POLYMETALOXANELEMENTOXANES AND PROCESS FOR PREPARATION THEREOF Russian patent published in 1995 - IPC

FIELD: manufacture of heat resistant fibers. SUBSTANCE: polymetaloxanelementoxanes of the general formula: wherein M′ is AL, Za, Ba, Y, Fe mixtures thereof, M″ is Mg, Ca, Pb, Mn, Si or mixtures thereof, M″′ is Zr, Ce, Ti, Si or mixtures thereof R′ is C₂H₅, C₃H₇, C₄H₉, CH₃OC₂H₄, C₂H₅OC₂H₄, C₄H₉OC₂H₄, R″-C/CH₃/=CHCOOC₂H₅, C/CH₃/=CHCOOC₂H₄OC₄H₉, C/CH₃/=CHCOOC₈H₁₇ or mixtures thereof R″′-CH₃OC₂H₄, C₂H₅OC₂H₄, C₄H₉OC₂H₄, a=0-1; b=0-1; c=0-1; d=0-1; e= 0-1; f=0-1; g=0-1; h=0-1; a+b+c+d is 0-1; e+f+g+h is 0-1; m is or 3; n is 10 1000; p is Σ M″ mole/at wherein M″ is Mg, Ca, Pb, Mn; the b+d+f+h/Σ M′+M″+M″′ ratio is 0.05-1 mole/at prepared by reacting a mixture of at least two compounds selected from the groups consisting of M′(OR′)₃, M″(OR′)₂ and M″(OR′)₄, M″′(OR′)₄, HBO₃ with water at the H₂O/ Σ атM′, M″, M″′ mole ratio of 1 and with a compound of the general formula CH₃C = CHCOOR″ used in an amount of 0,05-1 mole/Σ M′,M″,M″′ in an aliphotic alcoholor alkyl glycol at 40-170 C. EFFECT: improved properties of heat resistant fibers. 3 cl, 4 tbl