and R.sup.4 --
- where R.sup.2 is selected from the group consisting of fluorinated hydrocarbon groups of 2-6 carbon atoms, R.sup.3 is a straight or branched chain fluorinated alkylene group containing 1-6 carbon atoms and 2-12 fluorine atoms, R.sup.4 is selected from fluorinated hydrocarbon groups of 1-18 carbon atoms, and reactant Y is a polymethylhydrosiloxane.
A reaction product of reactant X and reactant Y prepared in presence of a catalyst containing a metal selected from the group consisting of platinum, palladium, and rhodium, where reactant X is ##STR20## and where reactant Y is ##STR21## wherein n is a value such that the reactant Y is a liquid at room temperature where said reaction product has dielectric constant below about 2.5.
Dependencies are inferred from the claim text.