Method of producing polycarbosilane using zeolite as catalyst

Details Method of producing polycarbosilane using zeolite as catalyst Method of producing polycarbosilane using zeolite as catalyst

2007-04-10

2007-04-10

Barts, Samuel (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Silicon containing

Reexamination Certificate

active

10851693

ABSTRACT:
The present invention is related to a method of producing polycarbosilane by heating polydimethylsilane at low pressure within the range of 320˜450° C. using zeolite having the Si/Al or Si/B ratio of 1˜200 as catalyst. This invention uses a zeolite with the structure of ZSM-5, ZSM-11, ZSM-12, zeolite X and zeolite Y, which has the Si/Al or Si/B ratio of 1˜200, as catalyst. When polycarbosilane is produced using a specific zeolite as catalyst, Si/Al or Si/B ratio can be adjusted at any proportion, enabling acidity control of catalyst, and therefore the molecular weight of final products can be easily controlled and the product yield can be improved, compared to conventional solid acid catalysts.

REFERENCES:
patent: 4052430 (1977-10-01), Yajima et al.
patent: 4590253 (1986-05-01), Hasegawa et al.
patent: 62-079228 (1987-04-01), None
Chemical Abstract 2004:28979; Abstract of Characterization of SiC fiber derived from polycarbosilane, Riu, Doh Hyung; Kim, Young Hee; Shin, Dong Geun; Kim, Hyung Rae; Ceramic Transactions (2003), 154(Innovative Processing and Synthesis of Ceramics, Glasses, and Composites VII), 77-86, Sep. 2003.

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