Polycarbosilanes containing a hetero element
AssigneeSolvay Deutschland GmbH
InventorsPeter Sartori, Wolfgang Habel, Christopher Nover, Baudouin van Aefferden, Lutz Mayer, Thomas Adrian
Life of this patent
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Abstract
Polycarbosilanes in which some of the silicon atoms have been replaced by a hetero element selected from boron, titanium, zirconium, hafnium, etc. The hetero elements are incorporated into the polycarbosilane skeleton in such a way that, like the silicon atoms, they are bonded to the other parts of the polycarbosilanes via hydrocarbon bridges, and the polycarbosilanes are free of hetero element-oxygen-silicon bonds.
Claims19
A polycarbosilane containing a hetero element and composed of structural units corresponding to the formulas I and II ##STR8## wherein R.sup.1 represents hydrogen, alkyl, cycloalkyl, arylalkyl or aryl, whereby R.sup.1 may have different meanings in various units of the same polycarbosilane;
- R.sup.2 represents alkyl, cycloalkyl, arylalkyl or aryl, whereby R.sup.2 may have different meanings in various units of the same polycarbosilane;
- A represents a straight-chain or branched alkylene group or an arylene group, whereby A may have different meanings in various units of the same polycarbosilane;
- M represents a hetero element having a formal valence m =2, 3, 4 or 5 selected from the group consisting of B, Al, Ga, Ge, Sn, Pb, P, As, Sb, Se, Te, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Ni, Pd and Pt;
- (R.sup.i) represents identical or different groups selected from the group consisting of alkyl, phenyl, cyclopentadienyl and cyclooctadienyl;
- k represents a number 0, 1, 2 or 3;
- and
- represents the number of groups A having the above meaning bonded to the hetero element M in the structural unit of the formula II, and has the value 1, 2, 3 or 4;
- with the proviso that m=k+l+1.
Dependencies are inferred from the claim text.