Process for preparing organometallic high polymer
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United States of America Patent
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Mar 5, 1991
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N/A
app pub date -
Feb 27, 1990
filing date -
Dec 11, 1987
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Abstract
An improvement in the process for preparing an organometallic polymer having a main chain constituted of silicon and/or germanium or having a main chain constituted of a linkage including carbon and silicon or germanium and further having side chain constituted of organic substituting groups, such as alkyl or aryl group. The improved process comprises the step of dehalogenating an organosilane or organogermane halide in the presence of an alkali metal and a crown ether having 28 or less carbon atoms and 10 or less oxygen atoms, whereby the organosilane or organogermane halide is polymerized by condensation. The crown ether acts as a promotor, and preferable examples used in the process of the invention include 18-crown-6 and 12-crown-4. The molecular weight of the organometallic high polymer prepared by the process of the invention distributes within a relatively narrow range in the neighborhood of about 100,000, resulting in excellent moldability of the polymer. The polymerization step is completed within a short time with good yield. The organometallic polymers prepared by the process of the invention are well suited for use as precursors for silicon carbide, photo-resists, photo-initiators and photosensitive materials for electrophotography.
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