The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 10, 2007
Filed:
May. 21, 2004
Hong Sik Park, Gyeongsangnam-do, KR;
Dong Won Lim, Gyeongsangnam-do, KR;
Kwang Soo Kim, Gyeongsangnam-do, KR;
Young Hee Kim, Seoul, KR;
Doh Hyung Riu, Seoul, KR;
Hyung Rae Kim, Gyeonggi-do, KR;
Dong Geun Shin, Gyeonggi-do, KR;
Soo Ryong Kim, Seoul, KR;
Kyung Ja Kim, Gyeonggi-do, KR;
Hyun Kyu Shin, Gyeongsangnam-do, KR;
Dae Hyun Cho, Gyeongsangnam-do, KR;
Hong Sik Park, Gyeongsangnam-do, KR;
Dong Won Lim, Gyeongsangnam-do, KR;
Kwang Soo Kim, Gyeongsangnam-do, KR;
Young Hee Kim, Seoul, KR;
Doh Hyung Riu, Seoul, KR;
Hyung Rae Kim, Gyeonggi-do, KR;
Dong Geun Shin, Gyeonggi-do, KR;
Soo Ryong Kim, Seoul, KR;
Kyung Ja Kim, Gyeonggi-do, KR;
Hyun Kyu Shin, Gyeongsangnam-do, KR;
Dae Hyun Cho, Gyeongsangnam-do, KR;
DACC Co., Ltd., Kyungnam, KR;
Korea Institute of Ceramic Engineering & Technology, Seoul, KR;
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.