| 摘要 |
The invention relates to polytitanic acid esters having linear cross-linking structures, obtainable by reacting a titanium compound that is soluble in an alcohol, in water or in a mixture of water and alcohol and that has the composition (I) Ti(R)mXn(I), wherein the groups R independently mean alkoxy, carboxy, or OH, X means halogen, m=0 to 4, n=0 to 4, and m+n=4, with a compound (II) that contains the following structural unit: [O=CR4-(CR5R3)p-CR1R2-O]-, wherein p is 0 or 1 and wherein (a) R1 and R2 are independently selected from among hydrogen, alkyl and alkenyl, R3 and R5 are independently selected from among hydrogen or an unsubstituted or substituted alkyl or alkenyl, R4 is OH or O(Mx+)1/x, wherein M is a metal or ammonium and x is 1 or 2, or (b) R1 and R2 together mean =O and R3, R5 and R4 are independently selected from among hydrogen, alkyl and alkenyl, wherein the titanium compound (I) is reacted with compound (II) at a molar ratio of 1 to 0.5-1.9, with respect to an unbridged titanium compound, i.e., a (monomeric) titanium compound containing a single titanium atom, with the stipulation that, if compound (I) has no more than 2 hydroxy groups, and if the reaction occurs in a water-free medium, the product formed by the reaction is then brought in contact with water in such a way that a hydrolytic condensation reaction of the produced titanium compound(s) occurs in all cases. Such polytitanic acid esters can be spun in the form of viscous masses to create fibers. |
